Find a flat's share of the plot and the land value behind it — from a known fraction, from floor areas, or from values.
Enter the share
Pick how you know the share, then add the plot area and land unit price for the land value.
Land share is legally set by unit value at construction; by-area is a common proxy. Land value = share × plot area × unit price.
Land share 1.43% · My land 11.46 m² · My land value 171,975 £Land share of a flat. Work out an apartment's share of the plot and its land value, from a fraction, floor areas or values. Instant in-browser calculation, no account. Last updated: 13 July 2026.
⚖︎ Results are for informational purposes and do not constitute tax advice. For specific situations, consult a licensed accountant or the relevant tax authority.
The land share is the flat's proportion of the plot. Multiply it by the plot area for your land, and by the land unit price for your land value:
A 15/100 share of an 800 m² plot at £15,000/m²: 0.15 × 800 = 120 m² → £1,800,000 land value.
It is an apartment's ownership share of the common land the building sits on, usually recorded as a fraction on the title. It determines your slice of the plot's value and, often, your share of common costs and votes.
Legally it is set in proportion to each unit's value at the time of construction. In practice people also approximate it by floor area: your unit's area ÷ the total area of all units. This tool supports fraction, by-area and by-value modes.
Multiply your land share by the plot area to get your land in m², then by the land unit price. This is the figure that matters most in urban-renewal and developer-share negotiations.
The legally correct basis is value at construction. By-area is a common, simpler proxy that works when units are broadly similar; it can differ from the value-based share for units with better floors, views or frontage.