Two halves, two layouts
Diagnostic work is sold as time and reads as a short narrative: what was wrong, what you tested, what you found. Invoicing for electrical work covers how to price and word that half, and it is worth reading before you write your first one.
Installation is the opposite. It is countable, repetitive, and the customer can literally walk around and check it — so the layout that works is a list of places and quantities, not a paragraph.
List installation room by room
Going room by room is the single best decision you can make about the layout of an electrical invoice. “Kitchen — 3 × double socket, existing circuit” is a line the customer verifies by standing in their kitchen. The same work described as “electrical installation works” is a number they can only accept or dispute.
It also survives the awkward conversation later. When somebody asks in February what the garage circuits cost, you are reading a line that says exactly which room and how many, not reconstructing a total.
Where a device took materially longer than the rest — a run through a finished ceiling, a chased wall, an outbuilding — that gets its own line rather than a quietly higher per-device price. The total comes out the same, and nobody has to work out why the sockets in one room cost more than the sockets in another.
Say where the fixture came from
Customers buy their own light fittings. It is normal, it is often cheaper for them, and it changes what you are standing behind.
Supply and install means the fitting is yours: you chose it, you priced it, and if it fails you deal with it. A customer-supplied fixture is theirs, and the line should say so — your labor is warranted, the fitting is not. It matters more here than in most trades, because the failure mode of a cheap fitting is not a drip.
The other case worth a line is the fitting that arrives damaged or incomplete. If you could not install it, say what happened and what you did instead. A blank on the invoice where a light should be is a phone call you will have to take.
Itemise the fittings, roll up the sundries
Nobody wants a line for every cable clip, and pretending to price them individually makes the document longer without making it clearer. The convention that works: fittings and accessories individually, with counts, and everything else as a single materials line — cable, back boxes, connectors, fixings.
Where a permit or inspection fee applies, that is somebody else’s money and goes on at what it cost you, with the authority named. Charge for the time you spent filing and meeting the inspector if you want to, but as labor, on its own line.
Example
A small install across three rooms
Locations and counts rather than a paragraph, the customer's own fittings marked, sundries in one line, and the certificate referenced rather than reproduced.
- Kitchen — 3 × double socket, existing circuitSupply and install, chased and made good
- $285.00
- Kitchen — under-cabinet lighting, 4 fittingsInstall only; fittings supplied by the customer
- $210.00
- Hallway — 2 × light switch replacedSupply and install
- $70.00
- Materials and sundriesCable, back boxes, connectors and fixings
- $96.30
- Total due
- $661.30
Invoice INV-0143 · 22 Cheswick Road · Work carried out 14–15 October · One customer-supplied fitting arrived damaged and was not installed; the replacement was fitted on the second visit at no extra charge · Test certificate MW-2291 issued separately · Net 7, due 22 October.
Staged jobs
A rewire or a service upgrade bills across weeks, usually with money up front for materials and a payment when the cable is in and before the walls close. Each of those invoices needs the same three numbers a builder’s does — the agreed total, what has been billed already, what is left — the contractor invoice template lays that arithmetic out and there is no reason to write it differently for electrical work.
Where electrical invoices go wrong
- “Electrical works” as the only line. Uncheckable, and useless to you in a year.
- No locations. Counts without rooms cannot be walked around.
- The customer’s own fittings invisible. You have silently taken on a warranty you were never paid for.
- A marked-up permit fee. Pass-through costs go on at cost; charge your time separately if you want it.
- No certificate reference. The one detail a buyer, insurer or landlord will come back for.
Making the document
The free invoice generator handles the layout above: a line per location with a quantity and a rate, a single materials line, tax if you charge it, and notes long enough for the certificate reference and the dates. It builds the PDF in the browser, uploads nothing, and adds no watermark.
For the work you quoted before you started, what goes on an estimate covers the document that comes first — particularly the exclusions, which on electrical work are usually the difference between a price and an argument.
