Hi There - First time post here but hope its an easy one. Working on a project where our client wants to add a multi family dwelling to an existing single family (400 SF). Below are my understandings of our options. We have to add sprinklers to the project since the code (CBC) requires all new residential to have sprinklers.
- My understanding is attaching to the existing would change the occupancy of the structure from R3 to R2 as we would have more the 2 dwelling units in one structure. This would mean making the single family comply with R2 requirements. This would add construction cost as we think we would have to add sprinklers to the existing single family.
- Our other option is to add a fire wall between the two structures. The existing structure is 1 story and the new is 3 stories. Would our openings not be be limited on the second and third floor since it no longer shares the wall with the existing structure?