Bespoke Solid Oak Window Sills – Premium Joinery Grade Oak, Made to Measure
Handcrafted solid oak window sills made to measure in our Pembrokeshire workshop and delivered nationwide across the UK.
Why Choose Our Oak Sills
- ✔ Solid European oak
- ✔ Made to your exact size
- ✔ Choice of live edge or square edge
- ✔ Handmade with love
Solid Oak Window Sills & Boards - Made to Measure
Bespoke solid oak window sills, handcrafted from kiln-dried French oak and cut precisely to your measurements.
Each sill is machined in-house from kiln-dried, joinery-grade European oak and planed and sanded to a smooth, furniture-quality finish. Whether you’re renovating a period property or adding warmth to a modern interior, our bespoke oak window boards add depth, character and natural beauty to any room.
Made to Measure - Cut to the Millimeter
Every oak board is cut precisely to your required dimensions
We manufacture bespoke sizes to fit any alcove, recess or wall opening. Simply enter your measurements when ordering and we’ll produce your sill to the exact millimetre.
For wider boards (typically over 150mm), sections may be professionally joined to achieve the required depth. This is carefully matched to maintain a natural grain flow and seamless appearance.
Premium Kiln Dried French Oak
We use thick, kiln-dried French oak to ensure quality, stability and longevity.
✔ Joinery grade timber
✔ Planed and sanded to a fine finish
✔ Suitable for oiling, staining or waxing
✔ Solid oak – not veneered or MDF wrapped
As oak is a natural product, each board will have unique grain patterns, knots and tonal variation — part of what makes every piece individual.
Solid Oak Window Sills & Boards - Made to Measure
Bespoke solid oak window sills, handcrafted from kiln-dried French oak and cut precisely to your measurements.
Each sill is machined in-house from kiln-dried, joinery-grade European oak and planed and sanded to a smooth, furniture-quality finish. Whether you’re renovating a period property or adding warmth to a modern interior, our bespoke oak window boards add depth, character and natural beauty to any room.
Made to Measure - Cut to the Millimeter
Every oak board is cut precisely to your required dimensions
We manufacture bespoke sizes to fit any alcove, recess or wall opening. Simply enter your measurements when ordering and we’ll produce your sill to the exact millimetre.
For wider boards (typically over 150mm), sections may be professionally joined to achieve the required depth. This is carefully matched to maintain a natural grain flow and seamless appearance.
Premium Kiln Dried French Oak
We use thick, kiln-dried French oak to ensure quality, stability and longevity.
✔ Joinery grade timber
✔ Planed and sanded to a fine finish
✔ Suitable for oiling, staining or waxing
✔ Solid oak – not veneered or MDF wrapped
As oak is a natural product, each board will have unique grain patterns, knots and tonal variation — part of what makes every piece individual.
Our solid oak sills are available with two edge styles so you can choose the look that best suits your space.
Square Edge
A clean, straight edge with a modern and refined appearance.
This option works well in contemporary kitchens, modern interiors and minimalist spaces where a crisp, uniform finish is preferred.
Live Edge
A natural “waney” edge that follows the original shape of the tree.
This keeps the organic character of the oak and creates a more rustic, unique look, ideal for farmhouse kitchens, cottages and character homes.
Because live edge shelves follow the natural grain of the timber, each shelf will have its own individual shape and character.
Both edge styles are carefully sanded and prepared so they are smooth to the touch and ready for finishing or installation.
Our solid oak sills are available with two edge styles so you can choose the look that best suits your space.
Square Edge
A clean, straight edge with a modern and refined appearance.
This option works well in contemporary kitchens, modern interiors and minimalist spaces where a crisp, uniform finish is preferred.
Live Edge
A natural “waney” edge that follows the original shape of the tree.
This keeps the organic character of the oak and creates a more rustic, unique look, ideal for farmhouse kitchens, cottages and character homes.
Because live edge shelves follow the natural grain of the timber, each shelf will have its own individual shape and character.
Both edge styles are carefully sanded and prepared so they are smooth to the touch and ready for finishing or installation.
Sill Thickness Guide
Our solid oak shelves are available in a range of thicknesses, allowing you to choose the style and visual weight that best suits your space.
