CM or GC? How Your Fit-Out Gets Built

Before a single drawing is stamped, you make a decision that quietly governs the whole project: how it gets delivered. The same fit-out, run as a fixed-price job versus a construction-management engagement, can carry very different budgets, risk and pace. Here's how the main models differ — and which tends to fit which kind of interior.

General contractor versus construction manager.

General contractor, fixed price

A general contractor takes a finished design and builds it, coordinating the trades. On a lump-sum (stipulated-price) contract the price is locked: the contractor carries the risk of overruns, and any savings stay with the contractor.

It's the cleanest path when your scope is fully designed and stable and you want pricing risk transferred early. The trade-off is rigidity — once it's signed, changes mean change orders, because a fixed price assumes a fixed design.

Construction management

A construction manager is brought in early, during design, as a professional extension of your team — usually on a fixed fee. Because the CM isn't betting on a lump sum, their interests line up with yours on budget, schedule and quality, and the builder's perspective shapes the design before it's final.

It suits projects that are fast-tracked or phased, where the scope is still evolving, or where you want visible trade pricing and an early, realistic budget. We've run retail builds this way — pricing developed openly across several budget passes, so the client could decide with real numbers in front of them.

That is construction management in general. Ours works one way: a fee while the design and the trade pricing come together, then the construction itself is contracted at a fixed price — never cost-plus, and never a guaranteed maximum.

The hybrids: GMP and design-build.

GMP — the middle ground

A guaranteed maximum price (GMP) is a pricing structure rather than a delivery model: it caps the total, and the contractor absorbs overruns above the cap. It is most often paired with construction management where the manager also takes on the construction work — the arrangement usually called construction manager at risk, written in Canada on CCDC 5B. Whether savings below the cap come back to you is a term of that contract, not something a GMP grants automatically. The appeal is a ceiling without locking the design as hard as a lump sum.

Design-build

Design and construction sit under one contract, so pre-construction and design overlap. The builder is in the room for design decisions — less risk of something beautiful but unbuildable — and accountability is single-point. It tends to suit fit-outs where speed and one point of responsibility matter, like retail with a hard opening date.

Lump sum buys you a fixed number. Construction management buys you visibility while the design is still moving. The right pick depends on how settled your design is.

So which one fits your fit-out?

None of this is a rule — but a few patterns hold up across most interior projects:

• Office TI, fully designed, stable scope — a lump-sum GC is often the cleanest path.
• Fast-track or phased, or you want transparency and an early budget — construction management.
• Lab, medical or MEP-heavy interior where buildability dominates — CM or design-build, to get the builder into design early.
• Retail on a tight opening date — design-build or CM, for speed and single accountability.

The right answer depends on how settled your design is, how much risk you want to hold, and how much you value transparency over a single fixed number. That conversation belongs at the budgeting table, early — Enduro works as both general contractor and construction manager, so it can start with your project, not our preferred contract. You can also browse recent projects to see both models in practice.