The redeveloped MCS scheme puts a named Technical Supervisor on every certificate. The evidence MCS expects, what they answer for, and who can hold it.
Under the redeveloped MCS installer scheme, every certified business has to assign three roles: a Licensee, a Main Contact, and one or more Technical Supervisors. The first two are administrative in character. The Technical Supervisor is the one that touches every job you do, because their name goes on every MCS certificate you raise, and their qualifications are evidence your certification body will actually check. With the scheme rollout running alongside the demand the Warm Homes Plan is expected to create, the certificate trail behind each job is about to matter to more installs a year than it ever has.
If you are moving over to the redeveloped scheme, or planning MCS certification for the first time, here is what the role requires, what the person is accountable for, and the decisions you need to make about who holds it.
The Technical Supervisor is defined by MCS as the person responsible for ensuring that, for a specific installation, the technology installed is compliant with MCS scheme requirements. That means the appropriate MCS Installation Standard, the Pre-sale Information and System Performance Estimate Standard, other relevant industry standards, and the manufacturer's instructions.
The wording matters. The old Nominated Technical Person was a scheme-level role: one named person who represented the technical competence of the business. The Technical Supervisor is linked to individual installations instead. Every certificate in the MCS Installations Database is a declaration that a specific person confirmed that this install, on this property, met the standards that apply to it.
That is a change in where the accountability sits. It is no longer enough for the business to have someone competent on the books. Each job has to be traceable to a named person who was entitled to say it complied.
At the time you certify an installation, the Technical Supervisor must hold one of two things:
Two parts of that are easy to miss. The first is "in-date": an expired qualification does not count, so if your Technical Supervisor's certificate lapses, the installs certified after that date are being signed off by someone who no longer meets the requirement. The second is per-technology: MCS expects you to evidence to your certification body that any Technical Supervisor you use holds at least one approved qualification for the technology they are declaring to be technically compliant. A heat pump qualification does not cover a solar install, and vice versa. If your business installs several technologies, your Technical Supervisor needs evidence for each one they sign off, or you need more than one Technical Supervisor.
MCS publishes the list of approved training courses that lead to either a qualification or a personnel certification, and the Installer Operating Requirements set out how the role is defined. Your certification body is who you actually evidence it to, and this sits inside the assessment model the redeveloped scheme brings in, where businesses that stay compliant are rewarded with fewer assessments and those that fall short get more of them. The MCS audit checklist covers that side of the transition.
A Technical Supervisor can be directly employed by your business or sub-contracted. That flexibility is deliberate, and it is a real difference from the Main Contact role, which MCS says must be filled by an employee.
If you sub-contract the role, three things are required:
How many Technical Supervisors you need is proportionate to your business. MCS's guidance is that the number must be appropriate to the size and complexity of your MCS activities, and their own examples are the ones that bite growing businesses: installing across different areas of the UK, or installing numerous technologies. A single Technical Supervisor with a single-technology qualification works for a local solar specialist. The moment you are running heat pumps in two regions, one person stops being the right answer, and it becomes a qualification gap your assessment will find rather than one you flagged yourself.
When you raise a certificate in the MCS Installations Database, the full name of the Technical Supervisor is a mandatory field, and the information is available to both MCS and your certification body. The redeveloped scheme also extends the window for raising a certificate after commissioning from 14 to 30 days, which gives more room, but the declaration itself is unchanged in principle: a named person is confirming this installation complied.
The practical version of that is an evidence question. If an assessor asks which Technical Supervisor signed off a particular installation and what qualification supported it at that date, you want the answer in minutes, which is the same evidence trail the audit checklist describes: test results, commissioning data, the certificate, and the named person who confirmed it, findable long after the van has left. Whether it is commissioning records for a heat pump or solar, the sign-off and the evidence sit together on the job, and the certificate that results is the same one a Boiler Upgrade Scheme voucher redemption references, so the grant money waits on the same declaration. If your team uses "commissioning" loosely for everything from the DNO notification to the MCS certificate, it is worth being clear that those are three different end-of-install steps that share evidence but are not the same document.
For a small business, the same person can be Licensee, Main Contact and Technical Supervisor, and MCS confirms one individual can hold multiple roles. That is often the right answer at the start: the owner holds all three while the business is the owner and a van.
The roles separate for a reason as the business grows, and the Technical Supervisor is the one with the per-installation accountability. The Licensee signs the Installer Agreement and carries ultimate responsibility, the Main Contact handles scheme queries, and the Technical Supervisor is the technical spine of every certificate you raise. Reviewing those decisions as the business grows matters more than making them once at certification: more technologies, wider geography, and more certificates a year all change who should be signing off what.
Your certification body manages your move onto the redeveloped scheme and decides when your slot comes up. Under the timetable DESNZ announced on 18 June 2026, the legacy scheme is due to close on 31 March 2027. There is no queue-jumping, but there is preparation, and the Technical Supervisor decision is the part you can settle today:
For the rest of the transition, the MCS readiness checker shows which parts of your setup are ready and which still need work.
The businesses that find the transition straightforward are the ones whose answer to "who signed this off, and on what basis" already exists as a routine rather than a scramble. Keeping that trail attached to the job is what compliance management in Payaca is built for, alongside the job records solar and battery businesses already run commissioning applications from. If you want the certification evidence to be a by-product of doing the job rather than a project in its own right, book a demo.
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