Fixed Price vs Time & Materials vs Dedicated Team: Which Contract Fits Your Project?

Two companies can quote the same project and both be fair, because they are pricing different risks. The contract model decides who carries the risk when scope changes, how quickly you can change direction, and how much you pay for certainty. There are three common models: fixed price, time and materials, and a dedicated team.

Quick answer

• Fixed price suits small, well-defined projects where the scope will not change.
• Time and materials suits products where you expect to learn and adjust as you go.
• Dedicated team suits ongoing product development that will last many months.
• Many projects combine them: a fixed-price discovery phase, then time and materials or a dedicated team for the build.

Fixed price

You agree a scope, a price and a deadline before work starts. The vendor carries the risk of underestimating.

• Good for: marketing websites, a clearly specified MVP, an integration with a known API, a fixed-scope redesign.
• Strengths: a known budget, simple approvals, clear deliverables.
• Watch out for: every change needs a change request and a new quote. Vendors add a buffer for risk, so you pay for certainty. If the scope is vague, the quote is either inflated or the delivered product is thinner than you expected.

Fixed price only works with a clear scope. Our guide on writing a requirements document shows what to prepare.

Time and materials

You pay for the hours actually worked, usually in two-week sprints, at agreed rates. You decide priorities as you go.

• Good for: new products, AI features, projects that depend on user feedback, modernisation of old systems where surprises are likely.
• Strengths: flexibility, no change request overhead, you only pay for what is built.
• Watch out for: the total cost is not fixed. You need someone on your side making priority decisions every sprint, and clear reporting from the vendor.

To keep it under control, ask for an estimate range up front, a cap per sprint or per month, a demo every sprint, and a written log of hours by feature.

Dedicated team

You reserve a team, for example two developers, a tester and a part-time project lead, for a monthly fee. They work only on your product, inside your process.

• Good for: SaaS products, growing platforms and companies that need more engineering capacity than they can hire.
• Strengths: the team builds deep product knowledge, the monthly cost is predictable, and you can add or remove people as needs change.
• Watch out for: you need a steady backlog and a product owner. An idle dedicated team is the most expensive kind.

For a deeper comparison with hiring, see in-house developers vs a dedicated team.

Side-by-side

• Budget certainty: highest with fixed price, medium with a dedicated team (fixed monthly cost), lowest with time and materials.
• Flexibility to change scope: lowest with fixed price, high with time and materials and dedicated teams.
• Your time required: lowest with fixed price, highest with a dedicated team.
• Speed to start: slowest with fixed price, because the scope must be finished first.

A practical combination

1. Discovery, fixed price: two to four weeks to agree scope, design key screens and estimate the build.
2. First release: fixed price if the scope is now firm, or time and materials with a cap if you expect changes.
3. After launch: a dedicated team or a maintenance retainer, depending on how fast the product is growing.

Contract terms to check in every model

• You own the source code and intellectual property, and it lives in your repository.
• Hosting, app store and third-party accounts are in your company's name.
• Warranty period for defects after delivery.
• Notice period and a handover plan if you end the contract.
• Confidentiality, and an NDA if needed.

Frequently asked questions

Is fixed price cheaper than time and materials?

Not usually. Vendors add a buffer to fixed-price quotes to cover the risk of underestimating. If the scope is clear and stable, fixed price gives certainty. If you expect changes, time and materials is often cheaper overall because you are not paying for change requests or unused buffer.

Which contract model is best for an MVP?

If the MVP scope is short and firm, fixed price works well. If you expect to adjust features based on early user feedback, time and materials with a monthly cap is usually better. Many teams use a fixed-price discovery phase first, then decide.

Can we switch models during a project?

Yes. A common path is a fixed-price discovery or first release, followed by time and materials or a dedicated team once the product is live. Agree the switch in writing, with rates and notice periods.