(Relative to residential installations...the reason why this came up is that I recently saw literature for "BRK Electronics" smoke alarms that states a maximum of 12 alarms can be interconnected. Further research indicated that the UL imposed this limit.)

Has anyone ever had a situation where more than 12 alarms are needed?

To keep this as simple as possible, let's use an example house without getting into attics, basements, etc.

Bedrooms - 1 alarm per room = 5 alarms
Living Room = 1 alarm
Dining Room = 1 alarm
Den = 1 alarm
Top of staircases = 3 alarms
Hallways = 3 alarms

Again, this is just an example, so there may be locations where an alarm should be, or locations where an alarm should not be due to false alarms.

According to this example, there are 14 alarms.

From what I understand, according to various codes, all new-construction houses must have interconnected alarms.

How does one handle such a situation?