Also known as UDS
When you buy a flat, you buy the flat itself and a share of the land under the building. The share is “undivided” because no specific piece of land is yours; all owners hold the whole plot together. It is usually worked out in proportion to each flat’s area and written in the sale deed in sq ft.
UDS matters most when a building is redeveloped or demolished: the owners’ claim then rests on their share of land. It also explains why, for the same carpet area, a flat in a low-rise building on a big plot can be valued above a flat in a high-rise.
In Tamil Nadu, Karnataka and Andhra Pradesh, UDS is often registered separately from the construction agreement, which affects stamp duty and GST in a builder sale.
Example
An Anna Nagar building of 12 flats stands on 7,200 sq ft. Each 1,200 sq ft flat carries an undivided share of 600 sq ft. When the owners agree to redevelopment, each owner’s 600 sq ft share is what the developer’s offer — a new flat plus cash — is negotiated against.
Figures are illustrative, not market rates.
Questions about Undivided share of land
How is UDS calculated?
Usually in proportion to each flat’s area against the total built area of the building, applied to the plot area. The figure should appear in the sale deed; if it does not, ask the developer to state it.
Why does UDS matter in redevelopment?
When the building comes down, owners keep their share of the land. Their entitlement in the new building and any compensation are negotiated on that basis, so a larger UDS means a stronger position.
Sources
Reviewed