Builder day rate Australia: day rate or fixed price?

TL;DR: Charge a day rate when you can't see the full scope until you open something up. Charge a fixed price when you can measure everything before you start. A day rate leaves the risk of the unknown with the client. A fixed price moves it to you, so it has to carry a contingency and a margin that a day rate doesn't. There is no official builder day rate in Australia, so work yours out from your own costs and billable days instead of copying a figure off a forum. Quote it plus GST if you're registered. To move a nervous client from an open-ended day rate to a fixed quote, sell them a paid investigation day first.

Small jobs are where margin goes missing quietly. A two-day deck repair becomes five once you find the bearers are rotten. Whether you or the client pays for that depends on a choice you made before you picked up a tool: day rate or fixed price. This guide gives the builder day rate Australia question a proper answer. It covers what a day rate needs to cover, when each model fits, who carries the risk under each one, and how to move a client from one model to the other without losing the job.

What counts as a small job here

In this guide a small job is work measured in days or a few weeks, not months. That means repairs, maintenance lists, a deck, a set of stairs, a bathroom wall that needs re-sheeting, a window swap or a fence. Usually one or two trades and one client making the decisions.

The rules still apply at this size. Every state requires a written contract for residential building work above a dollar threshold, and licensing kicks in above a threshold too. Those thresholds differ from state to state and they change, so check your state regulator before you price anything near the line. A day rate does not get a job out of those rules.

Day rate vs fixed price: who carries the risk

Every small job carries two risks: how long it will take and what it will cost. The pricing model decides who carries them.

Under a day rate, the client carries the quantity risk. If the job takes six days, they pay for six days. You carry a different risk: the client watches the clock and judges every day you bill. Day-rate disputes are rarely about the rate. They're about whether you were slow.

Under a fixed price, you carry the quantity risk. Rain, a supplier running late, a wall that isn't square, a material price rise between quote and order: all of it comes out of your margin. In exchange you keep the upside. If you finish a $6,000 job in three days instead of four, the extra day is yours.

	Day rate	Fixed price
Who pays if it runs long	Client	You
Who keeps the gain if it runs short	Client	You
Main dispute risk	"You were slow"	"That should have been included"
What protects you	A daily record of work done	Written scope, exclusions and a variation clause

One legal point. A day rate plus materials at cost with a margin is a cost-plus arrangement. Some states restrict cost-plus contracts on larger domestic building work (Victoria's Domestic Building Contracts Act 1995 is the best-known example). That rarely bites on a two-day repair, but it can on a bigger renovation priced "by the day". Check your state's rules before running a large residential job that way.

When a day rate is the right call

Charge a day rate when you honestly can't price the job without guessing. The common cases:

Hidden conditions. Subfloor work in an older house, opening a wet wall, chasing a leak, lifting a floor. Say you quote a fixed price to replace one bearer in a 1950s weatherboard house and find three more. Replacement members have to meet the AS 1684 span tables for the loads they carry, or be designed by an engineer, and you won't know which until you're under the house.
Client-directed work. "While you're here, can you also…" lists, where the client keeps adding and removing items.
Maintenance and make-good work. Rental turnovers, small defect lists or strata repairs, where each item is too small to quote on its own.
Urgent work. Storm damage or a make-safe, where getting started now matters more to the client than a firm number.
Working around other people. When the client's own trades or a supplier controls your timing, you can't promise a duration you don't control.

Common thread: a fixed price in these cases would mean either padding the quote until it's uncompetitive or gambling your margin on what's behind the plaster.

When a fixed price is the right call

Fix the price when you can measure the job and you've done it enough times to trust your labour estimate.

New work from a clear scope. A deck from drawings, a set of stairs, a fence line, a small slab. You can do the take-off, and the materials are countable. For a small pour, the concrete calculator gives you the bag count before you price it.
Like-for-like replacement where the spec is known. Swapping glazing in a door or beside a bath counts if you price the glass the standard requires. A pane in a door has to be Grade A safety glass, and missing that is a common way a fixed price goes wrong. The AS 1288 glazing requirements guide covers where else that applies.
When the client is comparing quotes. Homeowners comparing three builders compare totals. A day rate next to two fixed prices looks like a blank cheque, even when it would work out cheaper.
When you're fast at it. If you've built forty decks, the fixed price pays you for that skill. A day rate passes your speed on to the client as a saving.

Builder day rate Australia: working out your number

There is no official builder day rate in Australia. The Building and Construction General On-site Award 2020 on the Fair Work Commission's award library sets minimum wages for employees. It doesn't set what a business charges a client, and the two are a long way apart. Figures traded in forums and Facebook groups vary by trade, state, licence class and metro versus regional work. We haven't seen a reliable published survey of builder day rates, so we won't quote one. The only number that matters is the one that covers your costs.

Build it from the bottom up.

1. Count your real billable days. Start with 260 weekdays. Take off four weeks of annual leave (20 days) and public holidays (about 10, depending on your state). Then take off rain and sick days, plus the days you spend quoting, buying materials and doing admin. Most builders who count honestly are surprised by how low the total comes out.

2. Add up a year of overheads. Vehicle, fuel, tools and their replacement, public liability insurance, income protection, licence fees, phone, software, accountant.

