It is rare for a job to end with exactly the same scope it was quoted for at the start: the client sees the work progress and almost always asks for some change or addition along the way.
Document every change in writing
When the client asks for a modification (changing a material, adding a light point, moving a partition a few centimetres), it's wise to document it in writing immediately, even with a brief message, before carrying it out. Executing changes "by word of mouth" without leaving a record is the most common source of arguments about what was asked and what wasn't.
Additional quote, not a silent adjustment of the original
Each relevant change should generate a clear additional quote, added to the original, instead of simply raising the final invoice without explanation. This lets the client decide consciously whether to take on that extra cost or prefer to keep the initial plan.
Changes that don't affect the price
Not all changes have an economic impact: some minor adjustments can be absorbed at no extra cost as a gesture of good relations with the client, provided they don't compromise the project's profitability. Knowing when to charge and when not to is part of the long-term business relationship with each client.
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