Structural alterations, new openings and steel support in Pimlico. Trusted, professional, 30+ years' hands-on experience.
GS Renovation carries out structural alterations throughout Pimlico, from forming new openings in the garden-square terraces to replacing tired joists and underpinning below SW1's Georgian and Regency townhouses. More than 30 years working on Westminster's period stock means we understand how these listed and conservation-area homes are built and how to change them without harming them.

Alterations in Pimlico cover far more than knocking a wall through. We form new supported openings between rooms, replace joists that have sagged or been weakened over a century and a half, install steel to carry masonry above a widened doorway, and underpin where the original shallow Georgian footings need strengthening for a basement or a heavier load.
Every one of these is an engineered job. A structural engineer specifies the beam sizes, the padstones they bear onto, the joist spans and any underpinning sequence, and we build strictly to those calculations. In a tall Regency townhouse the loads stack up through several storeys, so getting the support detail right at each level matters as much as the finished appearance.
Where an alteration touches the party wall shared with the house next door, whether cutting in a new bearing or underpinning along the boundary, the Party Wall Act applies and you serve notice on the adjoining owner in good time. Pimlico's tight-packed terraces mean this comes up on most jobs, so we treat it as a standard early step rather than an afterthought.
The structural work itself is notifiable under the Building Regulations and Westminster City Council's building control inspects and signs it off. Internal alterations do not need planning permission. That changes only if the property is listed or the work affects a conservation-area exterior, in which case listed-building or planning consent is required, and we help you establish which applies before committing.
For structural alterations in Pimlico, GS Renovation gives you a single team accountable from first survey to sign-off. We arrange the engineer's calculations, serve any coordinate Westminster building control, and carry out openings, joist replacement and underpinning to specification. Over 30 years in SW1's period townhouses means the work is safe, certified and sympathetic to the building.
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
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.
FAQ
Everything needed to finish the work and get it signed off. The structural alterations quotation for a Pimlico home covers labour, materials, the structural engineer where the design requires one, the Westminster City Council building control element, and the making good afterwards. Anything genuinely uncertain at the SW1 property is flagged before we start rather than added later. GS Renovation issues it after a free SW1 survey, with no obligation in Pimlico or the wider Westminster. 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 tell you early rather than at the end. Most overruns on a structural alterations job in a Pimlico home come from something found once the SW1 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 Westminster programme is reissued so you can plan. Nothing is added to a Pimlico account at SW1 because a Westminster programme slipped.
We are a contractor, not a middleman. The structural alterations work at your SW1 property is carried out by our own team rather than brokered to whoever is cheapest that week, which is why one person can be accountable for the whole Pimlico job. GS Renovation is fully insured, company number 14611254. The engineer, where the design needs one, is appointed by us. Ring 07472 424 226 for Westminster references. The certificate is available at the SW1 survey in Westminster.
Yes, and often they should be. Sequencing matters more than speed with structural work: propping, then removal, then permanent support, with Westminster City Council inspecting at each defined point. We set that order out for your Pimlico project before starting.
It is our core work rather than a sideline. Stucco-fronted townhouses and early Victorian villas with deep basements dominate much of Westminster, and structural alterations on them is what GS Renovation is on site doing most weeks. The 4.9 rating from 31 public MyBuilder reviews covers the same type of project. Ring 07472 424 226 and we will describe recent Pimlico jobs at SW1. Pimlico references for structural alterations on properties of exactly that age and type all follow on info@gsrenovationltd.co.uk request too.
Sometimes. Many Pimlico townhouses sit on shallow Georgian and Regency footings that were fine for their day but may need strengthening for a basement, a new opening or added load. A structural engineer assesses whether underpinning is required and specifies the sequence. Where it runs along the party wall, the Party Wall Act applies and you serve notice before starting.
We work on both, and the difference is consent rather than construction. A Pimlico flat needs the freeholder's agreement before structural alterations begins, and in a period block the structure at SW1 may be carrying load from several storeys. GS Renovation establishes that with an engineer first. The survey across Westminster costs nothing. Ring 07472 424 226 and we will explain the Westminster City Council position. Freeholder consent is confirmed before any SW1 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 Pimlico. Explore what else we do locally:
Same Service, Nearby Areas
We carry out structural alterations across Pimlico and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for structural alterations in Pimlico. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.