Time and materials is the safer structure for the contractor and fixed price is what most clients demand, which is exactly the problem. Under T&M you bill weekly for actual hours and materials, so you are never more than a week exposed. Under fixed price you carry every estimating error, every surprise behind the wall, and the full dispute risk on the final draw. Contractors with strong reputations and repeat clients can insist on T&M; everyone else competes on fixed price because clients want a number before they commit.
What T&M actually requires
A retired finance executive who now runs a premium renovation business put it plainly in a contractor forum: his shop bills time and materials with weekly actuals, updated estimates to complete, and one project at a time. His clients accept it because they trust him completely, and they trust him because of decades of reputation and referral. That is the honest prerequisite: T&M is a trust product. If clients are comparing you against three other quotes, the one with a fixed number usually wins.
Why fixed price fails contractors
- Every estimating miss is yours: hidden rot, code surprises, material price spikes
- It rewards the wrong behavior industry-wide: rushing, cheaper materials, unskilled subs, because the margin only survives if the hours stay down
- The final draw carries the dispute: the client already has the finished work, and the last 10 to 50 percent becomes a negotiation
- Change orders turn into arguments about what was "included"
The same finance executive said he has personally torn out three brand-new fixed-price tiled showers, each over $25,000, and a $50,000 deck that was structurally dangerous, with lawyers involved throughout. Fixed price built all of them.
De-risking fixed price when you cannot escape it
If your market forces fixed price, the mitigations are structural:
- More draws, smaller gaps: 4 to 6 payments scaled to each stage's real cost, never equal thirds
- Materials on the client's dime or billed as purchased with markup
- A final draw small enough to walk away from, because collecting it through courts costs more than it is worth
- Contract language tied to substantial completion, not the client's evolving punch list
And the emerging option: the full contract funded upfront into a neutral regulated account, released stage by stage as work is approved. The client gets fixed-price certainty. The contractor gets what T&M provides the trusted veteran: never working ahead of the money. It converts payment security from something you earn over 25 years into something the structure provides on day one.