Standard sill
A straight board that sits on the opening and butts up to the reveal on either side. The simpler piece, and the right one for a modern opening with clean, square returns.
Stone window sills cut to measure for kitchens and bathrooms
- 5.0 from 26 Google reviews
- 25-year material · 5-year workmanship
- Fitted 5-10 working days from template
Stone window sills cut to measure in quartz, granite, Dekton or other sintered stone: internal sills for kitchens, bathrooms and living rooms, standard or notched into the reveal, templated on site and fitted by our own team across London. Ordered with the worktop, a sill comes off the same slab run, and often out of the offcut. Stone is supplied from £110/m² (stone only); a sill is priced as a piece on the quote.
The smallest piece of stone in the room, and the one you look at most
A window sill sits at eye level, in the best light in the room, a few centimetres above the worktop. That is why a sill added as an afterthought so often disappoints: a different batch, a second visit, and a shade that does not quite agree with the stone beneath it.
Decided at the right time it is one of the simplest pieces we make. It is templated in the same visit as the worktop, drawn onto the same cutting layout, and very often cut from stone you have already paid for, because the offcut left after a kitchen is nested onto a slab is usually big enough for a sill.
It is also the most practical place in a kitchen or bathroom for stone. A sill over a sink is splashed from below and wet with condensation from the glass above, and every stone we cut copes with standing water far better than a painted timber board.
Fitted 5–10 working days from template. The payment stages are set out on your quote.
- Where
- Internal sills: kitchen, bathroom, any room
- Fit
- Standard, or notched into the reveal
- Thickness
- The worktop thickness, usually
- Priced
- As a piece on the quote
Which sill
Standard, notched, over the sink and in the bathroom
The same stone in each case. What changes is how the sill meets the window opening, and what it has around it.
Notched sill
Scribed into the reveal, so it sits inside the opening rather than butting up to it. The tidier detail on a deep reveal, or in an older house where nothing is square and a straight board would leave tapering gaps at the ends.
The sill over the sink
The sill that most needs to be stone, because it is wet from both sides. A low sill over the sink run often leaves less room than an upstand is tall, so the sill, the upstand and the worktop are drawn as one detail at the template, not solved later.
Bathroom sills
A sill over a basin or a bath, cut from the same stone as the vanity top and templated in the same visit, so the shade and the pattern carry across. In a room full of steam, quartz or sintered stone needs nothing applied to it. The vanity itself is on our bathroom worktops page.
Bay and deep reveal sills
A bay is several sills meeting at angles, and a deep reveal can be wide enough to sit on. Each is templated as it is built, because the angles of a bay and the depth of an old reveal are rarely what a drawing says, and any joint is placed where it reads as a line rather than a mistake.
A sill on its own
A sill for a room with no stone worktop, or a replacement for a tired timber board. With nothing to match, the choice is about looks and how the window gets used. Which stone suits which room is covered in our guide, which stone for a window sill.
Choosing the stone
Which material for a window sill
Supply rates are read from our catalogue and cover the stone only. Cutting, the notches, the edge and fitting are quoted with the sill as one piece.
| Material | Colours | Supply from | On a window sill |
|---|---|---|---|
| Quartz | 69 | £130/m² | Kitchens and bathrooms. Non-porous and never sealed, so water standing on it from a wet window does nothing, and the natural choice under a quartz worktop. It contains resin, so it is not the stone for a sill in strong direct sun all afternoon. |
| Granite | 45 | £121/m² | A sill that reads as natural stone, and one that matches a granite worktop. Hard-wearing and indifferent to heat; porous, so it is sealed before fitting, which matters on a sill that gets wet every morning. |
| Dekton | 63 | £110/m² | A sill in direct sun all afternoon, because there is no resin in it, and a wet sill that should never need sealing. Thinner formats are available in some designs. |
| Sintered stone | 8 | £280/m² | Our own sintered stone range, for the same reasons: no resin, no sealing, and stable in strong sun. A good match where the worktop below it is the same stone. |
Free samples are posted from the Worktop Worx quartz collection, up to four at a time. Other quartz, granite and sintered stone are judged from the slab.
What is involved
From a bare reveal to a finished sill
The best moment to decide on a sill is the worktop quote. Everything after that is quick.
