Competent Person Schemes: Which Installers Can Self-Certify Their Own Work

Most building work on a UK home, from a new consumer unit to a replacement boiler, a set of windows or a solar array, is subject to building regulations. Normally that means an application to a building control body and an inspection before and after the work. But there is a second route: an installer registered with a competent person scheme can self-certify that their own work complies, notify the local authority themselves, and hand you a certificate, all without a building control application. Competent person schemes are, in the words of GOV.UK, "a way for tradespeople to prove their ability to carry out certain work to required standards, instead of you applying for building regulations approval"¹.

The practical effect for a householder is simple. Use a registered installer for work the scheme covers and "you do not need to get approval yourself"². The installer deals with compliance, notification and the paperwork. Use an unregistered one, and either the firm or you must notify the local authority in advance, pay a fee, and have the work inspected³. Membership is voluntary, so the question of who is registered, and for which trade, is one worth checking before work starts, not after⁴.

The purpose behind these schemes

Competent person schemes were created to close a gap between the building regulations and the reality of ordinary home improvement work. The regulations apply to a wide sweep of household projects: putting up a new building, extending or altering an existing one, and providing services or fittings such as hot water cylinders, drainage, replacement windows and fuel burning appliances of any type⁶. Requiring every one of those jobs to go through a formal building control application would overwhelm local authorities and add cost and delay to routine work carried out by skilled tradespeople.

The scheme answer is to place the proof of competence with the installer rather than the job. An installer who joins a scheme is approved to self-certify certain types of building work, and the government authorises the schemes themselves and lists which trades each one covers⁷. Before approval, "your work will be assessed to check you meet the level of competence required"⁴. The householder then gets compliance handled by someone whose competence has already been tested, and the local authority gets notified of the work without an application.

The system is also being extended as home energy work grows. The government's Future Homes and Buildings Standards consultation response records that Approved Documents have been significantly amended to state that a competent person scheme should be used when undertaking a heat pump or mechanical ventilation installation, and that for installing mechanical ventilation and air conditioning systems in dwellings there are currently four registered competent person schemes: BESCA, Blue Flame Certification, Certsure and NAPIT⁷. For a household investing in low-carbon heating, the schemes are becoming the standard route to compliance, which makes understanding them part of buying well.

Building control or self-certification: two ways to comply

Every notifiable job has two possible routes to a compliant outcome, and they end in the same place: work that meets the building regulations, recorded with the local authority. The difference is who does the checking.

Route one: building control. The work is notified to the local authority or a registered building control approver before it starts, a fee is paid, and an inspector checks the job against the regulations. This is the default for anyone not registered, and installers can still use local council or private inspectors if they prefer⁴.

Route two: self-certification. A registered installer is approved to carry out the work to comply with building regulations without involving local authority building control⁸. The installer certifies their own work, notifies the local authority, and issues you a compliance certificate. Customers do not have to get a local council or a private approved inspector to check the work⁴.

Two points of responsibility matter here. First, self-certification is genuinely instead of approval, not an addition to it: "This is instead of getting building regulations approval"⁴. Second, the ultimate legal exposure sits with the owner. The Planning Portal states that "if you are the owner of the building, it is ultimately you who may be served with an enforcement notice if the work does not comply with the regulations", and that where you employ a builder the responsibility will usually be theirs, but this should be confirmed at the very beginning⁶. Choosing a registered installer is how a household shifts the compliance burden onto someone assessed and inspected for the purpose; choosing an unregistered one leaves the paperwork, the fee and the risk closer to home.

Part P: electrical jobs requiring notification or self-certification

Electrical work in homes is the classic case. The Building Regulations set standards for electrical installation work in relation to dwellings, covering houses and flats, and in England and Wales the rules apply to electrical work in your home or garden⁹. They do not set standards for the safety of appliances themselves, but they do require that fixed connections of appliances are safe⁹.

Checking that notifiable electrical work is safe can be done in one of two ways: by using an electrician registered with a competent person scheme, or by notifying the building control section of the local authority⁹. The registered route means the electrician "is registered by an organisation authorised by the Secretary of State and is able to certify the work as safe without notifying Building Control"⁹. Council guidance describes the same arrangement: electricians become registered with an approved self-certification organisation, a government approved scheme, and members "are allowed to certify their own work and they will tell the Council that the work has been properly installed and tested"¹⁰.

The scope is broad. All new electrical work in a dwelling, including a house, flat or small commercial premise linked to domestic accommodation, must be designed and installed to account for Part P of the Building Regulations⁵. Electrical work in new dwellings and extensions to existing dwellings is notifiable unless the installer is a member of a Competent Persons Self Certification Scheme¹⁰. Where the building control route is used instead, councils require a copy of the installer's Electrical Installation Test Certificate compliant with BS7671 to be obtained and supplied to the local authority¹¹, and Wigan Council's guidance on the amended Part P likewise treats an electrical installation certificate issued under the Competent Person Scheme as one route to discharging the requirement¹². The Planning Portal's advice to householders is the same in substance: it is best to use an installer registered with a competent person scheme, a registered competent person, who can self-certify¹³.

