Part P Building Regulations: A Plain-English Guide for Electricians

Part P trips up more electricians than it should. Most of the confusion comes down to two simple questions: is this job notifiable, and who tells building control? Get that wrong and you can leave a customer with non-compliant work, an awkward conversation at resale, and a hit to your reputation.

This guide explains Part P in plain English: what it covers, when you need to notify, your options for staying compliant, and the paperwork that proves you did things properly.

What Part P Actually Is

Part P is the section of the Building Regulations (for England and Wales) that deals with electrical safety in dwellings. It exists for one reason: to make sure fixed electrical installations in homes are designed and installed so they don't cause fire or injury.

A common myth is that Part P is a "qualification" or a "wiring standard". It isn't. The technical standard for the work itself is BS 7671 (the IET Wiring Regulations). Part P sits on top of that and is about who must be told when certain electrical work happens in a home, and how that work gets certified.

Two things worth being clear on:

• Part P applies to dwellings — houses, flats, and certain associated buildings like garages and outbuildings. Commercial and industrial work falls under different rules.
• Scotland and Northern Ireland have their own building standards systems, so Part P as written doesn't apply there. If you work across borders, check the relevant national rules.

Because the regulations are updated from time to time, always work from the current official Approved Document P rather than an old printout or something a mate told you years ago.

Notifiable vs Non-Notifiable Work

This is the heart of it. Some electrical work in a home must be notified to building control; some doesn't. "Notifiable" simply means a building control body needs to be informed so the work can be certified and recorded.

As a rough guide, the bigger or higher-risk jobs tend to be notifiable. Historically this has included things like:

• A new consumer unit (fuse board) replacement
• A new circuit being installed
• Most work in "special locations" such as inside the zones around a bath or shower

Smaller jobs — like adding a socket or a light to an existing circuit (outside special locations), or like-for-like repairs and replacements — have generally not been notifiable. But the exact boundaries have shifted over the years and can be read differently by different building control bodies.

Tip: if you're ever unsure whether a job is notifiable, treat it as if it is and check the current Approved Document P before you start. It's far cheaper than retro-certifying after the fact.

For a worked example of one of the most common notifiable jobs, see our guide on how to price a consumer unit replacement — it covers the certification side as well as the numbers.

Your Three Routes to Compliance

For notifiable work, there are broadly three ways to stay on the right side of the regulations.

1. Self-certify through a Competent Person Scheme. If you're registered with a scheme such as NICEIC or NAPIT, you can certify your own notifiable work and have it notified to building control on your behalf. For most working electricians, this is the cheapest and fastest route. Our NICEIC vs NAPIT comparison breaks down which scheme suits which type of business.
2. Notify building control directly before you start. If you're not in a scheme, you can tell your local authority building control ahead of the work. They'll inspect and certify, but you'll usually pay a fee and the timeline is slower.
3. Use a registered third party. A registered electrician or approved inspector can assess and certify the work. This tends to be the most expensive route and is generally a fallback rather than a plan.

For anyone doing regular notifiable domestic work, scheme membership is almost always the sensible choice. If you're not registered yet, our guide on how to become a registered electrician walks through the steps.

The Certificates That Prove Compliance

Part P compliance lives or dies on paperwork. The job can be perfect, but if you can't produce the right certificate, you can't prove it — and that paperwork is what protects you and your customer.

The two documents you'll reach for most often:

• Electrical Installation Certificate (EIC) — for new installations, new circuits, and bigger alterations.
• Minor Electrical Installation Works Certificate (MEIWC) — for smaller additions and alterations to an existing circuit that don't extend to a whole new circuit.

Knowing which one applies matters, because using the wrong certificate undermines the whole record. We've got a full breakdown in Minor Works Certificate vs EIC: when to use each.

On top of the certificate, notifiable work should generate a Building Regulations Compliance Certificate, which your scheme issues once the notification goes through. Customers often need this when they sell the property, so it's worth telling them to keep it safe.

Keeping the Paperwork Straight Without the Headache

The compliance is one thing; staying organised is another. Lost certificates, forgotten notifications, and "which version of the cert did I send?" are the kinds of admin slips that turn a clean job into a problem months later.

This is where a job-management system earns its place. Storing every certificate against the right job and customer means you can pull up proof in seconds — handy when a customer calls a year later asking for their compliance certificate for a sale. Keeping certificates and job records in one place also makes you audit-ready if a scheme assessor ever asks to see your records.

The same setup helps on the commercial side too: quote, certificate, and invoice all live against one job, so nothing slips through the cracks and you spend less of your evening chasing paperwork.

FAQs

Is replacing a consumer unit notifiable under Part P?

Replacing a consumer unit in a dwelling has generally been treated as notifiable work, meaning it must be certified and notified to building control. Always confirm against the current Approved Document P, as the detail can change.

Do I need to be registered with a scheme to do Part P work?

No. You can do notifiable work without scheme membership, but you'll then need to notify building control directly before starting, which usually costs more and takes longer. For regular domestic work, joining a Competent Person Scheme is normally the cheaper, faster route.

Does Part P apply in Scotland?

No. Scotland operates under its own building standards system rather than the Part P used in England and Wales. Northern Ireland also has separate arrangements, so check the rules for the nation you're working in.

What happens if Part P work isn't notified?

Unnotified notifiable work can leave the installation non-compliant on record, which often surfaces during a property sale. It can usually be regularised after the fact through building control, but that's slower and more expensive than doing it right the first time.