When a fixed-price project runs over, the cost is ours
A fixed price is a promise, not an estimate. When a project runs over, the studio absorbs the difference, not the client.
A fixed price is a contract of trust. You agree a scope, a fee and a deadline, and you expect all three to hold. Software work is unpredictable, and sometimes a project runs longer than anyone planned. When that happens, the question is not whether the estimate was wrong. The question is who owes what to whom.
At Yunaristech, the rule is simple. If a project overruns because of our own misjudgement, that cost belongs to the studio, not to you. You should never see an invoice for the studio's learning curve. You should never receive a message asking for more money because a database migration took longer than expected, or because a design review ran long. That risk stays with the studio, because the studio set the price.
What the studio should absorb
Most overruns are not caused by clients. They come from misreading a brief, underestimating a technical dependency or simply working slower than quoted. None of that is your responsibility. You paid for an outcome, not for a supplier's internal planning to be perfect. If a task takes three times as long as expected, and the reason is an estimation error, that cost should not pass to you. The work still finishes, at the price you agreed, and the gap becomes a lesson for the next quote.
A fixed price only means something if the studio carries the risk when its own guess is wrong.
Where the line moves
The one exception is genuine scope change. If you ask for a feature that was never part of the brief, or you decide halfway through that a marketing site now needs an online shop, that is new work, not an overrun. You should always be told plainly when a request sits outside the original scope, and you should see a separate quote before any work starts. You should never be surprised by that conversation, and you should never be billed for it after the fact without agreement first.
What you owe a fixed-price studio, in return, is clarity at the start. A clear brief lowers the chance of any overrun at all. What a fixed-price studio owes you is honesty throughout, a number that stays fixed unless you change the brief and a willingness to absorb its own errors quietly rather than pass them to your invoice. That is the whole point of pricing work this way. You should be able to plan your budget around a fixed number, not around the risk that an estimate was too optimistic.
If a project of yours is running over budget elsewhere, ask the supplier directly who is paying for it. The answer tells you a great deal about how they price their work, and how they will treat you the next time something goes wrong.