- At quotation
Mention the sill when you ask for a quote
Even if you are undecided. A sill has to be drawn onto the cutting layout while the drawing is being made; once the slab is cut, the piece you wanted may no longer exist.
- Before template
Choose the stone, usually the worktop
Where a worktop runs beneath the window, the sill matches it and comes off the same slab run. On its own, any of the stones works and the choice is about looks and light.
- On site
Template the reveal
Taken on site once the window and the plaster are in, in the same visit as the worktop. Sill height and reveal depth are rarely measured before we arrive, and a reveal in an older house is seldom square, so they are recorded as they are.
- Workshop
Cut, notch and polish
In our own workshop: cut to the template, notched into the reveal where that is the detail, and the front edge and any exposed ends profiled and polished to match the worktop edge or kept plain.
- Fitting day
Fit with the worktop
Fitted by our own team on the same day as the worktop where it is part of the same job, bedded level and sealed at the frame and the reveal. The worktop is fitted 5–10 working days from template.
The parts that decide it
What a stone window sill has to get right
A small piece with nowhere to hide. These are the details that make it look as if it was always there.
The same batch as the worktop
Engineered quartz and sintered stone are made in batches, and two slabs of the same named design can differ in tone and in the scale of the veining. Across a room that is invisible; on a sill directly above the worktop, under the light from the window, it is not. Granite has no batch at all: two slabs a year apart are different stones.
Often from the offcut
Stone is bought by the slab, not by the square metre you use, and a kitchen nested onto a slab usually leaves some over. The sill and the upstands often come out of that, which is why a stone sill costs less than people expect when it is ordered with the worktop.
The worktop thickness
A sill cut from the same slab is the worktop thickness, and that is usually what you want: it reads as part of one kitchen. If the worktop has a mitred front to look thicker, the sill does not have to copy it; a plain edge at the slab thickness is the normal detail for a piece set back in a reveal.
Standard or notched, decided on site
Which one the opening wants is confirmed at the template, because it depends on the depth and squareness of the reveal, not on the drawing. A notch that follows a reveal out of square is cut to the template rather than to a right angle.
The front edge
The front edge and any end that oversails the wall are profiled and polished. Matching the worktop profile ties the two together; a plain pencil round keeps a sill quiet in a busy window.
Inside only
These are internal sills, the board inside the window reveal. The sill on the outside of the building is a weathering detail and a different trade, so it is not something we take on.
Before we template
What has to be ready, and what is not ours
Most of this is the window and the wall. It is on this page because the stone cannot correct any of it.
Have this in place
- The window fitted and the reveal plastered, so the opening is final
- The old sill out, or agreed that we template with it in and it comes out on the day
- Any blind, shutter or curtain fixings in the reveal known, so the sill clears them
- Radiator or socket positions under the window known
- The worktop colour chosen, if the sill is to match it
- The sill mentioned on the worktop quote, while the offcut is still uncut
What we do not do
- Fit, replace or adjust windows or frames
- Plaster or make good the reveal
- External sills on the outside of the building
- Move radiators, sockets or blind fixings
- Promise a match to a worktop fitted from an earlier batch
Questions
Stone windowsills: the questions worth asking
If yours is not here, ring and ask. You will get a straight answer rather than a call-back from a salesperson.
01What is the best stone for a window sill?
Usually the stone your worktop is made of, cut from the same batch at the same template visit. Quartz suits most kitchens and bathrooms because standing water from a wet window does nothing to it. Granite needs the same sealing as a granite worktop. Sintered stone suits a sill in direct sun all afternoon, because there is no resin in it.
02How much does a stone window sill cost?
A sill is priced as a piece on your quote rather than by area, because the cutting and the finished edges are most of the work. The stone is the same supply rate as the worktop, from £110 to £550/m² across the surfaces we hold, stone only. If the sill comes out of an offcut you have already paid for, the material cost falls away almost entirely and you pay for the cutting and fitting.
03What is the difference between a standard and a notched sill?
A standard sill is a straight board that sits on the opening and butts up to the reveal on either side. A notched sill is scribed into the reveal so it sits inside the opening. Notched is the tidier detail on a deep reveal or in an older house where nothing is square; we confirm which the opening wants at the template.
04Can a window sill match my worktop?
