Kitchen Window Ideas: 7 Layouts and the 800mm Glass Rule

Good kitchen window ideas start with the wall, not the glass. Where the window sits, how low the glass goes, which way it opens and what is underneath it decide whether it works every day or just looks good in a photo. This page goes through the layouts that work in UK kitchens, the building regulation points that catch people out (safety glass below 800mm, ventilation, replacement window certificates) and the details that make the difference, like whether the tap clears the opening sash.

Start with the sink wall

The window over the sink is the most common kitchen window in Britain for a practical reason: the drain runs to the outside wall, and the window gives you light where you stand longest. If you are planning a new layout, three measurements decide whether it works.

Worktop height. Most fitted kitchens put the worktop at about 900mm from the floor, as we explain in how high is a kitchen worktop. The sill needs to sit above the worktop plus any upstand or splashback, or you end up with a worktop butting into the window frame.
Tap height. A tall spout or a pull-down tap can foul an inward-opening window, such as a tilt and turn. Check the tap height against the bottom of the opening sash before you order either.
Reach. You will be leaning over a sink and a 600mm deep worktop to open the window. A side-hung casement with a handle at the near edge, or a top-hung opener, is easier to reach than a wide sash.

Kitchen window ideas that work

1. A wide, low-silled window behind the worktop

Dropping the sill to just above the worktop and stretching the window across the run gives you a strip of view and a lot more light than a standard window. The worktop or a matching stone sill can run straight into the reveal. Keep the bottom of the glass above the upstand, so splashes hit the splashback and not the frame.

2. A deep sill as a shelf

In older houses with thick walls, a deep internal sill can hold herbs, a few pots or cookbooks. Finish it in the worktop material or a tiled sill so it can be wiped. It is the cheapest way to make an existing window feel built in.

3. A picture window to the garden

A large fixed pane with a smaller opener beside it frames the garden from the table or the island. Fixed glass costs less per square metre than opening frames and gives cleaner sight lines. Any part of that glass within 800mm of the floor needs safety glazing (more on that below).

4. A glazed splashback window

A long, shallow window set between the worktop and the wall cabinets replaces the splashback with glass. It keeps all your wall storage and still brings light onto the worktop. Check the frame and glass can take heat if it sits behind a hob, and keep it away from the hob on a gas cooker.

5. A bay or box window

A bay gives you a seat, a breakfast table or a deep planting ledge. It also counts as an extension in planning terms, so it is not a straight swap for a flat window. We cover the design side in our kitchen bay window page.

6. Rooflights over the island

In a single-storey kitchen extension, rooflights put daylight on the worktop in the middle of the room, which a wall window cannot do. Rooflights have their own planning rules, separate from windows, so check them early in the design.

7. Doors as the window

In a rear kitchen extension the “window” is often a set of bifold or sliding doors. Plan the layout so the doors are not in the path between sink, hob and fridge, and leave wall space for the units you need. See kitchen layout ideas for how the work zones fit together.

Safety glass, ventilation and certificates

Replacing a kitchen window, or adding one, has to meet the Building Regulations. The Planning Portal’s guidance on doors and windows sets out the main points.

Safety glazing in critical locations. Glass in any panel up to 800mm from the floor must be safety glass. In a glazed door it applies up to 1500mm from the floor, and in a side panel within 300mm of a door edge, up to 1500mm too. A window that starts above a 900mm worktop is usually clear of the 800mm zone, but a floor-to-ceiling picture window or a kitchen door is not.
Ventilation. Kitchens produce steam, so the regulations expect more ventilation than in a living room: normally a mechanical extractor plus an opening window, with background (trickle) ventilators. Do not lose trickle vents when you replace a window. Approved Document F sets intermittent extract in a kitchen at 30 litres a second for a hood over the hob, or 60 for a fan elsewhere; our page on whether a kitchen needs an extractor fan explains it.
Heat loss. New and replacement windows have to meet a maximum U-value set in Approved Document L. A compliant installer will quote windows that meet it.
Means of escape. A replacement window should give at least the same potential for escape as the one it replaces. That matters in a kitchen that opens onto a hallway or stair.
The certificate. An installer registered with a competent person scheme can sign off their own work and you get a certificate when it is done. If you use an unregistered fitter or do it yourself, you need building control approval instead. Keep the certificate: a buyer’s solicitor will ask for it.

