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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 happens today? A vendor who understands the goal can propose a simpler way to reach it; one who only sees a list of screens can only price exactly what you asked for.

Define what is included as user stories or scenarios: what the user does and what the system does in response. Every bit as useful, custom php development write down what the first release deliberately excludes. A written out-of-scope list removes more friction during acceptance than the rest of the brief combined. Indicate as well which parts are firm and which are still under discussion — honest teams price those differently, and concealing the open questions helps nobody.

Write down the hard constraints. These include the platforms and services involved, the data you already hold and its condition, security and compliance rules, user volumes, target platforms and stacks you cannot change. Where a date is genuinely fixed, say why: a good team is usually able to cut the right scope to protect it consulting services, but not if the date is a secret.

Define what done means for the important items. Testable acceptance criteria need not use any formal notation: a short list describing the expected behaviour is enough. This single habit reduces the review at the end considerably and removes the most common source of disputes.

Finally, say what you expect back. Ask for a breakdown by feature or module, the assumptions used, whatever the team considers risky and a low number and a high number. Treat a wide range as information, not evasion: vue js vs angular it tells you exactly which requirement is unclear. Then tighten that section and ask for a new estimate — the next version tends to be much more reliable.