Checkatrade 9.96/10 · 114 Reviews
Your cramped kitchen,
open-plan in 12 weeks.
114 reviews · 9.96/10 on Checkatrade · Fixed price guarantee · CCTV on every site.
60+
Years combined experience
Fixed
Price. No surprises.
114
Reviews · 9.96/10
5.0 · 114 reviews
25yr
Structural Warranty
Up to 25 year structural warranty on all major works
Fixed
Price Guarantee
The price we quote is the price you pay. No hidden costs.
20+
Years Experience
Over two decades of residential & commercial construction
CCTV
On Every Site
Live cameras on every project — watch from anywhere, anytime
A2Z
Under One Roof
Design, planning, build & aftercare — one accountable team
Why RCB Group
One team. Every trade. Nothing left to chance.
Residential. Commercial. Bespoke. + Public Sector.
Extensions, lofts, refurbishments. HMOs, restaurants, offices. Schools, housing associations, council works. RCB is a group of companies covering every sector — not a one-trade operation.
One principal contractor. One contract. Design, planning, structural coordination, procurement, build and handover — all under one accountable team. You don't chase trades. You don't coordinate suppliers. You tell us what you need. We handle it.
Nothing impossible.
Every project starts with a conversation.
We Get It
You've heard it all before. Here's why this is different.
"I've been let down by a builder before."
RCB is a principal contractor — one accountable team, not a string of disconnected trades. You deal with us from start to finish.
"The final price was nothing like the quote."
We provide a detailed scope of works with itemised costs. Change requests are documented and agreed before they happen. No surprises.
"I don't know how to find a trustworthy contractor."
25+ years of experience, fully insured, and a proven track record across hundreds of London projects. Our reviews speak for themselves.
"I don't know where to start with planning."
We guide you through every step — planning permission, permitted development, Building Regulations, structural requirements. We handle the coordination.
"My project has stalled or gone wrong."
We offer project rescue. We assess what has happened, advise on next steps, and take over with full accountability.
"I can't tell if the builder really knows what they're doing."
Weekly site updates, photo documentation, site CCTV access and detailed progress reports. Complete transparency throughout.
Services
Residential. Commercial. Bespoke. Public Sector.
Extensions, lofts, refurbishments, HMOs, restaurants, offices, schools, housing association works. One team handles it all — A to Z.
Design & Build
Full concept-to-completion service. Architecture, planning, construction — one accountable team.
House Extensions
Single-storey, double-storey, side and wrap-around extensions designed and built to the highest standard.
Loft Conversions
Transform your loft into a bedroom, bathroom, office or studio. Full structural design and build.
Full Refurbishments
Whole-house refurbishments, HMO conversions, fit-outs. Structural reconfigurations and complete renovations.
Kitchen Extensions
Open-plan kitchen extensions, knock-throughs and bespoke kitchen renovations with structural expertise.
Structural Works
Steel beam installation, load-bearing wall removal, underpinning and all structural alterations.
Commercial
Office fit-outs, retail spaces, co-working environments and commercial refurbishments across London.
Landlords & Investors
Fast, cost-controlled refurbishments for buy-to-let, HMO, and investment portfolios.
How We Work
One clear process. Every time.
From your first enquiry to aftercare — a structured, accountable process that keeps you informed and in control.
Concept & Consultation
We review your project, site conditions and aspirations. We assess planning potential, feasibility and provide an honest scope and cost indication.
Design & Planning
Our team develops full architectural designs, planning applications where needed, structural calculations and Building Regulations submissions.
Estimate & Agreement
We produce a detailed, transparent estimate. No vague lump sums — clear scope of works, clear costs, clear programme.
Build & Delivery
RCB manages every trade on site. Weekly updates, site CCTV access, photo documentation and project management throughout.
Handover & Aftercare
Thorough snagging, sign-off documentation, Building Control completion certificate and aftercare support. Your project, completed properly.
Client Types
Which best describes you?
Every client journey is different. Find yours and see how RCB can help.
Homeowner with drawings
You have plans ready. We review them, price accurately and build to spec.
Send drawings for reviewHomeowner with an idea
You know what you want but haven't started. We take you from idea to planning to build.
Book a project reviewLandlord / Investor
Refurbishments, HMO conversions, portfolio upgrades. Cost-controlled and professionally managed.
Discuss your portfolioProperty Developer
New builds, development fit-outs, design and build from planning to completion.
Request development reviewProject rescue
Problems with a previous builder? We assess, advise and take over projects that need rescuing.
Request rescue reviewArchitect / Designer
We work alongside architects and designers as a trusted principal contractor.
Partner with RCBSchool / Public Sector
CHAS accredited, DBS checked, Constructionline verified. Term-time and holiday scheduling.
See how we work with schoolsFirst-time renovator
Never hired a contractor before? We guide you through every step — no jargon, no surprises.
Start hereOverseas property owner
Property in London, you are abroad. CCTV, WhatsApp updates, full project management remotely.
See how it worksPortfolio
Selected projects.
Full House Refurbishment
East London
Rear Extension & Kitchen
South London
Loft Conversion — Dormer
North London
HMO Conversion & Fit-Out
West London
Side Return Extension
Surrey
Design & Build — New Interior
Essex
Want to see more? We can arrange a visit to a current or recently completed project.
Client Reviews
Rated Excellent on Google.
“Professional company from start to finish. The team guided us through planning, handled all coordination and delivered exactly what was promised. Highly recommend RCB for any construction project.”
