Nobody sets out to work for free. It happens one small favour at a time, and the bill at the end is where it all goes wrong.
2 September 2026 · 5 min read
You quoted a bathroom. By Thursday you have also moved a radiator, boxed in a pipe and hung a mirror. None of it was in the quote, none of it was refused, and none of it was written down. That is job creep, and it is one of the most reliable ways for a decent job to end up barely breaking even — or worse, ending in a row over the final invoice.
Because saying yes is easier than having a conversation while you are halfway up a ladder, and because each individual extra genuinely is small. The problem is never the first one. It is the eleventh, by which point you have no record of what was agreed and the customer honestly believes it was all part of the price.
“Happy to do that — it’s extra to the quote, I’ll text you the price tonight.” Said cheerfully, at the moment of asking, it is completely unremarkable. Said at the end, alongside an invoice £600 bigger than expected, it is a dispute. The timing does all the work.
A WhatsApp message is a written record. “Extra: move rad to opposite wall, £180 + VAT — OK?” and a thumbs up from them is worth more than any amount of remembering. Keep the extras in the same thread as the original job so the whole story sits in one place.
Small jobs bolted onto a bigger one are not cheaper to do — often they are dearer, because they interrupt your run of work and need a separate trip to the merchant. Price them at what they cost you. If you want to be generous, be generous openly and visibly (“no charge for the mirror”) rather than by quietly absorbing everything.
If you track the job as you go — starting it, adding materials as you buy them, then ending it — the invoice comes out of what actually happened rather than what you can recall on Sunday night. That is the whole point of running a live job rather than a memory; the job tracker guide walks through it, and quotes for the bigger variations that deserve their own paperwork.
There is a point where a variation stops being an extra and becomes a different job. If the scope has moved substantially, issue a fresh quote rather than stacking additions. It resets everyone’s expectations, and it protects you if the relationship later sours — see when a customer won’t pay.
Say it at the moment they ask, not at the end. A cheerful “happy to do that, it is extra to the quote, I will text you the price” is routine when it is immediate and awkward when it is retrospective.
A written exchange where you state the extra work and the price and the customer agrees is a far better record than a verbal chat on site. Keep it in the same thread as the job so the sequence is clear.
When the scope has changed enough that the original quote no longer describes the job. Re-quoting resets expectations for both sides and is much cleaner than a long list of additions bolted onto the end of an invoice.
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