Steve runs a plumbing company in Birmingham. He has four vans on the road. His calendar is booked three weeks ahead. He works six days a week. He turned over £340,000 last year.
He paid himself £38,000.
His accountant showed him the numbers in January. After wages, materials, van costs, insurance, fuel, marketing, and overheads, his net margin was 11 percent on a good month. Several months it was below 8 percent.
He was running a business that looked successful from the outside and was quietly draining him from the inside. He was not poor at his trade. He was not lazy. He was pricing jobs based on what he thought the market would accept rather than what it cost him to deliver them. And he had never once sat down to calculate what a job actually cost him before he quoted for it.
The Pricing Problem That Busy Contractors Never See Coming
The busiest contractors are statistically not the most profitable. This sounds wrong. More work should mean more money. In practice, high volume at the wrong margin produces high revenue and low profit, combined with the personal cost of running at maximum capacity with no room to breathe.
The root cause is a pricing methodology that most tradespeople use by default: quote based on what you think the client will accept, check roughly what competitors charge, add a number that feels reasonable for the job, and send it over.
This methodology has no connection to the actual cost of delivering the job. It has no margin target built into it. It does not account for all the costs that exist at the job level, including the marketing spend that generated the enquiry, the time spent quoting, the admin time, or the share of overhead that every job needs to carry.
When those uncounted costs are added up, the profit on a job that felt like a win is often a fraction of what the contractor assumed. Sometimes it is negative.
The Four Costs That Most Contractors Never Include When Pricing
The Real Cost of Labour Including All On-Cost
Most contractors price labour based on their techs’ hourly wage. A plumber on £18 per hour working four hours on a job is £72 in labour. Simple.
That number is wrong. The real cost of an employed worker is their wage plus employer national insurance contributions, pension contributions, holiday pay, sick pay, tool allowance, and uniform costs. The true on-cost for a worker at £18 per hour is typically £22 to £26 per hour when all employment costs are included. On a four-hour job, that is £88 to £104, not £72.
When this is multiplied across every job on every van every week, the underestimation of labour cost is the single largest source of margin erosion in most trade businesses.
The Cost Per Job of Running the Business
Every job your business completes must carry a proportional share of your fixed overhead costs: van depreciation and finance, insurance, tools and equipment, office rent or home office costs, software subscriptions, accounting fees, and your own time managing the business.
The way to calculate this accurately is to add up all your monthly fixed overhead costs, divide by the number of jobs you complete per month, and add that figure to every job quote as a non-negotiable overhead recovery charge.
Most contractors have never done this calculation. They absorb overhead as a vague cost that gets swallowed by the business and wonder at the end of the year why the turnover number and the bank balance look so different from each other.
The Marketing Cost Per Acquired Job
If you spend £1,200 per month on Google Ads and generate 15 jobs from them, your marketing cost per job is £80. That £80 needs to be reflected in your pricing. It is a real cost of acquiring that customer.
Most contractors track their ad spend as a monthly total and never connect it to individual job profitability. When it is accounted for at the job level, it changes the minimum viable quote for jobs acquired through paid channels specifically.
The Time Cost of Quoting, Travelling, and Administration
A job that takes four hours on-site typically involves 30 to 45 minutes of travel each way, 20 minutes of quoting and communication, and 15 minutes of invoicing and admin. The true labour time per four-hour job is closer to six and a half hours.
When pricing is based on on-site time only, the 2.5 hours of surrounding time is given away for free on every job. For a business running 80 jobs per month, that is 200 hours of unbilled time. At an effective rate of £25 per hour, that is £5,000 per month in value that exists and is not being charged for.
The Minimum Viable Price Formula
Calculating the minimum price at which a job is actually profitable requires four inputs:
Total labour cost (true on-cost, including all on-site and surrounding time) plus materials at cost plus overhead recovery per job plus target profit margin.
The target profit margin is a decision, not a calculation. For a sustainable trade business, a minimum net margin of 25 to 30 percent per job is what creates the ability to weather slow months, invest in equipment, and pay the owner a real salary. Building the margin target into the minimum price rather than hoping it materialises from the gross revenue is the fundamental shift that changes the profitability of a busy trade business.
When Steve ran this calculation, he discovered that his current average job quote was covering his visible costs and leaving almost nothing for overhead recovery and profit. His minimum viable price on a typical half-day plumbing job was approximately 22 percent higher than what he had been quoting.
He was concerned about losing clients. He raised his prices by 18 percent over three months, communicating the change honestly with existing customers and presenting it as a reflection of the quality and reliability of his service.
He lost two clients who were purely price-shopping. He retained everyone else. His turnover in the following year dropped by 8 percent. His net profit more than doubled.
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Digiwolves works with contractors and trade businesses across the US and UK. Google Premier Partner certified.
