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Property value guide

Why floor area or EPC data may be missing

A recent sale does not guarantee a public EPC match. The certificate may use a different address, relate to a whole building rather than a unit, fall outside the available dataset or not exist for a valid reason. Missing should be stated, not silently estimated.

Written and reviewed by Propeteer Research TeamPublished Reviewed

At a glance

Key facts

Recent sale
Does not guarantee a matched certificate
Common issue
Address or unit mismatch
Safe fallback
User-provided area labelled with provenance

A reliable process

How to approach the question.

  1. 01Search exact and alternative address forms.
  2. 02Check whether the certificate belongs to the unit, building or another property.
  3. 03Compare lodgement dates and property identifiers.
  4. 04Allow a user area with source labelling, while retaining that it was not EPC-derived.

Worked example

Apartment 305 versus Flat 305

The sale can match the apartment text while the certificate uses a building name and flat format. Matching must preserve the unit number and reject certificates for neighbouring units even when the postcode is identical.

What this does not prove

  • EPC floor area is not a measured survey for valuation purposes.
  • Certificates can be stale relative to later alterations.
  • A missing match should not be converted into a zero area.

Method used

  • Resolve the property identity before joining sales, certificates, floor area and local market evidence.
  • Prefer recent completed sales of genuinely comparable homes and explain each adjustment rather than averaging every nearby transaction.
  • Use a range and reduce confidence where the evidence is sparse, contradictory or dependent on unverified property characteristics.

Primary sources and official guidance

Energy Performance of Buildings DataDepartment for Levelling Up, Housing and CommunitiesOS Open UPRNOrdnance SurveyPrice Paid DataHM Land Registry

Source scope, licensing, refresh expectations and known limitations are listed in the public data-source register.

Related guides

Price per square foot explained

Use price per square foot carefully by matching floor-area source, property type, condition and sale date.

Why property sales history can look wrong

Understand address collisions, flats, suffixes, subdivisions, property-type changes, Land Registry revisions and identity mismatches.

Apply this guide

Start with the exact UK address.

Research a property