Choosing How to Build It

An owner sitting down to plan a new medical office building faces a decision most people never realize gets made this early: not what the building looks like, but how the whole project gets structured. Before an architect is even hired, before a single bid goes out, the owner has to choose a project delivery method, and that one choice quietly determines who's liable for what, how much price certainty the owner gets, and how fast the project can realistically move. The traditional default is Design-Bid-Build: the owner hires an architect to complete the design first, bids that finished design out to general contractors, and then hires the winning contractor to build it, three separate, sequential contracts rather than one combined one. It's still the most common method precisely because the design is fully finished before pricing starts, giving the owner real price certainty from a competitive bid. The tradeoff is time: nothing about construction can start until design is completely done, stretching the overall schedule longer than faster-moving alternatives.

That sequential structure has a real consequence beyond just timeline. Under Design-Bid-Build, the architect and the general contractor each hold a separate contract with the owner, and each is liable to the owner only for their own piece: a design error is the architect's problem, a construction defect is the contractor's, and when something goes wrong at the boundary between the two, whose drawing was ambiguous, whose installation didn't match the intent, the owner can end up mediating a dispute between two parties who each have every incentive to point at the other. Design-Build exists partly to close that gap. A single design-builder holds one contract covering both design and construction, which means the owner has exactly one party liable, for the whole result, not two parties each defending their own half. That single point of accountability can genuinely speed up delivery, since design and construction can overlap instead of waiting on each other in sequence, but it also means the owner gives up the built-in check of an independent architect reviewing the contractor's work on their behalf.

A third structure tries to blend the two. Under CM at Risk, a construction manager gets hired early, during design, purely to provide cost estimating and constructability input, essentially the design-build advantage of early contractor involvement, while the owner still hires the architect separately, keeping the independent design check Design-Build gives up. Once design is far enough along, that same CM converts into the general contractor, taking on the job at a Guaranteed Maximum Price (GMP), a cost ceiling they now guarantee, at risk, meaning any cost beyond that ceiling comes out of their own margin rather than the owner's pocket. There's a real catch worth understanding here: a GMP set before the design is actually complete is really a guess dressed up as a guarantee. If real gaps remain in the design at the moment the GMP locks in, those gaps become the contractor's financial problem to absorb, which is exactly why a CM's early cost input during design matters so much, it's their best chance to catch a gap before it becomes their own liability.

It's worth untangling a common point of confusion here: delivery method and contract pricing type are two different decisions, not one. Delivery method decides who holds which contract and when, Design-Bid-Build, Design-Build, CM at Risk. Contract pricing type decides how the risk of cost overruns actually gets split between the owner and the contractor, regardless of which delivery method got chosen. A lump sum contract has the contractor agree to one fixed total price for a defined scope, putting the risk of an inaccurate estimate on the contractor. A cost-plus contract instead has the owner pay actual documented costs plus a fee, shifting that risk onto the owner instead, often used when the scope genuinely isn't fully defined yet or speed matters more than price certainty. A GMP, as it happens, is really a cost-plus contract with a ceiling attached: the owner gets cost-plus flexibility up to a point, and the contractor absorbs anything past it. A handful of further variations exist for specific situations. Integrated Project Delivery has the owner, architect, and key contractors sign one shared multi-party contract with pooled risk and reward, explicitly designed to remove the adversarial incentives Design-Bid-Build can create. Bridging splits the difference on design control: an owner-hired designer develops the project partway, then a design-build team takes it the rest of the way. And on the ownership side, some owners skip a single general contractor altogether through multiple prime contracting, contracting directly with several primes and taking on the coordination burden themselves.

Go back to that medical office owner. There's no universally "best" delivery method, only a best fit for what that specific owner actually needs most: Design-Bid-Build for maximum price certainty and a fully baked design before committing; Design-Build for speed and a single point of accountability; CM at Risk for an owner who wants early cost feedback but isn't ready to give up an independent architect. Every one of these tradeoffs traces back to the same two questions: who's liable if something goes wrong, and how much of the cost risk is the owner willing to hold onto themselves. This is exactly the decision a Owner's Representative helps an owner actually work through, since it's one of the highest-stakes calls made on a project, often before most of the eventual project team is even hired. And once a delivery method that involves early contractor input gets chosen, CM at Risk especially, it's a Preconstruction Manager who actually runs that early estimating and constructability work the whole approach depends on. If you remember one thing from this lesson, make it this: how a project gets delivered isn't a technical formality decided by lawyers after the real decisions are made. It's one of the earliest, highest-leverage decisions on the entire project, and it quietly sets who's accountable for what long before anyone breaks ground.