Should I accept a 'time and materials' quote?

Only with a written cap. Open-ended T&M is the most common cause of billing disputes.

Are minimum call-out charges fair?

Yes — a tradie's drive, parking and admin still costs them. Typical: 1–2 hours minimum.

Can I switch from hourly to fixed mid-job?

Often, yes — once the scope is clear, ask for a fixed price for the remainder.

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Decision guides

Fixed Price vs Hourly Rate Quotes

Updated 11 June 2026 · 5 min read · Written for Australian homeowners and builders

Fixed price feels safer; hourly rate often is fairer. Knowing when each one favours you is the difference between a smooth job and a billing dispute.

	Fixed price	Hourly rate
Best for	Defined scope (e.g. bathroom reno, switchboard upgrade)	Diagnostic, fault-finding, unknowns
You bear risk of	Scope creep variations	Slow workmanship
Tradie bears risk of	Surprises in walls/floors	You disputing hours
Typical premium	10–25% safety margin built in	None — but no ceiling either
Documentation needed	Detailed scope + exclusions	Hourly rate, call-out, min charge, written cap

When to insist on fixed price

Any job over ~$5,000 with defined scope.
Renovations with multiple trades.
Jobs where you can't be on site to verify hours.

When hourly is fairer

Diagnostic work (leak tracing, intermittent faults).
Small jobs under ~$1,000 where fixed-price margin would dominate.
Maintenance retainers across multiple properties.

Hybrid: fixed price + variation rate

The best of both worlds for renovations: fixed price for the defined scope, plus an agreed hourly rate for any genuine variations, with a written cap and your written approval required before work proceeds.

Frequently asked questions

Should I accept a 'time and materials' quote?: Only with a written cap. Open-ended T&M is the most common cause of billing disputes.
Are minimum call-out charges fair?: Yes — a tradie's drive, parking and admin still costs them. Typical: 1–2 hours minimum.
Can I switch from hourly to fixed mid-job?: Often, yes — once the scope is clear, ask for a fixed price for the remainder.

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