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.
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 18 reviews
Great service and product!

We were amazed at how thoroughly packaged our sill was. It arrived in perfect condition and looks amazing. Thanks!

Excellent! I'm pleased that you're happy with the sill and with our service :)
Very impressed!

Really good quality products, service, very decent prices and a nice, user friendly online shop. Absolutely will use again soon...

Thanks Steve, that's great to hear. I'm really pleased that you had a good experience shopping with us and look forward to you hopefully returning soon!
Oak window board

Had looked every where to get an oak window board to match oak vanity unit in the bathroom. Luckily essential woodwork had just the thing

Thanks Alan. Glad we could be of use, and good to hear that the window board was just what you were after. Let us know should you ever need anything else.
Quality piece of wood

Great looking piece of wood, even better when varnished.

Thanks for the feedback Mick. Glad that you're pleased with your oak sill.
Oak window sill

Quality timber at a good price with a fast efficient service
Would definitely use company again

Thank you Steve. Great to hear that you're pleased with your Oak. Hope to see you return soon!

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