Open with the reason this custom software development rates should exist, not a list of screens. Which people will use this, with what frequency, and what does the process look like without it? An experienced team who grasps the purpose often proposes an alternative that costs less; one who only sees a list of screens will price exactly what you asked for.

Set out the scope as short scenarios: who does what, and what happens next js vs laravel performance. Every bit as useful, write down what the first release deliberately excludes. An explicit exclusion list removes more friction later than any other single page. Mark too which items are decided and which may still change — honest teams price those differently, and pretending everything is fixed only hurts you.

List the constraints. These include the platforms and services involved, the data you have and where it lives, compliance requirements, traffic expectations, target platforms and stacks you cannot change. If a deadline is real, say what depends on it: a dedicated team or project-based outsourcing is usually able to cut the right scope to meet it, but not if the date is a secret.

Say what the word done means for each item. Testable acceptance criteria do not require any formal notation: a short list describing the expected behaviour is enough. That one addition shortens the review at the end considerably and closes off the usual argument at handover.

Finally, ask for a specific format. Require a task-level breakdown, the assumptions behind each number, the main risks and a low number and a high number. Read a wide range as a signal about the brief: it tells you where your description is thin. At that point tighten that section difference between nearshore and offshore development ask for a new estimate — the revised figure will be much more reliable.