Turning Property into 4 bedroom

[Uri Starr]

Hello,

I'm thinking about buying a property listed as 2 bedroom, but theres a ton of basement space and I want to convert it to a 4 bedroom. I read that you need to have certain window dimensions in basements and a lot about specific height and width. Does anyone know any info on this? And is it easy to put in a new window in a basement? 

Thanks