Free Estimate Software Australia: GST Estimates Fast for Tradies & Construction
For builders, electricians, plumbers and subbies who need a clear, GST-inclusive estimate in front of a client before the next mob gets there.
Last updated 31 May 2026
Estimate software built for Australian tradies and construction businesses, so you can price a job and get a professional estimate out before you have left the site. Add your business name, ABN and details, list labour, materials, plant hire and disposal as separate line items, and the tool works out the 10% GST and the all-up total for you. You see a live A4 preview and download a PDF you can text or email on the spot. No spreadsheet, no fiddling with a quote book in the ute. Construction runs on tight margins and moving material prices, so a clear estimate with a valid-until date protects you when timber, steel or fuel costs jump between pricing and start. Itemising the job also heads off the classic blue over what was and was not included. Whether you run domestic reno work, commercial fit-outs or sit a few rungs down the subbie chain, this gets a credible number in the client's hands fast, which is usually what wins the job.
How to use this tool
- 1
Enter your business and client details
Add your business name, ABN and email, then the bill-to name and client email. Set an estimate number, issue date and a valid-until date so expectations are clear from the start.
- 2
Add your line items
List each product, service or stage with a description, quantity and unit price. The tool calculates line totals, the GST component at 10% and the grand total as you type, so the preview always reflects the real figures.
- 3
Preview, then download or print
Check the live A4 preview, add any notes or terms, then download a professional PDF or print it. Send it to your client and keep a copy on file to follow up against.
What makes a solid estimate in Australia
An estimate is not a legally binding quote, and that distinction matters. A quote is a fixed offer: accept it and you are generally locked to that price. An estimate is your best, good-faith projection of cost, and it can move if the scope or conditions change. To protect yourself, label the document clearly as an estimate, not a quote or tax invoice, and state plainly that figures are approximate and subject to final measurement or scope. A credible estimate still carries the core details a client looks for: your business name and ABN, the client's name, the issue date, an itemised breakdown with quantities and unit prices, and a valid-until date so the pricing has a sensible expiry. Including your ABN signals you are a registered, legitimate operator, which matters for trust and for any client who later reconciles the estimate against an invoice. Add a short notes or terms block covering what is and is not included, payment expectations, and any assumptions you have made, such as access, site readiness or material availability. The clearer the boundaries, the fewer disputes later. A well-structured estimate also makes your eventual invoice faster to raise, because the line items already exist. Treat the estimate as the first document in a paper trail that runs through to payment, and keep numbering consistent so you can find it again.
Handling GST on your estimate
If your business is registered for GST, which is required once annual turnover reaches $75,000, your estimate should show prices the way your client will eventually be charged. The cleanest approach is to list each line at its GST-exclusive price, show the GST component as a separate 10% line, then display the GST-inclusive grand total. This tool does that automatically, so your client sees exactly what they will pay and there are no surprises when the invoice arrives. If you are not registered for GST, do not add a 10% component and do not use the words tax invoice on any follow-up document, because charging GST without being registered is not permitted. Be explicit on the estimate about whether prices include or exclude GST: a line that simply says $5,000 is ambiguous and invites a dispute. For larger projects, remember GST applies to the value of everything you supply, including materials you on-charge, so build the inclusive figure into the number your client signs off on. Getting GST right at the estimate stage means the figure your client approves is the figure you can invoice, which keeps cash flow predictable and your quarterly BAS reconciliation clean.
Getting your estimate acted on faster
An estimate only earns its keep when it turns into approved work. Speed is the biggest lever: the business that responds first tends to win a disproportionate share of jobs, so sending a tidy estimate the same day a client enquires beats a perfect one sent a week later. Make the document easy to say yes to. Lead with a clear total, keep line items readable, and put the valid-until date somewhere obvious so there is a gentle reason to act. Spell out the next step in your notes: reply to confirm, pay a deposit, or sign and return. Ambiguity is the enemy of action, so remove it. Personalise the estimate with the client's correct name and a one-line summary of what they asked for, which signals you listened. Follow up within two to three business days if you have not heard back, because most won jobs need at least one nudge and silence usually means busy, not no. Keep your estimate numbers sequential so you can track which are open, accepted or expired without a spreadsheet. Finally, make the figure defensible: a client who understands what each line covers approves faster and haggles less than one staring at a single lump sum with no breakdown.
