A plumber day rate looks like a simple number, and it is the most expensive number to get wrong in your first two years working for yourself. £200 a day feels like a pay rise when you have spent a decade on somebody else’s payroll. Then the van insurance renews, the tip charges you for a ripped out bath, you lose a Tuesday to a job where nobody was in, and by March the bank balance is telling a very different story to the one in your head.
Most rates get set sideways. You hear what the lad who left the firm before you is charging, you knock £20 off it so you feel safe, and that number follows you around for five years while your costs quietly climb.
There is a better way to arrive at it, and it takes about an hour with a pen.
What A Plumber Day Rate Has To Cover
Your plumber day rate is not your wage. It is the only money coming into the business, so it has to pay for everything before a penny of it is yours.
- The van: finance or lease, diesel, insurance, tax, servicing, tyres, the MOT and the week it spends off the road
- Insurance that is not the van: public liability, tools in transit, and cover for the work itself
- Tools that break, walk off or wear out, plus the consumables nobody itemises: flux, fittings, blades, silicone, bags of rags
- Your registrations and tickets, including your Gas Safe renewal, water regs and any unvented or legionella refreshers
- Phone, quoting app, invoicing software, the accountant who sorts your self assessment
- Tip fees, workwear, boots, parking, the odd congestion charge
- Holiday, bank holidays, sick days and the fortnight your knee gives out
- A pension, because nobody else is paying into one for you
Add tax and National Insurance on top of all that. The number you charge has to swallow the lot and still leave you better off than the wage you walked away from, otherwise you have bought yourself a job with worse hours and more paperwork.
The Days You Can Actually Bill
This is where most maths falls apart. There are 260 weekdays in a year. Take off four weeks of holiday and you are at 240. Take off eight bank holidays and you are at 232. Allow five days for illness, a funeral, a school thing you cannot miss, and you are at 227.
Now take off the days you work but nobody pays you for. Quoting on an evening does not count, but the Saturday morning you spend driving to three survey visits does. Van servicing, the merchant run when they have not picked your order, chasing a supplier about a cylinder, sorting your books, the day the job gets cancelled at 7am.
Be honest and that is roughly one day a week gone. You are down to about 185 billable days, and in a quiet January it will be fewer. Divide your yearly costs by 185, not by 260, or your plumber day rate is built on days that never existed.
Building A Plumber Day Rate From The Bottom Up
Picture an ordinary year for a self employed heating engineer running one van, mostly domestic work, no staff. The overheads might look something like this:
- Van finance: £3,600
- Diesel: £2,600
- Van insurance, tax, servicing, MOT and tyres: £1,500
- Public liability and tools cover: £450
- Tool replacement and consumables: £1,200
- Phone, quoting and invoicing software: £400
- Accountant: £600
- Workwear, PPE and boots: £250
- Tip and waste charges: £300
- Training, tickets and renewals: £600
That comes to £11,500 before he earns anything. Spread across 185 billable days, it is £62 a day just to open the van doors.
Say he wants £45,000 of profit before tax. That is £243 a day. Add the £62 of overhead and the plumber day rate lands at £305. Round it to £320 and you have a little cushion for the week the boiler job falls through.
Notice what that number is not. It is not take-home. Income tax, National Insurance and anything you put in a pension all come out of the £45,000. If you want £45,000 in your pocket, the rate has to be higher again.
Run your own version. Your figures will be different, and the point is not to copy these ones, it is to see the shape of the sum.
Day Rate Or Fixed Price?
Both have their place and the skill is knowing which job is which.
Charge by the day when the scope is genuinely unknown. Chasing a leak through a 1900s terrace where the pipework has been chopped about by four previous plumbers. Lifting floors. Snagging somebody else’s mess. Working alongside a tiler and a sparky on a site where you will spend half the morning waiting.
Fix the price when you have done the job twenty times. A like for like combi swap, a bathroom refit, six radiators and valves, a shower pump. You know the hours, you know the fittings, and a fixed number is easier for the customer to say yes to.
Here is the blunt part. Plenty of domestic customers hear a day rate as an open cheque and they will start watching the clock. That is not a reason to avoid it, but it is a reason to cap it: “It is £320 a day, I reckon two days, and if it runs to a third I will ring you before I carry on.” That one sentence removes most of the argument before it starts.
Where A Plumber Day Rate Leaks Money
The rate is rarely the problem. The leaks are.
- Travel. A job 40 minutes each way eats an hour and a half of your day and a tank of diesel a fortnight. Either build travel into the rate for anything beyond your normal patch, or add a mileage charge and say so up front.
- Half days. You charge half a day for a two hour job and the other half almost never fills. Have a minimum charge, usually half a day, and hold it.
- Free quotes. A survey visit across town costs you fuel and an hour you cannot bill. Quote small jobs over the phone with photos where you can, and save the visits for work worth having.
