What Rightmove Doesn't Show You: 10 Property Data Points Portals Leave Out

Why Portals Have Data Gaps

Property portals are built to market properties, not to serve as comprehensive data repositories. Their commercial model depends on agents paying to list properties and buyers and sellers engaging with those listings. Data that does not directly serve that transaction — environmental risk, historic designations, title history — has historically not been a priority.

The result is that Rightmove, Zoopla, and OnTheMarket show you a curated slice of what is publicly known about a property. Here are ten significant data points they leave out.

1. Full EPC History

Portals display the current EPC rating for a listed property, but they do not show the full certificate history. Every EPC ever lodged for a property is held in the official Domestic EPC Register, maintained by the Ministry of Housing. If a property has had three EPCs over fifteen years — reflecting successive owners improving insulation, replacing a boiler, or adding solar panels — that history tells a story about the property's condition and likely costs.

Property Passport UK surfaces the full EPC history for every address, including previous ratings, lodgement dates, and the specific recommendations from each certificate.

2. Flood Zone Classification

Some portals include a basic flood risk indicator, but it is often presented without the underlying data category. The Environment Agency classifies land into Flood Zone 1 (low risk), Flood Zone 2 (medium risk), and Flood Zone 3 (high risk), with Zone 3 further split between flood plain and functional flood plain. A property in Flood Zone 3b faces near-certain annual flooding and may be uninsurable at standard rates. This distinction is critical for buyers and entirely absent from standard portal listings.

3. Listed Building Status

If a property is a listed building, permitted development rights are curtailed or removed entirely, and any changes to the structure require listed building consent in addition to planning permission. The Historic England National Heritage List for England (NHLE) records every listed building, scheduled monument, and registered park. Portals do not routinely flag this status, even for Grade I and II* buildings where restrictions are most onerous.

4. Conservation Area Designation

Living in a conservation area affects what you can do to the exterior of your property. Some permitted development rights — replacing windows, adding satellite dishes, cladding exterior walls — are restricted in conservation areas. Local authority boundaries for conservation areas are publicly available but are not surfaced by portals.

5. Title Tenure (Freehold, Leasehold, or Commonhold)

Portals increasingly display tenure on listing pages, but they do not always get it right, and tenure for sold (non-listed) properties is often missing entirely. The definitive source is the HMLR title register, which records tenure as a matter of legal fact. For leasehold properties, the portal listing tells you nothing about remaining lease term, ground rent structure, or service charge history — all of which materially affect value and mortgageability.

6. Planning History

Every planning application submitted to a local authority is a matter of public record, but portals do not link to this data. A property may have had planning applications refused, have an outstanding enforcement notice, or be subject to a planning condition that restricts use. The Planning Portal aggregates applications from many local authorities, but the data is not joined to property listings.

7. Sold Price Transaction Category

As covered in our guide on HMLR data, Rightmove does not distinguish between standard market transactions and non-standard ones (repossessions, right-to-buy sales, transfers at undervalue). If you are using sold prices to assess market value, including non-standard transactions will distort the analysis.

8. Radon Risk

Public Health England publishes radon affected area maps covering England and Wales. Properties in high radon potential areas may require radon testing and potentially remediation works. This is a statutory disclosure in some circumstances, but portals do not surface it.

9. Subsidence and Ground Stability Risk

The British Geological Survey and coal authority publish data on ground stability risks, including coal mining legacy, natural subsidence, and soluble rock areas. Properties in these areas may require specialist insurance and structural investigation. Environmental search providers such as Groundsure include this data, but portals do not.

10. Broadband Infrastructure Type

Ofcom's Connected Nations data distinguishes between premises served by full-fibre (FTTP), part-fibre (FTTC), and copper-only broadband. This distinction significantly affects achievable speeds and future resilience. While some portal listings include a headline broadband speed figure, the underlying infrastructure type — which determines whether a property can realistically achieve gigabit speeds — is not routinely shown.

Where to Find What Portals Miss

Property Passport UK brings together the first five categories — EPC, flood, heritage, title, and price paid — in a single free search, sourced directly from official registers.