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House Extensions Sutton

Single and double storey extensions in Sutton. Trusted, professional, 30+ years' hands-on experience.

GS Renovation designs and builds extensions across Sutton, working with the generous plots that came with its 1930s semi-detached and interwar suburban houses. With over 30 years in SM1, SM2, SM3, SM5 and SM6, we handle single and double storey, rear, side-return and wrap-around projects from foundations to final fit-out.

Steel and new floor joists set out on a rear extension built by GS Renovation at a UK home
The steel seated and the joists hung off it, with the cavity wall closed and scaffold still in place.

Rear and side extensions on Sutton plots

The deep rear gardens and side access common to Sutton's interwar semis make them well suited to extending. A single storey rear extension opens the back of the house into a large kitchen-diner, while a side infill along the passage between two semis reclaims dead ground for a utility or wider kitchen. A wrap-around combines both, and a double storey adds a bedroom and en-suite above the new ground floor.

Every extension starts underground, and around Carshalton and Wallington we design foundations to suit the local ground and any nearby trees, which matters on plots close to Nonsuch Park or Beddington Park where mature planting is common. Steel beams tie the new opening back to the existing house, the roof is built to match, and we complete the fit-out including plastering, electrics, heating and decoration.

Planning and party walls in Sutton

Depending on the size and position, your extension may fall under permitted development or it may need a full planning application to Sutton Council. Larger rear extensions, anything to the front, two storey additions and homes in conservation areas or with existing restrictions usually need planning permission, while modest single storey projects often do not. We assess your specific house early and tell you honestly which route applies before you commit.

Whichever planning route applies, the build itself must satisfy building regulations, and where the extension runs up to or along the boundary with a neighbouring semi the Party Wall Act comes into play. We arrange the coordinate the building control inspections through foundations, steel and roof, and keep the site tidy and secure so you can carry on living in the house while the work goes ahead.

  • Wrap-around extensions and infills
  • Roof works and structural alterations at roof level
  • Brickwork and mortar matched to the existing elevation
  • Architectural drawings and structural engineer coordination
  • Side-return and rear extensions
Service areaSutton · SM1, SM2, SM3 and SM5
Local authoritySutton Council
Part ofSouth London (Outer London)
Typical homesInterwar semis, period houses and leafy suburban streets
Also covered nearbyCroydon, Merton and Kingston upon Thames

The GS Renovation Difference in Sutton

Sutton homeowners choose GS Renovation because we run the whole extension as one accountable project, from advising on permitted development versus a planning application to the groundworks, steel, roof and full fit-out. Over 30 years across the borough means we understand these interwar plots, their foundations and their party walls, and we deliver space that suits how the house actually works.

  • Site left safe and secure at the end of every day
  • Photographs kept at each stage for your records
  • Foundation depth set after trial holes, drains and trees are checked
  • Itemised pricing, so you can see what every stage costs
  • Neighbours given notice before the noisy stages
  • Scaffolding and site set-up planned for tight London plots
30+ YearsFounder's experience
Fully Insured5 year guarantee
4.9 / 531 MyBuilder reviews
Building ControlCompliant
Free QuotesNo obligation
Reviews

Rated 4.9 / 5 by our clients

★★★★★ 4.9 average from 31 verified reviews on MyBuilder

★★★★★
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
khalid75711Barnet · via MyBuilder
★★★★★
It's the second time I have hired George and he has been absolutely professional and the work he did resembles perfectly what I had in mind. Being an…
ariabuffadesignerHornsey, London · via MyBuilder
★★★★★
What can I say!!! George is an extremely lovely man his workmanship is second to none, he has an excellent eye for detail and nothing was to much…
steven62759Waltham Cross · via MyBuilder
Read all 31 reviews

FAQ

Frequently Asked Questions about House Extensions Sutton

Is the price of house extensions higher in Sutton than elsewhere in South London?

No. House extensions are priced from scope, so a Sutton home is not quoted higher than the same house over in Croydon. Where costs do rise is in period stock and awkward access, both of which are checked at the SM1 property. GS Renovation shows those as separate lines so you can see the reason. The SM1 survey costs nothing and there is no obligation afterwards, in Sutton or anywhere in Sutton. As a rough guide, house extensions in London typically starts from roughly £40,000 for a single-storey rear extension and rises with size and specification (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.

Will house extensions take longer in an older Sutton house?

Yes, modestly, and the time is worth spending. Working around original features in a Sutton home means house extensions proceeds carefully rather than quickly, particularly near cornice, sash windows and original floors at an SM1 property. GS Renovation agrees with you beforehand what is being kept. The Sutton Council inspections are booked around that sequence so nothing waits. Ring 07472 424 226 and GS Renovation will describe how an SM1 property in Sutton is protected during the work.

Who manages my house extensions project in Sutton?

The same person throughout, and you will have their direct number. They own the house extensions programme for your Sutton home, agree any variation in writing before it happens at SM1, and provide the weekly update. GS Renovation does not rotate managers mid-project. Where a structural engineer is required they are appointed and coordinated by that manager too. Ask for Sutton references and check it. Ring 07472 424 226 and GS Renovation will name the SM1 manager for Sutton.

Will an extension in Sutton need a CIL payment?

It can. The Community Infrastructure Levy applies above 100 square metres of new floorspace, though a residential extension to your own home usually qualifies for relief if it is claimed before work starts. Missing that claim is expensive, so we flag it early on Sutton projects.

What is the biggest risk doing house extensions in Sutton's 1930s and interwar houses?

Previous alterations that were never approved. A house extensions project at an SM1 property regularly uncovers structure removed by an earlier owner, and Sutton Council will not sign off the new work while that remains unresolved. GS Renovation tells a Sutton homeowner immediately and prices the remedy in writing. Nothing at all is concealed simply to keep a Sutton programme moving. Ask on 07472 424 226 how an unapproved earlier alteration at SM1 affects house extensions in Sutton.

Will my rear extension in Sutton need planning permission or is it permitted development?

It depends on the property. Many single storey rear extensions on Sutton's interwar plots fall within permitted development, but larger projects, double storey additions and homes in conservation areas or with removed rights need a full application to Sutton Council. We check your specific house and its planning history at the outset so you know the correct route before any design work starts.

Which parts of Sutton do you carry out house extensions in?

Everywhere within Sutton and the adjoining parts of South London. The SM1 streets are familiar ground, and house extensions in 1930s and interwar housing is what we do most weeks. GS Renovation does not charge more for one part of Sutton than another. Give us the address on 07472 424 226 and you will get a yes or no immediately. There is no obligation attached to asking. Aftercare and snagging are handled from the same Sutton team.

Every Service, One Team

More GS Renovation Services in Sutton

The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Sutton. Explore what else we do locally:

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House Extensions Near Sutton

We carry out house extensions across Sutton and the surrounding areas. Explore a nearby location:

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Free, no-obligation quote for house extensions in Sutton. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.

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