Structural alterations, new openings and steel support in Tottenham. Trusted, professional, 30+ years' hands-on experience.
GS Renovation carries out structural alterations throughout Tottenham, from new openings to replacement joists and underpinning in the Victorian and Edwardian terraces of N17. With over 30 years of building experience in Haringey, we design and install the supports your period home needs, all inspected and signed off under the Building Regulations.

Tottenham's terraces were built with rear closet wings and side returns, and over time those additions and the original floors bring their own structural problems. We form new openings between rooms, replace tired or overloaded joists, create supported openings for wider doorways, and underpin foundations where movement or a basement dig calls for it. Each job starts with a structural engineer setting out the design.
Whatever the alteration, the principle is the same. A steel beam or lintel is sized for the loads it will carry, it bears onto padstones at each end, and the work above is temporarily propped while we cut and build. We demolish in staged sections, install the steel, then remove the props once everything is bearing correctly, so the house stays stable throughout.
Internal structural alterations in your N17 home are governed by the Building Regulations, not planning permission. Haringey Council's building control inspects the propping, the padstones and the finished steelwork. Planning only comes into play if you are in a conservation area and changing the exterior, or the property is listed, so most interior work simply needs building control approval and certification.
Where an alteration touches the shared party wall, such as bearing a beam into it or underpinning alongside it, the Party Wall Act applies and you serve notice on the adjoining owner first. We manage the engineer's calculations and the building control inspections together, so a single team is answerable for every stage of the job.
Homeowners in Tottenham choose GS Renovation for structural alterations because we keep the engineer, Haringey building control and the site work under one roof. Nothing falls between trades. You get the right steel or underpinning designed for your N17 terrace, tidy working around your family, certified sign-off and 30+ years of experience behind it.
Punctual, worked hard, and did exactly what he was asked and what he said he would do. Overall, a very high quality job. Will use again.
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
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
Enough for the scoped work plus a sensible allowance for the unseen. GS Renovation prices what the N17 survey shows, names anything that could change once structural alterations opens up a late Victorian and Edwardian structure, and leaves the decision with you. The Haringey Council fee belongs in the same budget. Nothing is added to a Tottenham project without written agreement. Ring 07472 424 226 and we will explain the likely contingency for an N17 property in Tottenham. 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.
Less often than owners fear. In Tottenham houses, cracked plaster and sticking doors more commonly trace back to a decayed lintel, an opening formed earlier without proper support, or a leaking drain washing material from beneath a footing. Clay ground moving seasonally accounts for some of it. The cause is diagnosed before a remedy is proposed, because underpinning a house that has a drainage fault fixes nothing.
That the ground moves with moisture, so new work is designed for it. Where your Tottenham property sits on clay, foundations for an extension or new piers are taken to a depth the engineer specifies, with allowance for nearby trees and their influence on the soil. New foundations that stop shallower than the existing ones move differently, and the crack that follows appears at the junction between them.
It gets assessed, and regularisation is often the route. Unapproved openings, extensions and conversions are common in Tottenham housing, and they surface when a property is sold or when new work is proposed alongside them. The engineer inspects what was built, and where it is adequate a regularisation application can bring it into the record. Where it is not, it is corrected before anything new is added.
All the way to the ground. A new beam in your Tottenham house concentrates load at its bearings. Everything below those points has to be capable of taking it, including the wall beneath, any opening already formed in it and the foundation at the bottom. The engineer checks the whole route. A beam correctly sized but landing on an inadequate support below has moved the problem rather than solved it.
With the owner's instruction and proper notice to the occupier. Structural work at a Tottenham rental is commissioned by the landlord rather than the tenant, and the tenancy governs when access is available and what warning is due. Where the work makes a room unusable, that has to be arranged rather than assumed. The approvals required are the same as for an owner occupied house.
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 Tottenham. Explore what else we do locally:
Same Service, Nearby Areas
We carry out structural alterations across Tottenham and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for structural alterations in Tottenham. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.