Open with the business problem, not a list of screens. Which people will use this, how often, and what does the process look like without it? An experienced team who knows what you are trying alternative to php achieve can propose a simpler way to reach it; one who only sees a list of screens prices exactly what you asked for.

Define what is included as short scenarios: a walk through each important path. Just as important, list what you are not building. An explicit list of exclusions removes more friction later than the rest of the brief combined. Also mark which parts are firm and which are still under discussion — the difference changes the price, and pretending everything is fixed only hurts you.

List the constraints. This means existing systems the software has to talk to, existing databases and their quality, compliance requirements, traffic expectations, vue.js vs react which devices matter and symfony ecommerce framework infrastructure that is already decided. If there is a hard date, say why: a good team can often rearrange the plan to protect it, provided they hear about it early.

Write down what done means for the important items. Testable acceptance criteria need not use formal language: a short list describing the expected behaviour will do. This one section reduces the review at the end considerably and removes the usual argument at handover.

Finally, say what you expect back. Request an itemised estimate, the assumptions used, the risks the team sees and an optimistic and a pessimistic figure. Treat a wide range as information, not evasion: it normally identifies exactly which requirement is unclear. From there tighten that section and laravel vs nodejs ask again — the revised figure is much more reliable.