What do K0, K1, K2, K3 and UN mean in an older condition report?

Reports from before October 2020 use K-codes. Here is how they map to today's colours.

Older condition reports use letter codes instead of colours.

Code	Meaning	Today's colour
K0	Cosmetic damage	No colour
K1	Less serious damage	Grey
K2	Serious damage	Yellow
K3	Critical damage	Red
UN	Needs further investigation	Black

K3 and UN are the ones to look at first. UN means the building expert saw something but could not judge the extent. It can be anything from nothing to an expensive repair.

Is an old report still valid?

A condition report is valid for 6 months for the purpose of home buyer's insurance. If it is older, the seller must get a new one or a renewal before you can take out insurance based on it.