How to Price Plumbing Jobs: A Practical Guide for UK Plumbers

One of the biggest decisions you will make on every job is whether to quote a fixed price or charge a day rate. Both have their place, and getting this right is key to running a profitable plumbing business.

Fixed Price Quoting

A fixed price means you give the customer a single figure for the complete job — labour and often materials included. The customer knows exactly what they are paying, and you know exactly what you are earning (assuming nothing goes wrong).

Best for:

• Boiler installations — you can accurately predict the time and materials
• Bathroom installations — where you have surveyed the space and know the scope
• Standard replacements — cylinder swaps, radiator installs, toilet replacements
• Any job where you have done similar work many times and can predict the duration confidently

Advantages:

• Customers love fixed prices — it removes uncertainty and makes it easy for them to compare quotes
• You can build in a healthy margin because the customer is paying for certainty
• If you work faster than expected, you earn more per hour
• Fewer disputes about billing

Risks:

• If the job runs over, you absorb the extra time
• Unexpected issues (rotten joists, incorrect pipe sizes, access problems) eat into your profit
• You need accurate surveying and quoting skills

Day Rate Charging

With a day rate, you charge the customer for each day (or half day) you spend on site, plus materials on top.

Best for:

• Repair and maintenance work where the scope is unclear
• Diagnostic work — finding leaks, investigating heating problems
• Jobs in older properties where you know there will be surprises
• Ongoing work for regular customers (landlords, letting agents) where trust is already established

Advantages:

• You are protected if the job takes longer than expected
• No need for detailed quoting — saves you time upfront
• Works well for trusted customer relationships

Risks:

• Customers may feel anxious about an open-ended cost
• You can look expensive if a job finishes quickly (customer feels they overpaid for a half-day rate)
• Harder for customers to compare your quote against fixed-price competitors

The golden rule: Use fixed prices when you can predict the job accurately. Use day rates when you cannot. If in doubt, quote a fixed price with a clear exclusion clause for unforeseen work.

Many plumbers set their prices based on what others charge, or just pick a number that "feels right." This is a mistake. You need to know your actual costs so you can set prices that deliver a genuine profit.

Step 1: Work Out Your Annual Overheads

Add up everything you spend in a year that is not directly tied to a specific job:

• Van costs: Finance/lease (£3,000-£6,000), fuel (£3,000-£5,000), insurance (£1,500-£2,500), servicing and MOT (£500-£1,000), parking and tolls (£500-£1,500 in cities)
• Insurance: Public liability, professional indemnity, tools cover (£500-£1,000)
• Tools and equipment: Replacements, new purchases, calibration (£500-£2,000)
• Marketing: Website, Checkatrade, Google Ads (£1,000-£3,000)
• Phone and admin: Mobile contract, accounting software, accountant fees (£1,000-£2,000)
• Training: Gas Safe renewal, new courses (£500-£1,500)
• Clothing and PPE: Work boots, hi-vis, branded clothing (£200-£500)

A typical sole trader plumber has annual overheads of £12,000-£25,000. Write yours down. Be honest.

Step 2: Determine Your Billable Days

You will not work 365 days a year. Realistically:

• 52 weeks minus 5 weeks holiday = 47 weeks
• 47 weeks x 5 days = 235 potential working days
• Minus sick days, quiet periods, quoting time, admin: roughly 200-220 billable days

Use 210 days as a sensible planning figure.

Step 3: Set Your Target Income

Decide what you want to take home after tax. For example, if you want to take home £40,000:

• Tax and NI on £40,000 take-home means you need roughly £52,000-£55,000 gross profit (depending on your structure and allowances)
• Add your overheads: £55,000 + £18,000 = £73,000 needed from billable work
• Divide by billable days: £73,000 / 210 = £348 per day

That is your minimum day rate to achieve a £40,000 take-home. If you are charging less than this, you are either working more days than you think or earning less than you want.

Step 4: Add Your Profit Margin

Your day rate should include a profit margin on top of costs. This is money that stays in the business for growth, equipment upgrades, or a buffer for quiet periods. A healthy margin is 15-25% on top of your costs. Using the example above: £348 x 1.20 = £418 per day.

Here are realistic 2026 pricing examples for common plumbing jobs in the UK (outside London — add 20-30% for London). These include labour only; materials are charged on top.

