I am not a builder. I am looking at properties with garage/shop + apartment.
The two designs pictured are equivalent. From what I have seen most properties take the build out (left) approach.
To me it seems more efficient to build the apartment up. Less slab and less roof. Took 2' off the apt on the out (left) design for not requiring stairs. But also lose storage under the stairs.
Up (right) I understand there is cost to support the apartment.
From a cost perspective which is a better design?
Not sure it matters but cool climate – no A/C.
I am asking because I may purchase land and build.
The model is a 1-5 acre lot with the expectation the buyer would build a main home. I don't need much living space and I want a structure with lowest cost.
Going with $6 sq ft for slab and $7 sf roof is about $8000. Basically the apt gets a free roof and slab with with 2 story. Unless is cost more than $8000 to hang an apartment that should be cheaper.
Best Answer
Yes, two story is probably less cost to build because it has a smaller “footprint”, but it’s less than you think: 1) The footings can be smaller because they are supporting one floor and not two, 2) Two story will require additional square footage for circulation (stairs), 3) Because of the height of your RV, you’ll have additional height requirement than normal which will require special scaffolding for construction, 4) Possible special water pump due to extra height of second floor, 5) Additional space required for “Entry” downstairs, and 6) Extra fire rated protection between garage space and living space above. (Fire material is required between garage and living for single story too, but easier to install and less required.)
Maintenance is more for two story: washing windows, paint, cleaning the gutters, etc.
The two story option gives you more privacy, but you’ll have the largest thighs in the county.