Start with the business problem, not a list of screens. Which people will use it day to day, how many times a day, and what happens today? A vendor who understands the goal can propose a simpler way to reach it; a team that receives only a list of screens prices exactly what you asked for.

Define what is included as concrete flows: what the user does and what the system does in response. Just as important, state explicitly what is out of scope. An explicit exclusion list prevents more friction during acceptance than almost anything else in the document. Also mark which items are decided and which are still under discussion — the difference changes the price, and concealing the open questions only hurts you.

Write down the hard constraints. The list covers the platforms and nodejs vs laravel services involved, existing databases and their quality, security and compliance rules, outsource laravel development user volumes, target platforms and stacks you cannot change. Where a date is genuinely fixed, say what depends on it: a good team will often rearrange the plan to meet it, but only if they know it exists.

Define what completion means feature by feature. Acceptance criteria need not use any formal notation: a short paragraph describing what must be true when the feature works will do. This one section reduces the review at the end considerably and removes the usual argument at handover.

Finally, ask for a specific format. Request a breakdown by feature or module, a written list of assumptions, whatever the team considers risky and an optimistic and a pessimistic figure. Treat a wide range as information, not evasion: it usually points to where your description is thin. From there clarify that area and ask for a new estimate — the revised figure is the one worth planning around.