RCB Design & Build
London's A2Z
Principal Contractor.
Residential. Commercial. Bespoke. One team. One process. One accountable route from concept to completion and aftercare.
Nothing impossible.
25+
Years Experience
60yr
Combined Management
5★
Google Reviews
Who We Are
RCB stands for something different.
Residential. Commercial. Bespoke.
There is no “one-size-fits-all” in construction. Every project is different. Every client is different. That's why RCB operates across all three disciplines — delivering the right expertise for your specific project.
As your A2Z Principal Contractor, we are the single point of accountability from your first conversation through to aftercare. We handle design, planning, structural coordination, procurement, build and handover — so you don't have to coordinate different companies and different trades.
Nothing impossible.
Every project starts with a conversation.
Your Concerns
We understand why clients hesitate.
"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.
What We Do
Full-service construction expertise.
From a single structural beam to a complete house rebuild — RCB has the expertise, the team and the process to deliver it properly.
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 RCBPortfolio
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
*Images shown are representative. Real project photos available on request.
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 RCB
What makes RCB different.
One accountable team
No finger-pointing between trades. RCB is the single point of accountability from day one to handover.
Transparent estimating
Detailed scope of works. Clear line-item costs. No hidden extras after work starts.
Project management included
We manage every trade, every supplier, every inspection. You don't need to manage your builder.
25+ years combined experience
60 years of senior management experience across residential, commercial and bespoke projects.
Weekly updates & site visibility
Regular progress reports, site photos and CCTV access. You always know what's happening.
Before, during and aftercare
We support you before planning, through delivery and after handover. Full lifecycle service.
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 access during build where available
- 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.
Ready to start your project?
Book a project review and speak with the RCB team. No pressure, no obligation — just a clear, honest conversation about your project.