Part P Building Regulations: Complete Guide for Electricians UK 2026

Part P of the Building Regulations came into force in England and Wales on 1 January 2005. It is the part of the Building Regulations that covers electrical safety in dwellings — residential properties including houses, flats, and associated outbuildings and gardens. Part P requires that certain domestic electrical work is designed, installed, inspected, and tested to BS 7671 (the IET Wiring Regulations) and is notified to the local authority building control.

The core purpose of Part P is to reduce the number of fires, injuries, and deaths caused by substandard domestic electrical work. Before 2005, there was no statutory requirement to notify domestic electrical work to building control or to prove that it complied with any standard. DIY electrical work was widespread, and uninspected substandard installations caused significant harm.

Part P applies to electrical installations in and around dwellings, including:

• Houses, flats, maisonettes, and other domestic premises
• Parts of a building used as a dwelling, including common areas of blocks of flats that are used by occupants
• Outbuildings and gardens associated with a dwelling (sheds, garages, garden lighting, external sockets)
• Conservatories and extensions to dwellings

Part P does not apply to:

• Commercial premises, even if there is a residential element (though the residential part would be covered)
• Agricultural premises
• Common areas of blocks of flats used primarily for circulation purposes by landlords and managing agents

The current Part P document in Approved Document P (2013 edition, as amended) specifies the requirements. All qualified electricians working on domestic installations in England and Wales should have read and understood this document.

Not all domestic electrical work is notifiable under Part P. The 2013 revision of Approved Document P significantly reduced the amount of work that must be notified, focusing mandatory notification on higher-risk work — new circuits, work in bathrooms and other special locations, and work near swimming pools.

Work that IS notifiable under Part P (must be notified to building control or self-certified by a registered competent person):

• Installation of a new circuit: Any new circuit that does not exist in the property — a new ring main, a new lighting circuit, a new radial circuit for a dedicated appliance, a new circuit to a garden building. This is one of the most commonly notifiable categories.
• Replacement of a consumer unit (fuse board): Always notifiable, regardless of the type of consumer unit being installed.
• Any work in a kitchen: New circuits, additions to circuits, or installation of new fixed wired appliances (where these involve a new circuit) in a kitchen are notifiable. Like-for-like socket replacements on existing circuits in kitchens are not notifiable.
• Any work in a bathroom or shower room: Any fixed electrical work in a room containing a bath or shower is notifiable, including replacing ceiling light fittings, fitting extractor fans, and installing electric shower units. The risk of electric shock is higher in wet locations, which is why Part P is particularly strict here.
• Any work outdoors: New circuits or additions to circuits supplying electricity to garden areas, outbuildings, or external fixed equipment are notifiable.
• Any work around a swimming pool or hot tub: In or within the defined zones around swimming pools and hot tubs.
• EV charger installation: Most domestic EV charger installations involve a new dedicated circuit and are therefore notifiable.

A simple rule of thumb: If you are providing a new circuit, or working in a bathroom, kitchen, or outdoor location, assume the work is notifiable unless you have confirmed otherwise. When in doubt, notify — the consequences of failing to notify notifiable work are significant (see Penalties section below).

The 2013 revision of Part P created a clearer category of work that does not need to be notified. This exemption applies to work that is lower risk — typically like-for-like replacements or simple additions to existing circuits in lower-risk locations.

Work that is NOT notifiable under Part P (provided BS 7671 is still complied with):

• Like-for-like replacement of accessories: Replacing a socket outlet, light switch, or light fitting like-for-like on an existing circuit in most rooms (not bathrooms, kitchens, or outdoor) is not notifiable. The replacement must be like-for-like — you cannot install a double socket where there was a single, change a standard socket for an RCD socket, or upgrade to a switched fused connection unit without it potentially becoming notifiable.
• Adding socket outlets or light fittings to an existing circuit in a living room, bedroom, hallway, or landing: Adding a spur to an existing ring main in a bedroom or living room to provide an additional socket is not notifiable, provided the existing circuit is not in a kitchen, bathroom, or outdoor location.
• Replacing damaged cable for a single circuit: Replacing a section of damaged cable that forms part of an existing circuit (not a new circuit) is not notifiable, provided the replacement is like-for-like in specification.
• Fitting a replacement ceiling rose or light fitting in non-special locations: Standard replacement of a ceiling rose or pendant light fitting in a bedroom, living room, or hallway is not notifiable.
• Installing additional lighting points on an existing lighting circuit in non-special locations: Adding a light fitting to an existing lighting circuit in a living room or bedroom is not notifiable.

An important caveat: Even where work is not notifiable under Part P, it must still comply with BS 7671. Failure to meet BS 7671 is not excused by the work being non-notifiable. An electrician cannot carry out substandard non-notifiable work and claim protection from Part P's exemptions. The exemptions from notification are not exemptions from electrical safety standards.

