Is fixed price just T&M with a markup?

The premium buys the risk transfer: if the build overruns, that is our problem, not your budget. You are paying for the ceiling, not for slower typing.

Can we start T&M and switch to fixed later?

You can, but the cleaner version is the reverse: a paid audit or a small fixed milestone first, then a fixed scope on evidence. Switching mid-stream usually means the first months bought learning, not software.

Do you ever work time and materials?

No. Every Trenith engagement is fixed scope. When T&M genuinely fits, for example a mature team with its own backlog discipline, we say so on the call and tell you how to run it well.

What does a change order actually look like?

A short written delta: what changes, what it costs, and what it does to the date, agreed before work continues. No change order, no change. That rule protects both sides.

What if we honestly cannot define the scope yet?

Then neither model is safe. Start with the paid systems audit: one week to a written architecture, a milestone plan, and named risks. Scope after that is real.

Is one model cheaper overall?

For a defined first build, fixed price is usually cheaper once you count the discovery T&M bills as engineering. For a living roadmap with real in-house discipline, T&M avoids paying a risk premium you do not need.

COMPARISON

Fixed Price vs. Time & Materials

Time and materials bills you for effort; fixed price bills you for an outcome. Neither is magic, and each has a situation it fits. This page lays out how the two models behave on real software projects, what each one really costs, and when we would recommend one over the other, including when the honest answer is neither.

Book a scoping callHow fixed price works here

FIXED PRICE

You buy an outcome

Scope, price, and date are written down before work starts, and estimation risk sits with the studio. Changes are possible, but they are priced in writing before anyone continues.

TIME & MATERIALS

You buy effort

TIME & MATERIALS

Mature teams running a living roadmap

Dimension	Fixed price	Time & materials
What you buy	A defined outcome with a written scope	Engineering capacity, billed by the hour
Who carries estimation risk	The studio. Overruns are our problem.	You. Overruns are your invoice.
What changes cost	A written change order, priced before work continues	Nothing visible. Changes simply consume hours.
What a change order looks like	Delta scope, delta price, delta date, signed	Rarely exists. The backlog absorbs the change.
How progress is measured	Milestones against the SOW	Timesheets and burn rate
When it wins	First builds, defined scope, fixed budgets	Mature teams running a living roadmap

WHEN T&M GENUINELY WINS

Time and materials is not a scam. It is the right tool in specific hands, and pretending otherwise would make this page a sales deck.

Mature product teams

You have your own backlog discipline, a PM who says no, and engineers reviewing the work. You are buying capacity, not certainty, and you can smell padding in a timesheet.

Staff augmentation

An engineer joins your team, your rituals, your tickets. That is headcount by another means, and a fixed scope makes no sense for it.

Exploratory spikes

A time-boxed investigation with a written question to answer. Even then, the honest version has a ceiling and a question, not an open meter.

Maintenance streams

Small, continuous work where priorities genuinely shift week to week and both sides actually review the hours.

WHY FIRST BUILDS BLOW UP UNDER T&M

Discovery gets billed as engineering: The vendor learns your domain, your data, and your edge cases on your invoice. That learning is real work. It is also the part a fixed-price studio has to do before quoting, for free.
Scope emerges at hour two hundred: Nobody lied about the estimate, because there never was an estimate, only a rate. The surprise arrives in month three, when the shape of the product finally appears.
The meter has no opinion: Under T&M, a wrong turn costs you money and costs the vendor nothing. Incentives shape outcomes, and this incentive shapes long projects.

Fixed price forces the discovery to happen before the contract instead of during it. That is the entire trick, and it is why we work that way.

FAQ

The questions founders ask when they are choosing a model.

Is fixed price just T&M with a markup?: The premium buys the risk transfer: if the build overruns, that is our problem, not your budget. You are paying for the ceiling, not for slower typing.
Can we start T&M and switch to fixed later?: You can, but the cleaner version is the reverse: a paid audit or a small fixed milestone first, then a fixed scope on evidence. Switching mid-stream usually means the first months bought learning, not software.
Do you ever work time and materials?: No. Every Trenith engagement is fixed scope. When T&M genuinely fits, for example a mature team with its own backlog discipline, we say so on the call and tell you how to run it well.
What does a change order actually look like?: A short written delta: what changes, what it costs, and what it does to the date, agreed before work continues. No change order, no change. That rule protects both sides.
What if we honestly cannot define the scope yet?: Then neither model is safe. Start with the paid systems audit: one week to a written architecture, a milestone plan, and named risks. Scope after that is real.
Is one model cheaper overall?: For a defined first build, fixed price is usually cheaper once you count the discovery T&M bills as engineering. For a living roadmap with real in-house discipline, T&M avoids paying a risk premium you do not need.

Book a 30-minute scoping call.

Fixed scope. Fixed price. Or an honest "not a fit," including the cases where T&M is the right answer for you.

Book a scoping call