The Thane-versus-Mumbai question usually gets answered with price per square foot, which is the least useful number in the comparison. What matters is what you get for a fixed budget once you account for carpet area, commute time and the age of the building.

At ₹1.5 Cr

In Thane West this buys a well-specified 2 BHK of roughly 650 to 800 sq.ft. carpet in a new project with a full amenity deck. The same budget in Malad or Goregaon buys a smaller 1 or compact 2 BHK, often in a building over fifteen years old.

At ₹2.5 Cr

This is where the comparison gets interesting. Thane gives you a 3 BHK above 1,100 sq.ft. carpet in a premium project. Mumbai's western suburbs give you a 2 BHK in a good location, or a 3 BHK further north. The decision turns almost entirely on where you work.

At ₹5 Cr and above

Above ₹5 Cr the logic inverts. Thane's supply of genuinely premium inventory thins out, while Mumbai opens up addresses — Bandra, Vile Parle, Khar — with scarcity value that Thane cannot replicate. At this level you are buying the location, not the floor plan.

The commute variable

Every comparison should be run against your actual workplace. A BKC-based buyer paying a Bandra East premium may be making a better financial decision than one saving ₹80 lakh in Thane and spending three hours a day travelling. Metro Line 4 changes this arithmetic, but not until it is fully operational.