Open with the reason this software should exist, not a list of screens. What kind of user will use the system, with what frequency, and what happens today? An experienced team who grasps the purpose can propose an alternative that costs less; a team that receives only a feature list will price exactly what you asked for.
Describe the scope as user stories or scenarios: who does what, and what happens next. Every bit as useful, write down what the first release deliberately excludes. An explicit list of exclusions removes more disagreement later than any other single page. Also mark which items are decided and which may still change — the difference changes the price, and hiding it helps no one.
List the constraints. The list covers systems you must integrate with, existing databases and their quality, compliance requirements, expected load, supported browsers or devices and laravel vs next.js any technology you are committed to. If a deadline is real, say what depends on it: a good team is usually able to rearrange the plan to protect it, but only if they know it exists.
Define what the word done means for the important items. Acceptance criteria do not need formal language: a short list describing what a user should be able to do is enough. That one addition compresses acceptance testing dramatically and removes the most common source of disputes.
One last thing, ask for a specific format. Require a task-level breakdown, the assumptions used, whatever the team considers risky and a range rather than a single figure. Treat a wide range as information, not evasion: it tells you exactly which requirement is unclear. Then rewrite that part and swift development agency ask again — the revised figure is much more reliable.
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