Trades covered by each scheme

There is no single scheme for everything. Schemes are authorised per trade, and the government lists which schemes are authorised for which types of work⁷. An installer's registration only counts for the work their scheme actually covers, which is why official guidance advises checking "your installer is a member of a scheme covering the work they will be undertaking"¹⁴.

For electrical work, the schemes named in council guidance on solar installations include NAPIT, ELECSA and NICEIC¹⁵. Cambridgeshire's ECO4 Flex guidance gives a flavour of how the names stack up across energy work: an installer part of a competent person scheme like MCS, NICEIC, CIGA or Stroma can self-certify their work and will not need building regulations approval from the council¹⁶. For windows and doors, Welsh guidance describes the registered installer route for glazing work⁸, covered in practice by schemes such as FENSA and Certass.

For heating, a solid fuel fired boiler or an oil fired boiler installer should be registered with the Competent Person Schemes¹⁷, and on completion the installer produces a commissioning certificate such as a Benchmark certificate and notifies the local authority building control department either directly or, if a scheme member, via the scheme operator¹⁸. For renewables, the pattern repeats: installers who are members of a relevant competent person scheme can self-certify certain types of building work, including the installation of solar PV, avoiding the need for separate building regulations approval¹⁴. Wind turbines follow Schedule 3 of the Building Regulations: for turbines attached to the house, an installer registered with the relevant scheme under Row 17 may self-certify without involving local authority building control, and for turbines not attached to the house, the same applies where the electrical work falls under Row 12¹⁹.

Schemes have different application processes and different fees for installers, and installers are told to choose a scheme that supports their trade or types of work⁴. For the householder, the trade-specific detail on individual schemes is covered in our pages on NICEIC registered electricians, NAPIT registered installers, FENSA and Certass window installers and MCS certified installers.

Assessment and inspection of installers

Registration is not a one-off badge. Before an installer is approved, their work is assessed to check they meet the level of competence required⁴. After approval, the oversight continues: ongoing inspections of approved installers take place yearly for the first 2 years, and there will then be ongoing inspections⁴.

For a householder, this is the substance behind the word "competent". The installer who self-certifies your job has had their work examined before joining and is re-examined on a cycle afterwards, by a scheme authorised by government to operate in that trade⁷. That is what distinguishes a self-certified job from an unchecked one: not the installer's own opinion on the day, but a regime of assessment and periodic inspection standing behind the certificate you are handed.

It also explains why the two routes differ in cost and friction. The building control route buys you an inspection of your specific job. The scheme route buys you an inspectorate that has already vetted the firm and continues to sample its work, funded through the scheme's fees rather than a per-job application⁴. Neither route guarantees a faultless installation, and scheme membership is voluntary, so a competent firm may legitimately operate outside the system, but only the scheme route produces a compliance certificate without a building control application.

Certificates, deadlines and proof of compliance

The paperwork is the point of the exercise, so it is worth knowing exactly what should arrive and when.

• A building regulations compliance certificate. When work is complete you receive a certificate showing the work was done by a registered installer, which can be used as evidence of compliance¹. Welsh guidance describes the same duty: the installer should both notify the local authority of the work and issue you a certificate of compliance with Building Regulations, either directly or through their scheme operator²⁰.
• The deadline. GOV.UK states the installer gives you a certificate within 8 weeks of completion¹. More tightly, for electrical work the competent person must send a self-certification certificate to the local authority within 30 days of the electrical works' completion⁵, and Welsh guidance likewise gives within 30 days of completion of the work for the building regulations compliance certificate⁹. Approved Document L sets the same thirty-day deadline for a notice of completion of commissioning where the work is carried out by a person registered with a competent person scheme²¹, and the Welsh approved documents repeat the thirty-day rule for the certificate provided to the occupier²².
• Electrical certificates. The client must receive both a copy of the self-certification certificate and a BS7671 Electrical Installation Test Certificate⁵, and the competent person should provide a completed Electrical Installation Certificate showing the work was tested for safety⁹.
• Heating certificates. For boiler work, the installer should produce a commissioning certificate such as a Benchmark certificate, with the local authority then supplying a building regulations completion certificate¹⁸.

If nothing arrives, do not let it drift. If you do not receive a certificate within 30 days of completion, contact the competent person scheme operator your installer is registered with²⁴. The certificate matters beyond tidiness: building control bodies may accept certification under such schemes as evidence of compliance with a relevant standard²⁵, and it is the document a buyer's solicitor will ask for years later.

When the work needs no notification

Not every job needs a certificate, and the boundaries are drawn by the regulations rather than by the installer's preference.

