A kitchen extension changes how the whole ground floor works: more light, room to cook and eat together, and a direct line to the garden. In Isleworth, where Victorian and Edwardian terraces and 1930s semis sit close to the river, the right extension is the one the house was waiting for.
Sovran designs, permits and builds kitchen extensions in Isleworth, Osterley, Brentford and Spring Grove as one team, with one point of contact from the first sketch to handover. Our studio is on Swan Street in Isleworth, so your project is local to us.
Bottom line: a kitchen extension in Isleworth takes 12 to 20 weeks on site for a rear extension and up to 24 weeks for a wraparound. Many rear extensions can proceed under permitted development, up to 3m on terraces and semis and 4m on detached homes.
A kitchen extension is almost always one of these three. We choose by plot, not by default.
The back of the house extends into the garden for an open kitchen and dining space. It is the usual route for the 1930s semis around Isleworth and Osterley, and the simplest to plan. Rear extensions take 12 to 20 weeks on site.
The strip beside the kitchen in an Isleworth terrace becomes part of the room. The kitchen widens and light comes in from above. Side return extensions take 14 to 22 weeks on site.
Side and rear combined into one generous space, the largest gain in floor area a ground floor can offer. Wraparound extensions usually need full planning permission and take 16 to 24 weeks on site.
Isleworth sits in the London Borough of Hounslow. Planning is settled before design starts, so the scheme is drawn around a route that is already known.
Most Isleworth houses are terraced or semi-detached, so the 3m limit for a single-storey rear extension is the one that usually applies. Detached homes can go to 4m, and prior approval allows up to 6m and 8m.
Side return and wraparound extensions, and anything beyond the permitted development limits, need a planning application to Hounslow.
Part of Isleworth is protected. Isleworth Riverside, Spring Grove and Woodlands Grove are conservation areas, and there are many listed buildings, including around Syon Park. In a conservation area or on a listed building, the rules are tighter and Listed Building Consent applies where relevant.
Our planning team includes former local authority planning officers, and 97% of our planning applications are approved.
Some streets close to the river lie in a flood zone. Where that applies, the application shows how flood risk is managed, and floor levels, materials and drainage are chosen with it in mind.
The same team designs and builds your extension, so window height, rooflight position and cabinetry spacing are drawn once and delivered as drawn.
What we look at first:
Sovran's interior design team designs the kitchen with the extension, as part of the same project, so the room is finished as one piece of work.
Generic averages mislead, because size, structure, specification and access change the price. Budgets around £50k suit smaller works, and the figure rises with the scale of the extension. Sovran fixes the price after the survey and design are complete.
For an early estimate, the cost calculator is a live 3D model of your extension. A well-designed extension typically adds 10 to 20% to the value of a home.
Surveyed before anything is drawn.
The extension shaped around light, garden and the way you cook.
Planning route confirmed; permitted development, prior approval or full application managed for you.
One team on site, one point of contact.
A new room, finished as imagined.
Often not for a single-storey rear extension. Permitted development allows up to 3m on terraced and semi-detached houses and 4m on detached homes, and up to 6m and 8m through prior approval. Side return and wraparound extensions, flats, homes in a conservation area and listed buildings usually need planning permission or consent. Sovran confirms the route for your address before design starts, so you know what applies before you commit.
The cost depends on size, structure, specification and access, which is why a generic average is unreliable. Budgets around £50k suit smaller works, and the figure rises with the scale and complexity of the extension. Sovran fixes the price once the survey and design are complete. The cost calculator gives an early estimate in minutes, and a well-designed extension typically adds 10 to 20% to the value of the home.
On site, a rear extension takes 12 to 20 weeks, a side return 14 to 22 weeks and a wraparound 16 to 24 weeks. Design and planning come first. Permitted development is faster than a full planning application, which adds time before work starts. We agree the programme at the start and manage it as one team, so you know what happens each week.
It depends on the plot. A rear extension suits most houses and is the simplest route. A side return suits Victorian and Edwardian terraces with a narrow passage beside the kitchen. A wraparound combines both and gives the largest space, with the most structural work. We survey the house, then recommend the route that gives the best room for the budget and the best chance of approval.
Yes. Sovran designs, permits and builds the extension, and its interior design team designs the kitchen as part of the same project. Layout, joinery, appliances and services are planned together with the structure, so there is one design intent and one programme from start to finish.
Usually yes. Most of the work happens outside the existing house until the new space is opened up, and we agree a plan for the days when the kitchen is out of use. Dust and access are managed throughout, and we explain each stage in advance so there are no surprises.
Often, yes. Side return and wraparound extensions build against or close to a neighbour's wall and foundations, so the Party Wall Act applies and notices are served before work starts. Sovran prepares the notices and manages the agreements as part of the project.
Explore our House Extensions service, House Renovation in Richmond, our Design and Build approach and the cost calculator.
Tell us about your house and the kitchen you want. We will come back with a clear scope and the next steps.
Every great space starts somewhere. Pick a time that works for you and we'll show you what's possible.