Projects & Portfolio
Extensions, loft conversions, refurbishments, commercial fit-outs and structural works — delivered properly across London, Kent and Essex. Browse a selection of the work we do.
£2M+
In delivered projects
60+ years
Combined experience
114
Verified reviews
9.96/10
Checkatrade rating
Our Work
Filter by project type to see how we approach each kind of work. Every project is managed under one principal contractor — from first survey to final handover.
ExtensionsSingle-Storey Rear Extension
£45,000 – £55,000
Single-storey rear extension opening up a tired galley kitchen into a bright open-plan family space with bi-fold doors and a roof lantern.
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ExtensionsSide & Rear Wrap-Around
£75,000 – £90,000
Full wrap-around extension reconfiguring the ground floor of a 1930s semi, with structural steel, underfloor heating and a new utility room.
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ExtensionsDouble-Storey Side Extension
£95,000 – £120,000
Two-storey side extension adding a fourth bedroom, en-suite and enlarged kitchen-diner, matched to the existing brickwork and roofline.
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Loft ConversionsRear Dormer Loft
£42,000 – £52,000
Rear dormer loft conversion creating a generous master suite with en-suite bathroom and built-in storage, fully Building Regulations compliant.
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Loft ConversionsHip-to-Gable & Dormer
£55,000 – £68,000
Hip-to-gable conversion with rear dormer, adding two bedrooms and a family bathroom to a semi-detached property with a new staircase.
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Loft ConversionsMansard Loft
£70,000 – £85,000
Conservation-area mansard loft conversion delivering maximum head height and floor area across a full top-floor master suite and study.
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RefurbishmentsWhole-House Refurbishment
£110,000 – £140,000
Complete gut and refurbishment including rewire, replumb, new heating, two bathrooms, kitchen, internal reconfiguration and full redecoration.
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RefurbishmentsHeritage Refurbishment
£85,000 – £105,000
Sensitive renovation of an Edwardian home — restored cornicing and sash windows alongside a fully modernised kitchen and bathrooms.
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RefurbishmentsInvestor Refurbishment
£38,000 – £48,000
Fast-turnaround landlord refurbishment to a rental-ready standard — new kitchen, bathroom, flooring, decoration and EICR-compliant electrics.
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CommercialCommercial Fit-Out
£130,000 – £160,000
Category-B office fit-out including partitions, meeting pods, kitchenette, data cabling and full mechanical and electrical coordination.
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CommercialCommercial Refurbishment
£60,000 – £75,000
Shopfront and interior refurbishment for a high-street retail unit, delivered out-of-hours to minimise disruption to neighbouring businesses.
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StructuralStructural Works
£48,000 – £62,000
Load-bearing wall removal with structural steel installation and partial underpinning to stabilise foundations ahead of an open-plan reconfiguration.
View ProjectTransformations
The difference proper planning and execution makes. An interactive before/after slider is coming soon — for now, see the transformation side by side.
BeforeAfterKitchen Extension — Bromley
BeforeAfterFull Refurbishment — Bexley
In Their Words
“From the first site visit to handover, RCB ran our extension like clockwork. The weekly updates meant we always knew exactly where we stood — and the finish exceeded what we’d hoped for.”
Sarah & James M.
Rear Extension · Bromley
“Our loft conversion added a whole bedroom and en-suite without a single nasty surprise on cost. The team were tidy, polite and genuinely cared about getting the details right.”
Priya K.
Dormer Loft Conversion · Greenwich
“We’d been let down by a previous builder and were nervous. RCB took over, gave us a clear schedule and delivered our full refurbishment on time. Completely restored our faith.”
David & Helen R.
Full House Refurbishment · Orpington
“As a landlord I needed a fast, reliable turnaround. RCB had the unit rental-ready in nine weeks to a standard well above what I expected for the budget.”
Michael T.
Buy-to-Let Refurbishment · Sidcup
Questions
Our portfolio showcases the types of projects RCB delivers across London and the surrounding counties — extensions, loft conversions, refurbishments, commercial fit-outs and structural works. We are continually adding photography and detail from completed projects. For verified client feedback, see our reviews page.
RCB delivers single and double-storey extensions, side-return and wrap-around extensions, dormer, hip-to-gable and mansard loft conversions, full and partial refurbishments, structural works including steel and underpinning, and commercial fit-outs and refurbishments.
Costs vary by size, specification and location. As a guide, loft conversions typically start from around £42,000, single-storey extensions from £45,000, and full refurbishments from £85,000. Every RCB project is quoted with a detailed, itemised estimate — no lump sums.
A single-storey extension typically takes 10–18 weeks on site, a loft conversion 10–14 weeks, and a full house refurbishment 20–24 weeks. Pre-construction — design, planning and Building Regulations — runs alongside or ahead of this depending on the project.
RCB delivers projects across London, Kent and Essex, including Bromley, Greenwich, Lewisham, Bexley, Orpington and the surrounding areas. Visit our Areas We Cover page to confirm coverage for your location.
Book a free project review or send us your drawings for an estimate. We will assess your requirements, talk you through the options and provide a clear, itemised quote with no obligation.
Tell us what you're planning. We'll tell you what it takes — with a clear, itemised estimate and no obligation.
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RCB Project Assistant
A2Z Principal Contractor · London
