The 2009 IRC states:
R314.3.1 Alterations, repairs and additions. When alterations,
repairs or additions requiring a permit occur, or when
one or more sleeping rooms are added or created in existing
dwellings, the individual dwelling unit shall be equipped with
smoke alarms located as required for new dwellings.
1. Work involving the exterior surfaces of dwellings,
such as the replacement of roofing or siding, or the
addition or replacement of windows or doors, or the
addition of a porch or deck, are exempt from the
requirements of this section.
2. Installation, alteration or repairs of plumbing or
mechanical systems are exempt from the requirements
of this section.
The requirement of a permit kicks in the requirement of CM alarms if the existing structure has an attached garage OR has fuel fired appliances and SD's.
SO this small addition of a sun room that started out with just one circuit for lights and outlets now requires installation of hardwired SD's to current code, one inside every bedroom and centrally located outside of the bedrooms, PLUS CM alarms in the vicinity of the bedrooms.
Now the question. On exception 1 would you require SD per the code AND CM alarms when a Sun Room is being constructed?
We are saying yes....It is an enclosed addition with windows and doors.