When manual estimates start to cost you
Filling in an estimate by hand works fine for a handful a week. The problem starts when volume grows. Re-typing client details into every document, chasing approvals by memory, copying accepted estimates across into your invoicing system, and trying to recall which estimates have gone cold all quietly eat hours that should go into the actual work. Each manual re-entry is also a chance to fumble a price, an ABN or a GST figure, and one wrong number can cost you a job or a margin. This is exactly the kind of repetitive, rules-based admin automation handles well. A connected workflow can pull a new enquiry straight into a templated estimate, send it for e-signature, trigger an automatic follow-up if the client goes quiet, and convert an accepted estimate into an invoice without anyone re-keying a thing. That is the difference between a tool that produces one document and a system that runs your quote-to-cash pipeline end to end. If you are sending more than a few estimates a week and feeling the admin drag, that is the signal it is worth automating. Clever Ops builds those pipelines for Australian businesses, connecting the tools you already use so estimates, approvals and invoicing flow on their own and you stop doing the parts a computer should be doing.
Estimating construction work in Australia without getting burnt
Construction estimates live and die on scope and timing. Material prices move week to week, so always set a short valid-until date, seven to fourteen days is sensible when timber, steel, concrete or fuel are involved, and state in your notes that material costs are subject to supplier confirmation at the time of order. Break the job into labour, materials, plant hire and waste removal as separate line items rather than one lump sum, because a client who can see where the money goes argues less and approves faster. Be explicit about exclusions: who handles site access, rubbish removal, scaffolding, permits and provisional sums for anything that cannot be measured until walls are open. List variations as their own line so a change of mind is repriced cleanly, not absorbed into your margin. Show GST inclusively, because that is the figure the client signs off on, and if you are registered, which you must be once turnover hits $75,000, the 10% must appear. Remember an estimate is not a fixed quote, so make that clear in writing to keep room for final measurement. If you take a deposit, state the amount and that it is payable before the job is booked in. For larger commercial work, keep an eye on the Security of Payment rules in your state, which govern progress claims once work is underway. Finally, if you employ apprentices or labourers, your real labour cost includes super at 11.5% plus on-costs, so price labour to cover them, not just the hourly rate, or the margin disappears the moment payroll runs.
Who uses this tool
Builders and renovators
A builder pricing a bathroom reno itemises demolition, waterproofing, tiling, fit-off and waste removal, sets a 14-day valid-until date against rising tile prices, and texts the PDF before leaving the driveway.
Electricians and plumbers
A sparky estimating a switchboard upgrade lists labour hours, the board, breakers and certification separately, shows GST so the homeowner sees the real cost, and beats two slower quotes to the job.
Subcontractors
A concreting subbie quoting a builder breaks out formwork, supply, pump hire and finishing, notes that material rates are subject to supplier confirmation, and keeps sequential estimate numbers to track open jobs across multiple sites.
Frequently asked questions
Is an estimate the same as a quote?
No. A quote is a fixed offer that generally binds you to the stated price once the client accepts. An estimate is your best good-faith projection and can change if the scope, measurements or site conditions change. Label the document clearly as an estimate, and state that figures are approximate and subject to final scope, so both sides understand the price may be refined before work begins.
Do I need to include GST on my estimate?
If your business is registered for GST, which is required once turnover reaches $75,000, you should show the 10% GST so the client sees the price they will actually pay. This tool calculates it automatically and displays the GST-inclusive total. If you are not registered, do not add GST and do not describe the document as a tax invoice. Either way, state clearly whether your prices include or exclude GST.
Should I put my ABN on an estimate?
Yes. An ABN is not strictly required on an estimate, but including it signals you are a registered, legitimate operator and builds trust. It also makes life easier later, because the client can reconcile your estimate against the eventual tax invoice, which does require an ABN. The tool has a dedicated ABN field, so add it once and it appears on every estimate you generate.
How long should an estimate stay valid?
Set a valid-until date that reflects how stable your costs are. Thirty days is common for service work. If your pricing depends on material costs that move, such as timber, steel or fuel, a shorter window of seven to fourteen days protects your margin. A clear expiry also creates a gentle reason for the client to act rather than letting the estimate drift. The tool includes a valid-until field for exactly this.
Is my data stored anywhere?
No. The estimate is built in your browser and the PDF is generated locally, so your business and client details are not uploaded or stored on a server. You stay in control of the document. If you choose the email-me option, that is used only to send you the PDF copy you asked for. Keep your own record of each estimate so you can follow up and later convert it to an invoice.
Can I turn an accepted estimate into an invoice?
Yes, and it is straightforward because the line items already exist. Once the client approves, the same descriptions, quantities and prices carry across into a tax invoice; you relabel the document and add an invoice number and payment terms. If you send many estimates, automating that handover saves real time and removes re-keying errors. Clever Ops builds those quote-to-cash workflows for Australian businesses so accepted estimates flow into invoicing on their own.