What is Part P and when does it apply to an electrician's invoice?

Part P of the Building Regulations covers the design, installation, inspection, and testing of electrical installations in dwellings. Most new electrical work in homes (new circuits, consumer unit replacements, rewires, work in kitchens, bathrooms, and outdoors) must be either self-certified by a registered competent person or inspected by Building Control. As a NICEIC or NAPIT registered electrician, you self-certify your work, issue an Electrical Installation Certificate (EIC), and register the work with your scheme. This certification process has a cost — which you should include in your invoice.

Can I charge for Part P registration separately on an invoice?

Yes — you can either include the certification cost within your total price (most common for smaller jobs) or show it as a separate line item on your invoice. Showing it separately — 'Part P registration and EIC: £XX' — makes the value transparent and helps customers understand why your price is higher than an unregistered electrician. It also establishes a paper trail that the registration was completed.

What is an EICR and how do I invoice for it?

An Electrical Installation Condition Report (EICR) is a periodic inspection report assessing the safety of an existing electrical installation. It is required every 5 years for rental properties (and at every change of tenancy) and recommended every 10 years for owner-occupied homes. Invoice for an EICR as a standard service invoice, including your NICEIC/NAPIT registration number, the property address, and the certificate reference number. Typical domestic EICR charges are £100–£300 depending on size of property and region.

Do I need to include my NICEIC number on every invoice?

It is not a legal requirement on every invoice, but it is strongly recommended for any work that involves Part P notifiable installations. It demonstrates your registered status, builds customer confidence, and supports any future queries about the certification. For non-notifiable work (minor repairs, like-for-like replacements), it is still good practice. TraderInvoice can store your registration number and include it automatically on every invoice.

Part P Electrician Invoice UK: What to Include & How to Charge (2026)

What Part P Work Must Be Invoiced Correctly

The following work is notifiable under Part P and should be invoiced with your competent person scheme registration number and a reference to the Electrical Installation Certificate issued:

⚡New circuits (additional lighting, power, consumer unit circuits)

⚡Consumer unit (fuseboard) replacements

⚡Full and partial rewires

⚡Electrical work in kitchens (within 600mm of a sink)

⚡Electrical work in bathrooms and shower rooms

⚡Garden/outdoor electrical installations

⚡EV charger installations

⚡Solar PV and battery storage

⚡Electric vehicle supply equipment

⚡Work in garages and outbuildings

Minor works — replacing socket faceplates, changing light fittings (like-for-like), fixing faults in existing circuits — are not notifiable and do not require an EIC, though a Minor Electrical Installation Works Certificate (MEIWC) is best practice for most repair work.

What to Include on a Part P Invoice

Required

NICEIC / NAPIT / ELECSA registration number

State your registration number prominently. Customers can verify at niceic.com or napit.org.uk.

Required

Property address of the installation

May differ from the billing address (e.g. for landlords, agents).

Required

Reference to EIC/MEIWC issued

Include the certificate reference number. The certificate is a separate document; the invoice references it.

Recommended

Note that work has been or will be registered with Part P scheme

'This installation will be registered with NICEIC under Part P of the Building Regulations.'

Best practice

Labour and materials as separate line items

Essential for CIS subcontract work. Good practice for all invoices.

Optional

Certification charge (if shown separately)

Some electricians include this as a visible line item; others absorb it in the total.

Consumer Unit Replacement: Example Invoice

INVOICE

Smith Electrical Ltd

NICEIC Reg: 654321

Invoice: INV-0112

Date: 9 June 2026 · Due: 23 June 2026

For

Ms T Williams

18 Cedar Avenue, Bristol BS1 4QR

(Installation at same address)

Labour — consumer unit replacement, circuit testing (5 hrs @ £75/hr)£375.00

Materials — Wylex 17th Edition dual-RCD 18-way board, MCBs, RCDs£195.00

Materials — cable, connectors, consumables£28.00

Part P registration and Electrical Installation Certificate (EIC)£45.00

Total due£643.00

EIC reference: EIC-2026-8821 · NICEIC job registered · Bank: Smith Electrical · 12-34-56 · 87654321

How Much to Charge for Part P Registration

Certificate type	Typical charge to customer
Electrical Installation Certificate (EIC)	£30–£60 if shown separately, or absorbed in total
Minor Electrical Installation Works Certificate (MEIWC)	£0–£25 (often included in labour)
Electrical Installation Condition Report (EICR) — 2-bed property	£100–£180
EICR — 3–4 bed property	£150–£280
EICR — 5+ bed or commercial	£250–£500+

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Frequently Asked Questions

What is Part P and when does it apply to an electrician's invoice?: Part P of the Building Regulations covers the design, installation, inspection, and testing of electrical installations in dwellings. Most new electrical work in homes (new circuits, consumer unit replacements, rewires, work in kitchens, bathrooms, and outdoors) must be either self-certified by a registered competent person or inspected by Building Control. As a NICEIC or NAPIT registered electrician, you self-certify your work, issue an Electrical Installation Certificate (EIC), and register the work with your scheme. This certification process has a cost — which you should include in your invoice.
Can I charge for Part P registration separately on an invoice?: Yes — you can either include the certification cost within your total price (most common for smaller jobs) or show it as a separate line item on your invoice. Showing it separately — 'Part P registration and EIC: £XX' — makes the value transparent and helps customers understand why your price is higher than an unregistered electrician. It also establishes a paper trail that the registration was completed.
What is an EICR and how do I invoice for it?: An Electrical Installation Condition Report (EICR) is a periodic inspection report assessing the safety of an existing electrical installation. It is required every 5 years for rental properties (and at every change of tenancy) and recommended every 10 years for owner-occupied homes. Invoice for an EICR as a standard service invoice, including your NICEIC/NAPIT registration number, the property address, and the certificate reference number. Typical domestic EICR charges are £100–£300 depending on size of property and region.
Do I need to include my NICEIC number on every invoice?: It is not a legal requirement on every invoice, but it is strongly recommended for any work that involves Part P notifiable installations. It demonstrates your registered status, builds customer confidence, and supports any future queries about the certification. For non-notifiable work (minor repairs, like-for-like replacements), it is still good practice. TraderInvoice can store your registration number and include it automatically on every invoice.