Rent potential / value added of adding a garage?

[Andrew Whicker]

Hi,

I'm interested in a 3 bed, 1 bath / unit duplex.  The duplex has a large yard and driveway, but has no garage (plenty of room for it).

The duplex is an up / down that I think can go for 650 - 700 / month of rent.

I want to build a free standing two car garage.  How much does a separate garage stall for each side increase rents / equity?  I understand you can't give me hard numbers, but I'm just curious of examples or rough estimates.

Thanks,

Andy