When planning a building project, one of the most important early decisions is how to structure the professional team and the delivery route. The two most common options for homeowners and developers in the UK are the traditional route, which involves appointing an architect separately and tendering the construction to contractors, and the design-and-build route, which combines design and construction under a single firm.
In the traditional route, you appoint an architect to produce the full design, obtain planning permission, develop the technical drawings, write the specification, and manage the tender process. You then select a contractor based on competitive pricing against those documents, and the architect often continues to administer the contract during construction. This route gives you more design control and the ability to compare like-for-like prices from multiple contractors, but it also puts the coordination responsibility on you as the client, and the interface between architect and contractor can be a source of friction.
In the design-and-build route, a single company takes responsibility for both the design and the construction. This can simplify the client experience significantly. You deal with one point of contact, the design and construction are coordinated from the outset, buildability is considered in the design phase, and cost certainty tends to be achieved earlier in the process. Design-and-build also typically results in faster delivery because design development and early construction activities can overlap.
The traditional route tends to work better for projects where design quality is the paramount concern, where the client has strong aesthetic preferences they want an independent designer to champion, or where the project is complex enough to warrant competitive tendering to control costs. It also suits situations where the client has the time and appetite to manage a multi-party team.
Design-and-build tends to work better for clients who want a simpler experience, who value cost certainty and programme efficiency, who do not have the time or expertise to manage separate design and construction appointments, or whose project is of a type where standard design solutions are appropriate and bespoke architectural input is less critical.
For residential extensions, loft conversions, and refurbishments in London, design-and-build offers significant advantages. The scale of these projects rarely justifies the overhead of a fully traditional procurement route, and the coordination benefits of having design and build under one roof are particularly valuable when working in occupied homes with tight programmes.
RCB Design & Build operates as an integrated design-and-build principal contractor. We can support clients from early concept through to final handover, bringing design awareness, technical knowledge, and delivery experience together in a single service.