Cost & Engineering - Over Detached Garage Room?
We're talking plans & costs with our builder/GC on our 3br-3.5 bthrs 1.5 story cottage style home with detached garage.
We were thinking of adding a 4th room + 3/4 bath over the detached garage =
Estimated to be about 300-400 sq.ft.
With a bathroom.
Staircase to go inside & up.
Builder is saying it could be a big cost around $25k+ because the HVAC & plumbing would be in a different 'envelope' vs. the main house - thus necessitating a sewer lines run down, over, underneath concrete to connect to main house - could be expensive.
Does this sound correct?
Not sure how 'valuable' this addition would be - since it is detached from main house - vs. having just an extra room in the main house would be...
We are squeezed for additional space in the main house plans due to structural reasons (High angled steeple roof lines 2nd floor) - so finding room could necessitate a costly change to the structural profile of the house.
However, we could accept maybe 1/3 of the garage cost & give up the bathroom.
So I guess the main question I am pondering is:
Cost of extra room+ bath over detached garage
Cost of bumping out some space in the main house.