The Honest Answer: Are All MCS-Certified Renewable Energy Installers the Same?
No, and I say that as the Managing Director of a company that has held MCS certification since the scheme launched and has been installing renewable energy systems across Hampshire since 1988. The certificate tells you that a company met the minimum standard to be registered. It tells you nothing about the quality of their heat loss calculations, the correctness of their radiator specifications, or whether they will answer the phone when something goes wrong in year three.
Getting called out to fix other MCS-certified companies’ installations is a regular part of this work. Not comfortable saying publicly. But true, and homeowners deserve to know it.
At AES, we don’t just clear the hurdle of MCS certification; we set the benchmark for what a premium installation should actually be. We are proud to hold the certification, but we have always operated far beyond the minimum standards dictated by an official checklist. For us, certification is the baseline, not the finish line. We pride ourselves on the fact that our standards start where the regulations end. From our meticulous, room-by-room heat loss calculations to our uncompromising commissioning and thirty-five-plus years of Hampshire engineering heritage, we deliver the precision, performance, and lifelong support that a basic certificate simply cannot guarantee.
What does MCS certification actually mean?
MCS, the Microgeneration Certification Scheme, is the UK’s official quality standard for small-scale renewable and low-carbon energy installations. To become MCS-certified, an installer must demonstrate competence, carry appropriate insurance, follow MCS installation standards, and maintain ongoing compliance.
Certification is a genuine filter. It removes the least qualified operators from the market. Any installer who cannot meet MCS standards should not be touching a solar or heat pump installation in Hampshire.
But certification is a floor, not a ceiling. It establishes that a company can legally install. It does not guarantee that they do it well.
What does MCS certification not tell you?
It does not tell you whether the installer carries out a proper heat loss calculation before specifying a heat pump. It does not tell you whether they upgrade radiators to suit the lower flow temperature, or whether they install the correct cylinder, or whether they commission the system correctly.
It does not tell you whether they will answer the phone when something goes wrong three years after installation. It does not tell you whether they have over thirty-five years of Hampshire installation experience or six months.
At AES, we regularly get called out to heat pump and solar installations completed by other MCS-certified companies. The equipment is certified. The installation is not always up to the standard that should follow from it.
What should you look for beyond MCS certification?
Manufacturer approval. AES is a Mitsubishi approved partner. That is a separate accreditation that requires demonstrated competence working with specific equipment. Manufacturers do not award this without verification.
Years trading. AES has been installing across Hampshire since 1988. A company that has been trading for three years has not had enough installations reach maturity to know how their work performs over time.
References from completed jobs. Ask for specific references, not testimonials on a website. Speak to homeowners in Hampshire who had a heat pump or solar installation completed by the company two or more years ago. Ask whether the system performed as expected and how the company responded to any issues.
The survey process. Any competent heat pump installer will carry out a room-by-room heat loss calculation before quoting. If an installer quotes without one, walk away.
Transparency on cost. At AES, we charge the same price regardless of whether a BUS grant is available. The grant does not inflate our margins. Some companies use grant availability as an opportunity to increase pricing. Ask them directly.
Related reading:
- Is it safe to go with the cheapest quote for solar panels or a heat pump?
- Does it matter whether your solar or heat pump installer is MCS certified?
- My neighbour had a bad experience with a heat pump, are they really that unreliable?
MCS certification matters. But it is not sufficient on its own. Do your homework. Take references. Look at how long the company has been established. That is the advice I give to anyone who asks me where to start.
Contact us today to book your free survey.
FAQs
Is MCS certification required for the BUS grant?
Yes. The Boiler Upgrade Scheme requires that the installation is carried out by a current MCS-certified installer. AES is MCS-certified. An installer without current MCS certification cannot carry out a BUS-eligible installation.
Is MCS certification required for the Smart Export Guarantee?
Yes. Solar installations must be carried out by an MCS-certified installer and registered with MCS to be eligible for the SEG. AES registers every installation at the point of completion.
How do I check if an installer is MCS-certified?
Search the MCS installer database at mcscertified.com. Enter the company name or postcode to verify current certification status. Always check directly rather than taking the company’s word for it.
What is the difference between MCS certification and manufacturer approval?
MCS certification is a cross-brand quality standard for small-scale renewable installations. Manufacturer approval, such as AES’s status as a Mitsubishi approved partner, is a separate accreditation granted by the equipment manufacturer, demonstrating competence working with their specific products.
Can I complain to MCS if an installation goes wrong?
MCS has a consumer code and a complaints process. If you have a dispute with an MCS-certified installer that cannot be resolved directly, MCS can be contacted through their certification body. Details are available at mcscertified.com.
