Design-build is generally not more expensive than design-bid-build on a line-item basis, but the more useful question for most commercial owners isn’t which delivery method is cheaper — it’s which one delivers the best total project value for your specific project. The cost answer depends on what you’re optimizing for.
Design-build can save schedule and reduce change orders by collapsing design and construction into one contract — but it also reduces design independence and competitive bidding, which can leave money on the table on the construction side and compromise design quality. Design-bid-build (an independent architect plus a separately contracted GC) typically delivers stronger design outcomes and more competitive construction pricing, with the tradeoff of slightly longer schedules and the owner managing two contracts instead of one.
For most NYC commercial fit-outs — especially office, retail, showroom, and tenant improvement work where design matters — the architect + GC model produces the best total value. Darby works in this model, partnering with the architect from preconstruction onward to bring constructability, cost, and schedule discipline to the design phase, which captures most of the speed and cost benefits people associate with design-build without giving up design independence.
