Start with the reason this software should exist, not a list of screens. What kind of user will use this, how often, and what does the process look like without it? An estimator blockchain development company who grasps the purpose can propose an alternative that costs less; someone handed only a list of screens prices exactly what you asked for.
Define what is included as user stories or alpine js vs livewire scenarios: a walk through each important path. Just as important, state explicitly what is out of scope. An explicit exclusion list saves more friction during acceptance than any other single page. Mark too which items are decided and which may still change — estimators price uncertainty, and pretending everything is fixed only hurts you.
List the constraints. These include systems you must integrate with, existing databases and their quality, compliance requirements, expected load, supported browsers or devices and stacks you cannot change. If there is a hard date, explain what drives it: a team will often rearrange the plan to hit it, provided they hear about it early.
Define what the word done means feature by feature. Acceptance criteria do not need special syntax: a plain-language note describing the expected behaviour is sufficient. This single habit shortens the review at the end considerably and removes most late-stage disagreement.
Finally, outsourcing and development insights ask for a specific format. Request a task-level breakdown, the assumptions behind each number, whatever the team considers risky and an optimistic and a pessimistic figure. Treat a wide range as useful information rather than evasion: it normally identifies where your description is thin. Then tighten that section and ask for a new estimate — the second estimate will be much more reliable.