The direct answer
Fixed price works when the scope is fully defined before the project starts. Time and materials works when the scope is likely to evolve. Most website builds suit fixed price. Most ongoing support arrangements suit time and materials. Here is how each model works and what it means for you as a client.
How fixed price works
In a fixed-price engagement, the studio agrees to deliver a defined scope for a set fee. The scope is documented before the project starts: this many pages, this many CMS templates, these integrations, this number of revision rounds. Anything outside that scope is priced as a change request.
The benefit for the client is cost certainty. You know what you are spending before the project is approved. The risk is that the scope needs to be genuinely complete at the start. Vague scoping on a fixed-price project leads to either a narrow interpretation by the studio or change requests that erode the apparent price advantage.
How time and materials works
In a time-and-materials engagement, the studio bills for the actual hours worked at an agreed rate. The client has flexibility to change direction, add pages or adjust scope as the project develops. There is no fixed ceiling on cost.
This model suits projects where scope genuinely cannot be defined upfront, such as a complex integration where requirements will only become clear during build, or an ongoing retainer where work varies month to month.
The risk is cost uncertainty. A project that starts without a defined scope and bills by the hour can run meaningfully over a client's mental budget, even if every hour billed was legitimate.
The hybrid approach
Many website projects use a hybrid. The discovery and strategy phase is billed time and materials, because the scope for the rest of the project cannot be accurately defined until discovery is complete. Design and build are then fixed price, once the scope is clear. This is often the most sensible arrangement for a project where the destination is clear but the route is still being worked out.
Change requests on fixed-price projects
Any fixed-price project will have a mechanism for changes. If something outside the agreed scope is needed, the studio should provide a written change order with the cost and timeline impact before proceeding. A studio that absorbs scope changes silently without raising change orders either has a very wide scope definition or is building the cost difference into the next project.
Frequently asked questions
Which pricing model is more common for website builds?
Fixed price is more common for defined website projects. Time and materials is more common for ongoing support retainers and for discovery phases where the output determines the scope of subsequent work.
How do I know if my project is defined enough for fixed price?
If you can describe the site clearly enough that two different studios would quote a similar scope, it is probably defined enough for fixed price. If you are still unclear about the number of pages, the functionality required or the integrations needed, time-and-materials discovery first is the more honest approach.
What happens when I want changes on a fixed-price project?
Any change to the agreed scope should trigger a formal change request with a quoted cost and timeline impact. Minor adjustments within revision rounds are typically included. New pages, new functionality or significant redesigns of approved work are typically out of scope and priced separately.
Can I switch pricing models mid-project?
It is possible but requires a formal agreement reset. The cleaner approach is to choose the right model at the start of each phase. Discovery on time and materials, build on fixed price, support on time and materials is a common and sensible structure.
