Open with the problem you are solving, not a list of screens. Who will use the system, with what frequency, and gpt integration services what happens today? An estimator custom software vs saas who understands the goal can propose a simpler way to reach it; one who only sees the requirements as given will price exactly what you asked for.
Define what is included as short scenarios: what the user does and what the system does in response. Every bit as useful, list what you are not building. An explicit exclusion list prevents more argument at delivery time than the rest of the brief combined. Mark too which parts are firm and which are still open — estimators price uncertainty, and hiding it helps nobody.
List the constraints. This means existing systems the software development companies in europe has to talk to, the data you already hold and its condition, security and compliance rules, expected load, target platforms and any technology you are committed to. If a deadline is real, laravel development company say what depends on it: a good team will often resequence the work to meet it, but not if the date is a secret.
Write down what done means for the important items. Testable acceptance criteria do not require special syntax: a short list stating what must be true when the feature works is sufficient. This single habit reduces the sign-off process dramatically and closes off the usual argument at handover.
Finally, ask for a specific format. Request an itemised estimate, a written list of assumptions, the risks the team sees and an optimistic and a pessimistic 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 clarify that area and ask for a new estimate — the revised figure is far closer to reality.