Single and double storey extensions in Woolwich. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Woolwich, working with the bay-fronted Victorian and Edwardian terraces that define much of SE18. With over 30 years in the Royal Borough of Greenwich, we handle everything from foundations and steelwork to the roof and final fit-out, whether your project is permitted development or needs a full planning application.

The classic Woolwich extension fills in the side return beside the original rear closet wing, widening a narrow galley kitchen into a proper kitchen-diner. On these Victorian and Edwardian plots we dig and pour new foundations, tie into the existing solid brickwork, and install steel beams to carry the old external wall once it is opened up. A rear extension across the full width adds even more space where the garden depth allows.
Many single storey rear and side-return projects on these SE18 terraces fall under permitted development, but that is never a given. Corner plots, previous extensions, conservation designations and proximity to boundaries can all trigger the need for planning permission from the Royal Borough of Greenwich. We check the specifics of your property first and advise honestly which route applies, so there are no surprises once the work is under way.
A double storey extension adds a bedroom or bathroom above the new ground floor and suits many of the larger terraced and semi-detached homes around Woolwich. These almost always need a full planning application to the council rather than permitted development, along with building regulations for the structure, insulation and fire safety. We manage the drawings, the engineer's calculations and the building control inspections from start to finish.
Extending against a shared wall means the Party Wall Act applies, so notices go to the neighbours on either side before we break ground. Woolwich terraces sit close together, so we plan access, scaffolding and material deliveries carefully to keep the street and your neighbours onside. Once the shell is weathertight we carry out the full fit-out, tying the new space seamlessly into the existing house.
Woolwich clients choose GS Renovation because one team runs the whole extension, from groundworks and steel to plastering and decoration. We tell you upfront whether your SE18 project is permitted development or needs planning from the Royal Borough of Greenwich, manage building control and keep an occupied home liveable throughout. Three decades of local terraces behind every build.
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…
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
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…
FAQ
Usually the structural work and the making good, in that order. Steel, propping and the engineer's design account for the largest share of a house extensions job at an SE18 address, and reinstating a Victorian and Edwardian terraced interior afterwards accounts for more than most people expect. The Royal Borough of Greenwich fee is small by comparison. GS Renovation shows all three separately on the Woolwich quotation. Ring 07472 424 226 and we will explain the balance at an SE18 property. 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 tell you early rather than at the end. Most overruns on a house extensions job in a Woolwich home come from something found once the SE18 property is opened, and that is costed and agreed in writing before we carry on. GS Renovation does not use delay as a reason to add to the price. The Greenwich programme is reissued so you can plan. Nothing is added to a Woolwich account at SE18 because a Greenwich programme slipped.
The structural work is ours, always. Electricians, plumbers and plasterers are engaged and coordinated by GS Renovation for a house extensions project at an SE18 address, but they work to our programme and our named manager. The engineer, where house extensions need a design, is appointed by us too. Nothing about your Woolwich job is sold on. Ask for Greenwich references and check that yourself. Ask who would attend your SE18 home in Woolwich.
Many single-storey rear extensions in Woolwich fall under permitted development, but side returns, double-storey extensions and work in conservation areas usually need full permission. We assess your SE18 property and manage both the Royal Borough of Greenwich application and building control.
Investigation first, method second, price third. Assuming how a Victorian and Edwardian terraced Woolwich house is built is the commonest mistake on house extensions, so GS Renovation opens up carefully at SE18 rather than relying on drawings. The sequence then protects the rest of the building. Weekly updates keep you ahead of what we find in Greenwich. Ring 07472 424 226 and we will describe what house extensions have recently found in comparable SE18 properties right across Greenwich.
It depends on your specific property. Many single storey rear and side-return extensions on SE18 terraces are permitted development, but double storey work, corner plots, homes that have already been extended, or any conservation constraints usually need a planning application to the Royal Borough of Greenwich. We assess your house first and confirm the correct route before design work begins. Building regulations always apply.
Both are within our normal working area. House extensions are not priced by distance within South East London, so a Woolwich homeowner and an Eltham one get the same treatment and the same free survey. GS Renovation is on Greenwich sites most weeks. Call 07472 424 226 to check availability for your SE18 property. We will be straight with you if it is too far. Aftercare visits afterwards are equally straightforward wherever the property actually sits.
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 Woolwich. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Woolwich and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Woolwich. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.