Frequently Asked Questions

Dwellify currently only includes properties that have both an Energy Performance Certificate (EPC) and at least one recorded sale in the Land Registry Price Paid dataset. Properties may be missing if:

• The property has never been sold (e.g. inherited, council-owned, or long-held)
• No EPC has been lodged (older properties that haven't been sold or rented)
• The EPC and sale records couldn't be matched by address

Dwellify covers properties across England, Wales and Scotland — currently 4,976,541 properties across 496,797 postcodes. We're continuously expanding coverage as data is processed.

Data is refreshed periodically from the original government sources. Update frequency varies by dataset:

• EPCs — new certificates are published monthly
• Price Paid — transactions typically appear 2–4 months after completion
• House Price Index — published monthly with a 2–3 month lag

Accuracy depends on the method used. Properties with a sale history use the UK House Price Index to adjust the last sale price to today's value — this is the most reliable method, especially for recent sales.

Properties without sale history use a machine learning model that predicts value based on property characteristics. The model's median error is around 9%, meaning half of predictions are within 9% of actual prices.

Valuations don't account for renovations, extensions, interior condition, or other factors not captured in public data. They should be treated as rough guides, not formal valuations. See our disclaimer.

The condition score compares a property's actual sale price against what a model predicts for similar properties. A positive percentage means the property sold for more than expected; negative means less.

This could reflect condition, renovations, a particularly good or bad deal, or features not captured in the data. It's a statistical indicator, not a building survey.

We show the most recent EPC on record for each property. EPCs are valid for 10 years, but the property may have had energy improvements since the assessment. The EPC history tab shows all certificates lodged for the property.

Property addresses are sourced from HM Land Registry Price Paid Data and postcodes from Ordnance Survey Open UPRN — both published under the Open Government Licence. We do not use EPC address data, which is subject to separate copyright restrictions.

Please email [email protected] with the property address or postcode and a description of the issue. Bear in mind that we display data as published by the original source — if the underlying data is wrong, we may not be able to correct it.