I would suggest you to hold till the Kochi metro project is operational in 2017. Buying a residential apartment at current value may give you 15 to 20% increment if you hold over a period of five to seven years.
The above member has hit the nail on the head and has answered the question in totality. There is not much of a difference between property pricing and trends in Ernakulam and Kochi, The upside is the good average rental prices for residential apartments in the region. The downside in my opinion is that you may have to keep a long term perspective if you really want to get a substantial increase on your investment.
Ernakulam along with Fort Kochi and Mattancherry are the three traditional municipalities of Kochi which were later merged to form the Cochin municipal corporation. The real estate graph of Ernakulam is synonymous with other parts of Kochi and has a good upside in the medium to long term. The region of Kakkanad offers one of the best real estate investment options in the district if Ernakulam thanks to its blooming IT industry.
Kakkanad is also home for a Software Export Promotion Zone (SEPZ) attracting working professionals from all over India. The rental prices in Kakkanad are also strong making it a good investment option.