Housing Microfinance - Is it profitable?

We are looking to introduce HMF to our portfolio. The ticket size is bigger and will help the ENR grow rapidly. The questions I have in mind are:

How easy is it to secure the loan in the absence of formal land / house titles?

What securities/collateral may be considered?

Ideal APR range?

I will appreciate comments from different parts of the world where HMF has been tested successfully.

Thanks

Fareed Ashraf Chaudhry
 (Manager Marketingand product Development @ Khushhalibank, Pakistan)