Invoicing for locksmiths

Invoice Koi is an invoice app for locksmiths, so a night call-out leaves behind a numbered document rather than something torn off a pad.

Make an invoice free

The iPhone app is coming to the App Store.

An illustration of a euro cylinder, a bunch of blanks, a pick set, a hole saw and a mortice lock case, with a koi swimming among them.

A locksmith is paid at the worst moment of somebody else's day, standing at a door they cannot open, often at two in the morning. That is exactly when a handwritten figure on a duplicate book reads as a number made up on the spot, and exactly when there is no time to go back to a desk and write it up properly.

01On the document

What locksmiths
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
Call-out, standard hours	each
Call-out, out of hours	each
Locksmith labour	hrs
Euro cylinder, supplied and fitted	each
Mortice lock, supplied and fitted	each
Key cutting	each
Safe opening	each

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

A job, grouped Subtotals per section

ATTEND

Call-out, out of hours£90

Subtotal£90

ENTRY

Non-destructive entry, 45 mins£60

Subtotal£60

HARDWARE

Euro cylinder, anti-snap£55

Keys cut, 3£18

Subtotal£73

Total£223

Grouped line items work on all nine templates.

A photograph of a locksmith at a front door at night fitting a new cylinder, headtorch on, work van at the kerb.

02Why locksmiths use it

Three things that
save the evening.

No signal on a doorstep at 2am

The whole invoice is written on the phone and the PDF is drawn on the phone. A basement car park with no bars changes nothing: the invoice is finished there and sent when the signal comes back.

Two call-out rates, both already in it

Standard hours and out of hours live in the price book as separate lines with their own prices. You pick the one that applies rather than working it out at the door.

Handed over before you drive off

They sign it on your phone, and the PDF goes to them from your own phone by whatever they use: message, mail, whatever is to hand. Koi never sends anything to your customer itself.

03 · Questions

Asked by locksmiths.

Can it handle an out of hours call-out rate?

Yes. It is a separate price-book line rather than a calculation, so the night rate is the line you choose and the customer sees which one they were charged.

Can I invoice on the doorstep with no phone signal?

Yes. Every figure is worked out on the device and the PDF is drawn there too, so the invoice is finished before you leave the step. AI, cloud backup and payment collection need an internet connection.

Can I bill an estate agent monthly instead of per visit?

Yes. Put the visits on one invoice as separate lines, or set a recurring invoice for a retained arrangement and add the extras before you send it.

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