Short answer
Use price-paid evidence, listing context, local property condition and your after-works assumptions together. No single comparable should decide the valuation.
How it works in Koreograph
The valuation section helps you gather postcode evidence, recent sale context and price trend information. The aim is to support a reasoned valuation range, not produce a single magic number.
Developer view
For a light refurb, comparable condition matters most. For a heavy refurb or conversion, check whether the assumed after-repair value is supported by finished stock, planning constraints, local demand and realistic works scope.