The customer keeps adding "one more thing": how to say yes and still get paid

What the rules say

For larger jobs, the regulators want extras in writing before the work starts:

• VictoriaYou and the customer agree in writing to variations using a Variation Notice before the work starts. It is not required for a change that will not need a permit change, cause delay or add more than 2% to the price, if you reasonably believe that.
• New South WalesVariations must be in writing, attached to the contract and signed by both sides. Urgent safety work can be written up after.
• QueenslandPresent the variation in writing and get the owner's written agreement. Give them a written copy before the variation work starts or within 5 business days, whichever is earlier. You cannot require payment for a variation before the variation work has started.

Things you can say

• "No worries, I will price that up and send it through before we start."
• "I can fit that in after this job. I will quote it separately."
• "Sure thing. It will be an extra amount, and I will text you the number to approve."
• "I am flat out this week, but happy to book it in."

Make it easy for yourself

• put common extras on the quote as optional lines
• keep a variation form on your phone
• photograph the area before and after
• do a short walk through each week so nothing is a surprise
• do not start the extra until you have the yes

Why this matters

Tradies in public forums say the same thing: if it is not in writing, it is hard to get paid for it. A quick message now saves an argument at the end.