How do I find an MCS installer?

MCS Certified online directory. Cross-check on TrustMark register for additional consumer protection.

5–15% premium typical. Often offset by BUS grant (£7,500) and SEG payments (£200–£500/year for typical PV).

Can a non-MCS installer subcontract to MCS for certification?

No — the installer signing the MCS certificate must be the certified body that performed the install.

Does Builderr use MCS installers?

Yes — our heat pump and solar partners are all MCS certified, lodged with TrustMark, and BUS-grant eligible.

Quick Answer

MCS installer vs non-MCS in London — does it matter?

MCS (Microgeneration Certification Scheme) installer status matters in London for: grants (BUS £7,500 requires MCS), warranties (most product warranties on heat pumps and solar require MCS install), Smart Export Guarantee tariffs (energy providers require MCS), and resale due diligence. Non-MCS installs save 5–15% upfront but lose grant eligibility and may invalidate warranties. For heat pumps and solar PV in London, MCS is effectively essential.

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What MCS covers

Heat pumps (air source, ground source). Solar PV. Solar thermal. Biomass boilers. Wind turbines. Battery storage (some schemes). Installers certified by MCS bodies meet competency, training and quality standards. Each install lodged on MCS database with certificate.

Why it matters

BUS grant: MCS install mandatory (£7,500 lost without). Smart Export Guarantee: MCS PV certificate required for export tariff payments. Product warranties: most manufacturers require MCS install for full warranty (typically 5–7 years on heat pumps). Resale: solicitors increasingly request MCS certificates as part of property due diligence.

When non-MCS is OK

Off-grid or non-grant-funded installs where homeowner accepts no SEG/BUS and accepts manufacturer warranty risk. Rare in mainstream London projects. Some commercial-scale installs use different certification (e.g. RICS or NICEIC for solar).

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