26mm – Slim & Minimal
A clean, lighter sill profile that works well in modern interiors, bathrooms, or spaces where a subtle look is preferred.
33mm – Most Popular
Our most commonly chosen thickness.
It provides a balanced, substantial appearance that works perfectly in kitchens, bedrooms and living rooms.
42mm – Chunky & Characterful
A thicker sill with a stronger visual presence.
Ideal for rustic interiors, statement windows, or where a more traditional solid oak look is desired.
55mm – Extra Chunky Statement Sill
Our thickest option, creating a bold and substantial sill that becomes a real feature within the room.
Perfect for larger rooms and windows, bay windows, window seats etc
All sill are made from solid kiln-dried Europen oak, carefully planed and sanded to create a smooth, premium finish.
Sill Thickness Guide
Our solid oak shelves are available in a range of thicknesses, allowing you to choose the style and visual weight that best suits your space.
26mm – Slim & Minimal
A clean, lighter sill profile that works well in modern interiors, bathrooms, or spaces where a subtle look is preferred.
33mm – Most Popular
Our most commonly chosen thickness.
It provides a balanced, substantial appearance that works perfectly in kitchens, bedrooms and living rooms.
42mm – Chunky & Characterful
A thicker sill with a stronger visual presence.
Ideal for rustic interiors, statement windows, or where a more traditional solid oak look is desired.
55mm – Extra Chunky Statement Sill
Our thickest option, creating a bold and substantial sill that becomes a real feature within the room.
Perfect for larger rooms and windows, bay windows, window seats etc
All sill are made from solid kiln-dried Europen oak, carefully planed and sanded to create a smooth, premium finish.
Delivery & Lead Time
Current lead time: Approximately 2–3 weeks
We ship Nationwide across the UK using trusted courier networks, delivery is only available on weekdays.
Delivery & Lead Time
Current lead time: Approximately 2–3 weeks
We ship Nationwide across the UK using trusted courier networks, delivery is only available on weekdays.
Installation Guidance
Solid oak is a natural, structural timber and should be installed correctly to ensure long-term stability and performance.
Acclimatisation
Before installation, we recommend allowing your oak window sill to acclimatise in the room where it will be fitted for several days. This allows the timber to adjust to the ambient temperature and humidity levels.
- Store flat
- Keep away from direct heat sources
- Do not lean upright against a wall
Supporting the Weight
Oak window sills are solid and heavy. Proper support is essential.
- Ensure the sill is fully supported across its width
- Use appropriate brackets or battens where required
- Avoid leaving large unsupported spans
For installations above radiators, allow airflow to prevent excessive heat build-up beneath the timber.
Fixing Advice
- Secure using suitable fixings into masonry or framing
- Avoid over-tightening screws
- Always allow for natural expansion and contraction
We recommend fixing the sill close to the delivery date to minimise movement prior to installation.
If you are unsure, consult a qualified carpenter or joiner.If you are unsure, consult a qualified carpenter or joiner.
Installation Guidance
Solid oak is a natural, structural timber and should be installed correctly to ensure long-term stability and performance.
Acclimatisation
Before installation, we recommend allowing your oak window sill to acclimatise in the room where it will be fitted for several days. This allows the timber to adjust to the ambient temperature and humidity levels.
- Store flat
- Keep away from direct heat sources
- Do not lean upright against a wall
Supporting the Weight
Oak window sills are solid and heavy. Proper support is essential.
- Ensure the sill is fully supported across its width
- Use appropriate brackets or battens where required
- Avoid leaving large unsupported spans
For installations above radiators, allow airflow to prevent excessive heat build-up beneath the timber.
Fixing Advice
- Secure using suitable fixings into masonry or framing
- Avoid over-tightening screws
- Always allow for natural expansion and contraction
We recommend fixing the sill close to the delivery date to minimise movement prior to installation.
If you are unsure, consult a qualified carpenter or joiner.If you are unsure, consult a qualified carpenter or joiner.
Timber Variation & Natural Characteristics
Oak is a natural material, and every board is unique. No two window sills will ever look identical — and that’s part of the beauty.
