MCS registration for solar installers: what the scheme requires and how to get registered

Confirm qualifications and insurance before starting the application

At least one person in the business must hold a recognised solar PV installation qualification. City & Guilds 2399 (Solar PV and Battery Storage) and BPEC Solar PV are the most common routes, and training typically costs £400 to £800 per engineer for a one-week course. That person must also hold the 18th Edition Wiring Regulations (C&G 2382-26). Registration with a Part P competent person scheme - through NICEIC, NAPIT, or ELECSA - is required by most certification bodies and, if you already hold it, it simplifies the overall application. On insurance: a minimum of £2 million public liability cover is required (some certification bodies require £5 million). Professional indemnity insurance is required by most; employer liability cover is required if you have employees. Confirm all three are in place before spending time on the quality management system.

Build your quality management system

The quality management system is the document set that describes how your business delivers every installation from first enquiry to final handover. It does not need to be ISO 9001 certified. MCS provides template documentation as a starting point, and the Installer Operating Requirements document (issue 1.0, January 2025) sets out in an appendix exactly which scenarios apply depending on your company size. Your QMS must cover: the design procedure (system sizing, shading analysis using PVGIS or equivalent, energy yield estimate, selection of equipment from the MCS Product Directory); installation procedures; commissioning records; a formal customer complaints process; and a calibration schedule for all test equipment - multimeters, clamp meters, and insulation testers used on PV work must be calibrated annually. Allow four to eight weeks to build, review, and document these procedures before submitting your application. Zigaflow's document templates feature allows installers to build and store standardised versions of design checklists, commissioning records, and customer handover packs - the exact document types the QMS requires.

Assign the three named roles

MCS registration requires your business to name three positions: a Main Contact who handles scheme queries and liaises with the certification body; a Licensee who signs the Installer Agreement and accepts ultimate responsibility for scheme compliance; and a Technical Supervisor who signs off each individual installation as compliant with the relevant MCS Installation Standard (MIS 3002 for solar PV). For smaller businesses and sole traders, one person can hold all three roles. For companies with multiple installers working concurrently, you may need more than one Technical Supervisor, because a named Technical Supervisor must appear on every MCS Installation Certificate issued.

Choose your certification body and submit your application

MCS-approved certification bodies for solar PV include NICEIC (via Certsure), NAPIT, Amtivo (British Assessment Bureau), and Simply Certification. If you are already registered with NICEIC or NAPIT for Part P, applying through the same body can reduce cost and simplify your overall accreditation. Compare fee schedules: application fees run from around £200 to £500, initial audit fees from £800 to £2,000, and annual renewal from approximately £1,000 to £2,000 for a small company. Solar PV (MIS 3002) and battery storage (MIS 3012) are separate technology scopes; adding battery storage to a solar certification typically costs an additional £300 to £700 for the scope assessment. Submit your application with your QMS documentation, insurance certificates, installer qualifications, health and safety records (risk assessments, method statements), and the names for the three required roles. The certification body will review your documentation and may ask for amendments before booking the initial audit.

Pass the initial audit

An assessor from your certification body will visit to inspect at least one completed installation and review your quality management system in practice. The installation they select is most likely to be a recent one, so your first installation during the preparation period should be documented to exactly the standard your QMS describes. The auditor will check that the job records match your procedures, that your MCS Installation Certificate (the MIC) is complete with all mandatory fields, and that the customer handover pack includes the system schematic, commissioning test results, DNO notification reference, operation and maintenance manual, and warranty documentation. If the auditor finds minor issues, the certification body issues a corrective action report with a deadline. Major non-conformances - significant gaps between your documented procedures and what your jobs actually show - can delay certification. The typical timeline from application submission to certification being issued is six to twelve weeks.

Issue MCS Installation Certificates and submit installation data

Once certified, your company appears on the public MCS Contractor Database. Every subsequent installation must generate an MCS Installation Certificate (MIC) with all required fields completed, and that certificate must be handed to the customer at completion. You are also required to submit installation data to the MCS database for every certified job - this is how the scheme tracks the quality of completed systems across the industry. Zigaflow's jobs feature gives solar installers a single record for each installation, linking the pre-sale quote through to job delivery - so the design assessment, commissioning results, and handover documents stay connected to the customer record rather than scattered across email threads and separate files.

Prepare for the annual surveillance audit

MCS certification requires an annual audit by your certification body. The auditor will review all MICs issued since the last audit - checking that design assessments, shading analyses, and handover packs are on file for each one - and will select one or more recent installations for a physical inspection. The QMS documentation must be current, and calibration records for test equipment must be maintained. One of the most frequently cited non-conformances is DC warning labelling: under BS 7671 Regulation 712.514.102, a permanent warning notice is required at every combiner box and distribution board access point on the DC side, indicating that live parts remain energised after isolation. Labels must be durable and fixed to the enclosure. Missing or damaged labels are a common audit failure that is simple to prevent with a documented commissioning checklist. What the annual audit rewards is consistent documentation across all your jobs, not a flawless record on a single showcase installation. An installer who documents every job the same way - using the same checklists, design templates, and handover packs - will find the renewal audit straightforward year on year.