Most disagreements over price are not about dishonesty on either side. They are about two people picturing a different job when they agreed to it.
Write down what's included — and what isn't
It is tempting to only list what you are doing. Explicitly listing what is excluded — for example, "does not include disposal of old unit" — prevents the most common source of "I assumed that was included" disputes.
Describe the finish, not just the task
"Paint the fence" is vague. "Two coats of [product], [colour], excluding the gate" is specific enough that both sides can check the finished work against it.
Note what happens if something unexpected is found
Especially in renovation and repair work, a line like "additional work required due to unforeseen issues will be quoted separately before proceeding" sets expectations before they are needed, not during an awkward mid-job conversation.
Put the scope in writing even for small jobs where a verbal agreement feels sufficient. The jobs most likely to end in a dispute are often the smaller, informal ones where nothing was written down.
Get it agreed before work starts, not after
A scope only prevents disputes if the customer has actually seen and agreed to it beforehand. Sending it after the job starts — or worse, after it finishes — defeats the purpose.
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