Structural alterations, new openings and steel support in Woolwich. Trusted, professional, 30+ years' hands-on experience.
GS Renovation carries out structural alterations throughout Woolwich, working on the bay-fronted Victorian and Edwardian terraces with their rear closet wings and side returns, as well as the new riverside apartments in SE18. Over 30 years in the Royal Borough of Greenwich means we handle new openings, replacement joists, underpinning and supported openings correctly.

The Victorian and Edwardian terraces around Woolwich were rarely built for the way people live now, so structural alterations range from forming a wide opening into the rear closet wing to replacing tired or overspanned floor joists and creating supported openings between rooms. Each of these changes the loads in the building, so a structural engineer designs the work before anyone lifts a tool.
New openings in solid masonry are formed with a steel beam or lintel bearing onto padstones, propped temporarily and built in stages. Where old joists have sagged or been notched, we specify correctly sized replacements at the right centres. Where foundations are shallow, as they often are in older SE18 stock, underpinning may be designed to deepen and strengthen them safely.
Every structural alteration in Woolwich is notifiable under the Building Regulations, so the Royal Borough of Greenwich building control department inspects the work and issues the completion certificate you will need when you sell. Planning permission is a separate matter that only bites on exterior changes in a conservation area or to a listed building, not on internal beams, joists or underpinning.
Because the flank and dividing walls of a Woolwich terrace are usually shared, forming openings, taking bearings or underpinning close to that boundary is notifiable under the Party Wall Act, and you serve the required notices on the neighbour. We coordinate the engineer, the party wall paperwork and the inspections so the alteration is properly designed, built and certified.
Homeowners across SE18 choose GS Renovation for structural alterations because we bring the whole chain together: an engineer designs the openings, joists or underpinning, we coordinate around the party wall award with neighbouring terraces, and Greenwich building control certifies the result. Add careful staged propping, tidy working and more than 30 years of local experience, and you have one accountable team.
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
Not a real one, no. We can explain on 07472 424 226 how structural alterations are usually approached in a Woolwich home and what tends to move the cost, but the SE18 property has to be seen before GS Renovation commits anything to paper. Builders who quote blind across Greenwich are the ones who revise later. Email info@gsrenovationltd.co.uk with the address and we will arrange a time. The SE18 survey carries no obligation of any kind. As a rough guide, structural alterations in London ranges from roughly £1,500 for a simple opening to £15,000 or more where underpinning or major works are involved (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.
Period terraces, post war housing and a substantial amount of newer apartment development. Around Woolwich that range means the same request produces very different work: a Victorian terrace is altered with beams into brick walls, while a recent block is a designed frame where internal walls may carry nothing at all. The construction is established before any structural proposal is made.
Usually, with the masonry above supported while the work proceeds. In an older Woolwich property the wall is solid brick with no cavity, so the full thickness is cut. The load above is carried on needles and props to the engineer's design until the new beam or lintel is in place and pinned up. The bearings each side are formed in sound brickwork.
It depends on the construction and the lease. Some blocks around Woolwich are framed, with partitions that carry nothing and can often be moved with consent, while others are of panel construction where the walls are structural. The lease reserves structural alteration to the freeholder in either case. Both are checked before design work begins, because in some buildings the answer is no.
What was inspected, what the structure is doing, what is causing any defect and what should be done about it. For your Woolwich property that usually includes the load paths relevant to the proposed work, the condition of what was seen, and calculations where new members are required. We appoint the engineer and build to that report, and do not produce structural assessments ourselves.
The roof is almost always the freeholder's responsibility rather than the leaseholder's. In your Woolwich block or converted house, the structure and covering above the top floor are usually retained by the landlord. A leak or a repair is theirs to deal with, even where the damage appears inside one flat. Establishing that from the lease before commissioning work avoids paying for somebody else's obligation.
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 structural alterations across Woolwich and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for structural alterations in Woolwich. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.