The dominant factor is rarely the technology stack — it remains how much is still undecided. Every ambiguity in the specification turns into padding inside the number you receive. A supplier that has no visibility into what is livewire in laravel happens on the unhappy path will assume the more expensive option. Putting two weeks into a discovery phase can cut the overall figure by far more than negotiating the rate.
Integrations are the next major multiplier. A form that saves data is low risk; the same screen connected to a legacy ERP is another matter entirely. The effort lives in the third party: undocumented APIs, waiting on someone else’s team, inconsistent data. Ask the estimator to list every external system, since this is the usual source of overruns.
The requirements nobody writes down quietly rewrite the number. An application used by a handful of staff is a very different build from the same functionality serving a hundred thousand laravel vs .net comparison users. Security reviews, uptime targets, scalability, traceability and localisation each add measurable effort. State them early or ai automation company expect them priced as extras.
The mix of people behind the number matters. An hourly rate tells you almost nothing on its own: laravel vs django comparison a senior engineer at a premium rate frequently turns out to be cheaper per delivered feature than two inexperienced developers who require constant review. Check too who else is billed: coordination, quality assurance, release engineering and design have to be done by someone, but they should be visible in the estimate.
The number in the proposal is not what you will actually spend. Plan for hosting, paid APIs, monitoring and a maintenance allowance each year. A useful planning figure says that software in active use requires a recurring percentage of its original build cost annually for updates, security patches and small improvements. Ignoring this is the most common budgeting mistake.