Single and double storey extensions in Parsons Green. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Parsons Green, working with the bay-fronted Victorian and Edwardian terraces near the green that have rear closet wings and side returns waiting to be used. With over 30 years in SW6 and across Hammersmith and Fulham, we take your extension from foundations to full fit-out as one project.

The most popular extension on a Parsons Green terrace fills in the side return, that narrow strip alongside the rear closet wing, and often adds a single-storey rear extension to create a wide kitchen-diner opening onto the garden. We handle the groundworks and foundations, allowing for the shallow Victorian footings and any nearby trees on these SW6 plots, then form the new opening with a steel beam sized by the engineer.
Double-storey and wrap-around extensions are also common where owners want an extra bedroom or en-suite above. We manage the roof works, whether a flat roof with rooflights or a pitched tie-in to the existing slope, and match the London stock brick and detailing so the addition sits comfortably against the original terrace and its neighbours.
Whether your extension is permitted development or needs a full planning application depends on the property. Many single-storey rear extensions on Parsons Green terraces fall under permitted development, but properties in a conservation area, or those already extended, often need permission from Hammersmith and Fulham Council. We assess your specific SW6 home and advise on the right route before any work begins.
Extensions always need building regulations approval for the structure, foundations, insulation and drainage, which is separate from planning. Because you are building right up to the boundary and often against a shared wall to the neighbours either side are usually required. We coordinate the council submission, building control inspections and party wall matters so the whole process runs in order.
Homeowners in Parsons Green choose GS Renovation because one team runs the whole extension, from foundations, steel and roof to the finished work and final decoration. We know how the terraces near the green behave, advise honestly on permitted development versus planning, and deliver a build that adds real space and value in SW6, backed by 30+ years locally.
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
George did a great job on our new bathroom. He is a really friendly and helpful guy and always ready to discuss any issues or concerns and come up…
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
FAQ
Variation almost always comes from what has been left out. GS Renovation prices house extensions after a survey at the SW6 property, covering structure, trades, approvals and reinstatement, so the total looks higher than a quote covering half of it. A Parsons Green homeowner comparing like with like usually finds the gap narrows. That is worth doing before anyone starts work in Hammersmith and Fulham. Ring 07472 424 226 and GS Renovation will go through the SW6 quotation with you line by line. 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.
Width where the plan is at its most awkward. The terraces around Parsons Green typically have a narrow rear wing with a passage beside it, and infilling that strip turns a corridor kitchen into a room the full width of the plot. The rear and side walls of the wing are opened, the loads carried on steel designed for the new spans, and rooflights bring light into what becomes a deep floor plate.
By setting the finished floor level before the foundations are poured. Gardens behind Parsons Green terraces are often higher or lower than the internal floor, and the relationship between the two governs the threshold detail, the damp proof course and where surface water goes. Getting it wrong produces a step nobody wanted or a threshold that lets water in. Levels are surveyed at the outset and drainage falls designed to suit.
Frequently, to build or finish a wall on the boundary. Where a Parsons Green extension sits against a shared boundary, scaffolding or finishing the outer face may require entry next door. Access of that kind is arranged through the party wall process rather than assumed, and the timing is agreed with the neighbour in advance. Work is planned so any period of access is short and the ground is reinstated.
Steel designed for the opening and the glass it carries. A long rooflight over a Parsons Green infill removes most of the roof structure over that span, so the remaining loads are taken on beams sized by the engineer, with the deflection limited so the glazing is not stressed. The upstand, the weathering detail and the thermal break matter as much as the steel, because that is where a rooflight leaks.
Boarded and locked at the end of each working day rather than sheeted alone. Where the rear wall of your Parsons Green property is removed to join an extension, the opening is closed with a temporary door or boarding, and the alarm arrangement is discussed with the owner. The exposed period is kept short by preparing everything before the wall is taken out.
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 Parsons Green. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Parsons Green and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Parsons Green. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.