How to check installer credentials
Most UK energy grants require work to be carried out by an accredited installer. Verifying credentials before sharing details or signing anything reduces the risk of poor work or scams.
Common UK accreditations
- MCS for renewable heat and electricity (heat pumps, solar PV)
- TrustMark for retrofit work under government-backed schemes
- PAS 2030 / PAS 2035 standards for retrofit
- Gas Safe Register for gas work
- OFTEC for oil heating
What to ask for
- Company name, address and registration number
- Specific accreditation references and expiry dates
- Examples of similar past work in your area
- A written quote with measure, scheme route and any householder contribution
Red flags
- High-pressure cold calls promising "free" work without checks
- No written quote or unclear scheme route
- Refusal to provide accreditation references
- Requests for upfront payment before any survey
Where to verify
Each accreditation body has a public register. You can search by company or installer name. If you cannot verify an installer, do not share personal details.
Frequently asked questions
Why are accreditations important?
Most grant-funded measures must be installed by accredited firms. Without the right accreditation, work may not qualify for funding or warranty cover.
Is MCS the same as TrustMark?
No. MCS covers low-carbon heat and electricity products and installers. TrustMark is a wider quality scheme used for retrofit work under government-backed routes.
Can I check accreditation online?
Yes. MCS, TrustMark, Gas Safe and OFTEC each have public registers searchable by company or registration number.
What if a quote seems very low?
Compare the scope carefully. Very low quotes can omit ventilation, scaffolding, electrical upgrades or warranties needed for the measure.
Check what you may qualify for
Use the free energy grant checker to see possible support routes worth checking for your home.
Start grant check