First hope this is the right place for this question. I'm building an addition to my house that's essentially a new wing -- full but unfinished basement; 1st story with mudroom/laundry/full bath; second story with master bedroom. they're telling me I need to retro-fit hard-wired smokes to the old part of the house, not just in the new spaces. I'm in Bergen county, New Jersey and acting as my own contractor.