PropeteerProperty intelligence

Property value guide

Why property sales history can look wrong

An implausible sales history often means records for related but different addresses were joined. Flats, house-number suffixes, named buildings and subdivisions must be matched carefully; a changing property-type label is a warning to review identity.

Written and reviewed by Propeteer Research TeamPublished Reviewed

At a glance

Key facts

Common collision
1 and 1A, house and flat, building and unit
Warning
Unexplained type or price discontinuity
Strong identity
Exact address components and stable identifiers

A reliable process

How to approach the question.

  1. 01Normalise the address without discarding flat or suffix information.
  2. 02Group records by exact property identity rather than street number alone.
  3. 03Inspect tenure, type, price sequence and transaction category.
  4. 04Keep uncertain records visible but exclude them from calculations.

Worked example

1 The Riding and 1A The Riding

If number parsing strips the suffix, transactions for two homes can appear as one history, producing impossible price and type changes. The safe response is to split the identities and lower confidence until verified.

What this does not prove

  • Public transaction records can be corrected or updated.
  • Real conversions and substantial changes can also alter property type.
  • Identity checks do not establish legal title boundaries.

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

Price Paid DataHM Land RegistryOS Open UPRNOrdnance Survey

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

Related guides

How to value a property using comparable sales

Select, adjust and reconcile UK comparable sales by recency, location, property type, floor area, condition and tenure.

Why floor area or EPC data may be missing

Learn why a recent sale may not have a matchable EPC and how address differences, exemptions, timing and property subdivisions affect floor-area evidence.

Apply this guide

Start with the exact UK address.

Research a property