Using an Installer in England: Registration, Notification and Redress

Finding an installer in England starts with a single question: is the person doing the work registered to certify it themselves, or will the work have to go through building control? An installer registered with a competent person scheme can self-certify that their work complies with building standards, and a building control body does not need to be notified for certain services or fittings where the owner employs such an installer¹. Where the installer is not registered, the firm or the householder must give notice to the local authority of the intention to carry out the work in advance, and pay a notification fee³.

That split shapes everything else: the paperwork a household receives, the cost of compliance, and who is accountable if the work is wrong. Membership of a competent person scheme is voluntary, so registration is a choice an installer makes, not a licence the state imposes⁴. Checking it is therefore part of hiring, not an afterthought.

For grant-funded work the constraint is tighter still. The Boiler Upgrade Scheme provides upfront capital grants of up to £7,500 towards replacing fossil fuel heating, is installer-led, and requires the chosen installer to be certified by the Microgeneration Certification Scheme⁵. A household cannot apply for that grant itself, and cannot ask Ofgem to review a decision about it; only installers can⁶.

Finding an installer in England: where to start

The practical starting points are the registers themselves. For electrical work, the registered electrician directory at electricalcompetentperson.co.uk is the route the electrical safety bodies point households to⁸. For heat pumps, solar and other microgeneration, the government-endorsed Microgeneration Certification Scheme holds a find-an-installer directory, and official guidance suggests getting at least three quotes from reputable installers⁹. For general building work, ministers advise using builders registered with TrustMark, described as a trusted scheme that helps ensure work is done properly¹⁰.

These registers do different jobs and are not interchangeable. A competent person register exists so that an installer can self-certify their own work under the building regulations; MCS certification is what makes an installation eligible for certain grants and standards; TrustMark is a government endorsed quality scheme that operates as a competent person register for finding an installer who will assess the circumstances and property to identify suitable measures¹¹.

The other constraint is the grant scheme attached to the work. Where a household wants Boiler Upgrade Scheme funding, the installer must be MCS certified, so the shortlist narrows before any quote is sought⁵. Where the work is funded through a local authority or energy company obligation route, the installer requirements come from that scheme's rules rather than from the building regulations. The installer requirements for grants and funded schemes page sets out how those conditions differ, and checking an installer before you sign covers the verification steps that apply to any of them.

Competent person schemes: registration that covers notification

A competent person scheme is the mechanism that lets an installer certify their own work instead of involving local authority building control. An installer registered with a scheme can self-certify that their work complies with building standards, and a registered installer is approved to carry out the work to comply with building regulations without involving local authority building control¹. For the householder, that means no separate building control application, no inspection visit and no notification fee.

Membership is voluntary, and there are ongoing inspections of approved installers once they are in a scheme⁴. The schemes are designated in the regulations for particular types of work, and the exemption from notification applies to certain services or fittings, including fuel-burning appliances and replacement windows, where the owner employs an installer registered with a relevant scheme².

For heating work specifically, official guidance in Wales states that oil fired boiler and solid fuel fired boiler installations should use an installer registered with the Competent Person Schemes³. The same logic applies to the trades that carry their own schemes: gas work through Gas Safe registration, oil and renewable heating through OFTEC, solid fuel and biomass through HETAS, windows and doors through FENSA or Certass, and electrical work through the Part P schemes. The competent person schemes page explains which scheme covers which trade, and the individual registration pages for Gas Safe, OFTEC, HETAS and FENSA and Certass set out what each one verifies.

The certificate matters as much as the registration. When work is complete under a scheme, the household receives a certificate showing the work was done by a registered installer¹³. That certificate is the evidence that building regulations compliance has been dealt with, and it is the document a future buyer, solicitor or grant auditor will ask for. Where a scheme covers electrical work, a copy of the Installer's Electrical Installation Test Certificate compliant with BS7671 must be obtained and supplied to the local authority¹⁴.

TrustMark: the government-endorsed quality mark

TrustMark is a government endorsed quality scheme, and it operates as a competent person register for finding an installer who will assess the circumstances and property to identify suitable measures¹¹. Its reach extends beyond voluntary good practice into legislation: the Warm Home Discount (England and Wales) Regulations 2026 require that a boiler or central heating system be installed by, or under the responsibility of, a person registered with TrustMark, with a certificate of lodgement issued by the operator of TrustMark¹⁵.

