You finished the job, sent the invoice, got paid — and somehow barely broke even. Sound familiar? Most tradespeople have been there. Whether you are a builder, plumber, electrician, or any other trade, the problem usually is not the work itself. It is the quote.
A poorly put together quote does not just lose you money on one job. It sets a pattern — underpricing becomes a habit, forgotten items become normal, and before you know it you are working harder than ever for less than you deserve. The good news is that every one of these mistakes is fixable. Here are the five most common quoting errors and exactly what to do about each one.
1 Pricing from Memory
This is the classic scenario. You visit the site on Monday morning, have a look around, chat with the homeowner, then drive home. By the time you sit down to write the quote that evening, you are relying entirely on memory.
Details slip. The extra radiator in the hallway. The awkward boxing-in around those pipes in the corner. The second coat of paint on the landing ceiling that you know the client will want once they see the first coat. Small things individually, but collectively they can amount to hundreds of pounds of unpriced work.
The bigger the job, the worse this problem gets. A bathroom refit might have forty or fifty line items when you price it properly. Try remembering all of them from a twenty-minute walkthrough and you will miss a handful every time.
Record the site visit — voice notes, video walkthroughs, or photos with annotations. Capture everything while you are standing in the room looking at it. Apps like VoxTrade let you narrate the job as you walk through, then automatically transcribe your notes and generate priced line items. Nothing gets lost because you said it out loud while you were looking right at it.
2 Underpricing Labour
“I will just round it down to win the job.” This is the most expensive habit in the trades. It feels like a smart move in the moment — you want the work, the client seems price-sensitive, and you tell yourself you will make it up on the next job. But the next job gets the same treatment, and the one after that.
When you set your day rate, are you really covering everything? Your hours on site are just the beginning. There is travel time to and from the job. Time spent answering the client’s texts and emails. The hours you spent measuring up and writing the quote in the first place. Callbacks to fix snags. Time spent ordering materials, loading the van, and doing your books.
A day rate that does not cover your true costs is not a business — it is an expensive hobby.
Calculate your real hourly cost. Add up everything: van costs, fuel, insurance, tools and tool replacement, tax, pension contributions, training, phone bill, software subscriptions, and the hours you spend on admin that never appear on an invoice. Divide by the number of billable hours you actually work per year — not fifty weeks of forty-hour weeks, but the realistic number. That is your break-even rate. Your charge-out rate needs to sit comfortably above it.
3 Forgetting Sundries and Small Items
Screws, fixings, silicone, dust sheets, cable clips, masking tape, plumber’s flux, PTFE tape, filler, sandpaper — they add up fast. Individually they cost a few pounds each. On a big job, sundries and consumables can quietly eat 5–10% of your margin without you ever noticing until the job is done and you look at what you actually spent.
It is not just the cost of the items themselves. It is the trips to the merchant to buy them, the time spent hunting through the van for something you thought you had, and the disruption to your workflow. Every trip to the trade counter is half an hour of lost productivity.
Add a sundries or consumables line to every quote. You can either list the common items you know you will need, or build a percentage markup into your materials cost — 5% is reasonable for most jobs, and up to 10% on refurbishments and renovation work where you will burn through more consumables. Either way, make it visible on the quote so the client sees it upfront and you are not absorbing it silently.
4 Not Accounting for Contingency
Old buildings hide surprises. You strip back the plasterboard and find rotten joists. You lift the floorboards and discover obsolete wiring that needs replacing before you can do anything else. You start chasing a wall and the plaster crumbles because the whole wall is blown.
If you quoted a fixed price with zero contingency, those surprises come straight out of your pocket. The client is not going to be happy about a price increase mid-job, especially if the quote did not mention the possibility. Now you are in a difficult conversation about money when you should be focused on the work.
Add 10–15% contingency on older properties, and be explicit about it. State in your quote what is included and, critically, what is excluded. “This quote assumes sound plaster throughout. Any areas of blown plaster discovered during the work will be re-quoted separately.” That one sentence protects you, manages expectations, and makes you look professional. On new-builds or straightforward work, you can drop the contingency to 5% or omit it entirely — but always state your exclusions in writing.
5 Taking Too Long to Send the Quote
You visit the site on Monday. You meant to write the quote Monday evening, but you were tired after a full day on the tools. Tuesday is busy. Wednesday you start it but get distracted. Thursday you finally send it — and the client has already accepted someone else’s quote.
Speed wins work. The first professional-looking quote to arrive has an enormous advantage. It is not just about being fast; it is about what speed signals to the client. A quick turnaround says: “This person is organised, reliable, and takes my job seriously.” A quote that takes a week says the opposite.
Research consistently shows that the first tradesperson to provide a written quote wins the job more often than not, even when they are not the cheapest option. Clients value responsiveness, and a prompt quote builds trust before the work has even started.
Quote on site whenever possible. With voice quoting tools like VoxTrade, you can record the job as you walk through, review the AI-generated line items, adjust prices, and send a professional PDF to the client before you have even left the driveway. Even if you prefer to refine things at home, aim to send the quote the same day as the site visit — the fresher the details are in your mind, the more accurate it will be.
Protect Your Margins, Win More Work
Every one of these mistakes comes down to the same root cause: quoting is treated as an afterthought instead of a core business process. The trades are skilled, physical work — but the business side matters just as much. A brilliantly executed job that you underquoted by 15% is still a loss-maker.
Be systematic about site surveys so nothing gets missed. Be honest about your labour cost so every job is genuinely profitable. Be fast about sending quotes so you win the work in the first place. And build contingency and sundries into every price so the surprises do not come out of your pocket.
Your margins will thank you. Your stress levels will thank you. And your bank account will definitely thank you.
Quote faster. Quote accurately.
VoxTrade turns voice notes and video walkthroughs into professional, priced quotes — before you leave site.
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