Most tradies lose more money in unclear quotes than they ever do in actual bad customers. The quote that says supply and install hot water unit, $1,800, looks neat, but it leaves every grey area silent. The valve that needs replacing because the old one is seized. The extra hour because the cupboard the unit sits in needs a new shelf. The trip back to swap a fitting nobody flagged. Each of those is a hundred dollars you didn’t quote for and now have to either eat or argue about. The quote is where most jobs quietly start losing margin.
Here’s how to write a plumbing or electrical quote so the price you quoted is the price you actually get paid, and so the customer never has a fair reason to argue when the invoice arrives.
The line between a quote and an estimate, and why it matters
The first thing a clear quote does is announce what kind of document it is. A quote is a fixed price for a clearly defined scope. An estimate is your best informed guess at the cost of work that can’t yet be exactly defined. Both are valid. What gets people in trouble is sending an estimate but calling it a quote, then being held to a price that was always conditional. If the work involves discovery, like opening a wall or chasing an electrical fault, say so on the document and call it an estimate with an upper limit you’d come back to confirm. The wording protects you legally and saves the conversation later.
Describe the work in plain language the customer can repeat back
The single best test of a quote is whether the customer can re-read it three weeks later and still know exactly what they agreed to. Trade jargon is fine in moderation. Initialism soup is not. Replace S/I new HWU with supply and install one new electric hot water unit, 250 litre, Rinnai or equivalent, in the existing laundry cupboard. If a builder, a partner, a tenant or a property manager could read the same line and arrive at the same picture, you’ve written it well. If three different readers would picture three different jobs, you haven’t.
Name what is not included, in writing
Most disputes are about what was not in the quote, not about what was. Put a short exclusions list at the bottom of every quote. Does not include relocation of existing pipework, repair to wall finishes, replacement of damaged tapware found on disconnect, or upgrade of switchboard if existing capacity insufficient. Customers don’t read this list before the work starts. They read it when the bill arrives. By then it has done its job, because the conversation moves from “you should have included that” to “you said it wasn’t included, what would you like to do.” That’s a much shorter and calmer conversation.
Allowances and provisional items belong in their own section
If you don’t know exactly what’s behind the wall, don’t pretend you do. Use a clearly marked allowance, like a $300 allowance for replacing the isolation valve if it’s seized, with the actual cost confirmed once the wall is open. Set those items apart visually so the customer can see what’s a fixed price and what’s a placeholder. Quotes that mix allowances into the main scope without flagging them are how customers end up feeling stitched up later, even when the tradie did nothing wrong. Visibility is the difference between a fair allowance and a hidden surprise.
Set the time window for the price
Material prices move. Labour rates move. Supplier availability moves. Every quote should include a validity period, like 30 days from the date issued, and a brief note that prices may need to be re-confirmed if the work is booked outside that window. This protects you when a customer decides to go ahead three months later and expects the same number. Without the validity line, you are stuck arguing about an old number. With it, you can simply say the quote needed updating, and reissue cleanly.
Spell out the payment terms, not just the price
The price is only half the deal. The terms are the other half. Spell out the deposit if there is one, the schedule of progress payments if it’s a bigger job, the trigger points for each payment, and the payment due date for the final invoice. Something like 50 per cent on booking, balance within seven days of practical completion, late fee of 1.5 per cent per month after 30 days. Customers don’t argue with terms they signed up to. They argue with terms they didn’t see until the invoice arrived. Put them on the quote, not just on the invoice.
Write the quote you’d want a tradie to send your mum
The final test is simple. If your mum was hiring this work, would the document she received from a stranger feel professional, fair and clear? Or would it feel like a hurried text with a number on the end? Most quotes fail this test. The customer gets a one-line price and a vague verbal promise. Lift the quote to the standard of the work and most of the post-job arguments disappear before the work even starts. The customer signs because they trust the document. The tradie gets paid because the document carries the trust.
A clean quote isn’t just a sales document. It is the first piece of evidence that you run a tidy job. Write the work you’re actually doing, name what you aren’t doing, flag the unknowns honestly, and put the terms in plain English. The price you wrote down is the price you’ll get paid, because there’s nothing left to argue about.