The same condition appears in scheme delivery guidance. Measures covered by PAS and projects containing such measures, including MCS work, should be installed by or under the responsibility of a TrustMark registered installer and have a relevant certificate of lodgement¹⁶. In practice this means that for a defined set of funded measures, TrustMark registration is not optional decoration but a condition of the funding.

For a household, the value of TrustMark is threefold. It gives a register to search before hiring, it produces a certificate of lodgement that evidences the work, and it provides a dispute route if the work goes wrong. TrustMark takes homeowner support enquiries through an online form, and disputes can be raised by email at disputes@trustmark.org.uk¹⁷. The TrustMark registered businesses page covers what registration actually requires of a business, and how to complain about a TrustMark registered business sets out the escalation path.

What must be notified to building control, and what is exempt

The notification rules turn on who is doing the work. Where a registered competent person carries out the work, a building control body does not need to be notified for certain services or fittings, including fuel-burning appliances or replacement windows². Where the installer is not a registered competent person, the position reverses: for heat pumps, the installer must notify an appropriate building control body before work begins¹⁸.

The same pattern applies across technologies:

Northern Ireland operates a separate system. There, building control should also be notified prior to the commencement of stove installation work to allow a timely inspection to be arranged²¹. The installers in Northern Ireland page covers that regime, and installers in Scotland and installers in Wales cover the building warrant and Welsh arrangements respectively.

Part P: the rules for electrical work in a dwelling

Part P of the Building Regulations applies to all new electrical work in a dwelling, which must be designed and installed to account for it²². Dwellings include a house, a flat or a small commercial premises linked to domestic accommodation²². The Building Regulations set standards for electrical installation work in relation to dwellings, but they do not set standards for the safety of electrical appliances; they do require that fixed connections of appliances are safe²³.

The recommended route is to hire an installer registered with a competent person scheme, a registered competent person, who can self-certify that the work meets the required standards²². Where the electrician is not registered as a competent person, or where the work is done by the householder, a Building Regulations application should be made to Building Control²³. Approval can be sought from the relevant Building Control Body, either at the local authority or an Approved Inspector, who check compliance and, if satisfied, issue a certificate of compliance¹².

Not all electrical work is notifiable. The Building Regulations allow certain works, known as non-notifiable or minor work, to be carried out without notifying building control or using a registered electrician²³. Repairs, replacements and maintenance work, and extra power points or lighting points or other alterations to existing circuits, do not need to be reported, except in a kitchen or bathroom, or outdoors²³. Adding lighting points, including light fittings and switches, to an existing circuit is non-notifiable where the work is not in a kitchen or special location and does not involve a special installation²².

The NICEIC registered electricians and NAPIT registered installers pages cover the two largest electrical registration bodies, and who can self-certify electrical work explains the boundary between notifiable and non-notifiable work in more detail.

Building regulations: the cost of non-compliance

The consequences of non-compliance fall on the household as well as the installer. Where building regulations are not followed, the work may have to be corrected or a fine paid¹. For renewable installations, if the installer does not adhere to building regulations the local authority may serve an enforcement notice²⁴.

The practical costs are wider than the fine. Uncertified work can surface at the point of sale, when a solicitor asks for building regulations completion evidence and none exists. It can also invalidate a grant claim: Boiler Upgrade Scheme audits may request a building completion certificate among the evidence for eligible self-build properties²⁵. And it can complicate insurance, because an insurer assessing a claim for water damage or fire will want to know the installation was certified.

The remedy is usually retrospective but not free. Where work was carried out by an unregistered installer or by the householder, a Building Regulations application can still be made to the local authority or an Approved Inspector, who will check compliance and issue a certificate if satisfied¹². That route carries an application fee and may require opening up finished work for inspection. The building regulations compliance certificate page explains what the certificate records and why it is asked for.

MCS certification: when your installer must hold it

MCS certification is required wherever a household wants to use the Boiler Upgrade Scheme. The chosen installer must be certified by the Microgeneration Certification Scheme, a nationally recognised certification scheme, for the installation to qualify⁵. Official guidance directs households to use the government-endorsed MCS directory to find certified installers⁹.

MCS certification is not a general competence licence. It certifies particular technologies to particular standards, which is why the MCS certified installers page and the MCS installation standards page matter: the certificate a household receives at the end of the job depends on the standard the installer was working to. The MCS certificate and handover documents page sets out what should be handed over.

