Service
Structural Works
The structural trades behind our extensions, loft conversions and new builds — steel beam and RSJ installation, load-bearing wall removal, structural concrete, bricklaying and first-fix carpentry — also available as standalone services.
Steel beam installation, often described as RSJ installation, is used to fix structural problems and open up a floorplan for remodelling and new construction projects — fitted in place of load-bearing walls, above door and window openings, or to support a floor structure, deck, hot tub or roof. Steel is a more efficient and affordable material than wood, with better support potential, and acts as an effective barrier against pest infestation, weathering, rot and termites. We use different beam reinforcement techniques, including the addition of welded sections and flats, and install wooden beams too, though steel beams carry more weight than engineered or solid lumber. We undertake steel beam installation for commercial, regeneration, rail and hospital projects, as well as residential work.
We also offer a structural concrete application service, using structural lightweight concrete to provide good strength-to-weight ratios for different structural components — resulting in a reduced volume of concrete and smaller elements, less reinforcing, lower cost, and better insulation and energy conservation. Concrete is applied by pump, with pump locations chosen to minimise vertical fall and adjustments made to air content, aggregate content and slump to prevent slump loss during placement. Structural concrete is used to manufacture roofs, elevated floors, beams, columns and walls for both commercial and residential structures, including custom-made panels for door and window openings, poured in place or pre-panelised for improved durability.
Our bricklaying service covers the complete range of masonry and block work for commercial and residential customers — home extensions, general building, brick letterbox installation, limestone retaining walls, garden walls and concrete block walls, including dividing block walls and lift shafts. Customers can choose from different brickwork patterns, including decorative approaches such as Basket and Herringbone Bond, popular for walkways and driveways, along with Dutch, English, Scottish and American Bond, with the Scottish and American Bond patterns mostly used for garden walls and other decorative elements. Our clients range from private healthcare companies, schools and corporate businesses to major retailers, and we work on small and large-scale industrial projects including factories, warehouses and office blocks.
First-fix carpentry covers the structural timber work behind a project — timber partition walls, shuttering for concrete, floor joists, roof studs and wall studding, fitting the staircase early enough to allow access to upper floors during construction, and roofing including lean-to, trussed or multi-pitched roofs.
First fix runs from the foundation to the point plasterers start work — after that, plumbers fix the pipes and engineers lay the cables, before second fix carpentry takes over. Our carpenters handle the finishing work, including fixing floorboards, architrave and skirting, fitting window frames, doors and door linings in hardwood, softwood or flush finishes, and manufacturing, supplying and installing bespoke furniture — library units, made-to-measure bookcases, coffee tables, school furniture, shop counters and fitted display units — along with kitchen cupboards made from hickory, maple, cherry and other wood species, or fitting cupboards you've already bought.
What's included
- Steel beam installation
- Load-bearing wall removal
- Structural lightweight concrete application
- Bricklaying and block work, including decorative patterns
- First and second-fix carpentry, including bespoke furniture
- Staircases, handrails and balustrading
- 10-year guarantee on structural work
Our process
- 1
Structural assessment
We assess the opening, wall or structure involved and discuss the scope.
- 2
Engineer coordination
Coordinated with a structural engineer where calculations are required.
- 3
Structural work
Steel beams, structural concrete, brickwork or first-fix carpentry carried out on site.
- 4
Sign-off
Completed to a finished structural standard, with a 10-year guarantee.
Frequently asked questions
Are you structural builders working across London?
Yes. TopBuild UK is an established building and structural contractor serving London and locations within the M25. Our work includes structural steel, load-bearing wall removal, extensions, loft conversions and wider property alterations.
Can you remove a load-bearing wall?
Yes — we install steel beams in place of load-bearing walls as part of remodelling and extension projects, working to a structural engineer's calculations.
Do you install RSJs in London?
Yes. RSJ is a commonly used term for a rolled steel joist, and we install structural steel beams for openings, load-bearing wall removal, extensions and loft conversions across London and within the M25, working to the structural engineer's calculations.
Do extensions need structural steel beams?
Many extensions need steel beams or a steel frame to support existing walls, upper floors or wide new openings. The structural engineer specifies the required steelwork, and we coordinate its installation with the wider build.
Why use steel beams instead of wood?
Steel is a more efficient and affordable material than wood, with better support potential, and it's resistant to pest infestation, weathering and rot — including termites.
Do you do bricklaying for lift shafts or block walls?
Yes, our bricklaying service includes masonry and block work for dividing walls and lift shafts on commercial and residential projects.
Can you lay decorative brick patterns?
Yes — we lay Basket and Herringbone Bond patterns, popular for walkways and driveways, as well as Dutch, English, Scottish and American Bond, with Scottish and American Bond mostly used for garden walls and other decorative elements.
Is structural work guaranteed?
Yes, all structural work carries a 10-year guarantee.
Our work
Recent structural works




Projects featuring structural steelwork
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10-year structural guarantee · No obligation

