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StandardsHow to check an MCS certificate is genuine, before the deposit leaves your account
A logo on a van proves nothing. Certification is held by a specific business, for specific technologies, through a named certification body, and all three of those things are checkable before you sign.
Updated 4 August 2026 · written by the Clearline guidance team
Three things a badge does not tell you
Every renewable energy quotation arrives decorated with logos. Most of them are meaningless to you. The three that matter are all verifiable, and the checks take about ten minutes.
- Which legal entity is certified. Certification is held by a business. A trading name on a leaflet is not necessarily the company that will sign your contract, and the two need to match.
- Which technologies it covers. A firm certified for solar PV is not automatically certified for battery storage or heat pumps. Certification is technology by technology.
- Which certification body issued it. Installer certification is carried out by bodies accredited by UKAS, the United Kingdom Accreditation Service, not by MCS directly. NAPIT and NICEIC are the two names you will see most.
The single check that catches most problems
Ask which company name will appear on the contract, and then ask which certification body certifies that exact company, for which technologies. If the answer is vague, or the contracting entity is different from the certified one, stop there. That mismatch is what leaves homeowners without an MCS certificate at the end.
The verification sequence
Get the exact company name
The full registered name that will appear on the contract, not the trading name on the website. Ask for the company number too.
Ask for the certification body and the certificate
Which UKAS accredited body certifies them, and for which technologies. Ask for a copy of the current certificate rather than a screenshot of a logo.
Verify with the source, not the seller
Check the position against MCS consumer information and against the certification body named. A firm that is genuinely certified will have no problem with you doing this.
Check the consumer protection separately
Which MCS approved financial protection product applies, or which consumer code the firm belongs to, and get the membership number.
Confirm the certificate will be issued to you
Get it in the quotation that the installation will be MCS certified and that you will receive the certificate for your address.
Certification of installers is carried out by certification bodies accredited by UKAS rather than by MCS itself, so the certification body is the authoritative check on whether a specific business currently holds certification for a specific technology. MCS publishes consumer guidance covering the scheme, the technologies it covers and the incentives that depend on it.
What the badge does prove
A current MCS certification for the right technology tells you that the business is assessed against MCS Installation Standards, that it must use MCS certified products, and that the installation it delivers can be certified, which is what unlocks Smart Export Guarantee payments and most government incentives. More than 2.5 million MCS certified systems are now installed across UK homes and small businesses.
Under the redeveloped scheme, it also now tells you that MCS runs back office checks on the business, covering financial performance, directors, public domain information, complaint history and legal proceedings, and that the firm holds an Installer Agreement directly with MCS. Complaints are managed centrally by MCS rather than routed through a consumer code. Our guide to what MCS certification is covers the 2026 changes in full.
What the badge does not prove
Certification is a floor, not a ranking. It says the business meets the standard. It does not tell you the design is right for your roof, that the quote is competitive, that the crew doing your job is the crew that was assessed, or that the system was sized against your actual consumption rather than a national average.
The commonest failure is design, not certification
Most of the disappointing solar installations we are asked to look at were fitted by certified firms. What went wrong was the sizing, the shading assessment or the tariff assumption behind the savings figure. Verify the certification, then interrogate the design separately.
Red flags worth stopping for
- A deposit request above 25 percent of the contract value, which runs against consumer guidance from both HIES and RECC
- Pressure to start installation inside the 14 day cancellation period, which requires your express written request and changes your position
- A refusal to name the certification body, or a certificate in a different company name
- A savings figure with no stated tariff, no stated consumption and no date on it
- A quotation that does not say whether the connection is a G98 notification or a G99 application
The last one matters more than it looks. If the design has not established which network operator route applies, the design is not finished. Our guide to what a G99 application involves explains where the line sits and why a battery so often crosses it.
If the installer is certified under Flexi-Orb instead
Flexi-Orb runs an installation standards scheme for solar PV, batteries and EV chargers and is recognised for Smart Export Guarantee eligibility as an MCS equivalent, including by Octopus Energy. It reports UKAS recognition to ISO 17067:2013. For export payments alone, that is a valid route.
The limitation is grants. MCS remains the only scheme recognised for access to some government backed grants, including the Boiler Upgrade Scheme. If a heat pump might follow the solar, MCS is the safer certification to insist on now, because certification cannot be applied to an installation retrospectively.
Send us the quote and the company name. A free remote design call will tell you what the certification covers and whether the design stands up.
