20mm Square Window Sill

Availability: In stock

Your Square Window Sills will be dispatched between and (+1 day if choosing our waxed finish option) with free next day delivery.

*NEW* 'Priority' option now available during checkout for faster dispatch.

High quality square edge solid oak window boards in 20mm thickness. Unrivalled in style, price and service, all of our oak window boards are hand selected to ensure you receive the best that money can buy.

  • Arrives machined, sanded, and optionally wax finished
  • Save on costly waste by ordering in 300mm increments
  • We'll optionally trim your window board to your exact size
  • Only the very best, hand selected kiln dried solid oak
including VAT & free delivery
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Technical Specs

Our square edge window boards are a customer favourite, and for good reason. Unbeatable in quality, value for money and optional added extras.

Window Board

0.6-2.4 metres (2-8 feet)
200-300mm, custom orders welcome
Solid Oak
Unfinished, sanded

Optional Extras

Trimmed to Size
Provide us with your exact window sill size and we'll machine and sand your window board to your exact dimensions
Wax Finish
Choose one of our exceptional wax finishes and we'll deliver your window board 'finished' to your spec

Oak Species

American White Oak (Quercus Alba)

Key Features

Our square window boards are precisely machined and sanded with great attention to detail. Ever-popular among our customers, here are a few of the reasons you'll want to buy from us.

We do all of the work for you

Every oak window board we sell arrives machined, sanded, and optionally wax finished. Ready to fit when it arrives.

Only the best quality solid oak

We only use 100% solid oak that demonstrates natural beauty, whilst offering durability and longevity.

Trimmed to size at no cost

As part of our service we'll trim your window board to the exact size that you need, free of charge.

Reduce costly waste

We don't want you having to pay costly oak waste, which is why we offer numerous length and width combinations.


We understand you might have a few questions you'd like answering before ordering. Here we list a few of the most common one's, though you're welcome to contact us should you have something else to ask.

How much does P&P cost?

Every oak window board in our range includes VAT and free delivery. We don't like to surprise you with hidden costs during checkout, so the price you see is the price you pay.

I need my window board cutting to a specific size.

That's fine. We offer this service free of charge. Just select the window board the next size up to what you need and enter the dimensions in the 'Trimmed to size' box.

Will my window board be sanded?

We sand every item we send out as standard. Your window board will arrive smooth and ready to be treated, or we'll optionally wax your window board for you.

Customer Reviews

All of our reviews are by 100% verified customers.

Based on 8 reviews Write a review

Customer Reviews

Based on 35 reviews
Nigel Ryland (Blackpool)
Great Quality

Exactly as described nice piece of timber

Thank you Nigel, I'm glad you like the oak :)

Andrea Apuzzo (Rossendale)
Perfect fit!!!

Great cut to size service! The board arrived on time and it fit perfectly! Strongly recommended!

Thank you for the great review for your window board Andrea, I'm really glad I could help :)

julian Greep (Plymouth)
Oak cill board

Nice product sensible price

Thanks Julian, we aim to please!

Lee Garland (Nottingham)
Great service, friendly, excellent price, superb finish to the wood

We were very happy with our oak window sills which were cut to size, beautifully finished, well packaged and delivered with a great courier. We spoke to Essential Woodwork as well as ordering online and the whole process was very friendly and easy.

That’s great, thanks Lee. Really good to know that you’re pleased with your oak window boards and we were able to help. You know where we are should you ever need anything else.

Cheryl R (Norwich)
20mm square oak window sill

Quality piece. Had cut to size and it fits perfectly. Excellent packaging.
Would use this company again.

Thank you Cheryl. Always good to know when our cut to size window boards fit like they should! Thanks for the review.

Lisa Wilson (Basildon)
Quick delivery good quality

Great service when quick delivery was requested

Thank you Lisa, I’m glad we could help :)

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