Design and Build vs Traditional Contract: Which Suits Your Scheme?

Choosing a procurement route is one of the earliest and most consequential decisions a developer or homeowner makes. In London construction, the two dominant options are design and build and the traditional contract, and each shapes cost certainty, programme and risk differently. With more than 30 years of experience delivering developer schemes and high-end refurbishments across the capital, Berati Construction has worked under both routes, and this guide explains how to decide which suits your scheme.

What Is Design and Build?

Under a design and build contract, a single main contractor takes responsibility for both the design and the construction of your project. You appoint one team, sign one contract and hold one point of accountability from concept to handover. For mid-size developer schemes, anywhere from one to ten houses or multiple flats, new-build or flat conversion, this integrated approach often compresses the programme, because design and site work can overlap rather than run strictly in sequence. It also gives earlier cost certainty, since the contractor prices the scheme as a whole.

How the Traditional Contract Differs

In the traditional route, you appoint a design team, typically an architect and structural engineer, to complete the design before a contractor is engaged to build it. The advantage is control: the client keeps a direct relationship with the designers and can specify every detail before tendering. The trade-off is that design and construction happen consecutively, which usually lengthens the overall programme, and the cost is not fully fixed until the design is complete and tenders return. For heritage-sensitive luxury refurbishments in prime central London, where finishes and conservation detail must be resolved precisely, that control can be worth the extra time.

Which Route Suits Your Scheme?

As a rough and indicative guide, design and build tends to favour developer-led schemes where speed to completion and cost certainty drive returns, while a traditional contract suits projects where bespoke design control is paramount, such as a period townhouse refurbishment with a new basement. Many of our projects blur the line: a design-and-build framework with strong client design input. Schemes such as the Hornsey ten-home new build, the Swindon eight-flat conversion and the Oxford five luxury flats show how a single accountable contractor can absorb design coordination without diluting quality. Every scheme is different, so we always recommend a site-specific quote rather than relying on generic figures.

Why the Contractor Matters More Than the Route

Whichever route you choose, the contractor's competence and accreditations underpin the result. Berati holds ConstructionLine Gold, CHAS, NHBC, Gas Safe and SSIP accreditation, and our experience spans residential, commercial construction and complex basement works, from the Beaumont Rise NHS care home to the Zedwell Underground Hotel at Park Lane. A capable design and build partner removes the risk of design and construction teams blaming one another when problems arise, which is often where cost and delay creep into a scheme.

Whether you are weighing design and build against a traditional contract, or you simply want an experienced team to guide the decision, Berati Construction can help. Explore our services, browse our past projects and specialist basement work, or learn more about us. When you are ready, get in touch for a site-specific quote.