Colour variation
Solid oak can vary in tone from light golden hues to deeper honey shades. Over time, exposure to light will naturally mellow and deepen the colour. This is not a defect — it is a natural characteristic of genuine solid oak.
Grain and knots
You may see natural knots, grain variation, small checks or character markings, and subtle colour shifts. These features add authenticity and character to your window sill.
Joined boards (for wider widths)
For widths generally over 150mm+, boards may be professionally joined to achieve the required depth. This is done to prevent movement / cupping within the board. We carefully match grain and tone to ensure a seamless, natural appearance. All joints are structurally secure and finished to the same high standard.
Natural movement
As a natural timber product, oak may expand or contract slightly depending on environmental conditions. Correct installation and acclimatisation will minimise movement.
Timber Variation & Natural Characteristics
Oak is a natural material, and every board is unique. No two window sills will ever look identical — and that’s part of the beauty.
Colour variation
Solid oak can vary in tone from light golden hues to deeper honey shades. Over time, exposure to light will naturally mellow and deepen the colour. This is not a defect — it is a natural characteristic of genuine solid oak.
Grain and knots
You may see natural knots, grain variation, small checks or character markings, and subtle colour shifts. These features add authenticity and character to your window sill.
Joined boards (for wider widths)
For widths generally over 150mm+, boards may be professionally joined to achieve the required depth. This is done to prevent movement / cupping within the board. We carefully match grain and tone to ensure a seamless, natural appearance. All joints are structurally secure and finished to the same high standard.
Natural movement
As a natural timber product, oak may expand or contract slightly depending on environmental conditions. Correct installation and acclimatisation will minimise movement.
Frequently Asked Questions
Are your window sills solid oak?
Yes. All of our window sills are manufactured from solid kiln-dried European oak. We do not use veneer or MDF-wrapped products.
Can you make them to my exact size?
Yes. Every window sill is cut precisely to the millimetre to match your measurements.
What thickness should I choose?
This depends on the look you want and the size of the opening. Thicker boards provide a more substantial, architectural feel and are ideal for larger windows.
Can I install an oak window sill / shelf above a radiator?
Yes, provided adequate airflow is maintained and the sill is properly supported. Oak is durable, but excessive heat build-up should be avoided.
Do the boards come pre-finished?
Boards are supplied planed and sanded to a fine finish, ready for oiling, staining or sealing to suit your interior.
How long is the lead time?
Current lead time is approximately 2–3 weeks from order completion.
Will my board look exactly like the photos?
Each board is unique due to natural grain and colour variation. While the quality and finish are consistent, no two pieces will be identical.
Frequently Asked Questions
Are your window sills solid oak?
Yes. All of our window sills are manufactured from solid kiln-dried European oak. We do not use veneer or MDF-wrapped products.
Can you make them to my exact size?
Yes. Every window sill is cut precisely to the millimetre to match your measurements.
What thickness should I choose?
This depends on the look you want and the size of the opening. Thicker boards provide a more substantial, architectural feel and are ideal for larger windows.
Can I install an oak window sill / shelf above a radiator?
Yes, provided adequate airflow is maintained and the sill is properly supported. Oak is durable, but excessive heat build-up should be avoided.
Do the boards come pre-finished?
Boards are supplied planed and sanded to a fine finish, ready for oiling, staining or sealing to suit your interior.
How long is the lead time?
Current lead time is approximately 2–3 weeks from order completion.
Will my board look exactly like the photos?
Each board is unique due to natural grain and colour variation. While the quality and finish are consistent, no two pieces will be identical.
At Celtic Timber, sustainability is at the heart of everything we do. We source our timber from sustainably sourced certified forests, ensuring responsible management and protection of natural resources.
We also actively contribute to reforestation and rewilding projects across the UK, planting over 12,000 trees on our own land. By choosing our products, you’re supporting a company dedicated to reducing environmental impact and preserving the planet for future generations.
At Celtic Timber, sustainability is at the heart of everything we do. We source our timber from sustainably sourced certified forests, ensuring responsible management and protection of natural resources.
We also actively contribute to reforestation and rewilding projects across the UK, planting over 12,000 trees on our own land. By choosing our products, you’re supporting a company dedicated to reducing environmental impact and preserving the planet for future generations.
