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House Extensions Purley

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

GS Renovation designs and builds extensions across Purley, where interwar semis and detached houses sit on the kind of generous plots that suit rear and side-return additions. Drawing on more than 30 years in CR8 and around Croydon, we take on the groundworks, the steelwork, the roof and the full fit-out as one continuous project.

A rear extension under construction by GS Renovation, with cavity blockwork built up and the damp proof course laid
Blockwork to damp proof course level, with the membrane dressed over before the next lift goes on.

Rear and side extensions on Purley plots

The wide, deep gardens common to Purley's 1930s houses give real scope for single and double storey rear extensions, side infills along the gap between semis, and wrap-around designs that combine the two. We start with the foundations and groundworks, dig to the depth the ground conditions require, and build up in blockwork before setting the steel beams that carry the new openings into the existing house.

Because these interwar homes were built with modest kitchens at the back, the most popular Purley project opens the rear into a large kitchen-diner with the garden brought into view. We match the new brickwork and roofline to the original as closely as the materials allow, so the extension reads as part of the house rather than an obvious bolt-on.

Planning and party walls in CR8

Many single storey rear extensions on Purley's larger plots fall within permitted development, but this depends on the individual property, its previous alterations and whether any planning constraints apply. Double storey work, anything to the front, and larger footprints usually need a full planning application to Croydon Council. We assess your house honestly and tell you which route applies before any work is priced or started.

Where an extension is built up to or across the boundary with a neighbouring semi, the Party Wall Act comes into play and notice must be served. We coordinate the planning route and the building regulations approval together, so the paperwork moves in step with the build and you are never left waiting on a consent that should have been sorted earlier.

  • Levels, drainage and landscaping made good around the new build
  • Architectural drawings and structural engineer coordination
  • Bi-fold, sliding and French door openings to the garden
  • Single and double storey extensions
  • Trial holes to set foundation depth near drains and trees
Service areaPurley · CR8
Local authorityCroydon Council
Part ofSouth London (Outer London)
Typical homesLarge detached houses and interwar semis
Also covered nearbyCoulsdon, Addiscombe and Croydon

Why Purley Homeowners Choose GS Renovation

Homeowners in Purley come to GS Renovation because we manage an extension from the first trial hole to the final coat of paint with one accountable team. Thirty years across CR8 and Croydon means we understand the interwar construction, the generous plots and the local planning picture. You get honest advice on permitted development, tidy site management and a build that lasts.

  • Paperwork and certificates handed over for when you sell
  • Foundation depth set after trial holes, drains and trees are checked
  • Founder-led team with 30+ years of hands-on experience
  • Free, no-obligation quotations
  • Drainage diverted or built over with the right approval in place
  • Our own trades on site rather than a chain of subcontractors
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

★★★★★
I had a bathroom refit which I was very pleased with and I then went on to get my kitchen refitted as I was so happy with the way he worked. Even…
Customer of GSrenovationvia MyBuilder
★★★★★
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
scomtottIslington, London · 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
Read all 31 reviews

FAQ

Frequently Asked Questions about House Extensions Purley

Do you charge for a survey before quoting house extensions in Purley?

No. The survey is free and carries no obligation, whether the property is in Purley or over in Coulsdon. We look at the CR8 address, explain what house extensions would involve in a home of that age, and follow up with a written quotation. If you decide against it, GS Renovation does not chase you. That applies right across Croydon and the rest of South London, so ring 07472 424 226 whenever it happens to suit. 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.

How disruptive is house extensions in Purley, and for how long?

Enough to notice, but for a shorter period than most people fear. We concentrate the heavy work on a house extensions job at a CR8 home into a defined block, then protect and clean as the Purley project moves on. GS Renovation agrees start and finish times with you, which matters in a terrace. Weekly updates keep a Croydon household ahead of it. GS Renovation agrees working hours at the CR8 property before the Purley job starts.

What makes GS Renovation the right choice for house extensions in Purley?

Over 30 years of hands-on experience sits behind every judgement made on your CR8 site. That is our founder's, and it shows in how house extensions are scoped in 1920s and 1930s suburban housing before anything is committed. GS Renovation is fully insured, handles Croydon Council approvals and leaves the Purley site clean each day. Ring 07472 424 226 and speak to the people who will actually do the Croydon work. Ask to meet the named manager beforehand.

What are the permitted development limits in Purley?

For a single-storey rear extension, commonly 3 metres on a terraced or semi-detached house and 4 on a detached one, with a larger allowance available under prior approval. Those rights are withdrawn in conservation areas and where Article 4 applies, so we confirm your CR8 status with Croydon Council.

How much of your house extensions work in Purley is on 1920s and 1930s suburban homes?

The large majority of it. 1930s semi-detached and interwar suburban houses on generous plots make up most of the housing around CR8, so house extensions on them is what GS Renovation does week in and week out rather than occasionally. That familiarity is why a Purley quotation is priced from experience. References across Croydon are available on request. Email info@gsrenovationltd.co.uk and we will send addresses of several recent house extensions projects on properties of that age near CR8 in Purley itself.

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

It depends on your specific house. Many single storey rear extensions in Purley qualify as permitted development, but double storey additions, front extensions and larger footprints usually need a planning application to Croydon Council. Previous alterations can also use up your permitted development allowance. We check your property first and confirm the route before we begin, then handle the building regulations too.

Do you work beyond Purley on house extensions projects?

We do, and the boundary is not a hard line. What decides it for a house extensions project is whether GS Renovation can survey the CR8 property, run the Purley programme and come back for aftercare without the travel undermining any of it. Most of Croydon and South London qualifies comfortably. Call 07472 424 226 and we will be straight with you. Quotes remain free either way. Aftercare visits to CR8 are part of the same commitment.

Every Service, One Team

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

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

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