How to Invoice as a Self-Employed Electrician in the UK

Self-employed UK electricians juggle more invoicing flows than almost any other trade. A typical week might include an EICR on a rental property, a remedial work invoice to the same landlord, a consumer unit replacement direct-to-homeowner, a commercial M&E CIS subcontract first-fix on a new-build site, and a one-off socket replacement on emergency call-out. Each flow wants something different from the invoice. This guide walks through the practical rules.

What every electrician invoice must include

The HMRC baseline first — every invoice needs:

• Your business name and address
• Customer name and address
• Unique sequential invoice number
• Invoice date and supply date (if different)
• Clear description of work
• Amount due and payment terms
• Bank details and/or payment link
• VAT registration number, rate, and amount (if VAT-registered)

Trade-specific: your registration number

Your Part P registration scheme number (NICEIC, NAPIT, ELECSA, or in Scotland SELECT) belongs on every invoice — and on every EICR certificate, Minor Works certificate, and Installation Certificate. Customers (particularly landlords and letting agents doing due diligence) look for it; some won't pay invoices that don't show registration.

Set your registration once and it should print in the footer of every document automatically. Manually retyping it per invoice is error-prone (a single digit wrong in your NICEIC number on a CP12-equivalent EICR is a real problem when a landlord later needs to evidence compliance to their lettings agent).

EICR invoicing

An EICR (Electrical Installation Condition Report) is the standard inspection for rental properties — 5-yearly under the 2020 regulations for private rented sector, more frequently if previously found defective. EICR invoicing is typically standalone (no remedials in scope), with the certificate as a separate document.

• Invoice line: 'EICR on [property address] — £[amount]'
• Attach the certificate as a separate PDF (don't merge with the invoice — landlords need them filed separately)
• If C2 codes were found, send the EICR invoice now and quote separately for remedial works — don't bundle
• For landlord portfolio EICR batches (5+ properties), invoice as a multi-property invoice with each address on its own line

EICR + remedial work — separate or combined?

Two reasonable approaches:

1. Send the EICR invoice immediately on completion of the inspection. Quote separately for the remedial works, get landlord acceptance, do the work, then invoice for remedials only. Cleaner separation; landlord can claim each cost in different periods if useful.
2. Bundle on one invoice with two clear line items: 'EICR — £180' and 'Remedial works (item list) — £450'. Faster if the landlord wants one document; standard for portfolio relationships where the landlord trusts the quoting process.

Most independent electricians use approach 1 for new customers (build trust through clear pricing) and approach 2 for repeat landlord relationships (faster admin).

Consumer unit replacement and full rewires

Higher-ticket residential work (consumer unit replacement £500-£1,100; full rewire £3,500-£7,500) usually warrants a staged-payment quote rather than a single invoice on completion:

• Quote stage 1: 30% deposit on commencement (covers materials lead-time)
• Quote stage 2: 50% on first-fix completion (rough wiring in)
• Quote stage 3: 20% on certification and final test

The 30% deposit is also a fairness check on the customer — anyone unwilling to commit a deposit on a £6,000 rewire is more likely to drag their feet on the final invoice. Stage payments protect cash flow on the higher-ticket work.

Commercial CIS subcontract M&E work

If you subcontract to a main contractor on a commercial M&E job (very common on UK new-build pipelines and regeneration sites), CIS applies. The 20% deduction is taken from your labour element only — never materials, plant hire, or fuel.

If both parties are VAT-registered (almost always the case on commercial), reverse-charge VAT applies. You don't add VAT to the invoice; the main contractor accounts for it on their own VAT return. Wedge formats CIS reverse-charge invoices correctly when you flag the job in the WhatsApp message.

Landlord portfolio batches

Landlords and letting agents with 5+ properties usually want one invoice covering multiple addresses (each on its own line) rather than 5 separate invoices. Easier for their property accounts reconciliation. Format:

• Invoice line 1: 'EICR + remedials at 14 Acacia Avenue — £230'
• Invoice line 2: 'EICR + consumer unit replacement at 22 Elm Road — £540'
• Invoice line 3: 'EICR at 8 Beech Close — £180'
• Subtotal, VAT (if registered), total

Wedge generates multi-property invoices when you mention multiple addresses in your WhatsApp message. Each property gets its own line; one consistent invoice number for the agent's reconciliation.

Emergency call-out invoicing

Higher rates for emergency or out-of-hours work need to be visible on the invoice. Don't hide an enhanced rate in the total — break it out as a separate line:

• 'Emergency call-out (Sunday) — £120'
• 'Labour (2 hours at £85/hr) — £170'
• 'Materials — £45'

Customers can't dispute an enhanced rate they explicitly agreed to. Customers can dispute a single line of £335 that looks like opportunistic pricing. Same-day invoicing matters here too — send before you leave the property, while urgency justifies the rate.

Building Control notification fees

If you're notifying through your scheme (Part P self-certification), include the BC notification fee as a separate invoice line: 'Building Control notification fee — £90'. Customers see it isn't a hidden margin on your labour. If the work doesn't need BC notification, don't add a fake line — that's invoice fraud.

MTD and digital records

From April 2026, sole-trader electricians earning £30,000+ in turnover need to keep digital records and file quarterly under MTD for Income Tax. Wedge stores every invoice and expense as a digital record from creation; CSV exports go straight into FreeAgent, Xero, QuickBooks, or any HMRC-recognised filing tool. No spreadsheet reconstruction at year-end.