Returns & Peace of Mind
We stand by the quality of our products and want you to order with confidence.
We offer a 30-day returns policy on all non-bespoke items. If for any reason you’re not completely satisfied, please contact us within 30 days of receiving your order and we’ll be happy to assist.
If your item arrives damaged or incorrect, let us know as soon as possible and we’ll arrange a replacement or agree an appropriate resolution quickly and fairly.
To qualify for a refund, items must be returned unused and in their original packaging.
Return shipping costs are the responsibility of the customer, except where the return is due to damage in transit or an error on our part.
For bespoke or made-to-measure items, please note that these are manufactured specifically to your dimensions and are therefore non-returnable unless faulty.
Returns & Peace of Mind
We stand by the quality of our products and want you to order with confidence.
We offer a 30-day returns policy on all non-bespoke items. If for any reason you’re not completely satisfied, please contact us within 30 days of receiving your order and we’ll be happy to assist.
If your item arrives damaged or incorrect, let us know as soon as possible and we’ll arrange a replacement or agree an appropriate resolution quickly and fairly.
To qualify for a refund, items must be returned unused and in their original packaging.
Return shipping costs are the responsibility of the customer, except where the return is due to damage in transit or an error on our part.
For bespoke or made-to-measure items, please note that these are manufactured specifically to your dimensions and are therefore non-returnable unless faulty.
Bespoke Solid Oak Window Sills – Premium Joinery Grade Oak, Made to Measure
Why Choose Our Oak Sills
- ✔ Solid European oak
- ✔ Made to your exact size
- ✔ Choice of live edge or square edge
- ✔ Handmade with love
Solid Oak Window Sills & Boards - Made to Measure
Bespoke solid oak window sills, handcrafted from kiln-dried French oak and cut precisely to your measurements.
Each sill is machined in-house from kiln-dried, joinery-grade European oak and planed and sanded to a smooth, furniture-quality finish. Whether you’re renovating a period property or adding warmth to a modern interior, our bespoke oak window boards add depth, character and natural beauty to any room.
Made to Measure - Cut to the Millimeter
Every oak board is cut precisely to your required dimensions
We manufacture bespoke sizes to fit any alcove, recess or wall opening. Simply enter your measurements when ordering and we’ll produce your sill to the exact millimetre.
For wider boards (typically over 150mm), sections may be professionally joined to achieve the required depth. This is carefully matched to maintain a natural grain flow and seamless appearance.
Premium Kiln Dried French Oak
We use thick, kiln-dried French oak to ensure quality, stability and longevity.
✔ Joinery grade timber
✔ Planed and sanded to a fine finish
✔ Suitable for oiling, staining or waxing
✔ Solid oak – not veneered or MDF wrapped
As oak is a natural product, each board will have unique grain patterns, knots and tonal variation — part of what makes every piece individual.
Solid Oak Window Sills & Boards - Made to Measure
Bespoke solid oak window sills, handcrafted from kiln-dried French oak and cut precisely to your measurements.
Each sill is machined in-house from kiln-dried, joinery-grade European oak and planed and sanded to a smooth, furniture-quality finish. Whether you’re renovating a period property or adding warmth to a modern interior, our bespoke oak window boards add depth, character and natural beauty to any room.
Made to Measure - Cut to the Millimeter
Every oak board is cut precisely to your required dimensions
We manufacture bespoke sizes to fit any alcove, recess or wall opening. Simply enter your measurements when ordering and we’ll produce your sill to the exact millimetre.
For wider boards (typically over 150mm), sections may be professionally joined to achieve the required depth. This is carefully matched to maintain a natural grain flow and seamless appearance.
Premium Kiln Dried French Oak
We use thick, kiln-dried French oak to ensure quality, stability and longevity.
✔ Joinery grade timber
✔ Planed and sanded to a fine finish
✔ Suitable for oiling, staining or waxing
✔ Solid oak – not veneered or MDF wrapped
As oak is a natural product, each board will have unique grain patterns, knots and tonal variation — part of what makes every piece individual.
Our solid oak sills are available with two edge styles so you can choose the look that best suits your space.
Square Edge
A clean, straight edge with a modern and refined appearance.