Get your free quote →After the work: the documents that prove it happened properly
Verification does not end at the deposit. These are the documents that should reach you, and each has a different chaser if it does not.
| Document | Who to chase |
|---|---|
| MCS certificate for the installation | The installer first, then their certification body |
| G98 notification or G99 acceptance | The installer, who submits it to the network operator |
| Building regulations compliance certificate | The installer's competent person scheme |
| Electrical installation certificate | The installer |
| Workmanship guarantee and IBG certificate | The installer, then the consumer code or insurer named |
| Deposit protection certificate | The consumer code the installer belongs to |
| Manufacturer warranty registrations | The installer, then the manufacturer directly |
| Handover pack with the performance estimate | The installer |
Assembled from MCS, HIES and network operator documentation, accessed August 2026.
Clearline gives independent guidance and does not install anything. Installations are carried out by an MCS-certified installation team for your area, which is why we can tell you to check us as hard as you check anyone else. Start with solar panels, compare the protection schemes in our scheme comparison, and use the local calculator on your county page or the help section for the process.
Scheme detail was checked against MCS, NAPIT, RECC, HIES and Flexi-Orb material in August 2026, during an active MCS installer transition.
Checking an installer, answered
How do I check if a solar installer is MCS certified?
Get the exact registered company name that will appear on your contract, ask which UKAS accredited certification body certifies them and for which technologies, then verify with that body and with MCS consumer information rather than taking the logo at face value. Certification is held by the business, not by an individual fitter.
Is MCS certification technology specific?
Yes. A business certified for solar PV is not automatically certified for battery storage, heat pumps, solar heating or small wind. If your quotation covers more than one technology, check the certification covers each one, because the MCS certificate for the installation depends on it.
Who actually issues MCS certification?
Certification bodies accredited by UKAS, the United Kingdom Accreditation Service, rather than MCS itself. NAPIT and NICEIC are the names most commonly seen on UK domestic solar and battery paperwork, and both also operate competent person schemes for building regulations.
What if the certificate is in a different company name?
Treat it as a stop sign. Certification attaches to a legal entity, and if the contracting company is not the certified company, the installation may not be certifiable. Ask for the certificate in the name of the business that will sign your contract before you pay anything.
Does an MCS certified installer guarantee a good installation?
No. Certification is a floor rather than a ranking. It confirms assessment against MCS Installation Standards and the use of certified products. It does not confirm that the system was sized for your consumption, that shading was properly assessed, or that the savings figure you were shown is realistic.
What if my installation team is Flexi-Orb certified rather than MCS?
For Smart Export Guarantee eligibility that is a recognised equivalent, accepted by SEG suppliers including Octopus Energy, and Flexi-Orb reports UKAS recognition to ISO 17067:2013. For government backed grants such as the Boiler Upgrade Scheme, MCS remains the only recognised route.
How long should I wait for my MCS certificate?
Under the redeveloped MCS installer scheme the certificate creation window is 30 days from commissioning, extended from the previous 14 days. If nothing has arrived by then, chase the installer, then their certification body, and keep the correspondence.
See the numbers next: Duracell Dura16, installed, or the battery storage guide.
Figures and specifications in this guide are sourced below and were checked on the date shown. Rates and product specifications change; we confirm the current picture on your free design call.
Sources
- MCS, about the scheme: UKAS accredited certification bodies, 2.5 million certified systems mcscertified.com
- MCS, consumer pages: technologies, grants and incentives, no retrospective certification mcscertified.com
- MCS, redeveloped installer scheme: 30 day certificate window, centralised complaints, Installer Agreement mcscertified.com
- NICEIC, redeveloped MCS installer scheme: back office checks and role changes niceic.com
- NAPIT, MCS scheme pages: certification body and competent person scheme roles napit.org.uk
- RECC, consumer top tips: 25 percent deposit guidance recc.org.uk
- RECC on the Consumer Contracts Regulations 2013: 14 day cancellation recc.org.uk
- HIES, deposit and stage payment protection and insurance backed guarantees hies.org.uk
- Flexi-Orb scheme recognition for SEG eligibility flexi-orb.com
Read next
MCS, HIES, RECC, NAPIT, TrustMark and Flexi-Orb: which badge does what
Six logos, six different jobs. What each scheme covers, and which are actually required.
Read the guide →Your MCS certificate: what it shows, when it arrives, and how a Smart Export Guarantee supplier uses it
The document your export payments hang on. Who issues it, what it shows, and how to get a copy.
Read the guide →What MCS certification actually buys you on a heat pump job
The gate on the £7,500 grant, the design standard behind your running costs, and the noise sign-off.
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