It often starts with five harmless words: “While you are here, could you…?” The request may sound small, but the extra materials, labour and disruption can quickly turn a profitable job into a favour you never agreed to provide.
Construction variations are normal. The problem is not that clients change their minds. The problem is starting extra work without clearly recording what changed and what it will cost.
1. Treat every change as a new decision
A variation is any change to the agreed scope, specification, quantity, sequence or timing of the work. It might be an extra socket, a different tile, additional structural work or a delay caused by something the client was meant to arrange.
Do not rely on memory or a casual conversation on site. Pause and turn the request into a clear decision that both sides can review.
2. Record the request in plain English
Write a short description of the original plan and the requested change. Add photos, drawings or measurements where they help. Avoid vague wording such as “additional works” because it will be useless when nobody remembers the detail three weeks later.
A useful record answers four questions: what is changing, why it is changing, who requested it and when it was agreed.
3. Price the real impact, not just the extra material
The cost of a change is rarely limited to one more fitting or a few extra blocks. Consider additional labour, collection time, delivery fees, subcontractor call-outs, waste, rework and the effect on the rest of the programme.
If the variation interrupts work already completed, include the cost of undoing and remaking it. Being fair does not mean absorbing costs that were created by a new instruction.
4. Explain any change to the completion date
Extra work can move the programme even when the task itself looks small. A replacement product may have a longer lead time, or the change may mean bringing a subcontractor back to site.
State the expected time impact alongside the price. This prevents the client approving the change but still expecting the original completion date.
5. Get written approval before starting
Send the variation by email, message or through your job management system and ask the client to approve it in writing. For urgent safety work, record why immediate action was needed and confirm the cost as quickly as possible.
The approval does not need to be full of legal language. It needs to be specific, dated and easy to find.
6. Add the variation to the live job and invoice
Once approved, update the job value, materials, schedule and invoice plan. Do not leave variations on scraps of paper until the final bill. That is how earned revenue disappears.
Tradeways keeps client notes, proposals, job information and invoices together, making it easier to capture a change while it is fresh and carry the approved value through to payment.