Structural alterations, new openings and steel support in Southall. Trusted, professional, 30+ years' hands-on experience.
GS Renovation carries out structural alterations throughout Southall, from new openings and replacement joists to supported openings and underpinning in the interwar houses of UB1. Over 30 years working across Ealing, Hanwell and Acton means we understand how these 1930s properties are built and how to change them without compromising the structure.

Interwar houses in Southall sit on generous plots, so alterations here are varied: widening a doorway between reception rooms, forming a new opening to a side return, replacing tired floor joists, or installing a supported opening where a beam carries the wall above. Each of these changes how load travels through the building, so we begin with a structural engineer's design rather than guesswork on site.
For openings we use steel beams bearing onto padstones, temporary propping and staged demolition, exactly as the calculations require. Where original 1930s joists have sagged or been weakened by earlier alterations, we replace them to modern spans. Every element is designed to carry its share of the load so your interwar home stays sound long after the work is finished.
Some UB1 homes show movement in the older shallow foundations typical of the interwar period, particularly on the clay soils common across West London near Walpole Park and Ealing Common. Where an engineer confirms it is needed, we underpin in controlled sequenced bays to deepen the foundation safely, and we always establish the cause first so the fix addresses the real problem rather than the symptom.
Structural alterations are governed by the Building Regulations, so they need building control sign-off, not planning permission, unless you are altering the exterior in a conservation area or a listed building. Where an alteration affects the shared party wall of your semi, you serve notice on the neighbour under the Party Wall Act, then manage Ealing Council's building control inspections through to the completion certificate.
Homeowners across Southall trust GS Renovation because we keep structural alterations under one roof. The engineer, the steelwork, the underpinning and Ealing building control are all handled by the same team that does the building. With 30+ years in UB1 and neighbouring Hanwell and Acton, we deliver work that is designed properly, built cleanly and fully certified.
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
Very friendly and I am very pleased with the work he has done, also very clean worker and enthusiastic about his work. Can not fault this company!!!!…
George is a very hard working builder, and has done a fantastic job on replacing my Bathroom. His attention to detail was great and I wouldn't…
FAQ
Not from us, though there are unknowns and we name them upfront. On an older Southall property structural alterations can uncover wiring, timber or drainage that nobody could see at the UB1 survey, and we tell you what we suspect before starting. Anything additional is priced and agreed in writing first. GS Renovation has never treated a surprise as a licence to inflate an Ealing invoice. Ring 07472 424 226 and GS Renovation will name the likely unknowns at your UB1 address. 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.
We start when we can see the job through. Taking on structural alterations at a Southall property and then disappearing to another site is the commonest complaint about builders, so GS Renovation schedules the UB1 project properly instead. Availability changes by season and by how many Ealing jobs are running. Call 07472 424 226 and you will get honest dates, not a holding answer. The UB1 survey is free and puts a Southall project into the Ealing schedule.
We tell you immediately, price the fix, and get your agreement before continuing. Problems on a structural alterations job usually surface when a 1930s and interwar UB1 property is opened up, and hiding them helps nobody. GS Renovation sets out the effect on the Southall programme and on the cost in writing. Work resumes once you have decided, not before. Ring 07472 424 226 to hear how Ealing variations are agreed. Nothing at UB1 proceeds without your written approval in Southall.
Yes. New openings, steel beams, replacement joists and underpinning are all notifiable, must be designed by a structural engineer and signed off by Ealing Council. Planning permission is only engaged where the work affects the exterior or a listed building. GS Renovation handles the approvals for your UB1 property.
Many times, and we can give you addresses. 1930s semi-detached and interwar suburban houses on generous plots dominate that part of Southall, so structural alterations on them is routine work for GS Renovation rather than something we adapt to. The 31 public MyBuilder reviews behind our 4.9 rating cover the same kind of project. Ring 07472 424 226 and we will point you at recent work in Ealing. Email info@gsrenovationltd.co.uk and we will send UB1 addresses where structural alterations of this kind was carried out.
Usually not. Internal structural alterations such as new openings, replacement joists or underpinning are controlled under the Building Regulations, so they need Ealing building control sign-off rather than planning permission. Planning only comes into play for exterior changes in a conservation area or to a listed building. We handle the building control side for you as part of the job.
We work on both, and the difference is consent rather than construction. A Southall flat needs the freeholder's agreement before structural alterations begins, and in a period block the structure at UB1 may be carrying load from several storeys. GS Renovation establishes that with an engineer first. The survey across Ealing costs nothing. Ring 07472 424 226 and we will explain the Ealing Council position. Freeholder consent is confirmed before any UB1 design work begins.
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 Southall. Explore what else we do locally:
Same Service, Nearby Areas
We carry out structural alterations across Southall and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for structural alterations in Southall. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.