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House Extensions Barnes

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

GS Renovation designs and builds extensions across Barnes, adding space to the bay-fronted Victorian and Edwardian terraces and substantial family homes of SW13. With over 30 years in South West London, we handle everything from foundations and steelwork to roofing and fit-out, and we advise clearly on whether your project is permitted development or needs planning permission from Richmond Council.

Steel beams laid out and installed across a rear elevation on a GS Renovation structural job
Two beams on the ground and one already seated. Cavity blockwork and the damp proof course are visible below.

Side-return and rear extensions in Barnes

The most requested extension in Barnes fills the side return beside the rear closet wing, turning a cramped galley kitchen into an open-plan kitchen-diner running the width of the house. We dig and pour new foundations to suit the ground and any nearby trees, tie the brickwork into the existing Victorian wall, and carry the structure over on steel. A glazed roof or roof lantern brings light into what was a dark middle room.

Many single-storey rear and side-return extensions on Barnes terraces fall under permitted development, but this is never guaranteed. Size limits, how close you are to the River Thames or a conservation area, and the specific property all affect it, so some schemes need a full planning application to Richmond Council. We check the position for you, prepare the drawings, and manage the submission, whichever route your Barnes home takes.

Double-storey extensions on Barnes family homes

On the larger family homes of SW13, a double-storey rear extension adds a bigger kitchen below and a bedroom or en-suite above in one build. We match the foundations and brickwork to the existing house, install the steel to carry the new floor and roof, and tie the roofline in so the addition looks original to the property. This suits families staying in Barnes who need more room without moving away from Richmond Park and the river.

A two-storey extension almost always needs planning permission from Richmond Council rather than falling under permitted development, and where it sits on a shared boundary the Party Wall Act applies too. We manage the planning drawings, the structural design together, then build the shell, weatherproof it, and complete the full fit-out. From dig to decoration, one Barnes team stays accountable for the whole project.

  • Trial holes to set foundation depth near drains and trees
  • Party Wall Act notices for excavation near a neighbour's wall
  • Flat and pitched roofs with rooflights or lanterns
  • Planning applications and permitted development assessments
  • Brickwork and mortar matched to the existing elevation
Service areaBarnes · SW13
Local authorityRichmond Council
Part ofSouth West London (Outer London)
Typical homesPeriod cottages and substantial family homes
Also covered nearbyTwickenham, Teddington, Kew and Richmond upon Thames

Why Barnes Homeowners Choose GS Renovation

Families in Barnes choose GS Renovation because we deliver the whole extension under one roof, from groundworks and steel to planning drawings and the final coat of paint. We know how SW13 terraces and family homes are built, we handle Richmond Council submissions and party wall matters, and 30+ years of experience means fewer surprises and a build that adds real value.

  • Structural engineer instructed and coordinated on your behalf
  • Registered in England, Companies House no. 14611254
  • Permitted development checked before you pay for a planning application
  • Photographs kept at each stage for your records
  • Insulation and thermal detailing to current regulations
  • Itemised pricing, so you can see what every stage costs
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

★★★★★
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
★★★★★
I am very happy to recommend George after he completed the work on my 2 bathrooms. He worked very hard to make sure everything was completed and even…
hit10Enfield · via MyBuilder
★★★★★
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
Adil KhanWoolwich, London · via MyBuilder
Read all 31 reviews

FAQ

Frequently Asked Questions about House Extensions Barnes

How much should a Barnes homeowner set aside for house extensions?

Set the figure after the survey rather than before it. Guessing a house extensions budget for a Barnes home usually means guessing wrong in one direction or the other, and the SW13 visit costs nothing. GS Renovation then gives you an itemised written total including the Richmond Council element. Call 07472 424 226 or email info@gsrenovationltd.co.uk to arrange it. The SW13 visit carries no obligation at all, whether the Barnes work goes ahead or not. 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 you finish house extensions at my SW13 property before starting another job?

Yes. The team on your house extensions project stays on it until the SW13 work is finished, which is the whole reason the Barnes programme is predictable. GS Renovation does not open several Richmond upon Thames sites and rotate between them, and that is the commonest complaint homeowners have about builders. One named project manager sees the job through to sign-off. Ask for Richmond upon Thames references and check how an SW13 project actually ran in Barnes.

Can I see reviews of your house extensions work near Barnes?

Read them before you speak to us, ideally. The MyBuilder reviews describe how house extensions projects actually ran, which is more useful to a Barnes homeowner than any claim we could make about the SW13 job. GS Renovation holds a 4.9 rating across 31 reviews. We will supply addresses too, so you can look at finished Richmond upon Thames work. Email info@gsrenovationltd.co.uk for details. Ask for SW13 addresses and visit a finished Richmond upon Thames job.

Do I need a party wall agreement to extend in Barnes?

Usually, if you are excavating near a neighbour's foundations or building on the line of junction, both common on Barnes plots. Notice is served before work starts and a schedule of condition protects both parties. We prepare the paperwork for your SW13 address.

Do Barnes's late Victorian and Edwardian properties cause problems for house extensions?

Not problems so much as variables, and they are manageable when found early. House extensions in an SW13 property of that age can meet irregular structure or earlier alterations, which is exactly what the Barnes survey is for. GS Renovation prices what is visible and names what is not. Anything discovered later is agreed in writing before we continue. Ask on 07472 424 226 what house extensions at an SW13 address in Barnes actually involves in practice.

Will my Barnes extension need planning permission or is it permitted development?

It depends on the property. Many single-storey rear or side-return extensions in Barnes are permitted development, but factors like size, being near the River Thames, or falling within a conservation area can mean you need a full planning application to Richmond Council. Two-storey extensions almost always need permission. We assess your SW13 home first and handle whichever route applies, plus the building control side.

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

All of them, including the streets around SW13 and out towards Twickenham. GS Renovation treats house extensions across Barnes as core work rather than an occasional trip, and we are usually on another Richmond upon Thames site nearby. That often means a survey can happen quickly. Ring 07472 424 226 with the postcode and we will confirm. Nothing is owed for the Barnes visit either way. Aftercare visits are equally straightforward from a nearby Richmond upon Thames site.

Every Service, One Team

More GS Renovation Services in Barnes

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

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House Extensions Near Barnes

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

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