3. Decide what you pay yourself. Set this as a wage, kept separate from profit.

4. Add a profit margin. Profit is what the business earns on top of your wage. It's not the same thing.

Here is a worked example. These are example numbers to show the method, not market rates:

Billable days: 260 − 20 leave − 10 public holidays − 15 weather and sick − 25 quoting and admin = 190 days
Overheads: $40,000
Your wage: $100,000
Cost per billable day: $140,000 ÷ 190 = $737
Plus 15% profit: about $847, rounded to $850 a day ex GST
With GST at 10%: $935 a day

If you bring an apprentice or labourer, give them their own day rate, built up the same way. Include their award wage, the 12% superannuation guarantee, workers compensation and their unbillable time. Our guide to construction award pay rates covers how to load labour when the rates move.

Then write down what a "day" means: hours on site, start time, whether travel is included, and whether there's a minimum charge (half a day is common). Materials are charged on top, at cost plus a stated margin.

Building a fixed price that holds up

Your day rate sits inside every fixed price you quote. A fixed price is just the day rate with the risk priced in:

Materials from a measured take-off, not an eyeball estimate
Labour as estimated days × your day rate
Contingency for what usually goes wrong on this type of job, set from your own job history
Margin on top of everything
GST shown clearly

Then protect it in writing:

Scope and exclusions. List what's included and, just as important, what isn't: rubbish removal, painting, electrical, making good.
Assumptions. "Price assumes existing joists are sound." If the assumption turns out wrong, you have grounds for a variation.
Provisional sums and prime cost items for anything not yet selected or not yet visible
A validity period. Material prices move, and a quote with no expiry is a promise to absorb the increase. The guide on rising construction costs covers how to word this.
A variation clause that says variations are agreed in writing before the work is done

Hybrid models between the two

You don't have to choose one model for the whole job.

Fixed price with provisional sums. Fix what you can measure and carry an allowance for what you can't, reconciled at the end.
Fixed stage, day rate for the unknown. For example: demolition and investigation by the day, then a fixed price for the rebuild once you can see it.
Schedule of rates. A price per item (per door hung, per lineal metre of skirting) suits maintenance lists. The client gets certainty per item and you get paid for the volume.
Day rate with a cap. Be careful here. A "not to exceed" figure gives the client the certainty of a fixed price without paying you its margin. If you offer a cap, set it high enough to carry the risk you're taking.

How to move a client from day rate to fixed price

Most clients want a fixed price, and most small jobs that start with an unknown can get there. The tool is a paid investigation day.

Name the unknown. "I can't give you a fixed price on the subfloor until I've seen it. Anyone who does is guessing, and you'll pay for the guess one way or another."
Sell the first day. "Give me one day at my day rate. I'll open it up, photograph everything and give you a fixed price for the rest."
Deliver what you promised. Send photos, a short written finding and a fixed quote for the remaining work.
Optionally, credit it. Some builders take the investigation day off the fixed price if the client goes ahead. It's a goodwill gesture, not a rule.

This works because the client is buying a small, bounded cost to remove a large, open one. It also shows them you're careful before they commit to the bigger spend.

How to move a client from fixed price to day rate mid-job

The other direction happens when you're on a fixed price and you open something up that wasn't in your assumptions.

Stop before you fix it. Work done before it's agreed is work you may not get paid for.
Photograph it and point to the assumption in your quote it breaks.
Issue a written variation that prices the extra work as a fixed amount where you can, or at your day rate with an estimate of days where you can't.
Get it signed or agreed in writing before you carry on. A text reply is better than a handshake. A signed variation is better than both.
Keep a daily log of hours and work done for any day-rate portion. It's your answer to "you were slow".

Common mistakes

Quoting a day rate without defining hours, start time, travel or minimum charge
Charging a day rate without registering for GST once turnover reaches the $75,000 threshold (see the ATO's GST registration rules)
Passing materials through at cost, with no margin for the time spent sourcing and collecting them
Fixing a price on a scope you haven't seen
Doing variation work first and pricing it afterwards

Frequently asked questions

What is a typical builder day rate in Australia?
There's no official or reliably surveyed figure. Rates vary by trade, licence, state and region. Work out your own from your overheads, the wage you need and your real billable days, then add profit. The worked example above shows the method.

Should I quote GST on top of my day rate?
If you're registered for GST, charge it. Make it clear whether a figure includes it. Homeowners compare total prices, so give them the GST-inclusive total, not just a figure "plus GST".

Is it legal to charge a day rate on residential work?
For small jobs, generally yes. Every state still requires a written contract and a licence above its own thresholds, though. Some states also restrict cost-plus contracts on larger domestic building work. Check your state regulator if the job is anywhere near those limits.

Can I charge a minimum call-out or half-day minimum?
Yes, if you state it in writing before you start. A short job still costs you travel, set-up and a slot in your week.

How do I stop a day-rate client thinking I'm dragging it out?
Send a short daily note with photos covering what was done, what's next and anything you've found. Clients who can see progress rarely argue about the hours.

Keep the numbers in your pocket

Both models depend on the same thing: knowing your quantities before you price them. The free Built Simple app has all 45 of our calculators on your phone, including concrete, stairs and balustrade spacing, with no signup required. It's an easy way to check a take-off on site before you commit to a fixed price. Download it and use it on the next small job you quote.