How we work out value — and what we won't claim

The HausScore

The HausScore is a 0–100 summary of everything we can evidence about an address. It is built from five weighted sub-scores. Where we hold no data for a sub-score, it is shown as Unavailable and removed from the calculation — we never fill a gap with an assumption to make a score look complete.

• Value evidence

  Weight 30%

  Strength and recency of Land Registry comparable sales behind the estimate, and how tightly they agree.

• Market activity

  Weight 25%

  Live HausMart listings, sold-versus-asking gap and outcode price trend over the last 12 months.

• Energy & running costs

  Weight 20%

  EPC rating and floor area where a certificate exists for the address.

• Property facts

  Weight 15%

  Type, tenure, size and age signals drawn from public records and listing history.

• Local context

  Weight 10%

  Area-level indicators. Planning, schools, transport, environment and crime join this in Phase 2 and are marked Unavailable until then.

The valuation engine

1. 1Find every recorded sale at the address, then every comparable sale within a widening radius of the postcode.
2. 2Weight each comparable by distance, how recently it sold, and how closely the property type and size match.
3. 3Index historic prices forward to today using the UK House Price Index for the local authority.
4. 4Blend the weighted comparables into a central estimate, with a low and high range set by the spread of the evidence.
5. 5Publish a confidence level — high, medium or low — driven by comparable count, recency and agreement.

Data sources

Limitations and disclaimer

• Reports cover England and Wales. Scotland and Northern Ireland use different registries and are not yet included.
• Land Registry data reflects completed, registered sales, so the most recent months are always incomplete.
• We cannot see inside a home. Condition, extensions, refurbishment and outlook can move a real price well outside our range.
• HausMart Property Intelligence is guidance only — not a RICS valuation, mortgage valuation, survey or legal advice.

Frequently asked questions

How is the HausScore calculated?

The HausScore is a 0–100 score built from weighted sub-scores covering value evidence, market activity, energy efficiency, property facts and local context. Each sub-score is only counted when we hold real data for it; anything we cannot evidence is shown as 'Unavailable' and excluded from the total rather than guessed.

How does the HausMart valuation work?

We start from HM Land Registry Price Paid records for the address and its immediate area, weight comparable sales by distance, recency and property similarity, then index them forward using the UK House Price Index for the local authority. We publish a central estimate with a low and high range plus a confidence level based on how many strong comparables we found.

Why is the valuation range sometimes wide?

A wide range means low confidence: few recent sales nearby, an unusual property type, or a long gap since the last recorded transaction. We would rather show an honest range than a precise-looking number we cannot support.

Where does the price history come from?

Every recorded sale since 1995 comes from HM Land Registry Price Paid Data for England and Wales. It records completed sales lodged for registration, so very recent completions can take a few months to appear, and it excludes some transfer types such as certain right-to-buy and company transactions.

Is the report a formal valuation or survey?

No. HausMart Property Intelligence is an automated, data-led estimate for guidance only. It is not a RICS valuation, a mortgage valuation, a survey or legal advice, and it should not be relied on as the sole basis for a purchase, sale or lending decision.

How often is the data updated?

Land Registry Price Paid Data and the House Price Index refresh monthly, postcode geocoding quarterly, and HausMart's own live listing and buyer-demand signals update continuously. Every report shows the date it was generated.