This option works well in contemporary kitchens, modern interiors and minimalist spaces where a crisp, uniform finish is preferred.
Live Edge
A natural “waney” edge that follows the original shape of the tree.
This keeps the organic character of the oak and creates a more rustic, unique look, ideal for farmhouse kitchens, cottages and character homes.
Because live edge shelves follow the natural grain of the timber, each shelf will have its own individual shape and character.
Both edge styles are carefully sanded and prepared so they are smooth to the touch and ready for finishing or installation.
Our solid oak sills are available with two edge styles so you can choose the look that best suits your space.
Square Edge
A clean, straight edge with a modern and refined appearance.
This option works well in contemporary kitchens, modern interiors and minimalist spaces where a crisp, uniform finish is preferred.
Live Edge
A natural “waney” edge that follows the original shape of the tree.
This keeps the organic character of the oak and creates a more rustic, unique look, ideal for farmhouse kitchens, cottages and character homes.
Because live edge shelves follow the natural grain of the timber, each shelf will have its own individual shape and character.
Both edge styles are carefully sanded and prepared so they are smooth to the touch and ready for finishing or installation.
Sill Thickness Guide
Our solid oak shelves are available in a range of thicknesses, allowing you to choose the style and visual weight that best suits your space.
26mm – Slim & Minimal
A clean, lighter sill profile that works well in modern interiors, bathrooms, or spaces where a subtle look is preferred.
33mm – Most Popular
Our most commonly chosen thickness.
It provides a balanced, substantial appearance that works perfectly in kitchens, bedrooms and living rooms.
42mm – Chunky & Characterful
A thicker sill with a stronger visual presence.
Ideal for rustic interiors, statement windows, or where a more traditional solid oak look is desired.
55mm – Extra Chunky Statement Sill
Our thickest option, creating a bold and substantial sill that becomes a real feature within the room.
Perfect for larger rooms and windows, bay windows, window seats etc
All sill are made from solid kiln-dried Europen oak, carefully planed and sanded to create a smooth, premium finish.
Sill Thickness Guide
Our solid oak shelves are available in a range of thicknesses, allowing you to choose the style and visual weight that best suits your space.
26mm – Slim & Minimal
A clean, lighter sill profile that works well in modern interiors, bathrooms, or spaces where a subtle look is preferred.
33mm – Most Popular
Our most commonly chosen thickness.
It provides a balanced, substantial appearance that works perfectly in kitchens, bedrooms and living rooms.
42mm – Chunky & Characterful
A thicker sill with a stronger visual presence.
Ideal for rustic interiors, statement windows, or where a more traditional solid oak look is desired.
55mm – Extra Chunky Statement Sill
Our thickest option, creating a bold and substantial sill that becomes a real feature within the room.
Perfect for larger rooms and windows, bay windows, window seats etc
All sill are made from solid kiln-dried Europen oak, carefully planed and sanded to create a smooth, premium finish.
Delivery & Lead Time
Current lead time: Approximately 2–3 weeks
We ship Nationwide across the UK using trusted courier networks, delivery is only available on weekdays.
Delivery & Lead Time
Current lead time: Approximately 2–3 weeks
We ship Nationwide across the UK using trusted courier networks, delivery is only available on weekdays.
Installation Guidance
Solid oak is a natural, structural timber and should be installed correctly to ensure long-term stability and performance.
Acclimatisation
Before installation, we recommend allowing your oak window sill to acclimatise in the room where it will be fitted for several days. This allows the timber to adjust to the ambient temperature and humidity levels.
- Store flat
- Keep away from direct heat sources
- Do not lean upright against a wall
Supporting the Weight
Oak window sills are solid and heavy. Proper support is essential.
- Ensure the sill is fully supported across its width
- Use appropriate brackets or battens where required
- Avoid leaving large unsupported spans
For installations above radiators, allow airflow to prevent excessive heat build-up beneath the timber.
Fixing Advice
- Secure using suitable fixings into masonry or framing
- Avoid over-tightening screws
- Always allow for natural expansion and contraction
We recommend fixing the sill close to the delivery date to minimise movement prior to installation.