Yes, if it is ordered with the worktop: it comes off the same slab run and is templated in the same visit. Ordered later, engineered stone may have changed batch and granite will be a different slab, so expect a close relative rather than a twin, and on a sill directly above the worktop that difference shows.
05Can you fit a stone sill without a new worktop?
Yes. A sill on its own, or a set of sills for a house, is templated and cut in the same way. With no worktop to match, choose the stone for the room and the light, and send us the window widths and reveal depths when you ask for a quote.
06Do you do external window sills?
No. These are internal sills, the board inside the window reveal. The sill on the outside of the building is a weathering detail that belongs to a different trade.
Where we work
Stone windowsills across London
We template and fit across Greater London and out into Essex, Hertfordshire, Surrey, Buckinghamshire and Berkshire. The stone is cut in our workshop and fitted by our own installers, wherever the job is.
Next
What usually happens either side of this
Every job runs through more than one of these. Follow the thread rather than guessing which order things go in.
Bathroom worktops
Vanity tops, shelves and window returns, cut to bathroom depths.
Splashbacks & upstands
Cut from the same slab run as your worktop, so the match is real.
Read the detailBespoke stone
Table tops, stairs, shelves, boards and more, cut from the same stone.
Read the detailWorth reading
Before you book stone windowsills
The questions that come up most, answered in full rather than in a sentence.
A window sill cut with the worktop
The best stone for an internal window sill is usually the one your worktop is made of, cut from the same batch at the same template visit. Quartz suits most kitchens and bathrooms, granite suits a sill you will seal, and a notched sill sits neatly inside the reveal.
Read the guideTwenty or thirty millimetres, and why it matters
What the two standard thicknesses actually change, what they do not (strength, mostly), and why the honest deciding factors are weight, the carry into your kitchen and how you want the edge to read.
Read the guideWhich edge profile suits which kitchen
The edge is the part of the worktop you touch every day and the detail that dates a kitchen fastest. What the common profiles are, what each costs you in labour, and how to pick.
Read the guideStone for the bathroom vanity
A stone vanity top is cut from the same slabs as a kitchen worktop, in a narrower width, and quartz is the easy choice for a bathroom because it never needs sealing. The top is cut for the basin and tap you bought, and a plumber connects them afterwards.
Read the guide5.0 from 26 Google reviews
Every one of these is on our Google profile under the reviewer’s own name. Nothing here is written by us, and the link goes straight to the source.
Read all 26 See them on Google
Count as read from Google on 4 September 2026
“I am really happy with the work! He fitted my kitchen granite worktop really nicely and got the job done on time, just as promised. He was friendly, professional, and made sure everything was done the way I wanted. Would definitely recommend Karam to anyone looking for a great job!”
“We recently had our kitchen worktops supplied and fitted by Worktop WorX using Laurent Gold sintered stone, and we couldn’t be happier with the result. The finish, quality, and attention to detail were outstanding from start to finish. Karem was incredibly helpful throughout the whole process professional, knowledgeable, and always available to answer…”
“We have a new kitchen. Our builder recommended Worktop Worx for our worktop. Now we have an amazing worktop very good price too. Really recommend. They were really good to us. 10/10”
“I used Karem’s services 5 years ago for purchasing and fitting the quartz worktop in my then brand new kitchen. The price was reasonable and the service reliable and spot on, no delays in fitting, misunderstanding or excuses. I recommended him to a friend, who also used his services and they were happy too! If I need to order new kitchen work top again,…”
“Absolutely delighted with our new worktop from Worktop WorX. The Capri White finish looks incredible, clean, modern, and really brightens up the whole kitchen while pairing beautifully with the darker cabinetry. The quality of the worktop is outstanding, with a flawless finish and seamless installation that really shows the attention to detail. It’s not…”
“Kareem did the countertops dur8ng my kitchen remodel, and I was so impressed that I had him back to do the laundry room as well, which tells you everything you need to know. He is an absolute gem. Shows up when he says he will (which, let’s be honest, is rarer than it should be), does beautifully work, and clearly takes real pride in what he does. The…”
8 of our 26 Google reviews name Karem, who owns and runs Worktop Worx.
Next step
Send us the window and we will price the sill
The window width and the depth of the reveal, a photograph if you have one, and the worktop it should match is enough to start. The quote costs nothing.