Start with the reason this software should exist, not a list of screens. What kind of user will use this, with what frequency, and what does the process look like without it? An estimator who grasps the purpose can propose an alternative that costs less; one who only sees a list of screens prices the list as written.

Set out the scope as short scenarios: who does what, and what happens next. Every bit as useful, write down what you are not building. A written out-of-scope list removes more argument at delivery time than any other single page. Mark too which parts are firm and which are still under discussion — the difference between livewire and vue changes the price, symfony ecommerce and pretending everything is fixed helps no one.

Set out your constraints. The list covers the platforms and enterprise ai development services involved, laravel development services the data you already hold and its condition, security and compliance rules, expected load, supported browsers or devices and infrastructure that is already decided. Where a date is genuinely fixed, say what depends on it: an experienced team is usually able to resequence the work to protect it, provided they hear about it early.

Write down what done means for each item. Acceptance criteria do not need any formal notation: a short paragraph stating what a user should be able to do is sufficient. That one addition shortens the sign-off process dramatically and eliminates the usual argument at handover.

To close, say what you expect back. Require an itemised estimate, the assumptions used, whatever the team considers risky and a range rather than a single figure. Treat a wide range as a signal about the brief: it usually points to the part of the brief that needs work. At that point tighten that section and request a revised number — the next version is much more reliable.