TrustMark, MCS and PAS 2030: How to Find an Approved Installer

Finding a TrustMark approved installer is the single most important step when planning any energy efficiency improvement to your home. Whether you are installing insulation, a heat pump, solar panels, or a new boiler, using a properly accredited contractor protects your investment, ensures quality workmanship, and is essential for accessing government grants. This guide explains the three key accreditations, TrustMark, MCS, and PAS 2030, what each one covers, and how to search the official registers to find verified installers near you.

How to Find an Approved Installer for Energy Efficiency Work

To find a certified installer for government-funded energy efficiency work in the UK, check that they hold the correct accreditation: TrustMark registration for general retrofit work, MCS certification for renewable energy installations like solar panels and heat pumps, and PAS 2030 compliance for the installation of specific energy-saving measures under ECO4 and other grant schemes.

You can search for TrustMark-registered businesses at trustmark.org.uk and MCS-certified installers at mcscertified.com. Always verify certification before signing any contract, and be wary of cold callers claiming to offer free government grants — legitimate installers will never ask for upfront payments for ECO4 or GBIS-funded work.

Why Installer Accreditation Matters

Choosing an unaccredited installer might save money upfront, but it exposes you to significant risks.

• Grant ineligibility: ECO4, the Warm Homes Local Grant, the Boiler Upgrade Scheme, and virtually all other government funding schemes require work to be done by accredited installers. Using a non-accredited installer means forfeiting thousands of pounds in grants
• No warranty protection: TrustMark-registered work comes with financial protection through the TrustMark Framework Operating Requirements, including deposit protection and complaint resolution
• Building Regulations compliance: Accredited installers can self-certify Building Regulations compliance through Competent Person Schemes, saving you time and the cost of separate Building Control inspections
• Quality assurance: Accredited installers undergo regular audits, maintain professional insurance, and follow documented installation standards
• Redress: If something goes wrong, the accreditation bodies provide formal dispute resolution and, in some cases, financial compensation

TrustMark: The Government-Endorsed Quality Scheme

TrustMark is the government-endorsed quality scheme for work carried out in and around the home. It covers a wide range of trades, from general building work to specialist energy efficiency installations.

What TrustMark Covers

• Insulation installation (loft, cavity wall, external wall, internal wall, floor)
• Boiler installation and heating system upgrades
• Window and door replacement
• Draught-proofing
• Ventilation improvements
• General building work related to energy efficiency

How TrustMark Registration Works

Businesses apply to TrustMark through a registered scheme provider (such as NAPIT, NICEIC, or CERTASS). To gain and maintain registration, they must meet the following requirements.

• Hold appropriate trade qualifications
• Maintain valid public liability insurance (minimum 2 million)
• Submit to regular on-site audits and inspections
• Meet the TrustMark Framework Operating Requirements
• Provide customer guarantees and participate in dispute resolution
• Comply with all relevant Building Regulations and industry standards

How to Search the TrustMark Register

Visit the TrustMark website and use their “Find a Business” tool. Enter your postcode and select the type of work you need. The results show all registered businesses in your area, along with their scheme provider, trade categories, and customer reviews. You can also verify a specific business by searching their name or registration number.

MCS: The Microgeneration Certification Scheme

MCS (formerly the Microgeneration Certification Scheme) is the quality assurance standard specifically for renewable energy installations. If you are installing a heat pump, solar panels, or other renewable technology, MCS certification is essential.

What MCS Covers

• Air source heat pumps
• Ground source heat pumps
• Solar PV panels
• Solar thermal systems
• Wind turbines (domestic scale)
• Battery storage (when installed alongside solar PV)

Why MCS Certification Is Essential

MCS certification is mandatory for the following.

• Boiler Upgrade Scheme: The 7,500 heat pump grant can only be claimed through an MCS-certified installer
• Smart Export Guarantee: To receive payments for exporting surplus solar electricity to the grid, the installation must be MCS-certified
• Home Energy Scotland grant: Heat pump and solar grants in Scotland require MCS certification
• Feed-in Tariff legacy: Existing FIT installations required MCS certification at the time of installation

Without MCS certification, you cannot access these financial incentives, which can represent thousands of pounds in lost grants and ongoing payments.

How to Search the MCS Register

Visit the MCS website and use their installer search tool. Enter your postcode and select the technology type (solar PV, air source heat pump, etc.). The results show all MCS-certified installers in your area, their certification categories, and contact details. You can also verify a specific installer’s certification by searching their company name or MCS number.