Sandy Parmar
September 2024 · Google Review
“We are 75% through a full house renovation and cannot be more pleased. The quality of workmanship is exceptional and the team communicates brilliantly throughout every stage.”
Camille Hirons
February 2024 · Google Review
“Very thorough and professional. Clear process, no hidden costs, and the project finished on time. Exactly what you want from a design and build contractor.”
Jeremy Li
March 2024 · Google Review
“Quality workmanship, no hidden costs, completed on time. The RCB team were professional throughout and I am delighted with the result. Would not hesitate to recommend.”
Adrian P
September 2024 · Google Review
Why Clients Choose Us
The things your last builder probably didn't do.
Fixed price — no surprises
Most builders quote low, then add extras mid-build. The price we quote is the price you pay. Every item scoped, every cost agreed before we start.
Line-by-line scope before you commit
Other builders hand you a lump sum and hope you don't ask questions. We give you a detailed scope of works — room by room, item by item — before a single brick moves.
CCTV on every site
Watch your project from anywhere. Live cameras, automatic progress photos, time-lapse documentation. Whether you're at work, abroad, or managing multiple sites.
Weekly progress reports
You shouldn't have to chase your builder for updates. We send structured reports with photos every week — whether you ask or not.
Up to 25 year structural warranty
Most builders offer 1-2 years. Our major structural works come with up to 25 year warranty. That's how confident we are in the work.
One team, one contract
No finger-pointing between trades. No coordinating your own plumber, electrician, plasterer. RCB manages everything — A to Z — under one accountable team.
Design, redesign & build
Got plans? We price them. Just an idea? We design it. Existing plans need rethinking? We redesign. Not just builders — a full design and build partner.
Residential. Commercial. Bespoke.
Extensions, lofts, refurbishments. HMOs, restaurants, offices. Schools, housing associations. RCB is a group — covering every sector.
Finance available
Spread the cost of your project with flexible payment plans. Ask during your free consultation — we make it work for your budget.
Search our name. Nothing to find.
Over 20 years, hundreds of projects, zero complaints. 114 verified reviews at 9.96/10 on Checkatrade. Our record is clean because our work is right.
Technology-Backed
Transparency is built into how we work.
We use technology to give you full visibility over your project — not just a phone call every few weeks. From our internal project management and estimating platform to site CCTV access and regular documentation, you always know what is happening.
- Weekly written progress updates
- Site photo and video documentation
- CCTV on every site — watch progress from anywhere
- Detailed scope of works before work starts
- Itemised estimates — no lump sum guesswork
- Change request documentation and approval
- Building Control inspection coordination
- Handover pack and aftercare support
Powered by Rankitt
RCB uses its proprietary Rankitt platform to manage estimating, scope of works, project delivery and client communication — giving you professional, structured management on every project.
FAQs
Common questions.
What does A2Z Principal Contractor mean?
It means RCB manages every aspect of your project — from initial concept and design through planning, procurement, construction and final handover. You deal with one team, one contract and one point of accountability throughout.
Do I need planning permission for an extension or loft conversion?
Many extensions and loft conversions fall under Permitted Development and do not require planning permission, but this depends on your property, location and the scale of works. We assess this at your consultation and guide you through the correct route.
Can you provide design and architectural drawings?
Yes. RCB coordinates full architectural design, structural calculations, planning drawings and Building Regulations submissions as part of our design and build service.
How do you handle cost management and avoid overruns?
We provide a detailed scope of works and itemised estimate before any work starts. We manage procurement and subcontractors directly. Change requests are documented and agreed before they are carried out — no surprises.
I have had a bad experience with a previous builder. Can you help?
Yes. We offer project rescue services — we assess the current state of the project, identify what has and hasn't been done correctly, and take over management with full accountability. Contact us for a confidential review.
What areas do you cover?
RCB primarily works across London and the surrounding areas including Essex, Kent, Surrey and Hertfordshire. Contact us to confirm coverage for your specific postcode.
Do you offer a structural warranty?
Yes. RCB provides up to a 25 year structural warranty on major structural works including extensions, loft conversions and structural alterations. This is significantly longer than the typical 1-2 year warranty offered by most builders.
Is the price you quote the final price?
Yes. RCB operates a fixed price guarantee. The detailed estimate we provide is the price you pay. If you request changes during the project, these are documented, priced and agreed before they proceed — but the original scope price does not change.
Site Visibility
Watch your project from anywhere.
Most builders send you a photo once a week if you're lucky. We install CCTV on every project so you can see what's happening in real time — whether you're at work, abroad, or managing multiple sites.
We use the same cameras to supervise our teams remotely, take progress photos automatically, and document every stage of the build. Full transparency. No surprises.
Homeowners at work
Watch your extension go up from your desk. No days off to "check on the builders."
Homeowners away
Abroad, relocated, or staying elsewhere during works. Full visibility without a single visit.
Property investors
Property in London, you're in Manchester or Dubai. See every stage without travelling.
Developers
Multiple sites, one screen. Check progress across all your projects remotely.
Housing associations
Visual proof of progress for compliance reporting and accountability.
Insurance works
Full before, during and after documentation. Evidence trail for insurers.
Site CCTV
On every RCB project. Watch from anywhere.
Scope Before Price
We never send a number without context. You see the full scope of works first — room by room, item by item. Only when you confirm the scope do we add pricing. No surprises.
Finance Available
Spread the cost of your project with flexible finance options. Ask about our payment plans during your free consultation.
See what's possible with your property.
Tell us what you're thinking. We'll tell you what it takes. No pressure, no obligation — just clarity.