Owners planning a construction project often spend months evaluating contractors and almost no time on the delivery method. That's a mistake. The method decides when the builder joins the project, who carries cost risk, and how design decisions get made.

Design-build and CM at Risk are two of the most common alternatives to traditional design-bid-build. Both bring the builder in earlier, which is why they're often compared. They distribute responsibility very differently.

Carrigg Commercial Builders, the Manchester, NH general contractor led by Robert Carrigg, offers design-build and traditional general contracting across New England. This comparison is meant to help owners think through the choice, whichever builder they select.

How Design-Build Works

The owner signs one contract with one entity responsible for both design and construction. Design and construction overlap, so early work like site preparation or long-lead procurement can start while later details are still being finalized. The main benefit is single-point accountability: if a design issue affects buildability, there's no gap between designer and builder for the problem to fall into.

How CM at Risk Works

The owner holds two separate contracts: one with the designer, and one with a construction manager. The construction manager joins during design to provide preconstruction services such as cost estimating, constructability review, and scheduling. At an agreed point, it commits to a guaranteed maximum price (GMP) and takes on the risk of delivering within it. The owner keeps a direct relationship with the design team throughout.

Where They Differ

Design control. CM at Risk leaves the owner in direct contact with the designer. In design-build, the designer typically works within the builder's team, and the owner shapes the design through the project criteria.

Risk allocation. Design-build places design and construction responsibility with one party. Under CM at Risk, design remains a separate relationship, so the owner coordinates between the two.

Timing of cost commitment. Design-build can establish price earlier, based on performance criteria. CM at Risk typically sets the GMP once the design is developed enough to price reliably.

The specifics depend on how each contract is written, so owners should have counsel review the terms.

Matching the Method to the Project

Both methods help in occupied facilities, because builder input during design improves phasing, utility outage planning, and infection control coordination. Owners who want to stay closely involved in design decisions may lean toward CM at Risk. Owners who value unified accountability and a compressed schedule may lean toward design-build.

Procurement rules can decide the question for you. Federal, state, and other public owners are limited in which methods they may use and how they must award them. Confirm what's permitted with your contracting officer or counsel before you commit.

The delivery method decides who carries which risk. Choose it deliberately, before you choose the builder.

What This Means for Owners

Carrigg Commercial Builders works with facility directors and project managers to weigh schedule, budget, design control, and procurement constraints before recommending a path. Bob Carrigg's team in Manchester, NH offers design-build and traditional general contracting for federal, healthcare, and commercial clients throughout New England.

Carrigg Commercial Builders is a Service-Disabled Veteran-Owned Small Business providing commercial construction and general contracting services throughout New England. To connect with Bob Carrigg's team, visit carrigg.com or call (603) 262-4343.