Cost of Garage Conversion

[Sean Autry]

Hi BP Community- I’m looking at a deal in Hesperia, CA. It’s a duplex separated in the middle by a 2 car garage and a one car garage (both are enclosed, this is one continuous structure).

I want to covert both garages into a single one bedroom unit, making this duplex a triplex.

(1) for this of you who have done this, we’re you happy with the outcome?

(2) in rough terms, how much should it cost?

It has w/d hookups, so plumbing is already there.

[Alexander Hish]

You're forgetting sewer hookup. A W/D hookup isn't going to have a 4" drain to the sewer. Also what diameter is the line coming in from the city and to the W/D. It won't pass code if its too small for 3 units and or the line to W/D is only 1/4". Is this on slab or is there easy access to the plumbing under the garage. You must maintain a 1/4-inch-per-foot slope tie-in to the sewer. Otherwise you can run a macerating toilet or ejector pump. but again that eventually needs to find its way to the sewage line(s) Electrical is also a concern. Kitchens require dedicated circuits for all the appliances. You're looking at a 100 or 200 amp service to be added, or tied in to the building. Depending on where the service comes into the building the cost can vary greatly. 

The property would have to be described better for a more detailed response.