Every client eventually asks it.
“So what’s the total?”

Variations get discussed as a construction-phase problem, but in practice they shape a job from before the slab. It helps to see the two places they cluster.

Before the build: the pre-construction squeeze

Clients reasonably expect paperwork, variations and final pricing locked before a job starts. But late pre-construction is exactly when scope is still moving, often because of the client’s own changes, and some pricing legitimately cannot be finalised until the construction certificate or equivalent approval is issued. That combination (client changes moving the goalposts, approvals gating final numbers) is a common source of delayed start dates and client anxiety, and most of the frustration comes from it never being explained. Walk the client through the sequence early: what can be priced now, what waits on approval, and how each change they request moves the date.

Then comes the moment that decides how the relationship goes: the client, handed a bundle of variations, asks “so what’s the total?”. In our experience this is where trust is won or lost late in pre-construction. A builder who can answer immediately, with a clear running total, reads as in control. A builder who has to go away and add it up reads as someone whose paperwork is behind their promises, right at the moment the client is deciding how much to relax.

The one rule: document, price, approve, then build

Almost every residential building contract requires variations to be in writing and signed by both parties before the work proceeds, and even where wording differs, treating that as non-negotiable protects everyone. The discipline is a sequence: describe the change, price it (including its time effect on the program), get the signature, then build it. Work done ahead of the signature inverts your position: the cost is spent and real, while the revenue has become a negotiation with someone who now holds the leverage.

Where variations flow after approval

• Into the contract sum and your claims. Approved variations adjust the contract price and appear in progress claims. A clearly documented, signed variation is also what stands up if a claim ends up in a security of payment process, where vague scope changes are exactly what respondents attack.
• Into the budget. A variation changes cost as well as revenue. If it never reaches the job budget, your cost tracking quietly diverges from the real job.
• Into your insurance obligations. Accumulated variations can move the contract value enough to matter for home warranty cover. In NSW, for example, a variation greater than 20 per cent of the original contract price (up or down) must be notified and adjusts the premium. Thresholds and rules differ by state, so check your scheme; see our state-by-state guide.

None of this is legal advice, and contracts differ on notice periods, pricing methods and what counts as a variation versus a prime cost or provisional sum adjustment. When a specific dispute is live, the contract wording and proper advice govern, not a website.

Variation discipline fails for administrative reasons, not moral ones. The change is discussed on site, the estimator is mid-takeoff on another job, the document gets drafted Thursday, and by then the carpenter has started. Everyone meant well; the sequence broke because each step lived in a different place: a text message, a spreadsheet, an email attachment.

Software fixes the sequence by holding it in one place. The request is logged against the job the day it arrives, pricing draws on the same rates as the estimate, the document goes to the client for a recorded approval, and the approved variation lands in the budget and the next claim without being retyped. The running total is a live number instead of a Friday reconstruction. That leaves the genuinely hard part (the pricing judgement and the client conversation) to you, with the paperwork keeping pace instead of trailing a week behind.