Do you need planning permission for a kitchen window?

Usually not, if the new window looks similar to the others on the house. The Planning Portal lists the cases that do need a closer look:

A new bay window is treated as an extension and may need permission.
A new window in an upper-floor side wall must be obscure glazed and either fixed shut or open only above 1.7m from the floor. That matters for first-floor kitchens and flats.
Listed buildings need listed building consent for significant work, inside or out.
Conservation areas, national parks and areas with an Article 4 Direction can remove the usual rights. Ask your council before you order frames.
Leaseholders may need the freeholder’s or management company’s permission first.

A new opening in a wall is also structural work. Making a window wider needs a lintel sized for the load above, and that is building control territory whoever fits the glass.

Blinds, frames and finishes

A kitchen window has to cope with steam, grease and splashes. A few choices help:

Blinds. Roller blinds in a wipeable fabric, or faux wood venetians, cope with moisture better than real wood or heavy fabric. Keep any blind and curtain well clear of the hob.
Frames. Aluminium gives thin sight lines on a large pane. uPVC is cheaper and easy to clean. Timber suits period houses and conservation areas but needs repainting.
Glass. Self-cleaning outer glass helps on a window you cannot reach easily from outside. Obscure glass works where a kitchen faces a neighbour closely.
Reveals. Tiling or stone in the reveal and on the sill makes the window part of the splashback and stops the paint around it from peeling.

Getting it fitted

If the kitchen is being refitted, order the window early. The sill height, tap and splashback all depend on it, and window lead times can be longer than the kitchen’s. Get the window fitted and the opening made good before the worktops are templated, so the worktop fabricator measures to the finished reveal.

For a new opening or a wider window you will need a builder or window installer who handles the lintel and building control. Our page on window fitters in Kent covers what to ask. For more on planning a kitchen from scratch, start at the Contemporary Structures home page.

Frequently asked questions

How high should a kitchen window be above the worktop?

Enough to clear the upstand or splashback, so the frame does not sit where water collects. With a worktop at about 900mm, a sill a little above that works for most kitchens. Check the height of your tap against the opening sash too.

Does a kitchen window need safety glass?

Only the parts in critical locations. Glass up to 800mm from the floor, glass in doors up to 1500mm, and side panels within 300mm of a door edge up to 1500mm all need safety glazing. Glass that starts above a standard worktop usually does not.

Can I put a window behind my hob?

It is better avoided. Leaning across a hot hob to open a window is a burn risk, a draught can affect a gas flame, and blinds or curtains near a hob are a fire risk. A fixed glazed splashback is the safer way to bring light to that wall.

Do I need planning permission to make a kitchen window bigger?

Not usually, if it looks similar to the existing windows and the house is not listed or covered by an Article 4 Direction. Widening the opening does need a correctly sized lintel and building control approval.

Do replacement kitchen windows need trickle vents?

The ventilation of the room must not be made worse. If the old window had trickle vents, the new one should too. Kitchens also need an extractor, so the window alone is not the whole answer.

Kitchen Window Ideas: 7 Layouts and the 800mm Glass Rule

Start with the sink wall

Kitchen window ideas that work

1. A wide, low-silled window behind the worktop

2. A deep sill as a shelf

3. A picture window to the garden

4. A glazed splashback window

5. A bay or box window

6. Rooflights over the island

7. Doors as the window

Safety glass, ventilation and certificates

Do you need planning permission for a kitchen window?

Blinds, frames and finishes

Getting it fitted

Frequently asked questions

How high should a kitchen window be above the worktop?

Does a kitchen window need safety glass?

Can I put a window behind my hob?

Do I need planning permission to make a kitchen window bigger?

Do replacement kitchen windows need trickle vents?

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