Invoicing App for Electricians: Stage Payments, Materials and Retention

Electrical invoicing has to cover a ten-minute call-out and a six-week rewire with stage payments. Tell Mythex how you charge and it builds an invoicing app with labour and materials on separate lines, stage invoices, certificate fees, retention on commercial work and an unpaid list.

Who it's for

Electricians invoicing from a template or a notebook, firms funding materials for big jobs until the final payment, and contractors doing commercial work with retention.

What you can build

Stage invoices at first fix, second fix and completion
Labour and materials on separate lines
Certificate fees where you charge them
Retention held and released on commercial contracts
Call-out charges with a minimum period
An unpaid list sorted by days overdue

Get paid at first fix

On a rewire, materials are bought early and first fix is a big share of the labour. Invoice a stage payment when first fix is done instead of waiting for completion, and you stop funding the whole job yourself.

Deposit or materials payment
First fix
Second fix and completion

Labour and materials apart

Customers question totals more than lines. Separate labour from materials, and list major items, like a consumer unit or charger, with the serial number. It makes disputes rare and warranty claims easy.

Retention on commercial work

Main contractors often hold back a percentage until the defects period ends. Record retention on each invoice, the release date and the amount still held, so it does not quietly go unclaimed.

What to set up first

Your rates, call-out minimums, tax settings and stage percentages. Then add open jobs with what has already been invoiced, so the unpaid list is right from day one.

A prompt to start from

Build an invoicing app for my electrical contracting business. Invoices separate labour and materials, list certificate fees, and support stage invoices for rewires (30% first fix, 40% second fix, 30% completion). Add call-out invoices with a 1-hour minimum, 5% retention on commercial jobs with a release date, tax per line, PDF invoices and a list of unpaid invoices by days overdue.

Questions

Can I invoice by stage on bigger jobs?

Yes. Set up stages like first fix, second fix and completion, each with its own invoice.

Can customers pay online?

Yes, through a payment provider you connect with your own account, such as Stripe. Each invoice can carry a pay link.

Does it work with my accounting software?

You can export invoices as CSV for import. A direct connection depends on whether your accounting software offers an API you connect.

Can quotes turn into invoices?

Yes. Build quotes in the same project and ask for an accepted quote to create the job and its stage invoices.

Do I need to code?

No. You describe how you charge and Mythex builds the app. You change it by chatting.

Templates to start from

Fintech Payments Site Template — Tiered pricing, blog, animations
Plumbing Business Site Template — Quote calculator with lead dashboard
AI Trip Planner Template — Chat itineraries with billing-ready UI
Invoice Generator Template — Canvas invoicing with PDF export
Cloud Storage SaaS Template — Marketing site, billing UI, and 2FA
Freelance Invoicing Template — Saved clients with revenue stats
Quote Generator Template — Line-item pricing, secure client links