OPDA Knowledge base
Concept tier descriptive

EPC Certificate

opda:EpcCertificate

EPC Certificate

An EPC Certificate is an Energy Performance Certificate — a DESNZ-governed authority-retrieved artefact recording a Property’s energy-efficiency rating.

Why it matters

EPCs are statutorily required for most residential transactions, have a 10-year validity, and feed into mortgage decisions, regulatory compliance reports, and the property’s marketing material. OPDA models the EPC as a first-class Kind because it has its own authority-retrieved provenance chain (DESNZ central register), its own lifecycle (10-year validity; supersession on re-assessment), and its own PII regime (address + owner-identifiable per ODR-0018).

If you are a conveyancer, lender, or property-data integrator working with EPC data, this is the entity that captures the certificate’s provenance and lifecycle.

Editorial note. The hard cases below are interpretive — derived from the S008 Q4 three-criterion test recorded in the source TTL’s rdfs:comment, not lifted verbatim. Council ratification of a definitive hard-case enumeration for this descriptive Kind is pending.

Hard cases

  • Re-assessed EPC. A new EPC supersedes the previous one mid-validity. The new EPC is its own record with a provenance link to the predecessor; the predecessor is marked as superseded but persists in the audit trail.
  • EPC nearing expiry. Within the 10-year validity window the EPC is current; past the window it is expired. The lifecycle is a property of the EPC, not derived ad-hoc by consumers.
  • Property with no EPC. Some property categories are exempt. The absence of an EPC record is itself meaningful — it does not mean “data missing”, it means “EPC not required”.

Identity Criterion

An EPC Certificate is identified by its (DESNZ register-id, certificate-number) pair. Two records refer to the same EPC only if both components match. See the Logical tier → for the typed structure.

  • Property — an EPC Certificate concerns a Property
  • Survey — a sibling authority-issued artefact (different provenance, different lifecycle)
%%{init: {"theme": "base"}}%% flowchart LR accTitle: EPC Certificate related-Kinds neighbourhood graph accDescr: EPC Certificate as a DESNZ-governed authority-retrieved artefact concerning a Property; 10-year validity window; sibling to other descriptive ride-along artefacts; itself a PII-bearing Kind under DPV. classDef centre fill:#E1BEE7,stroke:#6A1B9A,stroke-width:3px,color:#4A148C classDef cls fill:#B3E5FC,stroke:#0277BD,stroke-width:2px,color:#01579B classDef ext fill:#ECEFF1,stroke:#455A64,stroke-width:2px,color:#263238 EPC["EPC Certificate
(DESNZ, 10y validity)"]:::centre Property["Property"]:::cls Survey["Survey
(sibling artefact)"]:::cls DPV["DPVMappingRecord
(governance)"]:::ext EPC -->|"concerns"| Property EPC -.->|"siblingArtefact"| Survey DPV -.->|"targets"| EPC

Source ODR

ODR-0008 — Property descriptive attributes §Q4a

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