When work is notifiable under Part P, there are two routes to compliance. Understanding both — and why the vast majority of professional electricians use one of them — is important for both your own practice and for advising clients.

Route 1: Registered Competent Person Scheme (the standard professional route)

This is the route used by the overwhelming majority of professional electricians in England and Wales. By joining a government-authorised competent person scheme — NICEIC, NAPIT, ELECSA, or similar — you are assessed as competent to carry out and certify the types of electrical work covered by your registration.

How it works: Scheme-registered electricians can carry out notifiable domestic work and self-certify it without involving the local authority building control. After completing the work, the scheme notifies building control on your behalf. The homeowner receives a Building Regulations Compliance Certificate (sometimes called a Part P certificate) from the scheme, confirming the work has been carried out by a registered competent person.

Advantages of scheme membership:

• No delay — you can complete work and issue the certificate without waiting for a building control inspection
• No building control fee — the fee is covered within your scheme membership fee (a small element per job may apply with some schemes)
• Customer confidence — scheme membership provides an independently verified mark of competence that non-scheme electricians cannot offer
• Commercial requirement — many commercial clients and main contractors will only work with scheme-registered electricians
• Insurance benefits — some insurers offer reduced premiums for scheme members

Current authorised competent person schemes for domestic electrical work:

• NICEIC (National Inspection Council for Electrical Installation Contracting) — the largest and most widely recognised
• NAPIT (National Association of Professional Inspectors and Testers)
• ELECSA (Electrical Contractors' Association Safety)
• STROMA Certification
• BRE Certification (formerly known as CERTASS)

Route 2: Building Control Notification

Electricians who are not registered with a competent person scheme can still carry out notifiable domestic work — but they must notify the local authority building control before the work begins. The building control authority will inspect the work and issue the compliance certificate.

How it works: Submit a building regulation application to the local authority before starting the notifiable work. Pay the applicable fee. Carry out the work. The building control surveyor inspects and, if satisfied, issues the completion certificate.

Disadvantages compared to scheme membership:

• Delay — the building control inspection may not be available immediately, delaying completion for the customer
• Cost — building regulation application fees vary by local authority but are typically £100-£250 for a simple domestic electrical job
• No independent verification of your competence — the inspection verifies the specific job, not your general competence
• Ongoing administrative burden — a separate building control application is needed for each notifiable job

Building control notification is the appropriate route for genuinely non-professional situations (a homeowner doing their own wiring, for example) or for tradespeople who only occasionally carry out domestic electrical work. For anyone doing more than a handful of notifiable domestic jobs per year, scheme membership is almost always more cost-effective and professionally advantageous.

Failing to comply with Part P — carrying out notifiable work without either scheme certification or building control notification — is a serious matter with real consequences for electricians and homeowners alike. The enforcement mechanism operates through several channels.

Enforcement by local authority building control: Local authorities have the power to require that non-compliant work is opened up for inspection, altered, or removed at the owner's expense. An enforcement notice under Section 36 of the Building Act 1984 can be issued within 12 months of the completion of the work, requiring the work to be brought into compliance or removed. This can mean re-opening walls, ceilings, and floors to expose concealed wiring, at significant cost to the property owner.

Impact on property sales: When selling a property, conveyancers routinely search for building regulation certificates for work carried out after 2005. If a consumer unit replacement, new circuit, bathroom electrical installation, or kitchen electrical work cannot be evidenced with either a Part P certificate from a scheme member or a building control completion certificate, the sale can be delayed or fall through. Vendors can be required to retrospectively regularise the work through the local authority — at a higher fee and with an intrusive inspection — or to pay into an indemnity insurance arrangement.

Insurance implications: Many home insurance policies contain clauses voiding cover for fire damage arising from unapproved electrical work. If an electrical fire occurs in a property where non-compliant electrical work was carried out, the insurer may decline or reduce the claim. For landlords, this risk is particularly acute given the mandatory EICR requirements that may identify non-compliant previous work.

Liability for electricians: An electrician who carries out notifiable domestic work without notification, and where that work subsequently causes harm, faces potential prosecution, civil liability, and professional sanction including removal from any competent person scheme they belong to.

Retrospective regularisation: If work was done without notification, the property owner can apply to the local authority for a Regularisation Certificate. The local authority will inspect the work (which may involve making openings to expose concealed wiring) and, if satisfied it complies, issue a certificate. The fee is typically higher than the fee for a prior notification. Regularisation is not available for work that was non-compliant with the regulations at the time it was carried out — it confirms compliance of existing work, not retrospectively excuses non-compliant work.

Homeowners commissioning electrical work are not exempt from Part P — they are on the receiving end of it, and understanding the basics protects them from costly problems. Here is what your domestic clients should know.

