An Electrical Certificate of Compliance does not have a blanket two-year expiry for ordinary continued use. The two-year period matters when ownership changes: the user or lessor may not rely on a certificate older than two years for transfer.
Even a newer certificate is not a free pass for later changes. If electrical work is added or altered after the issue date, that work must be appropriately inspected, tested and certified. Damage, deterioration or unauthorised work can also make the current condition unsafe.
01
The two-year transfer rule in plain language
When a property changes ownership, a certificate older than two years cannot be used for the transfer under the Electrical Installation Regulations. A fresh inspection and compliant certificate are therefore normally arranged.
This does not mean every homeowner must automatically buy a new COC every two years while nothing changes. It means the age limit is a specific transfer requirement.
| Situation | Practical position |
|---|---|
| Living in the property; no alterations | No automatic two-year renewal rule, but maintain the installation safely |
| Selling or transferring | Do not rely on a certificate older than two years |
| Electrical addition or alteration | The new work needs appropriate inspection, testing and certification |
| Damage or suspected unsafe work | Arrange inspection regardless of certificate age |
02
What can make an old certificate incomplete?
A certificate records compliance of the installation it covers at the time it was issued. Later fixed wiring may fall outside that record. Compare the issue date with renovation invoices and look for changes around the DB.
- New plugs, lights or appliance circuits
- Kitchen, bathroom, cottage or garage renovation
- Pool pump, borehole, gate or outbuilding supply
- Distribution-board changes or added sub-boards
- Inverter, solar or generator connection
- Unrecorded DIY or contractor alterations
03
How to manage more than one certificate
A property can have an original COC plus later certificates covering additions or alterations. Keep them together so the documented scopes form a clear history. Label files by property, date and area of work.
Before a sale, give the registered person all available certificates and test reports. They can determine what inspection and documentation are needed for the installation as it stands.
04
When to inspect even if the COC is recent
A piece of paper cannot prevent a loose connection, water damage or later tampering. Arrange help when there is repeated tripping, heat, burning smells, buzzing, shock sensation, cracked equipment or visible damage.
05
Before selling: the document checklist
Check the issue date, property details, test report and scope. Gather certificates for solar, generators, electric fences and later additions. Tell the electrician about known renovations so nothing important is missed.
Book early enough for defects to be repaired and retested. A certificate can only be issued after the applicable installation complies.
FAQ
Questions readers also ask
Does an Electrical COC expire after two years?
Not automatically for every ordinary-use situation. The two-year limit applies when the property changes ownership: a certificate older than two years may not be relied on for transfer.
Is a COC still valid after adding an inverter?
The original certificate does not automatically cover later fixed electrical work. The inverter or alternative-supply work needs appropriate inspection, testing and certification, with documents kept together.
Can a property have more than one COC?
Yes. Later certificates can cover additions or alterations. Keep every certificate and test report so the installation's documented history is clear.
Do I need a new COC if nothing has changed?
There is no blanket two-year renewal requirement for ordinary continued use. A transfer, alteration, damage or concern about safety can trigger the need for a new inspection or additional certification.
