A Tradie's Guide to Tracking and Charging for Project Variations
14 September 2026 · 6 min read · By Heaney Accounting
Project variations are the silent profit killer in the construction industry. When a client asks for extra work or site conditions change, failing to document these costs immediately often leads to them coming out of your own pocket.
Setting Clear Expectations from Day One
The foundation of managing variations starts before the first hammer swings. Your initial contract or quote must clearly state how additional work will be handled, communicated, and priced.
- A clear definition of what is included in the base quote
- A clause stating that all variations must be signed off in writing
- A pre-agreed hourly rate for additional labour
- A requirement for a percentage-based markup on materials
The Process for Approving Variations
- Stop work immediately once the variation is identified
- Calculate the extra cost for materials and labour
- Issue a formal 'Variation Order' form for the client to sign
- Wait for the signed approval before proceeding with the extra work
- Update your job management software to track the new costs
Pro Tip: If it isn't in writing, it didn't happen. A text message or a verbal 'yep, that's fine' is rarely enough to protect you if the client disputes the final invoice later.
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