By the time a variation actually needs handling — a change of mind, an unexpected find behind a wall — it's too late to agree the process for the first time. That conversation needs to happen before work starts, while both sides can think about it calmly rather than under the pressure of a decision needed on site that afternoon.
A short set of questions at contract stage establishes exactly how change will be handled, so when it inevitably comes up, nobody is improvising.
Ask what process a variation actually goes through
Get a plain answer: who raises it, who prices it, how quickly a price is turned around, and what has to happen before work on the change proceeds. If the answer is vague — 'we'll just sort it out on site' — that's worth pressing on, since it's exactly this vagueness that leads to disputes later.
Ask for an example of how a recent variation on another job was handled from raising to sign-off, which tends to reveal whether the process is genuinely followed or just described.
Check whether small changes can proceed without your sign-off
Some contracts allow the contractor to proceed on very minor changes without formal written acceptance, above a certain value threshold. Ask what that threshold is, if any, so you know at what point you should expect to be consulted before work on a change goes ahead.
Where no threshold is stated, assume every change, however small, should be confirmed with you before it proceeds, and say so explicitly if that's what you want.
Ask how unforeseen issues, not client-requested changes, are handled
Variations aren't only about changing your mind — many arise from unforeseen conditions the builder discovers once work is under way, such as old wiring or unexpected structural condition behind a wall. Ask specifically how these are priced, since there's often less scope to shop around for a competitive price on urgent, unforeseen work.
It's reasonable to ask for photographic evidence of the unforeseen issue before agreeing the associated cost, which most professional contractors will provide as a matter of course.
Ask for a running total to be kept and shared
Confirm at the outset that you'll be able to see a running total of the contract price plus accepted variations at any point, rather than finding out the cumulative effect only at the final account. Ask how often this will be shared — weekly, at each stage payment, or on request.
A contractor who's comfortable sharing this running total throughout the job is generally a good sign; reluctance to produce it partway through is worth treating as a warning.
Check what happens if you disagree with a proposed variation price
Ask what the process is if you think a variation is priced unfairly — is there room to negotiate, get a second opinion, or decline the change entirely and keep the original scope? A contract silent on this leaves you with no clear route if you and the contractor genuinely disagree.
Knowing this in advance, even if you never need to use it, gives you confidence that the variation process has a genuine check built in rather than being entirely one-sided.
Common questions
Can I refuse a proposed variation?+
Generally yes, if it's a client-requested change rather than something required to keep the works safe or compliant. If you decline, the work proceeds against the original scope instead.
How do I avoid being pressured into agreeing a variation on the spot?+
Ask for the price in writing and take a reasonable amount of time to consider it, rather than agreeing verbally under pressure while a trade is standing on site waiting. A properly run process should accommodate this.
What if a variation reveals the total is running well over budget?+
Seeing a running total updated as variations occur, rather than only at the end, is exactly what allows you to make an informed decision about scaling back later changes if the budget is under pressure.
Ask us how we handle unexpected changes
We'll explain our variation process, including how unforeseen issues are priced, before you sign anything.