Invoicing for electricians

Invoice Koi is an invoice app for electricians: your own rates in a price book, the call-out and the testing as lines you tap.

Make an invoice free

The iPhone app is coming to the App Store.

An illustration of cable coiled beside a voltage tester, side cutters, three downlights and a breaker, with a koi swimming among them.

An electrical job is rarely one line. There is a first fix weeks before the second, a consumer unit that is its own conversation, testing at the end, and a call-out that may or may not turn into work. By the time the certificate is written the invoice is the last thing anybody wants to be building out of a notes app.

01On the document

What electricians
put on an invoice.

Save these items with your own rates. Tap to add them to an invoice, with the unit, price and totals filled in.

Line	Unit
Electrical labour	hrs
Call-out and assessment	each
Consumer unit replacement	each
Downlight, LED dimmable	each
Socket or switch, additional	each
Testing and certification	each
Materials and consumables	job

Set your own prices. The app's starter rates are placeholders. To bill one job today with nothing installed, the free electrician invoice template opens in your browser with these lines on it.

A job, grouped Subtotals per section

FIRST FIX

Electrical labour£960

Cable and back boxes£320

Subtotal£1,280

SECOND FIX

Electrical labour£720

Downlights, 8 × LED dimmable£560

Sockets and faceplates£280

Subtotal£1,560

TEST AND CERTIFY

Testing and certification£180

Subtotal£180

Total£3,020

Grouped line items work on all nine templates.

A photograph of an electrician kneeling at an open consumer unit in a half-finished hallway, phone in one hand.

02Why electricians use it

Three things that
save the evening.

Your rates, not a guess at them

The price book holds your hourly rate, your call-out, your downlight price. One tap puts the item, the unit and the price on the line, and the totals resolve underneath.

First fix and second fix on one invoice

Group the lines under headings with their own subtotals, so a customer reading the document can see what the rewire cost and what the lights cost without asking you to break it down.

Written in the loft, sent from the van

Everything is on the phone. You can build the whole invoice standing in a plant room with no bars and it is there, complete, when you get back to the road.

03 · Questions

Asked by electricians.

Can I turn an electrical estimate into an invoice?

Yes. An accepted estimate converts to an invoice with the lines, the client, the tax and your terms carried across, so a job that was quoted in March bills in April without being retyped.

Does it work without an internet connection?

Yes. Create invoices, estimates and PDFs offline on your phone. AI, cloud backup and payment collection need an internet connection.

Do I need an account to use it?

No account is needed for core invoicing. Sign in for cloud backup, a second device or payment collection. Payments also need Stripe setup. Subscriptions use your App Store or Google Play account.

Weighing up apps? Invoice Koi vs Joist and Invoice Koi vs Contractor+ set the features side by side, including where they win. Or see all 12 comparisons.