Structural steel frame installed during a TopBuild UK extension project in London

Completed Tudor-style wing extension in Hampstead under a clear blue sky

New build house exterior, Rowan Walk, Hornchurch

Fitness room corridor with skylight and garden view, luxury renovation, Haringey

Front of the renovated house in Basing Hill, Hampstead, with a resin-bound driveway

Building & Structural Contractors · London & the M25

Steel Beam Installation London

Structural Works, Extensions, Loft Conversions & Complete Property Transformations

TopBuild UK is operated by Pitbuild Ltd, an established London building and structural contractor working across London and within the M25. We specialise in steel beam installation, structural alterations, extensions, loft conversions, renovations and complete property transformations.

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26+

Years trading

Year guarantee on structural work

What we do

Bespoke building services, delivered end to end

From steel beam installation and structural alterations to extensions, loft conversions and complete renovations, we deliver coordinated building work from the groundwork through to the final finish.

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New Builds

New Build Homes

Bespoke homes delivered from groundwork to completion.

Extensions

Rear, side and double-storey extensions across London.

Loft Living

Loft Conversions

Dormers and roof conversions designed around your home.

Renovation

House Remodelling

Complete property transformations and structural alterations.

Interiors

Kitchen Installations

Carefully fitted kitchens for new and renovated spaces.

Interiors

Bathroom Installations

Bathrooms, wet rooms and specialist installations.

Finishes

Flooring Installations

Hardwood, engineered, laminate, tile and stone flooring.

Project Delivery

Planning & Project Management

Coordinated planning, professional teams and building control.

Roofing

Glass, GRP and traditional roofing installations.

Structural & Steel

Structural Works

Steel beams, RSJs and structural alterations.

How we work

A clear process from quote to handover

Every project is scoped, quoted and delivered against a clear specification, with structural work backed by a 10-year guarantee.

Consultation

We visit your site, listen to the brief and give you an honest read on scope, budget and programme.

Fixed-price quotation

A clear, itemised quotation against a defined specification — no vague allowances, no surprises.

Coordinated delivery

We work alongside your architect, surveyor and structural engineer, tracked against programme with regular updates.

Handover & guarantee

Completed to a finished standard, with a 10-year guarantee on all structural work.

Recent work

Selected projects across London

A selection of structural works, extensions, loft conversions, renovations and complete property transformations delivered across London and within the M25.

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