Installer written statement

Written and checked by the Energy Merchants desk · Reviewed 2 October 2026

An installer written statement is a signed record from the person who did the work. It says, in the installer’s own name and under their accreditation, what was installed, where, when, and that it meets the required standards. It sits in the claim file next to the assignment form, photos and serial numbers.

Its purpose is accountability. Behind every certificate is a person who can be asked what they did on that roof, and the statement ties the claim to a named, accredited individual.

In practice

You will usually complete the statement at commissioning, while the details are fresh. It needs the installation address and date, the system size and products, the installer’s name and accreditation number, and a signature. Your trader or registered agent may supply a template. Requirements can change, so confirm the current wording with the Clean Energy Regulator’s guidance, and with the desk if you are unsure.

Two things go wrong repeatedly. The first is inconsistency: the statement says the install was on one date, while the photos and the registry entry say another. The second is the wrong signatory, such as a company director signing for work performed by an accredited installer who was not on site. The person named is the person the CER will contact in an audit. See how STC audits work.

For the full set of evidence, our STC photo requirements and the assignment form guide cover the neighbouring documents.

Common confusion

The installer written statement is not the same as the state electrical compliance certificate (CES, CCEW or similar). The compliance certificate records electrical work under state law. The statement is part of the STC claim. A job can have both, and neither replaces the other.

It is also not the owner’s declaration. The owner signs the assignment form to give up the rights to the certificates. The installer signs a statement about the work.

For terms around the claim, see the certificate trading glossary, and the STC trading page for the flow after lodgement.