Always ask for the Part P certificate: For any notifiable work carried out by a scheme-registered electrician, you should receive a Building Regulations Compliance Certificate issued by the competent person scheme within 30 days of the work being completed. Keep this certificate with your property documents — it will be required when you sell the property and may be requested by your insurer.

Check your electrician is registered: If an electrician tells you they will self-certify the work, verify their scheme membership before they start. Search for them at niceic.com/find-a-contractor or napit.org.uk. A scheme-registered electrician's details, registered address, and scheme membership status are publicly visible. An unregistered electrician cannot legally self-certify notifiable domestic work.

DIY electrical work and Part P: Homeowners can carry out their own non-notifiable domestic electrical work, provided they comply with BS 7671. However, for notifiable work (new circuits, consumer unit replacement, bathroom electrical work, outdoor circuits), a homeowner carrying out the work themselves must notify building control and have the work inspected. DIY consumer unit replacement or bathroom wiring that is not inspected and certificated is non-compliant and creates a property saleability problem.

Beware cheap quotes without certification: Some electricians quote low prices for domestic work by omitting the cost and process of Part P certification. This is either because the work is genuinely not notifiable (in which case the lower price is legitimate) or because they are carrying out notifiable work illegally and passing the risk to the homeowner. Always confirm what certification the quote includes before agreeing to proceed.

Certain installation types come up repeatedly in domestic electrical work and have specific Part P implications that are worth spelling out clearly.

EV Charger Installation

The installation of a domestic EV charger typically involves a new dedicated circuit from the consumer unit to the charge point location — making it notifiable under Part P. Additionally, the Office for Zero Emission Vehicles (OZEV) grant scheme (where available) requires the installer to be registered with an OZEV-authorised scheme. NICEIC and NAPIT both offer EV-specific registration tiers. An EIC must be issued for the new circuit, and the work must be self-certified or building control-notified in the usual way.

Solar PV and Battery Storage

A solar PV system installation involves a new generation circuit and typically modifications to the consumer unit — both notifiable. The installer must be registered with the Microgeneration Certification Scheme (MCS) for the installation to qualify for the Smart Export Guarantee (SEG) tariff. MCS registration requires electricians to hold appropriate qualifications and be registered with a competent person scheme.

Bathroom Electrical Work

All fixed electrical work in a room containing a bath or shower is notifiable. This includes replacing ceiling lights, installing extractor fans, fitting electric shaver points, and installing heated towel rails with a mains supply. Even replacing a like-for-like ceiling pendant in a bathroom is notifiable. BS 7671 defines zones within bathrooms where different types of electrical equipment are permitted — always apply the zoning requirements correctly.

Garden Buildings and Outbuildings

Installing an electrical supply to a garage, shed, garden office, or summerhouse requires a new circuit from the main installation and is notifiable. The supply must be via an RCD-protected circuit, the wiring must be suitable for its environment (outdoor-rated cables, correct burial depth for buried cables), and the installation in the outbuilding is also subject to BS 7671 requirements. An EIC must cover the complete installation from the distribution board to the final circuit points in the outbuilding.

For any electrician doing significant volumes of domestic work, joining a competent person scheme is the obvious professional step. Here is what the application process typically involves and what ongoing membership entails.

The application process (NICEIC as an example):

1. Application and eligibility check: Submit an application confirming your qualifications, experience, and the types of work you want to register for. NICEIC requires at minimum a Level 3 qualification in electrical installation, a current 18th Edition certificate, and appropriate inspection and testing qualifications.
2. Technical assessment: An assessor visits your premises (or a current job site) to assess technical competence. They review documentation (certification records, risk assessments), inspect tools and test equipment (verified calibration), and may ask technical questions or observe work in progress.
3. Insurance verification: Proof of valid public liability insurance (minimum £2 million) is required. Professional indemnity is also required for some registration tiers.
4. Registration and payment: If the assessment is satisfactory, you are registered and pay the annual membership fee. NICEIC membership fees vary depending on the registration tier and number of operatives but are typically in the range of £350-£700+ per year for a sole trader, higher for firms with multiple operatives.

Ongoing membership obligations:

• Annual inspection — an assessor visits at least once per year to review certification records, tool and equipment calibration, and ongoing competence
• Keeping qualifications current — the 18th Edition qualification must be renewed when a new edition is issued
• Maintaining insurance — membership can be suspended if your public liability insurance lapses
• Notifying the scheme of changes — changes in scope of work, employment of additional operatives, change of business address

Scheme membership is not a one-off assessment — it is an ongoing relationship that provides both a mark of competence and a professional accountability framework. The cost of membership is typically recoverable within a small number of notifiable jobs, given that the scheme covers the building control notification process that would otherwise require individual applications and fees.