A fixed price can be good for the customer and good for the tradie. The customer knows what they are up for. The tradie has a clear price to manage against. The problem is when the price is fixed before the job is understood. Then the tradie carries all the unknowns and the customer thinks every unknown was already included.
Before giving a fixed price, ask the boring questions. The questions are not a delay tactic. They are how you find the risk before it eats your margin or turns into an argument on site.
What exactly are they asking you to fix or build?
Make the customer name the outcome, not just the trade. A request for electrical work could mean replacing a switch, finding a fault, adding a circuit, moving service equipment or upgrading a switchboard. A request for plumbing could mean a blocked drain, a cracked pipe, a fixture swap or a leak behind a wall. If the customer cannot describe the outcome, give them prompts. The fixed price should be attached to a defined result, not to a trade label.
What is visible and what is hidden?
Ask what can be seen. Then ask what cannot. Walls, ceilings, soil, roof cavities, old concrete, waterproofing, pipe runs and termite damage can hide the part that changes the job. If the price depends on hidden conditions, write that into the quote. A fixed price can still have assumptions. The customer needs to know which parts are fixed and which parts are waiting on inspection.
Who is supplying the materials?
Material supply sounds simple until a customer buys the wrong item or delays delivery. Ask whether the customer is supplying anything. If they are, ask for model numbers, measurements, delivery dates and who carries the risk if it does not fit. A customer-supplied tap, vanity, door, appliance or tile can make a job cheaper, but it can also turn one visit into three. Put the supply rule in the quote before the price is accepted.
What access do you actually have?
Access questions protect your day. Can you park close to the job? Is there room for a ladder, skip, trailer or materials? Is the property tenanted? Is the work behind a locked gate, inside a roof space, under a house or up a steep driveway? Are there body corporate rules, noise limits or lift bookings? A cheap fixed price written without access facts is usually just a guess with confidence.
What finish does the customer expect?
Ask what the customer expects to see when you leave. Safe and working is one finish. Paint-ready is another. Like-for-like replacement is not the same as an upgrade. A customer might expect patching, cleaning, caulking, disposal, touch-up paint or a final polish because that is what a finished job looks like to them. If those items are outside your trade or outside the price, say so before the job starts.
What has already been tried?
Previous work matters. Ask whether another tradie has looked at it, whether parts have been replaced, whether a tenant has attempted a repair, or whether the customer has used temporary fixes. A drain that has been cleared three times is different from a first blockage. A leaking roof after two patch repairs is different from a new leak. Previous attempts change the likely cause and the level of risk in your fixed price.
What would make the price change?
Name the triggers before the customer accepts. Hidden rot, non-compliant wiring, asbestos, rotten framing, blocked access, customer-supplied materials not fitting, extra trips, urgent work, after-hours access and changes in scope can all move the price. This is not about leaving yourself a blank cheque. It is about telling the customer which facts are outside the fixed number. A fair customer will usually respect the clarity.
Does the job need a site visit first?
Some jobs should not be fixed-priced from photos. If the risk is in the wall, under the slab, inside the switchboard or above the ceiling, say a site visit is needed. Customers sometimes push for a number because they want certainty quickly. Giving them a neat number that later collapses is worse than saying the job needs eyes on it first. A callout or paid inspection can save both sides a larger fight.
Put the agreement in one place
For what tradies should ask before giving a fixed price, the useful record is usually short: what was agreed, who agreed it, when it was agreed, and what it does to price or timing. Keep that in one message, quote, invoice note or job file entry. Scattered details across calls and texts are where honest people start remembering different things. One written record gives both sides a calmer place to return to if the job later gets tense.
Keep the proof with the job
Save the quote, photos, messages, payment record, invoice and any approval tied to the issue. The proof does not need to be dramatic. It just needs to be findable. A customer can use it to explain a concern clearly. A tradie can use it to show what was done and why. The person with the clean record usually has the easier conversation when something is questioned later.
A fixed price is not brave just because it is fixed. It is useful when the work, access, materials, finish and assumptions are clear. Ask the questions first. Put the answers in the quote. The customer gets a cleaner number, and you are not left paying for every unknown you were too polite to ask about.