PAS 2030: The Insulation Installation Standard

PAS 2030 is the specific quality standard for the installation of energy efficiency measures in existing buildings. It was developed by the British Standards Institution (BSI) and is the baseline standard for all government-funded insulation work.

What PAS 2030 Covers

• Cavity wall insulation
• External wall insulation
• Internal wall insulation
• Loft insulation
• Floor insulation
• Room-in-roof insulation
• Draught-proofing
• Heating system upgrades (when funded through government schemes)

PAS 2030 vs PAS 2035

PAS 2030 covers the installation process, while PAS 2035 covers the overall retrofit assessment and project management. Together, they form the quality framework for energy efficiency retrofitting.

• PAS 2035: Requires a qualified Retrofit Coordinator to oversee the project, carry out a whole-house assessment, and ensure measures are installed in the correct order and do not create unintended consequences (such as condensation or moisture problems)
• PAS 2030: Specifies the installation standards that the contractor must follow for each individual measure

For government-funded work through ECO4 or the Warm Homes Local Grant, both PAS 2030 and PAS 2035 compliance is mandatory. The Retrofit Coordinator is usually arranged by the funding body or the lead installer.

Comparing the Three Accreditations

Many installers hold multiple accreditations. A company installing heat pumps alongside insulation might hold TrustMark registration, MCS certification, and PAS 2030 accreditation simultaneously. When choosing an installer, check that they hold the specific accreditation relevant to your project.

How to Choose the Right Installer

Beyond checking accreditation, there are several other factors to consider when selecting an installer.

• Get multiple quotes: Obtain at least three quotes from different accredited installers to compare pricing, scope of work, and timelines
• Check reviews: Look at customer reviews on the TrustMark website, Google, and independent review platforms
• Ask about experience: How many similar installations has the company completed? Request references from previous customers
• Verify insurance: Confirm the installer has valid public liability insurance and professional indemnity cover
• Understand the warranty: What warranties are provided for materials and workmanship? How long do they last? Who backs them?
• Check the quote details: A good quote should specify the materials to be used, the expected U-values or performance standards, the timeline, and any additional costs

If you want to compare quotes from accredited installers for any energy efficiency improvement, request a free quote and we will connect you with verified professionals in your area.

Red Flags: Warning Signs of Unscrupulous Installers

The energy efficiency sector, like any home improvement industry, has its share of unreliable operators. Watch out for these warning signs.

• No verifiable accreditation: If an installer claims to be TrustMark registered or MCS certified but cannot provide a registration number that checks out on the official registers, walk away
• Pressure selling: Legitimate installers provide quotes and give you time to decide. High-pressure tactics (“this price is only available today”) are a red flag
• Large upfront deposits: While a small deposit may be reasonable, demands for 50%+ upfront before work begins are concerning. TrustMark-registered businesses must comply with deposit protection rules
• No written contract: All work should be covered by a written contract specifying the scope, timeline, cost, materials, and warranty terms
• Significantly cheaper than competitors: If one quote is dramatically lower than others, ask why. Cheap quotes often mean corners being cut on materials, insulation thickness, or post-installation documentation

Frequently Asked Questions

Can I use a non-accredited installer if I am paying privately?

Legally, yes. There is no law preventing you from using an unaccredited installer for privately funded work. However, you lose the consumer protections, warranty backing, grant eligibility, and Building Regulations self-certification that accredited installers provide. If you later want to access government grants, the work may need to be reassessed and potentially redone by an accredited installer.

How much more do accredited installers charge?

In practice, accredited installers are often no more expensive than unaccredited ones for the same scope of work. The accreditation overhead is minimal relative to the total project cost. Where price differences exist, they typically reflect better materials, more thorough installation practices, and proper documentation rather than just accreditation fees.

What if my installer loses their accreditation after completing the work?

If the installer was accredited at the time of installation, your warranty and any grant funding remain valid. TrustMark and MCS both have arrangements to ensure that consumer protections continue even if the installer subsequently loses their registration. For TrustMark-registered work, the guarantee is backed by an insurance-backed warranty that survives the installer’s business status.

Do I need different installers for different measures?

Not necessarily. Many larger installation companies hold accreditations for multiple measure types and can handle a whole-house retrofit as a single project. However, specialist measures like heat pump installation or solar panel fitting often benefit from a dedicated specialist. If you are having multiple measures installed, a Retrofit Coordinator (required under PAS 2035 for funded work) will oversee the entire project and coordinate between different trades.