How to Choose a Renewable Energy Installer: MCS, TrustMark and RECC

Choose a renewable energy installer by checking three things: the business you will contract with, its credentials for the work you need, and the detail of its proposal. MCS, TrustMark and RECC have different roles. A current register entry is useful evidence, but you also need to understand what you are buying and who will support it afterwards.

These checks apply whether you are considering a heat pump, solar panels, battery storage or a combination. You do not need to become a technical expert. You need enough clear information to compare the choices and ask for an explanation when they differ.

MCS explains its standards and certification role in its published introduction to the scheme. TrustMark’s homeowner guidance describes its checks on technical competence, customer service and trading practices. RECC’s overview explains the customer-service standards its members agree to follow.

Treat these as separate checks. Do not assume that one logo establishes every other registration, covers every service the business advertises, or guarantees a particular saving. If a grant, finance offer or export arrangement forms part of your plan, ask which requirements apply to that specific route.

Start with the legal business name, trading name and contact details on the proposed contract. Match those details to the credentials being presented. A familiar brand name on a van or sales brochure is not enough to tell you which company will take responsibility for your installation.

1. Ask for the MCS certification number and use the official MCS installer search to check the relevant technology. If details are missing or do not match, clarify them with the business and the scheme.

2. If TrustMark registration is claimed, use TrustMark’s business search and check the entry for the work you need.

3. If RECC membership is claimed, check the current RECC member directory. It lists the businesses that are members, rather than everyone who may display a logo.

4. Keep the quotation and the register details together. Recheck a claim if the contracting company changes before you sign.

Ask who will survey, design, install and commission the system. If other businesses will be involved, establish who coordinates them and handles a fault between their areas of work. For RECC members, the current Code requires subcontracted work to be explained and keeps responsibility with the contracting member.

References are useful when they answer a practical question. With the previous customer’s permission, ask about communication, disruption, the handover and support after completion. A similar property or installation is more informative than a large collection of unrelated photographs.

Write a short brief before requesting quotations. Include what you want to improve, your current heating system, energy-use information, any known building problems and work already planned. Explain your budget and timing, including an urgent heating failure or a renovation deadline.

State which decisions are still open. For example, you may want solar panels now but need the case for a battery explained separately. Or you may be considering a heat pump alongside future insulation work. Each installer should be responding to the same home and intentions, rather than filling gaps with different assumptions.

Ask for comparable written proposals; RECC recommends obtaining at least three quotations. An initial estimate before a survey and a detailed quotation after assessment are different stages. Mark unresolved survey items so an attractive early figure does not become your only point of comparison.

Use a simple comparison sheet with one column for each installer. The questions below help identify whether you are comparing equivalent work. MCS’s quotation guidance calls for clear business information, equipment, costs, timings, payments and protection details.

For example, one heat-pump quotation may include radiator changes and electrical work while another leaves them to you. The headline prices will not explain that difference. Ask both businesses to set out the full proposed job before deciding which offers better value.

Then ask the questions that matter for your system:

• Heat pump: what does the design assume about heat loss, radiators or underfloor heating, hot-water demand and future building work? Ask how the proposed equipment position and controls will work in daily life.

• Solar panels: what roof layout and shading assumptions support the generation estimate? Establish whether any planned roof work should happen first and what household electricity use is assumed.

• Battery storage: why this usable capacity and power output? Ask what the system will do on the proposed tariff and precisely what would remain powered during a cut if backup is included.

Request the assumptions behind any bill or payback projection. Compare the same energy prices, household use and included costs wherever possible. An estimate based on your information is more useful than a promising headline without its workings. EPC’s heat-pump installation guide and battery selection guide provide further questions to take into the discussion.

Keep three questions separate: what happens if equipment develops a fault, what happens if the installation work is defective, and what happens if the installer stops trading. An equipment warranty, workmanship guarantee and financial protection policy can address different situations.

RECC requires its members to protect deposits, further advance payments and workmanship warranties against the installer ceasing to trade. Its protection guidance explains why you need to identify the actual provider and policy. RECC itself is not an insurer; membership alone does not establish that your installation has been registered for insurance.

Ask for the provider’s name, the protection document and any registration you must complete. Read the duration, exclusions, claim process and any conditions attached to servicing. Check whether labour, access or replacement-related costs are covered rather than assuming every cost follows the equipment warranty.

An installation is easier to live with when the handover has been planned. Ask which records apply to your project and who supplies them. These may include commissioning results, electrical or building-control documents, an MCS installation certificate where applicable, operating instructions and warranty records.

Request a demonstration of everyday controls and access to any monitoring account. Establish how to recognise normal operation, how to report a problem and who provides ongoing servicing. If a service plan is offered, compare its scope and charges separately from the installation price.

Keep a named complaints contact and the escalation procedure with your contract. MCS’s complaints policy distinguishes the circumstances in which it can help and the routes under its original and redeveloped schemes. Ask which route applies to your installation; do not assume every complaint or insurance claim goes through the same organisation.

A good proposal should become easier to understand as your questions are answered. Pause if important details remain verbal, the business name does not match its claimed credentials, or a savings promise cannot be explained. Pressure to decide immediately also deserves attention: the RECC Code prohibits members from using high-pressure selling techniques.

• I know which business holds my contract and who will carry out the work.

• I have checked the credentials relevant to my proposed installation.

• I understand the design, full cost, exclusions and remaining survey assumptions.

• I have the payment, cancellation and change-of-work terms in writing.

• I understand the warranties, financial protection and registration requirements.

• I know what happens at handover and where to go for aftercare.

You do not need every proposal to be identical. You need to understand why they differ and decide which one fits your priorities. Keep the written explanation with the quotation so that the decision remains clear when installation day arrives.