These are a few good B.ARCH colleges in Kerela.

1. National Institute of Technology Calicut

2. College of Engineering, Trivandrum

3. TKM College of Engineering, Kollam

4. Rajiv Gandhi Institute of Technology, Kottayam

5. Government Engineering College, Thrissur

6. MES College of Engineering, Malappuram

7. University of Calicut, Malappuram 

8. CAT College of Architecture, Trivandrurm 

9. Bishop Jerome School of Architecture and Design, Kollam

Here is the link you can use to get a comprehensive list of all colleges and their details like fees, course structure etc.

https://engineering.careers360.com/colleges/list-of-b-arch-in-architecture-engineering-colleges-in-kerala