For electrical work, the exceptions are set out in Welsh guidance covering England and Wales: you do not need to tell the local authority about repairs, replacements and maintenance work, or extra power points or lighting points or other alterations to existing circuits, except in a kitchen or bathroom, or outdoors⁹. Those locations carry higher risk, so the same minor work becomes notifiable there.

For energy work generally, Approved Document L provides that a building control body does not need to be notified for certain services or fittings if the owner employs an installer registered with a relevant competent person scheme designated in the regulations, covering certain types of services and fittings including fuel burning appliances and replacement windows²¹. A dormer roof insulation refurbishment is a good illustration of how the routes interact: if the work is completed by a member of a competent persons scheme, an application for approval will not be required²⁶. Electric vehicle charging points sit on the other side of the line: notifiable work must be reported to the local building control body unless completed by someone registered on the competent person scheme who can provide a compliance certificate²⁷.

Two further boundaries are worth knowing. In Scotland, the provision of services, fittings and equipment to, or the demolition of, exempted services, fittings and equipment is exempt under regulation 3²⁸. And under the Feed-in Tariffs scheme rules, you may repair or replace all or some generating equipment without affecting the compliance of an accredited installation, provided the installation continues to meet the scheme rules²⁹. In short: repairs and replacements are generally outside the system, new notifiable installations are inside it, and a registered installer is the difference between a certificate and an application.

Rules in Scotland, Wales and Northern Ireland

The competent person scheme system described above is an England and Wales framework, and the nations differ in ways that matter when you hire.

Wales runs the same scheme structure. Welsh guidance on electrical work follows the England and Wales rules for dwellings⁹, Welsh guidance on doors and windows describes the registered installer route⁸, and Welsh guidance on boilers and heating sets out the same registration and notification expectations, including the thirty-day certificate deadline in the Welsh approved documents¹⁷. A 2025 consultation on Approved Document L in Wales continues to treat certification under independent schemes as evidence building control bodies may accept²⁵.

Scotland has no equivalent self-certification route for the same range of work. The Scottish system is built on building warrants: the building regulations always apply where construction occurs, unless exempted by regulation 3, and construction includes alterations and extensions as well as entirely new buildings³⁰. Changes of occupation or use listed in schedule 2 are defined as conversions, for which the owner must obtain a warrant, and the warrant will only be granted if the standards in regulation 12 are achieved, with matters such as thermal insulation having to be improved even where meeting the full standard is not practically achievable³⁰. Competence is still expected, but expressed differently: plumbing and associated water installations should be carried out and commissioned by persons who possess sufficient technical knowledge, relevant practical skills and experience³¹.

Northern Ireland differs again. Guidance on solid fuel stoves states that although qualifications are not mandatory, any person fitting a solid fuel stove must be competent to do so and should be familiar with the correct procedures and associated regulatory requirements³². The emphasis is on competence itself rather than a self-certification scheme of the England and Wales type.

The practical consequence: a household in Cardiff hires under the same scheme logic as one in Carlisle, but a household in Edinburgh or Belfast is dealing with warrants and competence requirements rather than scheme certificates. Our nation pages cover installers in Scotland, installers in Wales and installers in Northern Ireland in detail.

What membership means for your home

For a householder, scheme membership is best understood as a bundle of protections and obligations that travel with the job.

Compliance without an application. The work is certified as compliant, the local authority is notified, and you receive a certificate usable as evidence, all without a building control fee or inspection¹.

Redress if something is wrong. Competent person schemes have insurance-backed warranties and complaints procedures if there is a problem with the work¹. Where the installation company has gone out of business, you are given financial protection to cover the event of non-conpliant work being found²⁴. That protection is one of the few things that outlives the firm that did the job, and it is explored in our page on insurance-backed guarantees.

A record that follows the house. The certificate will show up in solicitors' searches if you come to sell your home¹. That cuts both ways: certified work smooths a sale, and uncertified notifiable work complicates one.

A limit on what membership proves. Membership is voluntary, and schemes cover only the trades they are authorised for⁴. Registration as a competent person is not the same as registration with a consumer code, a certification body such as MCS, or gas safety registration; those are separate systems with separate purposes, covered in our pillar page on home energy installers and retailers.

Residual responsibility. Even with a registered installer, the owner is the person on whom an enforcement notice may ultimately be served if the work does not comply⁶. The scheme route manages that risk; it does not delete it.

In energy independence terms, the schemes are the compliance layer of almost every measure a household uses to reduce dependence on energy suppliers and the grid: solar, batteries, heat pumps, ventilation, chargepoints. Each installation is a piece of infrastructure whose legality and resale value rest on a certificate, and the competent person scheme is the mechanism that produces it. The household's remaining dependence is on the installer's competence, the scheme's inspection regime and the operator's continued existence, which is why the certificates, the scheme name and the complaint route belong in the same folder as the warranty documents.