How to Invoice for Labour and Materials

What is a labour and materials invoice?

A labour and materials invoice is an invoice that separates the cost of work from the cost of materials used during a job.

Labour may be charged by the hour, by the day, or as a fixed amount. Materials may include parts, products, equipment, supplies, fittings, and other items purchased or used to complete the work.

Showing these costs separately makes the invoice easier to review and helps the customer see how the final balance was calculated.

When should you invoice for labour and materials?

Labour and materials invoices are commonly used when the final cost of a job depends on the amount of time worked and the items required.

They are often used by:

• Builders and construction businesses
• Electricians
• Plumbers
• Carpenters
• Mechanics
• Home repair businesses
• Landscapers
• Painters and decorators
• Installers
• Maintenance contractors

Separate labour and materials clearly

Labour and materials should normally appear as separate invoice line items. Combining everything into one general charge can make the invoice harder for the customer to understand.

For example, instead of writing kitchen repair work for £520, the invoice could show eight hours of labour at £45 per hour, replacement timber costing £95, fittings costing £30, and waste removal costing £35.

This breakdown gives the customer a clearer explanation of the total amount due.

How to show labour costs on an invoice

A labour line item should explain the work completed and how the charge was calculated.

If the work is charged by the hour, include the number of billable hours and the hourly rate. If a fixed labour price was agreed, show the task and the agreed amount.

Useful labour details may include:

• The type of work completed
• The number of hours or days worked
• The hourly or daily rate
• The date the work was completed
• The property or job location
• The project stage or task completed

Labour invoice example

A simple labour charge could be shown as six hours of electrical installation work at £50 per hour, producing a labour total of £300.

If different tasks have different rates, they should appear on separate lines. For example, installation labour and emergency callout time may be charged differently.

Separate line items make it easier for the customer to check each charge.

How to show material costs on an invoice

Material line items should describe the exact products, parts, or supplies used. Where possible, include the quantity and unit price.

Avoid using a broad description such as materials unless the customer has already agreed to a single fixed materials charge.

A clearer breakdown might include copper pipe, replacement valve, electrical cable, timber boards, paint, screws, or vehicle parts as separate items.

Material invoice example

A plumbing invoice might include two metres of copper pipe at £12 per metre, one replacement valve costing £28, and pipe fittings costing £16.

The customer can then see the quantity, rate, and total for each item.

This is particularly useful when several different materials were required to complete the job.

Should you add a markup to materials?

Some businesses add a markup to materials to cover ordering time, transport, storage, handling, and the risk of purchasing incorrect or unused items.

Any markup should be agreed with the customer or clearly covered by the quotation, contract, or payment terms.

The invoice can show the final customer price for each material. There is not always a need to display the original supplier cost unless this was part of the agreement.

Include delivery and equipment costs

Some jobs involve additional costs such as delivery, equipment hire, travel, parking, waste disposal, or specialist tool charges.

These costs should be listed separately and described clearly. For example, the invoice could include scaffold hire, skip hire, delivery of materials, or equipment rental.

Clear descriptions prevent additional charges from appearing unexpected.

How to handle receipts and expenses

Customers may request receipts for materials or reimbursable expenses, especially when a business is charging the exact purchase cost.

Keep supplier receipts and other supporting records for your own bookkeeping. Copies can be provided when required by the customer or the terms of the project.

The invoice should still include a clear summary of each expense rather than relying only on attached receipts.

Add tax correctly

Tax should be applied according to the rules that affect your business and the products or services being supplied.

Labour and materials may sometimes be taxed in the same way, but this can vary depending on the country, industry, and transaction.

Show the subtotal, tax amount, and final balance clearly so the customer can understand the calculation.

Match the invoice to the quote or estimate

Before sending the invoice, compare the labour and material charges with the original quote, estimate, or contract.

If the final amount is higher because more time or materials were required, explain the additional work clearly. Ideally, changes should be approved by the customer before they are added to the final invoice.

This helps reduce disputes and prevents the customer from being surprised by the total.

Review the invoice before sending

Check every labour hour, rate, material quantity, and price before sending the invoice. Make sure no item has been entered twice and confirm that all completed work has been included.

Review taxes, discounts, deposits, and previous payments as well. The remaining balance should be easy for the customer to identify.

An accurate invoice is more likely to be approved without delay.

Create a clear labour and materials invoice

A good labour and materials invoice should explain the work completed, the time charged, the materials used, and any additional project costs.

Separating each charge into clear line items gives the customer a full breakdown and creates a useful record for the business.

Using accurate descriptions, quantities, rates, and totals can reduce questions, prevent payment disputes, and make the invoice easier to pay.