On Mon, 27 Mar 2017 23:58:54 -0000 (UTC), Doug Miller
wrote:

trader_4 wrote in news:9fcff8f8-fe61-4543-9a3a-
:

IDK. But smoke detectors are not necessarily required to be in the
actual bedroom.

No; in fact, they should *not* be in the bedroom unless there is an expected source of ignition
in the bedroom (e.g. an idiot who habitually smokes in bed).

Smoke detectors should always be *outside* the bedrooms: if a fire arises elsewhere in the
house, by the time a detector *inside* the bedroom alerts to the smoke, at best, precious time
has been lost -- and at worst, the sleepers are already dead of smoke inhalation.

That is why they are supposed to be interconnected. If you are really
doing this right, the smoke going off anywhere will set off all of the
bedroom smokes.
Prior to the interconnection rule, the smoke was required to be in the
hall outside the sleeping rooms ... and it still is.
Now you need a smoke in each sleeping room, one outside the sleeping
rooms and at least one on every other floor.
This will be triggered if a permit is pulled for any other renovation
and the only exceptions are if you can't do it any other way but
opening up drywall you were not going to be in anyway.
This is defined in ICC building code R.314 which is derived from NFPA
72. These codes tend to be adopted by states as their own.