How to Invoice as a Contractor
Contractors who wait until the whole job is finished to send one giant bill often wait even longer to get paid. Learning how to invoice as a contractor means splitting labour, materials and progress claims so the client can check each stage. This guide is for trades, builders and independent contractors who need a paper trail that matches the site work.
Start With the Job, Not a Vague Service Line
Put the site address or job name on the invoice. Then list labour by trade or by agreed stage, and list materials separately. If the client issued a purchase order, copy that number onto the invoice. A missing PO is a common reason a contractor invoice sits unpaid. See purchase order vs invoice if you need the difference.
| Item | Example |
|---|---|
| Labour | First-fix plumbing, 12–14 May, 18 hours |
| Materials | Pipe, fittings and fixings as agreed |
| Progress claim | Stage 2 of 4, 40% of contract value |
| Variations | Extra bathroom extract fan, approved 16 May |
Progress Claims and Variations
For longer jobs, invoice by stage instead of waiting for handover. Each progress invoice should state which stage it is, what percentage of the contract it covers and what has already been billed. That is the same idea as deposit and milestone invoicing.
Variations need their own lines and a written approval date. Mixing extra work into the original labour line makes disputes likely.
Tip: Photograph completed stages and keep supplier receipts. You do not attach every photo to the invoice, but you can send them if the client queries a line.
Make the PDF Easy for the Site and the Office
Site managers want the job name. Accounts wants the PO, tax and bank details. Put all of that on one page. Our invoice generator can include tax on each line, notes and payment instructions so the office does not have to chase you for missing fields. For tax layout basics, see what a tax invoice is.
A contractor invoice should let someone who never visited the site still understand what was built and what is due.
Watch out: Construction billing and retention rules differ by country and contract type. Confirm local requirements before you rely on this as a legal template.
Frequently Asked Questions
Should materials include my markup?
Only if the contract allows it, and then show it clearly. Hidden markup on materials is a frequent source of arguments.
Can I invoice weekly?
Yes, if the client agreed. Weekly labour invoices work well on time-and-materials jobs. Fixed-price jobs usually follow stages instead.
What if the client withholds retention?
Show the retention as a deducted line and invoice it when the defects period ends, as the contract says.
Need a job invoice today? Create a free contractor invoice and download the PDF.