Begin with the problem you are solving, not a list of screens. Who will use the system, how often, and how is the job done today? An experienced team who understands the goal can propose a cheaper route to it; someone handed only a feature list will price your assumptions along with the work.
Describe the scope as concrete flows: a walk through each important path. Equally important, write down what you are not building. A written out-of-scope list saves more disagreement later than any other single page. Also mark which decisions are settled and which are still under discussion — estimators price uncertainty, and hiding it only hurts you.
List the constraints. These include systems you must integrate with, the data you already hold and software development outsourcing saudi arabia its condition, regulatory obligations, user volumes, which devices matter and infrastructure that is already decided. If a deadline is real, say what depends on it: a good team will often cut the right scope to meet it, but not if the date is a secret.
Define what done means feature by feature. Testable acceptance criteria do not need special syntax: a plain-language note setting out what a user should be able to do will do. That one addition shortens the sign-off process by a surprising margin and removes the most common source of disputes.
Finally, ask for a specific format. Request a breakdown by feature or module, the assumptions behind each number, whatever the team considers risky and a low number and a high number. Take a broad range as information, not evasion: it normally identifies where your description is thin. Then clarify that area difference between vue and react ask for a new estimate — the second estimate tends to be the one worth planning around.