Change Orders: Getting Paid for “While You're Here…”

“While you're here, could you just…” is the most expensive sentence in construction. It arrives mid-job, sounds small, and comes from a client you like. So you say yes, do the extra hour, move the socket, add the spur — and by the end of the project you've given away days of work that were never priced, never agreed, and are now impossible to bill without a fight. Variations aren't the enemy. Unpriced variations are.

Every variation is a mini-quote

The reframe that fixes it: a variation is not a favour, it's a mini-quote. Every change gets the same treatment as the original job — describe it, price it, get a written yes, then do it. In that order, with no exceptions. Especially not for nice clients; nice clients are precisely the ones where 'we'll sort it out later' feels safe and costs you the most.

The three-line confirmation

The system is three lines, and a text message is enough: what changes, what it costs, what it does to the schedule. Verbatim example: 'To confirm today's chat — moving the radiator to the far wall means new pipe runs under the floor. Extra cost £280 + VAT, adds one day. Reply yes and I'll crack on.' Fifteen seconds to send. Legally, a text or WhatsApp reply is written confirmation — you don't need a form with a duplicate pad.

Why it has to be in writing

Why written matters isn't distrust — it's memory. In almost every variation dispute, the client genuinely remembers agreeing to the work. What nobody ever remembers agreeing to is the price. A one-line message with a number in it is a shared memory that both of you can scroll back to, and it turns 'you never said it was extra' into a conversation that lasts ten seconds.

Bill variations as they happen

Then bill variations as they happen — or at minimum, list each one separately on the next stage invoice with a reference to its confirmation. What you must never do is bundle them silently into the final invoice. A final bill that's £1,800 higher than the quote, with no itemisation, is the single most reliable trigger for an end-of-job dispute — even when every pound of it was agreed at the time.

Take photos before and after each variation. Thirty seconds with your phone camera creates the evidence that ends arguments before they start: here's the wall before we opened it, here's the rotten joist nobody could have quoted for, here's the finished fix. Photos attached to the variation message and the invoice make the paper trail complete.

When a client won't confirm

What if the client won't confirm in writing? That is the answer, and it's worth hearing early. Someone who says 'just do it, we'll square up at the end' but goes quiet when you send a two-line price to approve was never going to pay for it cheerfully. Your move: 'No problem — I'll hold off on that bit until you've had a chance to okay the cost.' The work waits. Your margin doesn't bleed.

Track the running total

Last discipline: track the running total. Individually, variations feel small; cumulatively they move budgets. When agreed extras push the project total more than about 10% past the original quote, say so explicitly — 'with the changes so far we're at £26,400 against the original £24,000, just so there are no surprises.' Clients budget against the quote. Surprises at the end don't just cause arguments; they cause non-payment.