RCB Design and Build is a London-based principal contractor and design-and-build delivery partner specialising in residential extensions, loft conversions, refurbishments, and structural alterations across Greater London and the surrounding counties.
We operate as a full A-to-Z delivery partner rather than a trade-only contractor, taking responsibility for coordinating design, pre-construction planning, structural and specialist input, compliance, procurement, and site delivery from a single point of contact. Our clients benefit from a structured, professional process that gives them clarity, accountability, and confidence from the earliest stages of a project through to final handover.
Our core services include rear extensions, side return extensions, double-storey extensions, and wrap-around extensions for London terraced and semi-detached houses. We deliver dormer, hip-to-gable, and Velux loft conversions that add bedrooms, bathrooms, and living space within the existing roof structure. Our refurbishment service covers full house refurbishments, flat refurbishments, kitchen renovations, bathroom renovations, and open-plan ground-floor transformations. We also carry out structural alterations including steel beam installation, chimney breast removal, and party wall works.
As principal contractor, we take legal responsibility for health and safety on site under CDM 2015, coordinating our supply chain against the Construction Phase Plan and ensuring every project is delivered with the same discipline and accountability we apply to quality and programme management.
Our pre-construction process distinguishes us from contractors who simply quote and build. Before any work starts, we work with clients to develop a clear scope of works, identify all relevant planning and regulatory requirements, coordinate structural engineering input, and produce a realistic programme and commercial breakdown. This investment at the front end of the project significantly reduces surprises during construction.
We are members of the Federation of Master Builders and hold TrustMark accreditation. We are listed on Checkatrade and TrustATrader, where clients can read reviews from completed projects.
If you are planning an extension, loft conversion, or refurbishment in London and want to work with a principal contractor who will manage the process professionally from start to finish, we would be delighted to discuss your project. Contact us through our website at rcbgroup.co.uk or call us on 07359 872594.