Invoice Template for Plumbers: Free Guide + Best Practices

Why Plumbers Need a Proper Invoice Template

You have just spent two hours under someone's kitchen sink replacing a corroded waste pipe. Your hands are dirty, your knees hurt, and the last thing you want to think about is paperwork. But sending a professional invoice is what separates a business from a hobby - and it is what gets you paid on time.

A good invoice template saves you time, looks professional, and makes sure you never forget to charge for something. This guide shows you exactly what to include and gives you best practices specifically for plumbing businesses.

What Every Plumbing Invoice Must Include

Your Business Information

At the top of every invoice, include:

• Your business name (or your name if you operate as a sole trader)
• Your address
• Phone number and email
• KVK number (if you are in the Netherlands)
• BTW-id / VAT number
• Your logo (optional, but it looks professional)

Client Information

• Client's full name or company name
• Service address (where the work was done - this might differ from their billing address)
• Phone number or email

Job Details

This is where many plumbers fall short. Do not just write "plumbing work" and a total. Break it down:

Labour charges:

• Date the work was performed
• Description of the work (be specific)
• Hours worked or fixed price for the job
• Hourly rate (if billing by the hour)

Materials:

• List each material separately
• Include quantities
• Show the unit price

Other charges:

• Call-out fee (if applicable)
• Emergency/after-hours surcharge
• Travel costs (if charging separately)
• Disposal fees for old materials

A Sample Plumbing Invoice Breakdown

Here is an example for a bathroom renovation job:

Subtotal: €766.60

BTW 21%: €160.99

Total: €927.59

Notice how every line item is clear and specific. The client can see exactly what they are paying for, which reduces disputes and speeds up payment.

Hourly Rate vs Fixed Price: Which Is Better?

This is one of the biggest decisions plumbers face when invoicing.

Hourly Rate

Pros:

• You get paid for every minute you work
• Fair for jobs where the scope is uncertain (diagnostics, old buildings with surprises)
• Easy to calculate

Cons:

• Clients might feel anxious watching the clock
• Can lead to disputes ("it should not have taken that long")
• Punishes you for being fast and experienced

Typical hourly rates for plumbers in the Netherlands (2026):

• Standard hours: €45–€75 per hour (excl. BTW)
• Evening/weekend: €65–€100 per hour
• Emergency call-out: €85–€120 per hour

Fixed Price

Pros:

• Clients know the cost upfront - no surprises
• Rewards efficiency (the faster you work, the higher your effective hourly rate)
• Easier to quote and compare

Cons:

• Risk of underquoting if the job is more complex than expected
• Need experience to price accurately

Our recommendation: Use fixed pricing for standard jobs (tap replacement, toilet install, radiator flush) and hourly for diagnostics, troubleshooting, and complex renovations where the scope is hard to predict. Always state which method you are using on the invoice.

How to Mark Up Materials

Most plumbers buy materials and charge them to the client. The question is: do you mark them up?

The industry standard is a 15–25% markup on materials. This covers:

• Your time sourcing and purchasing materials
• Transport to the job site
• Warranty handling if something is defective
• Stock holding costs

For example, if you buy a tap for €120 from your wholesaler, you might charge the client €145 (approximately 20% markup). This is completely normal and expected.

Important tips:

• Be transparent. If a client asks, explain that the markup covers sourcing and handling.
• For expensive items (boilers, water heaters), some plumbers charge at cost plus a separate installation fee. This can look better on the invoice.
• Always keep your purchase receipts for tax purposes.

Professional Invoice Tips for Plumbers

1. Send Invoices the Same Day

The moment you finish a job, send the invoice. Every day you delay is a day you delay getting paid. With mobile invoicing apps, you can create and send an invoice from your van before you drive to the next job.

2. Take Photos of Completed Work

Before and after photos serve two purposes: they protect you against disputes, and they look great attached to the invoice. Some invoicing tools let you attach images directly.

3. Use Clear Payment Terms

State your payment deadline clearly: "Payment due within 14 days." For larger jobs, consider requiring a deposit (30–50% upfront) before starting work.

4. Include Your Bank Details Prominently

Make it easy for clients to pay. Put your IBAN in a clearly visible spot. If you accept card payments or iDEAL, mention those options too.

5. Number Your Invoices Sequentially

Use a consistent format like YEAR-NUMBER (e.g., 2026-001, 2026-002). This keeps your records clean and is a legal requirement in the Netherlands.

6. Add a Personal Touch

A simple "Thank you for your business" at the bottom of the invoice goes a long way. You are a tradesperson who deals with people face to face - your invoice should reflect that relationship.

Common Plumbing Invoice Mistakes

• Not listing materials separately: Clients want to see what they are paying for. A single line saying "materials €200" looks suspicious.
• Forgetting the call-out fee: If you charge for showing up, put it on the invoice. Do not surprise the client.
• No job reference or address: Always include where the work was done. This helps with both record-keeping and any warranty claims.
• Handwritten invoices: We get it - you are busy. But handwritten invoices look unprofessional and are easy to lose. Switch to digital.

Save Time with Invoice Software

Creating invoices from scratch every time is tedious. A good invoicing tool lets you:

• Save client details for repeat customers
• Set up templates with your standard rates
• Calculate BTW automatically
• Send reminders when invoices are overdue
• Track which invoices are paid and which are not

As a plumber, your time is better spent fixing pipes than fiddling with spreadsheets. A proper invoicing tool pays for itself after the first late payment it helps you avoid.