25mm 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 window sills machined using only the finest Oak and delivered to your door directly from our UK workshop.

  • Seasoned oak timber to ensure you're buying the best
  • We can trim your sills to a more precise width/length if you need
  • We'll sand your sill after machining to ensure perfection
  • Order lengths in increments of 0.3m to save on costly wood waste
including VAT & free delivery
Shopify secure badge

Technical Specs

Read all about the specifications of our square edge window boards, including available finishes, sizes and optional extras.

Window Board

0.6-2.4 metres (2-8 feet)
200-300mm, wider on request
Solid Oak
Unfinished, sanded

Optional Extras

Cut to Size
Our oak window boards can be trimmed to your exact dimensions free of charge
Wax Finish
Choose one of our wax finishes and we'll provide your window board 'finished' to your specification

Oak Species

American White Oak (Quercus Alba)

Key Features

We pride ourselves on machining and supplying some of the best oak window sills that money can buy. Here are a few of the features that make your buying decision a whole lot easier.

Solid kiln dried oak

No veneers or MDF here! We only use high quality kiln dried solid oak for our window boards, offering a beautiful finish and durable sill.

Trim to size option

If you want to fit your oak window board as soon as it arrives, we can trim to the exact length and width that you tell us to when ordering.

All of the hard work done

In addition to optionally trimming your window boards to size, we'll machine and sand every piece to ensure an excellent overall finish.

No costly wood waste

Using our ordering options, you're able to choose a window board that most suits your size requirements, from 0.3m length and 25mm width increments.


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.

Do these sills need sanding?

We do that for you. After machining, we sand all of our window boards to ensure a perfect finish.

Would you trim the sills to size for me?

Yes. Simply select the next size option up to what you need and in the 'Trimmed to size' section of the ordering form add your dimensions.

What does delivery cost?

All of the prices you see on our website include free delivery. We like to make it easy so there aren't any unexpected costs sprung on you during checkout.

Customer Reviews

All of our reviews are by 100% verified customers.

Based on 4 reviews Write a review

Customer Reviews

Based on 25 reviews
Fabulous oak sills 225 x 25 mm - approx 11 m order in 7 various lengths

Best value oak boards around. Quality graded oak. Perfectly finished - hardly any finishing required - just a light 120 grit sand over. Perfectly machined straight and true. No imperfections. No knots or splits. Nice tight grain. Absolutely superb product and service. Perfectly wrapped for safe delivery.

Thanks for the great review Nigel! Always good to hear from satisfied customers, especially when seeing the window boards fitted in your photo. They look fantastic and I'm glad we were able to provide exactly what you were after.
Great quality

Arrived as expected and beautiful quality

Thank you Elena :)
Lovely solid oak window board

Love my new window board after decorating my hallway. I will be replacing them all eventually! Just bought another one! 4* due to longer lead times than other places.

Thanks for the feedback Anthony. As we machine to order all of our oak window boards due to catering to custom sizes we may have a slightly longer lead time than others who just buy in ready machined boards to resell. However, we have also now introduced a 'priority order' service for those that need their items faster. Hopefully this helps if you ever need it :)
Great Service

Very competitive price for a perfect oak window sill, delivered on time, in a comprehensive protective wrapping. Great service throughout.

Thank you Rob. I'm glad you're happy with the oak sill and service we offer. Hopefully see you return sometime soon.
25mm Bullnose Oak Sill

This is the second sill I've ordered from Essential Woodwork, extremely satisfied.

It's always great to see customers returning and I'm glad that you're happy with the window boards. Hopefully see you again sometime :)

You Might Also Like