Window extensions

Kitchen Extension Guide

The Sterlingbuild Guide to Kitchen Extensions

Our guide to kitchen extensions and advice on breathing new life into your room aims to put you in best position to go about creating your dream cooking and dining area.


Why you should extend your kitchen

With more and more people choosing to wine and dine their friends at home rather than go out to eat, the kitchen has become more important than ever. Many homeowners now regard the kitchen as the heart of the family home instead of the living room.

It is no surprise then that an increasing number are opting to turn their kitchen into an open-plan living space.

Extra room for a dining table big enough to fit the whole family and host large parties is impossible for a lot of kitchens in their current size, so extending the room and creating a stylish, open-plan layout full of natural sunlight has come to be viewed as an ideal home solution.

VELUX skylights for kitchen extension
pitched roof windows for kitchen extensions and single storey extensions

Kitchen extension ideas

ECO+ and RoofLITE PVC windows are contemporary and reliable matches for most kitchen extensions thanks to their easy maintenance levels and ability to fit seamlessly into white spaces. An ideal source of natural sunlight, they are perfectly suited to modern living. VELUX INTEGRA roof windows are another practical suit for kitchens thanks to an ability to regulate temperature and remove unwanted food smells via a sensor.

If you are extending your kitchen space out towards the garden, REAL Aluminium bi-fold doors are a great way of bringing the outdoors in, while also adding a touch of wow to your new space.

What type of kitchen extensions are there?

An increasingly popular kitchen extension choice for homeowners is a rear kitchen extension. Replacing a conservatory by building out towards the garden can make for a larger, open-plan space where homeowners can cook, eat and entertain with ease.

A current trend is to let as much natural light into the room as possible by installing a combination of pitched roof windows or one large flat roof window, such as a Korniche roof latern. Doing this can make the room feel bigger and help create the ultimate fresh air dining experience.  

Alternatively, if your home is designed to allow so, side return extensions, most suitable for Victorian or Edwardian houses, can be built in the ‘side return gap' at the side of the house, allowing extra room for your kitchen.

lantern skylight for flat roofs good for kitchen extensions and single storey extensions
VELUX roof windows for kitchen or single storey extensions filling dining area with natural sunlight

How much does a kitchen extension cost?

Kitchen extension cost is affected by how complex your extension will be. Kitchen extensions with a plastered finish usually cost between £1,260 and £1,680 per square metre.

A straightforward single storey kitchen extension at the rear of your property should cost you between £10,000 and £15,000.

If you are looking to add value to your house, the Office of National Statistics have a handy extension calculator to help you work out if extending or converting your kitchen would be financially worth it.

Important things to consider

Kitchen extension planning permission is always the first thing to think about, whether you think you need it or not. 

The Planning Portal can provide a full picture on limits and conditions to your kitchen extension and is where most planning permissions in England and Wales are now submitted through.

Building regulations around safety and insulation also need to be taken into account. Contact a ‘building control body’ (BCB) for a full list of building regulations appropriate to your property. This can be done by visiting

Visit our Loft Conversion Guide for guidance on who can help you with your kitchen extension. 

VELUX skylights for kitchen and cooking area white finish