Gas Engineer Invoice App — Invoice by Voice in Seconds

Built for Gas Safe registered engineers. Just speak your job — boiler service, gas safety check, landlord CP12, installation — and TraderInvoice creates a complete, professional invoice instantly. Includes your Gas Safe registration number and CIS formatting. Send before you leave the property.

Start Free — No Credit Card Required

Free plan includes 5 invoices per month · Used by Gas Safe engineers across the UK

Built for Gas Safe Engineers

Gas Safety Certificate Invoices

Invoice for CP12 annual landlord gas safety records in seconds. The invoice captures your Gas Safe registration number, property inspected, appliances checked, and certificate reference number. Issue it to the landlord while you are still at the property.

Boiler Service and Installation Invoices

Speak your boiler work details — make and model, parts replaced, labour hours — and TraderInvoice builds a complete invoice. Labour and materials are always separated, which is essential for any CIS subcontract work.

Landlord Portfolio Management

Build a library of landlord clients and their properties. When you return for the annual service, your previous invoice details are already there. Annual renewal reminders help you capture recurring income without a paper-based reminder system.

CIS-Ready for Subcontract Work

Many gas engineers work as CIS subcontractors on new builds and commercial sites. TraderInvoice separates labour and materials automatically and includes your UTR number. The contractor deducts 20% from labour only — not materials — saving you money.

What You Say vs What Gets Invoiced

You speak

"Invoice for Mr Henderson at 14 Maple Close. Annual gas safety check for boiler and gas fire. Labour 1.5 hours at £75. Certificate reference GS-2026-44521. Gas Safe number 654321. Payment due 14 days."

Invoice created

Labour — gas safety check (boiler + gas fire)£112.50

Total£112.50

Gas Safe: 654321 · GSR: GS-2026-44521 · Due: 14 days

All the Gas Work You Invoice, Covered

✓Annual boiler service

✓Landlord gas safety record (CP12)

✓Boiler installation (new/replacement)

✓Gas fire service and repair

✓Gas hob installation

✓Gas pipe pressure test

✓Emergency gas work

✓Radiator installation

✓Underfloor heating (gas)

✓Heating system power flush

✓Gas safety inspection (commercial)

✓New build gas installation

🎁 Get 1 month free when you upgrade

Use code 04TI26 at checkout on Starter or Pro. Pay for one month, get two.

Use Code 04TI26 →

Gas Engineer Invoicing Questions

What must I include on a gas safety certificate invoice?: Your Gas Safe registration number, the property address inspected (which may differ from the billing address), the appliances inspected, a reference to the Gas Safety Record issued, and all standard invoice elements. TraderInvoice includes your Gas Safe number from your account settings on every relevant invoice automatically.
Can I invoice a landlord and a letting agent separately?: Yes — some landlords have invoices sent directly to their letting agent for payment. When you create the invoice, use the letting agent's details as the billing address and note the property inspected separately. TraderInvoice supports separate billing and property addresses.
How do I handle CIS deductions on gas engineering invoices?: If working as a subcontractor (e.g. on new build sites), your invoice must clearly separate labour and materials. CIS deduction of 20% applies to labour only — not materials, not Gas Safe charges. TraderInvoice always separates these when you mention them as distinct items in your voice recording.
How quickly should I send a gas safety invoice?: The same day — ideally before you leave the property. Landlords managing multiple properties often pay faster when invoices arrive promptly, as they process paperwork in batches. TraderInvoice lets you send the invoice via email or WhatsApp from your phone in under 60 seconds.