Where a complaint about an MCS installer is not resolved, the householder can approach the MCS Administrator, who will advise how to make a complaint about the MCS installer²⁶. That is a separate route from the consumer codes. The Renewable Energy Consumer Code and the HIES consumer code cover the conduct and deposit protection side of renewable installations, and MCS umbrella schemes explains what it means when an installation is carried out under another company's certification.

Grants applied through the installer: how the Boiler Upgrade Scheme works

The Boiler Upgrade Scheme is the clearest example in England of a grant that constrains installer choice. It provides upfront capital grants of up to £7,500 to encourage property owners to replace existing fossil fuel heating with low carbon systems such as heat pumps⁵. It opened on 23 May 2022 and closes on 30 December 2029⁵. It covers England and Wales⁵.

The application is installer-led, with the installer applying for the grant on the property owner's behalf⁵. The installer discounts the grant from the invoice, applies to Ofgem, the scheme administrator, for a grant voucher, and redeems the voucher after installation and commissioning⁵. The grant application is a two-stage process: the installer submits a voucher application, Ofgem issues a voucher, the installer submits a voucher redemption application, and the installer receives the grant payment²⁸.

Several conditions sit alongside the installer requirement. The property must have a valid energy performance certificate⁵. One grant is available per property, and no grant is available for hybrid heat pump systems, such as a combination of gas boiler and air source heat pump²⁹. Unspent budget is not carried over to the next scheme year²⁸. Where a household disagrees with an administrative decision, complaints about Ofgem's administration of the scheme go to feedback@ofgem.gov.uk, and general enquiries go to BUS.Enquiry@ofgem.gov.uk⁶.

The published grant figure is not consistent across documents. The scheme rules state grants of up to £7,500, while other official guidance gives £5,000⁵.

If something goes wrong: redress and Trading Standards

Redress in England runs along several tracks, and which one applies depends on the registration the installer holds. Where the installer is a member of a competent person scheme, the scheme itself is the first point of complaint, because the scheme is what allowed the work to be self-certified. Where the installer is MCS certified, the MCS Administrator can advise on making a complaint if the installer does not resolve it²⁶. Where the installer is TrustMark registered, disputes go to disputes@trustmark.org.uk or through the online support form¹⁷.

For grant-funded work, the routes narrow. Only installers can ask Ofgem to review a Boiler Upgrade Scheme decision, so a householder who disagrees with an outcome has to work through the installer⁶. Complaints about the administration of the scheme itself go to Ofgem at feedback@ofgem.gov.uk⁶. The complaining about an installer page maps the full escalation sequence, and when an installer goes bust covers what happens when the company itself fails.

Trading Standards sits behind the voluntary codes rather than in front of them. It deals with breaches of consumer protection law, including mis-selling and false claims about registration, rather than with workmanship disputes, which are civil matters between the householder and the trader. The mis-selling and doorstep sales page covers the conduct issues that fall to Trading Standards, and consumer rights for installation work covers the statutory remedies for faulty work.

Northern Ireland has a distinct enforcement mechanism. Under Article 27, a distributor may issue a notice in writing requiring remedial works where it is not satisfied that a connected or proposed connection is constructed, installed, protected, used or arranged for use to prevent, so far as is reasonably practicable, danger or interference³⁰. That applies to a consumer's installation, another distributor's network or a street electrical fixture³⁰.

What this means for a household's energy independence

Registration and notification are not paperwork for its own sake. They determine whether an installation is legally complete, whether it can be funded, and whether there is anyone to complain to when it fails. A household that uses a registered competent person gets self-certification, a compliance certificate and a scheme complaint route. A household that does not gets a notification fee, a building control application and, if the work is wrong, a civil claim against a trader with no scheme behind it.

The dependence that remains is structural. The Boiler Upgrade Scheme is installer-led, so the grant, the voucher and any review request all pass through a company the household does not control⁵. MCS certification is a condition of funding, so the choice of installer is constrained by a certification the household cannot grant⁵. TrustMark registration is a condition of certain funded measures, so the register is not merely advisory¹⁵. And the building regulations themselves are enforced by local authorities, not by the household.

What a household can control is verification before signing. Checking registration against the relevant scheme, confirming the certificate that will be issued at the end, and keeping the documentation that an audit may later request are the steps that keep an installation inside the system rather than outside it. The home energy installers and retailers guide covers the full sequence from shortlisting to complaint.