A city survey number is a unique identification code provided for your property in Mumbai. This practice was carried out during the period of 1963 to 1967. It has been of immense significance for both the buyer and seller of a property. This numerical code also goes by many other names, such as CTS number and Chain and Triangulation Survey (CTS) number.

The city survey number is your property's identifier. It helps a buyer to get all information regarding the property prior to purchase and is useful to the owner as this is required for all property-related transactions made. Also, upon acquiring a new property, the CTS number will decide how much stamp duty charges will be levied on that property and also notify the local authority to provide you with the basic amenities such as water and electricity. It will also help in locating your property details in the online land records archive, Mahabhulekh.

CTS number of the property stands for Chain and Triangulation Survey number, and often as the Cadastral Survey Number in Mumbai suburban area. This numerical code will be mentioned in many affairs related to your property. 

Here are some of the reasons why the CTS number is required:

• You will be able to check details regarding the property online in the land records archive.
• It has a significant role to play while registering a new property and also decides the stamp duty charges payable.
• Obtaining this number will help you get approvals related to the modification of the property or even litigation.
• It also helps in tracking unauthorised construction.
• It comes in handy when making enquiries related to property card details.
• Buyers can also check their city survey number online to track legal and transaction-related records prior to making any decision.

You can find the CTS number of a property in the 7/12 extract and the property card as well. If your property is an apartment, you can find the number mentioned on the first page of your agreement. You can also obtain the city survey no. from any of the 10 CTSOs in Mumbai situated at Ghatkopar, Mulund, Chembur, Andheri, Kurla, Borivali, Bandra, Vile-Parle and Malad. All of these offices are under the supervision of the Superintendent of Land Records or Taluk Inspector of Land Records.

The process of allotment of city survey numbers was carried out between the period of 1963 and 1967. A property card with the respective city survey no. was also arranged for the property. This entire system works under the supervision of the Superintendent of Land Records in Mumbai for each district or taluka. 

City survey number does not only hold legal significance, but it also indicates that your property has a legitimate valuation which helps in the time of selling your property. The local authority also needs you to provide this number to facilitate you with the basic amenities of water connection and power.