If you are unsure, consult a qualified carpenter or joiner.If you are unsure, consult a qualified carpenter or joiner.
Installation Guidance
Solid oak is a natural, structural timber and should be installed correctly to ensure long-term stability and performance.
Acclimatisation
Before installation, we recommend allowing your oak window sill to acclimatise in the room where it will be fitted for several days. This allows the timber to adjust to the ambient temperature and humidity levels.
- Store flat
- Keep away from direct heat sources
- Do not lean upright against a wall
Supporting the Weight
Oak window sills are solid and heavy. Proper support is essential.
- Ensure the sill is fully supported across its width
- Use appropriate brackets or battens where required
- Avoid leaving large unsupported spans
For installations above radiators, allow airflow to prevent excessive heat build-up beneath the timber.
Fixing Advice
- Secure using suitable fixings into masonry or framing
- Avoid over-tightening screws
- Always allow for natural expansion and contraction
We recommend fixing the sill close to the delivery date to minimise movement prior to installation.
If you are unsure, consult a qualified carpenter or joiner.If you are unsure, consult a qualified carpenter or joiner.
Timber Variation & Natural Characteristics
Oak is a natural material, and every board is unique. No two window sills will ever look identical — and that’s part of the beauty.
Colour variation
Solid oak can vary in tone from light golden hues to deeper honey shades. Over time, exposure to light will naturally mellow and deepen the colour. This is not a defect — it is a natural characteristic of genuine solid oak.
Grain and knots
You may see natural knots, grain variation, small checks or character markings, and subtle colour shifts. These features add authenticity and character to your window sill.
Joined boards (for wider widths)
For widths generally over 150mm+, boards may be professionally joined to achieve the required depth. This is done to prevent movement / cupping within the board. We carefully match grain and tone to ensure a seamless, natural appearance. All joints are structurally secure and finished to the same high standard.
Natural movement
As a natural timber product, oak may expand or contract slightly depending on environmental conditions. Correct installation and acclimatisation will minimise movement.
Timber Variation & Natural Characteristics
Oak is a natural material, and every board is unique. No two window sills will ever look identical — and that’s part of the beauty.
Colour variation
Solid oak can vary in tone from light golden hues to deeper honey shades. Over time, exposure to light will naturally mellow and deepen the colour. This is not a defect — it is a natural characteristic of genuine solid oak.
Grain and knots
You may see natural knots, grain variation, small checks or character markings, and subtle colour shifts. These features add authenticity and character to your window sill.
Joined boards (for wider widths)
For widths generally over 150mm+, boards may be professionally joined to achieve the required depth. This is done to prevent movement / cupping within the board. We carefully match grain and tone to ensure a seamless, natural appearance. All joints are structurally secure and finished to the same high standard.
Natural movement
As a natural timber product, oak may expand or contract slightly depending on environmental conditions. Correct installation and acclimatisation will minimise movement.
Frequently Asked Questions
Are your window sills solid oak?
Yes. All of our window sills are manufactured from solid kiln-dried European oak. We do not use veneer or MDF-wrapped products.
Can you make them to my exact size?
Yes. Every window sill is cut precisely to the millimetre to match your measurements.
What thickness should I choose?
This depends on the look you want and the size of the opening. Thicker boards provide a more substantial, architectural feel and are ideal for larger windows.
Can I install an oak window sill / shelf above a radiator?
Yes, provided adequate airflow is maintained and the sill is properly supported. Oak is durable, but excessive heat build-up should be avoided.
Do the boards come pre-finished?
Boards are supplied planed and sanded to a fine finish, ready for oiling, staining or sealing to suit your interior.
How long is the lead time?
Current lead time is approximately 2–3 weeks from order completion.
Will my board look exactly like the photos?
Each board is unique due to natural grain and colour variation. While the quality and finish are consistent, no two pieces will be identical.
Frequently Asked Questions
Are your window sills solid oak?
Yes. All of our window sills are manufactured from solid kiln-dried European oak. We do not use veneer or MDF-wrapped products.
Can you make them to my exact size?
Yes. Every window sill is cut precisely to the millimetre to match your measurements.
What thickness should I choose?
This depends on the look you want and the size of the opening. Thicker boards provide a more substantial, architectural feel and are ideal for larger windows.