- Phone advice. The customer from 2022 who rings about their thermostat and keeps you talking for twenty minutes. Two of those a week is a day a month.
- Going back for one part. Every second trip is an unpaid hour. Overstock the van on common fittings and you buy those hours back.
- Waiting on other trades. If the plasterer is not finished you are standing in a hallway on your own money. Get it in writing that a wasted visit is chargeable.
Plug two of those and you have effectively raised your plumber day rate without telling a single customer anything.
Materials, Markup And Who Buys The Boiler
Keep materials out of the plumber day rate entirely. Labour is one line, materials are another, and the customer can see exactly what they are paying for.
A markup of 10 to 20 per cent on materials is normal and defensible. You are carrying the merchant account, the cash flow, the collection and the warranty claim if the pump fails in eight months. If a customer wants to buy their own parts off the internet, that is their call, but say plainly that you will fit them and you will not warrant them, and that a second visit to swap a faulty one is chargeable.
On anything with a big material cost, take a deposit that covers the kit before you order it. There is no sense in a one van business lending a stranger £1,800 for a boiler.
Saying The Number Out Loud
Most underpricing happens in the last four seconds of a conversation. You say the figure, there is a pause, and you fill it by knocking £50 off before the customer has even spoken.
Do not fill the pause. Say the plumber day rate flatly, like you are reading out a postcode, then stop talking. “It is £320 a day plus materials. A job like this is usually two days.” Silence is not an objection. It is somebody doing sums in their head.
Put the same number in writing the same day, with a short line on what is included and what is not. Verbal quotes are where disputes are born.
When Somebody Says You Are Too Dear
Sometimes they are shopping on price and nothing you say will change that. Let them go. The customer who picks the cheapest of four quotes is the same one who queries the invoice and never rings you again anyway.
But if you are losing work you genuinely wanted, the issue is usually not the number, it is that there is nothing to weigh it against. When two plumbers quote £320 and £240 and the homeowner knows nothing about either, price is the only thing left to judge. Give them something else to judge. Photos of the last five jobs, a handful of reviews with names on, your registration numbers, your number on the page. That is why a proper website design for tradesmen pays for itself on one job a year: it stops you being an anonymous number on a list. It is also worth glancing through some examples of sites we have built to see how little it takes to look like the safe choice.
VAT And The Cliff Edge
Turnover creeps up on plumbers faster than on most trades because boilers, cylinders and bathroom suites all run through your books. A year of solid work with materials on your invoices can push you past the registration threshold while your actual earnings stay much the same.
Once you are registered, a domestic customer either pays 20 per cent more or you absorb it out of your margin. Neither is fun, so it is better to see it coming. Check your rolling 12 month turnover every quarter and read the current threshold and the rules on gov.uk rather than relying on a figure somebody quoted in the merchants.
If most of your work is for landlords, letting agents or builders, VAT matters far less, because they reclaim it. If most of it is kitchens and bathrooms for homeowners, it changes your pricing completely, and it is worth an hour with an accountant before you cross the line rather than after.
Nights, Weekends And Emergencies
An emergency call at 11pm on a Sunday is not the same product as a Tuesday morning service, so it should not carry the same plumber day rate. Most one van operators use a call-out fee that covers the first hour, then an hourly rate after it, with a higher band for nights, weekends and bank holidays.
Say the figures on the phone before you turn the key. People in a panic agree to anything and then argue about it once the water has stopped, so get the number agreed while they are still standing in it.
When To Put Your Plumber Day Rate Up
Signs it is overdue:
- You are booked four to six weeks out and turning work away
- You are winning nearly every quote you send, which usually means you are the cheap one
- Merchant prices and your van costs have gone up and your rate has not moved in two years
- You are working Saturdays to hit the number you wanted from five days
Raise it on new quotes only. Never change a price on a job already agreed. Go up in steps of £20 to £30 rather than one leap, and do not announce it or apologise for it. Existing regulars can stay on the old plumber day rate for a few months if it helps you sleep, but put them on the new one by the next season.
You will lose a customer or two. You will also stop doing the jobs that were never worth the diesel.
So What Should A Plumber Day Rate Be?
There is no single national figure, and anybody who gives you one is guessing. Rates in central London and rates in a market town are different worlds, and gas work, unvented cylinders and commercial jobs all sit above general plumbing.
Do two things this week. Work the sum from the bottom up: yearly costs, plus the profit you want, divided by 185 billable days. Then ring three established local firms as a customer and ask what they charge to service a boiler or fix a dripping mixer, so you know where the local ceiling actually sits.
Take the higher of the two numbers, not the lower. The bottom-up figure is the least you can survive on, and the number that keeps you in the trade at 55 with a working back is the one above it.