The quality of an equipment upgrade and the quality of its CAE evidence are separate matters. A new unit may perform well while the application fails to prove what it replaced, where it was installed or which model was supplied. Documentation should therefore begin before procurement and continue through removal, installation, commissioning and payment. The exact list comes from the applicable measure and current procedural requirements.
Evidence of the previous installation
Photograph the old equipment in its operating location before removal. Capture the full installation, connections, controls and a readable identification plate. Record make, model, serial number, capacity, fuel or energy source and other characteristics required by the measure. If the plate is missing or unreadable, look for maintenance records, manuals, earlier invoices or technical registers.
Do not assume that age or appearance proves inefficiency. The baseline must follow the applicable catalogue sheet or singular methodology. If a default value is permitted, cite the rule that permits it rather than presenting it as a measured fact.
Procurement and invoice records
Quotations and orders should name the exact models, quantities, capacities and services. Final invoices should be itemised enough to distinguish eligible equipment from unrelated work. The customer name, installation address, dates and tax information should agree with the rest of the file or have a clear explanation.
Keep proof of payment and any credit notes or revised invoices. A quotation alone does not prove completion or payment. If the supplier substitutes a model, retain the approval, revised technical sheet and reason for the change, then reassess whether the selected CAE measure still applies.
Technical and installation documents
Collect manufacturer data sheets, declarations or labels required by the measure, installation certificates, test records, commissioning sheets and equipment registers. Product literature should identify the supplied model rather than a broad range with several performance options. Mark the exact variant without altering the source document.
Installation evidence should connect the product to the site. Photograph labels after installation and include wider views showing location and connections. Where several identical units are installed, use a serial-number and location schedule. The invoiced quantity, photographed assets and calculation quantity must reconcile.
Build an audit trail
Create folders for baseline, contracts, procurement, implementation, payment, calculation, verification and correspondence. Use filenames with dates and asset identifiers. Keep source photographs at their original resolution and preserve raw meter exports. A compressed report can be useful, but it should not become the only surviving evidence.
Use a traceability table linking each requirement to a file and page. Add the source for every calculation input. This allows the preparer and verifier to find evidence quickly and exposes gaps before submission.
Pre-submission checklist and safeguards
Check that the equipment is eligible under the current measure; old and new characteristics are supported; dates form a coherent sequence; names and addresses match; invoices and payments reconcile; models and quantities agree; photographs are legible; commissioning is complete; and the CAE agreement or private energy-savings transfer contract covers the same project.
Never create, alter or backdate evidence to fill a gap. Record a genuine discrepancy and seek an acceptable supporting source or clarification. Complete documentation improves the application but does not guarantee certification. Technical verification and administrative review may still adjust or reject the claimed savings.