Survey numbers and subdivisions: keeping land records in step

Every piece of land in Tamil Nadu's records is identified by a survey number. When a survey number is divided — through a sale of part of it, a partition among family members, or other transactions — each portion should get its own subdivision number with its own extent and holder. In practice, records often fall out of step with reality, and a survey number that should have been subdivided years ago becomes a tangle of overlapping claims.

How survey numbers work

• Survey number — the basic unit of land in survey records, such as 245
• Subdivision — a divided portion of a survey number, such as 245/1, 245/2, 245/3
• Further subdivisions may be created as land is divided again, with numbering conventions that vary

Each subdivision should have its own FMB sketch showing its shape and boundaries, and its own patta entry showing the holder and extent. See FMB sketch explained and what is patta.

How records fall out of step

Partial sales without subdivision

An owner sells part of a survey number. The deed describes the sold portion, but the survey number is not subdivided in records. Both the seller and buyer now hold land within the same survey number, but records may not reflect this.

Family partitions

Brothers divide ancestral land. Each farms their own portion, but records still show the original survey number held jointly, or in the father's name.

Multiple transactions over time

Over decades, a survey number may be divided several times, each time without updating records. Eventually, nobody is sure who holds exactly which portion.

Why it matters

• Leases and sales need a clearly defined parcel. A lease describing "2 acres out of survey number 245" without a defined subdivision is weaker than a lease of a specific subdivision with its own FMB.
• Patta may show the wrong extent or wrong holders.
• Boundaries become uncertain. See boundary disputes and encroachment.
• Lenders may be reluctant to finance projects on undivided or unclear parcels.

The subdivision process

Subdivision is handled by the revenue and survey authorities. The general process:

1. Application — the holder applies, often with supporting documents (deed, partition deed, patta)
2. Field survey — a surveyor measures the portion on the ground
3. Preparation of subdivision sketch — the new subdivision is drawn on the FMB
4. Notice — affected parties, such as adjoining holders, may be notified
5. Approval — the subdivision is approved
6. Records updated — new subdivision numbers, FMB sketches and pattas issued

Procedures change from time to time, and online services exist for some steps. Check current requirements with the taluk office or official online services.

Common complications

• Disagreements on boundaries between holders within the survey number
• Measurements that don't add up — the sum of claimed portions exceeds the survey number's extent
• Missing deeds for some portions
• Government land within the survey number
• Deceased holders whose heirs must be identified first. See patta transfer after inheritance.

Subdivision in land aggregation

When developers assemble a large site, many parcels may sit within unsubdivided survey numbers. Subdivision of each portion can be time-consuming, so land teams:

• Identify unsubdivided survey numbers early
• Map all holders within each
• Coordinate subdivision applications where needed
• Plan schedules allowing time for the process

See land aggregation process and pitfalls.

Old and new survey numbers

Re-survey programmes in the past have renumbered survey numbers in some areas. Old deeds may refer to old numbers that no longer exist in current records. Correlation statements or other records can link old and new numbers. This matters for tracing title and searching encumbrance certificates. See tracing a chain of title.

What landowners can do

• Check whether your holding has its own subdivision and patta
• If not, collect the deed or partition document that defines your portion
• Talk with other holders in the same survey number about boundaries
• Apply for subdivision before you need it for a transaction

A worked illustration

Consider a purely illustrative case. Survey number 245 was once held by one farmer. Over the years, part was sold to a neighbour, and the rest passed to three children who divided it informally. Records still show 245 as a single survey number, with the patta in the original farmer's name. A developer interested in one child's portion now faces four questions: who are all the holders, where exactly is each portion, do the claimed areas add up, and does everyone agree? Subdivision answers all four — but only after each has been resolved on the ground.

Common mistakes

• Leasing or buying part of a survey number without defined boundaries
• Ignoring that records show combined or outdated holders
• Relying on informal family divisions
• Not checking old survey numbers in title searches
• Leaving subdivision until a transaction deadline is near

How we help

Through land documentation and due diligence and land aggregation, we identify survey numbers needing subdivision, map holders within them, coordinate field surveys with licensed surveyors, and help bring records in step with the land before projects commit.