How Much Do Plumbing Businesses Earn in the UK? [2026 Data]

A sole-trader plumber's earnings depend on their hourly rate, billable hours, and overhead costs. The realistic range:

Minimum viable: A plumber charging £50/hour and working 1,200 billable hours/year generates £60,000 gross revenue. After overheads of £10,000–£15,000, profit before tax is £45,000–£50,000. After income tax and National Insurance (assuming sole trader), take-home is approximately £30,000–£35,000.

Typical established sole trader: A plumber charging £65–£75/hour and working 1,300–1,400 billable hours/year generates £85,000–£105,000 gross revenue. After overheads, profit before tax is £70,000–£90,000. Take-home as a sole trader (or via limited company salary + dividends): £48,000–£65,000.

High-earning sole trader: A specialist plumber (heat pumps, commercial gas, luxury bathroom installations) charging £80–£100+/hour in a high-demand area can generate £120,000–£160,000+ gross revenue. After overheads, take-home in the range of £70,000–£90,000+.

These figures assume domestic and light commercial work. Plumbers taking on significant commercial contracts can earn considerably more, but the cash flow requirements and overheads also increase.

Once a plumbing business employs staff, turnover figures look very different from sole trader earnings:

• 1-person business: £50,000–£120,000 turnover, £35,000–£75,000 profit before tax
• 2-person business: £120,000–£220,000 turnover, £35,000–£65,000 owner's profit (after second person's salary)
• 4-person business: £250,000–£450,000 turnover, £40,000–£90,000 owner's profit (after all salaries)
• 8–10 person business: £600,000–£1,200,000 turnover, £60,000–£150,000 owner's profit

Note that turnover growth doesn't translate linearly to profit growth — each new employee adds revenue but also adds cost (salary, NI, pension, van, tools, management overhead). Well-run plumbing businesses achieve net profit margins of 15–25% at scale; poorly run businesses can see margins fall below 10% as they grow.

The plumbing businesses that earn significantly above average share several characteristics:

Specialisation — Plumbers who specialise in heat pump installation, underfloor heating, commercial gas, or luxury bathrooms command premium rates. Specialist knowledge is scarce; scarce skills command higher prices. A heat pump installer with MCS certification charges 30–50% more per hour than a general plumber.

Commercial work — Commercial maintenance contracts, facilities management work, and new-build plumbing pay higher rates and provide more predictable income than domestic one-off jobs. Day rates of £400–£700 are common in commercial plumbing.

Emergency premium — Plumbers who are reliably available for emergency work and price it appropriately (1.5–2x standard rates) earn significantly more per hour than those who only do standard-hours work.

Geography — London and the South East command hourly rates 30–50% higher than the national average. A plumber doing identical work in Central London versus Stoke-on-Trent earns dramatically different annual incomes.

Pricing confidence — The biggest difference between high-earning and average-earning plumbers of similar skill is often simply the confidence to charge market rate. Undercharging is endemic in the trade.

Useful benchmarks for a UK plumbing business in 2026:

• Materials as % of turnover: 20–35% for typical domestic/light commercial work. Higher for large installation projects, lower for service and repair work.
• Labour cost as % of turnover (for businesses with employees): 45–55%. Higher labour percentages (60%+) typically indicate undercharging or under-utilisation.
• Overhead as % of turnover: 10–20% for a well-run small plumbing business. Red flag if it exceeds 25%.
• Net profit margin: 15–25% is healthy. Under 10% is concerning and usually indicates pricing, overhead, or cash flow problems.
• Revenue per employee (including owner): £80,000–£120,000/year. Businesses below £60,000/employee are typically underpricing or have efficiency problems.