Minor Works Certificate explained: when to use a MEIWC (and when you can’t)
BS 7671 gives electricians three certification routes: the Electrical Installation Certificate (EIC), the Minor Electrical Installation Works Certificate (MEIWC) and the EICR for periodic inspections. The minor works certificate is the quickest of the three — but only some jobs qualify for it, and using it for the wrong job is one of the most common certification mistakes.
What is a Minor Works Certificate?
The Minor Electrical Installation Works Certificate (MEIWC) is the BS 7671 certificate for additions and alterations to an existing circuit that do not include a new circuit. It confirms the work was designed, constructed, inspected and tested in line with the wiring regulations, and it records the test results that prove the altered circuit is safe.
It exists so that small jobs don’t need the full Electrical Installation Certificate. It is not a lesser certificate — the inspection and testing behind it are real — it is simply scoped to work on one existing circuit.
When a minor works certificate is the right form
Typical jobs an MEIWC covers:
- Adding a socket outlet or fused spur to an existing circuit
- Adding a lighting point or switch to an existing lighting circuit
- Relocating a socket, switch or light point
- Replacing a damaged accessory where some alteration to the circuit is involved
When you can’t use one
An MEIWC must not be used for:
- A new circuit — that needs an Electrical Installation Certificate (EIC)
- A consumer unit (fuse board) replacement — EIC
- A full or partial rewire — EIC
- Periodic inspection of an existing installation — that’s an EICR, which reports on condition rather than certifying new work
What must be recorded on it
The BS 7671 model form requires, per circuit worked on:
- A description of the minor works and the installation details (earthing arrangement, protective device)
- Test results: continuity, insulation resistance, polarity, earth fault loop impedance (Zs), and RCD operation where an RCD protects the circuit
- The competent person’s name, signature and the date
- Any departures or observations — including pre-existing defects found on the circuit
Where Part P fits in
In England, Part P of the Building Regulations makes certain domestic electrical work notifiable to building control: installing a new circuit, replacing a consumer unit, or work in the zones of a room containing a bath or shower. Notifiable work done by an electrician registered with a competent person scheme (NICEIC, NAPIT and others) is self-certified through the scheme; otherwise it must go through building control directly, which costs more than the job in many cases.
Most minor works — adding a socket to an existing circuit in a normal room, for example — are not notifiable, but they still legally must be safe, and certifying them protects you and the customer.
Producing minor works certificates on site
The certificate is a five-minute form that too often waits until the evening. TradeHub OS produces MEIWCs, EICs and EICRs on your phone — circuit details, test results, your registration number and a drawn signature on the PDF — emailed to the customer before you leave and stored against the job, quote and invoice.
This guide is general information for UK trades and landlords, not legal advice. Always refer to the current regulations and official guidance from the HSE, Gas Safe Register or your competent-person scheme.
