Glossary · Regulations and registration

Key points

  • TrustMark is a not-for-profit scheme operating under a licence from the Department for Business and Trade.
  • It works through scheme providers, which register and monitor the tradespeople. It does not register them directly.
  • Registered businesses are expected to provide a minimum two-year guarantee, and financial protection if they cease trading.
  • Complaints go to the business first, then to its scheme provider, then to the Dispute Resolution Ombudsman.
  • TrustMark is separate from Part P self-certification. The Building Regulations certificate comes from a competent person scheme.

How TrustMark works

TrustMark describes itself as the only UK Government-Endorsed Quality Scheme for work carried out in and around the home. It started in 2005, is a not-for-profit organisation and operates under a Master Licence Agreement issued by the Department for Business and Trade.[1]TrustMark, Who is TrustMark?

It works through scheme providers. It licenses and audits more than 40 scheme providers, which are accreditation bodies and trade associations. Those providers have around 18,000 registered businesses across 115 service types, from electricians and plumbers to carpet cleaners. The providers in turn license their registered businesses and make sure they keep to standards of technical competence, trading practices and customer service.[1]TrustMark, Who is TrustMark? Complaints guidance adds that scheme providers can be trade associations, certification bodies or competent person schemes.[3]TrustMark, Complaints Process NAPIT, for example, says it became a TrustMark scheme operator in 2006.[5]NAPIT, About us

What protection it offers

Protection What TrustMark says
Vetting Registered businesses are vetted and monitored by scheme providers for technical competence, customer service and trading practices
Guarantee Registered businesses are expected to provide a minimum two-year guarantee
Financial protection Varies between businesses, but at a minimum covers 2-year post-completion workmanship, rectification of defects or major damage, and non-compliance with Building Regulations
Disputes A three-stage complaints process, ending with the Dispute Resolution Ombudsman

The vetting, the guarantee and the financial protection are all described on TrustMark’s consumer protection page.[2]TrustMark, Consumer Protection Its homeowner guidance says registered businesses are vetted and monitored, and that homeowners can use a dispute resolution process if something goes wrong.[4]TrustMark, Information and Guidance for Homeowners It also advises you to ask the business about the guarantee before contracting for work.[2]TrustMark, Consumer Protection

The complaints process

TrustMark sets out three stages that must be followed in order. First, raise the complaint with the registered business and give it a reasonable time to put things right. Second, escalate to the business’s scheme provider, which should investigate and mediate. Third, if it is still unresolved, you can take it to the Dispute Resolution Ombudsman, provided the earlier stages are complete and you do so within 12 months of the initial complaint.[3]TrustMark, Complaints Process

TrustMark cannot help if the business no longer holds a registration or has ceased trading, if it was not registered when it did the work, if the work was completed more than 6 years ago, if the complaint is a financial or contractual matter, or if legal action has begun.[3]TrustMark, Complaints Process

Example

Chloe has a job done in her house in Garforth by a business that displays the TrustMark logo. A fault appears two months after the work. She writes to the business first, as stage one asks, and gives it time to respond. When there is no reply she looks the firm up on TrustMark’s Find a Business page, which shows its scheme provider, and escalates to that provider at stage two.[3]TrustMark, Complaints Process She does this before the 12 month window to reach the ombudsman closes.[3]TrustMark, Complaints Process

What people get wrong

Many people treat the TrustMark logo as proof in itself. A logo is a claim, not a check. TrustMark’s own homeowner page says consumers now check with schemes that a business has the right to use an accreditation, and its Find a Business page shows which scheme provider a firm is registered with.

TrustMark is also not the same as Part P. The Building Regulations compliance certificate for notifiable electrical work comes from an installer registered with an authorised competent person scheme, not from TrustMark.[6]Ministry of Housing, Communities and Local Government, Electrical safety: Approved Document P (2013 edition) Our page on the Building Regulations compliance certificate explains the difference, and NICEIC vs NAPIT covers two of the schemes.

The bottom line

TrustMark is a government-endorsed quality scheme that works through scheme providers. It offers vetting, an expected two-year guarantee, financial protection and a three-stage complaints route. It does not replace the certificates electrical work needs, and it can only help with businesses that were registered when the work was done. Check the register for any firm that shows the logo, and ask about the guarantee before you sign.

Common questions

Is TrustMark a government scheme?

TrustMark describes itself as the Government Endorsed Quality Scheme for work in and around the home. It is a not-for-profit company operating under a licence agreement issued by the Department for Business and Trade.

Does TrustMark replace NICEIC or NAPIT?

No. TrustMark works through scheme providers, which can be trade associations, certification bodies or competent person schemes. NAPIT says it has been a TrustMark scheme operator since 2006.

What can TrustMark not help with?

It cannot help if the business was not registered when it did the work, if the work was over 6 years ago, or if the complaint is a financial or contractual matter between you and the business.

What guarantee does a TrustMark business give?

Registered businesses are expected to provide a minimum two-year guarantee. TrustMark says financial protection varies between businesses but must at least cover two years of workmanship, defects and Building Regulations non-compliance.

Sources

We cite the original source for every fact: legislation, GOV.UK, HSE, the IET, registration bodies and manufacturers' own documents. Each one shows the date we last checked it.

  1. TrustMark. Who is TrustMark?. Checked 11 November 2026. ↩
  2. TrustMark. Consumer Protection. Checked 11 November 2026. ↩
  3. TrustMark. Complaints Process. Checked 11 November 2026. ↩
  4. TrustMark. Information and Guidance for Homeowners. Checked 11 November 2026. ↩
  5. NAPIT. About us. Checked 11 November 2026. ↩
  6. Ministry of Housing, Communities and Local Government. Electrical safety: Approved Document P (2013 edition). Checked 11 November 2026. ↩

Where this matters

NICEIC and Part P qualifications explained

Related terms