The short answer
Yes. Replacing a consumer unit is notifiable work under Part P of the Building Regulations in England and Wales. This means the work must comply with the Building Regulations and the compliance must be formally recorded. In practice, the way this is handled is that a registered (competent-person) electrician carries out the work, self-certifies it, notifies the local authority's building control via their scheme, and issues the homeowner both an Electrical Installation Certificate (EIC) and a Building Regulations compliance certificate. A non-registered person doing the work must notify building control before starting and have it inspected after. Doing the work without any notification is a breach of the Building Regulations.
Building regulations are not just about structural changes — certain electrical work in dwellings has required formal approval since 2005. A consumer unit replacement is one of the jobs that falls within scope.
Building regs and consumer units
- Is it notifiable?Yes — in England and Wales
- RegulationPart P of the Building Regulations 2010
- Standard the work must meetBS 7671 18th Edition wiring regulations
- Usual routeRegistered electrician self-certifies
- Documents receivedEIC + Building Regulations compliance certificate
What Part P is and why it covers consumer units
Part P of the Building Regulations came into force in England and Wales in 2005. It requires certain electrical work in dwellings to comply with specific standards and to be recorded through a formal process — because incorrectly wired electrical installations in homes cause fires, shocks and fatalities.
The regulation defines some electrical work as 'notifiable' because it poses the greatest safety risk. Replacing a consumer unit is explicitly included in the notifiable categories. The legal basis is that a consumer unit controls the protection for every circuit in a home: an incorrectly wired or unprotected board affects the safety of the entire electrical installation.
Part P requires notifiable work to comply with BS 7671 (the wiring regulations) and to be certified — either by a registered competent person who self-certifies, or by building control following an inspection.
The two routes to compliance
There are two legitimate routes for notifiable work under Part P:
- Competent-person scheme (the usual route): an electrician registered with a government-authorised scheme — NICEIC, NAPIT, ELECSA, STROMA, BRE Group, or others listed on the government's website — carries out the work. Their registration authorises them to self-certify that the work complies with BS 7671 and the Building Regulations. They notify the work via their scheme, which informs the local authority's building control. The homeowner receives the EIC and the Building Regulations compliance certificate without needing to deal with building control directly. This is the route used for the overwhelming majority of consumer unit replacements.
- Building control notification (less common): the person doing the work notifies the local authority building control department before work starts. Building control (or an approved inspector) arranges an inspection after completion. If the work passes, a completion certificate is issued. A fee is charged. This route is used when, for example, a company or person is not registered under a competent-person scheme but is competent to carry out the work and wishes to proceed through the formal building-control channel.
Both routes result in formal confirmation that the work complies with the Building Regulations. Neither route is available to a person who simply does the work without notification.
What happens if building regulations are not complied with
A consumer unit replacement carried out without Part P compliance has several consequences:
- Enforcement: local authorities have powers to require uncertified notifiable work to be inspected and, if non-compliant with the regulations, remedied at the owner's cost. There is no time limit on enforcement action for Building Regulations breaches.
- Property sale: conveyancing searches routinely flag electrical work that lacks building-control compliance. A missing Building Regulations certificate for a consumer unit replacement is a common cause of delays or complications in property transactions. It can require retrospective inspection, indemnity insurance, or remedial work.
- Insurance: buildings and contents insurance policies typically require that the home's electrical installation is maintained in accordance with current standards. An uncertified installation may affect a claim.
The Building Regulations compliance certificate is not a technicality — it is evidence that the safety-critical work was done correctly and inspected. For a consumer unit replacement, always insist on receiving both it and the EIC before final payment.
| Situation | What it means for you |
|---|---|
| Registered electrician does the work | Self-certifies; you receive EIC + Building Regs certificate |
| Unregistered person notifies building control first | Building control inspects; completion certificate issued if compliant; fee charged |
| Work done without any notification | Breach of Building Regulations; enforcement and conveyancing risks |
| Retrospective certification needed | Registered electrician inspects existing work; may require remedial work to pass |
Outcomes under different approaches to Part P compliance. Sources: Part P of the Building Regulations; NICEIC guidance.
Part P in Scotland, Wales and Northern Ireland
Part P applies specifically in England and Wales. The other UK nations have their own building-standards systems:
- Scotland: the Building Standards system in Scotland requires a building warrant for certain electrical work. The rules are different from Part P. Consult Building Standards Scotland or the relevant local authority for guidance.
- Wales: Wales adopted the same Part P framework as England and it applies in the same way.
- Northern Ireland: Technical Booklet P sets out the electrical requirements under the Building Regulations (Northern Ireland). The process and the registered-contractor schemes differ from England. Confirm requirements with Building Control Northern Ireland.
Frequently asked questions
Does a consumer unit replacement need building regulations approval?
Yes. In England and Wales it is notifiable work under Part P of the Building Regulations. The usual route is a registered (competent-person) electrician who self-certifies the work and notifies building control via their scheme. You receive an Electrical Installation Certificate and a Building Regulations compliance certificate.
Do I need to contact building control myself for a consumer unit replacement?
Not if you use a registered (competent-person) electrician — they handle the Part P notification via their scheme on your behalf. You only need to contact building control directly if the work is being done by an unregistered person via the building-control notification route.
How long does the Building Regulations certificate take to arrive?
The Building Regulations compliance certificate is typically issued by the competent-person scheme within a few weeks of the work being notified. If you have not received it within six weeks of the work being completed, follow up with your electrician or the scheme directly.
Sources & further reading
- GOV.UK — Part P: electrical safety in dwellings (Approved Document P)
- Electrical Safety First — replacing a consumer unit (best practice guide)
- NAPIT — Part P competent person scheme
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property and installation. They are guidance, not a quotation.