Fix the 1 car garage or Build a 2 car garage?

[Christopher Boggs]

So I just picked up this property in South Euclid, Ohio. We are still not sure whether we are going to rent or fix n' flip this one, but I am going to ask the question anyways. The house should fetch about $900 a month in rent.

The 1 car garage the house currently has needs:

A new slab, so it needs to be jacked up - $3000
New roof - $1500
Scrape and Paint - $1000
Total - $5500.

I got a quote for a new 2 car garage: Monopour foundation/slab, 20' x 20', vinyl siding, man door, window. $10,500 total price.

What do you guys think I should do? Does a 2 car fetch considerably more rent? Will it largely effect the sale price?

Pictures (6) - http://imgur.com/a/sJ3MS