Repair and Maintenance

• Fix a dripping tap: £60-£90 (30-60 minutes)
• Replace a tap (pair): £80-£120 (1-2 hours)
• Unblock a drain: £80-£120 (1-2 hours)
• Fix a running toilet: £60-£100 (30-60 minutes)
• Replace a toilet: £120-£180 (2-3 hours)
• Repair a burst pipe: £100-£200 (1-3 hours, depends on access)
• Fix a leaking radiator valve: £60-£100 (30-60 minutes)

Installation Work

• Full bathroom installation (labour only): £1,800-£3,500 (5-8 days depending on complexity)
• En-suite installation: £1,200-£2,500 (3-5 days)
• Combi boiler replacement (like-for-like): £500-£800 labour (1 day)
• Combi boiler installation (full system change): £800-£1,500 labour (1.5-2.5 days)
• Install a radiator (including pipework): £180-£300 (half day to full day)
• Fit an electric shower: £150-£250 (half day)
• Fit a thermostatic mixer shower: £200-£350 (half to full day)
• Replace an immersion heater: £100-£160 (1-2 hours)
• Install an outside tap: £100-£160 (1-2 hours)

Servicing

• Boiler service: £70-£100 (45-60 minutes)
• Landlord Gas Safety Certificate (CP12): £60-£90 per property
• Full heating system powerflush: £350-£600 (full day)

Important: These are guide prices. Your local market, your experience, and your overheads should dictate your actual pricing. Do not copy these numbers blindly — use the cost calculation method above to work out what you need to charge.

Not every job should be priced the same way. There are situations where quoting at the higher end of your range — or even above it — is both justified and smart.

Emergency and Out-of-Hours Work

If a customer calls you at 9pm on a Saturday because their boiler has broken down or a pipe has burst, your rate should reflect the disruption. Most plumbers charge 1.5x to 2x their normal rate for evening, weekend, and bank holiday call-outs. This is standard across the trade and customers expect it. Make sure your out-of-hours pricing is clearly communicated on your website and voicemail.

Jobs You Do Not Want

If you are busy and a job comes in that does not excite you — awkward access, a customer who seems difficult, or a type of work you do not enjoy — price it high. If they accept, you are well compensated for the inconvenience. If they decline, you have not lost a job you wanted.

Complex or Risky Work

Jobs in old properties, where asbestos might be present, where you are working in tight spaces (under floors, in loft spaces with limited headroom), or where previous work has been done badly all carry extra risk. Price accordingly. Add a contingency of 10-20% to cover surprises.

When You Are Fully Booked

If you have three weeks of work lined up, raise your prices. Simple supply and demand. If a customer really wants you specifically, they will pay the premium. If not, you have not lost anything — you were already busy.

Every plumber faces the "that seems a lot" conversation. Here is how to handle it professionally without dropping your price.

Be Transparent About What Is Included

Break your quote down so the customer can see what they are getting. Instead of "bathroom install: £2,500," show them the daily rate, estimated number of days, what each day covers, and list the specific tasks. When customers can see the work involved, the price makes more sense.

Explain the Value

Remind them that your price includes your qualifications, insurance, guarantee on work, clean-up, and compliance with building regulations. A cheaper plumber who is not Gas Safe registered, not insured, and does not guarantee their work is not a like-for-like comparison.

Do Not Apologise for Your Prices

Confidence in your pricing signals competence. If you immediately start offering discounts or looking uncomfortable when a customer questions your quote, they lose confidence in you. State your price, explain the value, and let them decide.

Offer Alternatives, Not Discounts

If the price genuinely is too high for the customer's budget, offer to adjust the scope rather than drop your rate. For example: "I can install the basin and toilet for £X, and you could tile the walls yourself to save on labour." This keeps your rate intact while helping the customer.

Know When to Walk Away

Some customers will always want the cheapest price. That is fine — they are not your customer. You want customers who value quality, reliability, and professionalism. Let the bargain hunters go to someone else, and focus on building a client base that pays your rates without argument.

A good rule of thumb: if you are winning every single job you quote for, your prices are too low. Aim for a conversion rate of around 60-70% — this means your pricing is competitive but not giving money away.