Structural alterations, new openings and steel support in Southgate. Trusted, professional, 30+ years' hands-on experience.
GS Renovation carries out structural alterations throughout Southgate's interwar streets, from new openings in the spine wall to replacement joists and underpinning beneath 1930s semis on their generous N14 plots. With more than 30 years of experience across Enfield, we design, prop and sign off every supported opening to the Building Regulations.

The 1930s and interwar houses around Southgate were solidly built, but their layouts and their timbers reflect the standards of ninety years ago. We form new supported openings between rooms, replace joists that have sagged or suffered decay, and install steel where a wider span is needed, always to a structural engineer's specification rather than guesswork on site.
Where a house near Southgate has movement in a corner or a bay, underpinning may be the answer. We work to the engineer's design, excavating and pouring in sequence so the foundation is deepened without undermining the wall above. Every supported opening bears onto padstones, is propped while the steel goes in, and is inspected before it is closed up.
Structural alterations in an N14 home are notifiable under the Building Regulations. Enfield Council's building control, or an approved inspector, reviews the calculations, inspects propping, beam bearings and any underpinning before they are covered, and issues the completion certificate. This is separate from planning permission, which internal structural work in Southgate does not require unless the house is listed.
Because Southgate's semis share a party wall with the house next door, alterations that cut into or bear onto that wall, or that involve underpinning close to it, are notifiable under the Party Wall Act. We identify this at survey stage and serve the correct notices on your neighbour, so the work proceeds properly and the relationship along the street stays a good one.
Southgate homeowners trust GS Renovation with structural alterations because we keep everything under one roof: engineer's calculations to the adjoining semi, Enfield building control sign-off, and disciplined propping and sequencing on site. You deal with one team, work stays tidy in an occupied N14 home, and every alteration is certified, backed by 30-plus years locally.
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…
Really great job done in our bathroom to replace the shower head in the bathtub, and install a shower screen and caddy. We are very happy with the…
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
We would rather not, because a phone figure is a figure that changes. What structural alterations cost at an N14 address depends on structure and condition we can only see on site, particularly in 1920s and 1930s suburban housing. GS Renovation will happily talk through the likely scope on 07472 424 226, then survey the Southgate property free of charge. The written quotation follows that visit. Nothing is owed for the N14 visit, in Enfield or anywhere beyond it. 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.
Long enough to do it properly, and the programme is agreed before we start. GS Renovation sets out the structural alterations stages week by week for your N14 property, from strip out through structure to making good. What moves the dates is inspection availability at Enfield Council and what a 1920s and 1930s suburban house reveals once opened. Both are explained at the Southgate survey, which costs nothing. Ring 07472 424 226 and we will map the structural alterations stages against your N14 property.
A five year guarantee applies to installations, and it is backed by a real company. We are GS Renovation Ltd, number 14611254, fully insured, which a Southgate homeowner can verify before structural alterations begins at N14. The Enfield Council certificate covers the regulated element. GS Renovation would rather you checked all of it than took our word. Email info@gsrenovationltd.co.uk and we will send the Enfield paperwork. Verification takes a Southgate homeowner about a minute.
The structural engineer. GS Renovation is a contractor: we appoint and coordinate the engineer, arrange the temporary works, and build to their design at your Southgate address. We do not produce calculations ourselves, and any builder claiming to is worth questioning.
Investigation first, method second, price third. Assuming how a 1920s and 1930s suburban Southgate house is built is the commonest mistake on structural alterations, so GS Renovation opens up carefully at N14 rather than relying on drawings. The sequence then protects the rest of the building. Weekly updates keep you ahead of what we find in Enfield. Ring 07472 424 226 and we will describe what structural alterations have recently found in comparable N14 properties right across Enfield.
Yes. Many interwar houses around Southgate sit on shallow foundations, and where an engineer confirms movement we underpin to the design, excavating and concreting in sequence so the wall stays supported throughout. It is notifiable to Enfield building control, and where it is close to the shared party wall we also serve party wall notice on your neighbour first.
We are on sites across Southgate and Enfield most weeks, so yes. That proximity affects three practical things on a structural alterations project: how fast the N14 survey happens, how well we know the Enfield Council process, and how quickly anyone returns afterwards. GS Renovation would rather be judged on those than on a postcode in an advert. Ring 07472 424 226 to check. References are available beforehand. The N14 survey costs nothing and commits you to nothing.
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 Southgate. Explore what else we do locally:
Same Service, Nearby Areas
We carry out structural alterations across Southgate and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for structural alterations in Southgate. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.