Single and double storey extensions in Hornchurch. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Hornchurch, where 1930s semi-detached and interwar houses sit on generous plots that suit rear and side additions. With over 30 years in RM11 and the surrounding Havering suburbs, we handle foundations, steelwork, roofing and full fit-out, and guide you through permitted development or a planning application to Havering Council.

The wide plots that characterise Hornchurch give real scope for extending. A single storey rear extension across the back of a 1930s semi creates the open-plan kitchen-diner most families want, while the space down the side of a detached or semi-detached house suits a side-return or wrap-around that squares off the ground floor. We begin with trial holes and properly designed foundations, because interwar houses were built with shallower footings than modern regulations require.
From there we form the openings with engineer-designed steel beams, build up in matching brick, tie in the new roof and install the glazing, then complete the internal fit-out. Because a rear extension of a Hornchurch semi typically involves work near or on the party wall, you serve the correct notices to neighbours. Every element is inspected by Havering building control, from foundations and drainage to insulation and the finished structure.
Many single storey rear extensions on Hornchurch houses fall under permitted development, meaning they can proceed without a full planning application provided they stay within the size, height and boundary limits the rules set. On the larger interwar plots this often gives generous scope. We assess your property against the current criteria and, where it qualifies, recommend a lawful development certificate from Havering Council to confirm the position in writing.
Double storey extensions, wrap-arounds, work that fronts the street or anything beyond permitted development limits will need a full planning application to Havering Council, and we prepare and manage that submission for you. Whichever route applies, building regulations still govern the structure, so foundations, beams, insulation, fire safety and drainage are inspected regardless. We are clear from the outset about which consent your specific project needs so there are no surprises.
Hornchurch homeowners choose GS Renovation because one team takes the extension from first survey to final decoration. We build foundations for interwar footings to the engineer's design, install engineer-sized steel, manage handle the permitted development or planning route with Havering Council. With 30+ years across RM11, you get honest advice, building control sign-off and a well-built result.
Really happy with the quality of remedial works carried out by George in putting other previous tradesman work right. He was very helpful, honest and…
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…
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
FAQ
What sits behind the walls drives it far more than the address does. We survey the RM11 property, confirm the load path, and only then price house extensions for your Hornchurch home. Older stock across Havering adds making good, and awkward access adds labour, so both are itemised rather than absorbed. GS Renovation would rather explain a Hornchurch figure than defend it later on site, so ring 07472 424 226 or email info@gsrenovationltd.co.uk first. 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.
We will tell you exactly, once we have seen the house. Guessing a house extensions duration for a Hornchurch property without a survey helps nobody, and the RM11 visit is free. GS Renovation then issues a staged programme including the Havering Council inspection dates and the drying time that cannot be rushed. That is the version to plan a Havering household around. Ring 07472 424 226 and we will describe how a similar RM11 job ran in Havering.
Paperwork is where house extensions projects quietly lose time, so we take it on. GS Renovation runs the Havering Council application and inspections for your RM11 property alongside the works programme, which keeps the Hornchurch job moving. The engineer's design, where the structure requires one, is coordinated by us as well. You receive the certificate at completion. Ring 07472 424 226 to hear how a Havering application runs. The certificate matters when a Havering property changes hands.
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 Hornchurch projects.
Many times, and we can give you addresses. 1920s and 1930s suburban houses with cavity walls and original hipped roofs dominate that part of Hornchurch, so house extensions on them is routine work for GS Renovation rather than something we adapt to. The 31 public MyBuilder reviews behind our 4.9 rating cover the same kind of project. Ring 07472 424 226 and we will point you at recent work in Havering. Email info@gsrenovationltd.co.uk and we will send RM11 addresses where house extensions of this kind was carried out.
It depends on the property. Many single storey rear extensions in Hornchurch fall under permitted development and need no planning application, especially given the generous interwar plots, though a lawful development certificate from Havering Council is worth having. Double storey extensions, wrap-arounds or anything beyond the limits do need planning permission. Either way, building regulations apply, and we confirm the route before we start.
We work on both, and the difference is consent rather than construction. A Hornchurch flat needs the freeholder's agreement before house extensions begins, and in a period block the structure at RM11 may be carrying load from several storeys. GS Renovation establishes that with an engineer first. The survey across Havering costs nothing. Ring 07472 424 226 and we will explain the Havering Council position. Freeholder consent is confirmed before any RM11 design work begins.
Every Service, One Team
The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Hornchurch. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Hornchurch and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Hornchurch. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.