Can I install an oak window sill / shelf above a radiator?
Yes, provided adequate airflow is maintained and the sill is properly supported. Oak is durable, but excessive heat build-up should be avoided.
Do the boards come pre-finished?
Boards are supplied planed and sanded to a fine finish, ready for oiling, staining or sealing to suit your interior.
How long is the lead time?
Current lead time is approximately 2–3 weeks from order completion.
Will my board look exactly like the photos?
Each board is unique due to natural grain and colour variation. While the quality and finish are consistent, no two pieces will be identical.
At Celtic Timber, sustainability is at the heart of everything we do. We source our timber from sustainably sourced certified forests, ensuring responsible management and protection of natural resources.
We also actively contribute to reforestation and rewilding projects across the UK, planting over 12,000 trees on our own land. By choosing our products, you’re supporting a company dedicated to reducing environmental impact and preserving the planet for future generations.
At Celtic Timber, sustainability is at the heart of everything we do. We source our timber from sustainably sourced certified forests, ensuring responsible management and protection of natural resources.
We also actively contribute to reforestation and rewilding projects across the UK, planting over 12,000 trees on our own land. By choosing our products, you’re supporting a company dedicated to reducing environmental impact and preserving the planet for future generations.
Returns & Peace of Mind
We stand by the quality of our products and want you to order with confidence.
We offer a 30-day returns policy on all non-bespoke items. If for any reason you’re not completely satisfied, please contact us within 30 days of receiving your order and we’ll be happy to assist.
If your item arrives damaged or incorrect, let us know as soon as possible and we’ll arrange a replacement or agree an appropriate resolution quickly and fairly.
To qualify for a refund, items must be returned unused and in their original packaging.
Return shipping costs are the responsibility of the customer, except where the return is due to damage in transit or an error on our part.
For bespoke or made-to-measure items, please note that these are manufactured specifically to your dimensions and are therefore non-returnable unless faulty.
Returns & Peace of Mind
We stand by the quality of our products and want you to order with confidence.
We offer a 30-day returns policy on all non-bespoke items. If for any reason you’re not completely satisfied, please contact us within 30 days of receiving your order and we’ll be happy to assist.
If your item arrives damaged or incorrect, let us know as soon as possible and we’ll arrange a replacement or agree an appropriate resolution quickly and fairly.
To qualify for a refund, items must be returned unused and in their original packaging.
Return shipping costs are the responsibility of the customer, except where the return is due to damage in transit or an error on our part.
For bespoke or made-to-measure items, please note that these are manufactured specifically to your dimensions and are therefore non-returnable unless faulty.
SOLID EUROPEAN OAK
Air-dried solid European oak, carefully selected for beautiful natural grain and character. No veneers or laminates — just genuine oak that will last for generations.
HANDCRAFTED IN PEMBROKESHIRE
Each beam is individually machined, sanded and finished in our Pembrokeshire workshop by experienced craftsmen to ensure a clean, premium finish ready for installation.
READY TO INSTALL
Every beam includes the hidden fixing brackets and protective oil finish. Designed for straightforward installation with everything you need supplied.
Bespoke Solid Oak Window Sills – Crafted to Your Exact Size
Our bespoke solid oak window sills are crafted from premium kiln-dried European oak and made to measure for your project. Whether you're renovating a traditional property, installing new windows or completing a modern interior, a genuine solid oak window sill adds warmth, strength and timeless character.
Unlike mass-produced alternatives, each sill is cut precisely to your required dimensions, giving you complete flexibility for depth, length and thickness. The result is a perfectly fitted oak sill that enhances both the appearance and durability of your window space.
For over 20 years Celtic Timber has specialised in bespoke oak joinery, supplying solid oak beams, shelves, mantels and window sills to homeowners, tradespeople and businesses across the UK. Our experience, attention to detail and high-quality timber have made us one of the most trusted oak suppliers in the country.
All of our oak window sills are carefully machined and finished in our Pembrokeshire workshop, with optional oil finishes available to enhance the natural oak grain while protecting the timber for years to come.
Looking for something bespoke?
Bring your ideas to life - Head over to our bespoke order page
