Current through Register Vol. 56, No. 18, September 16, 2024
(a) Any addition to a building or structure
shall comply with the requirements of the Uniform Construction Code applicable
to new construction.
1. Any repair,
renovation, alteration or reconstruction work undertaken within an existing
building in connection with an addition shall comply with the requirements of
this subchapter.
(b) No
addition shall create or extend any non-conformity in the existing building to
which the addition is constructed with regard to accessibility, structural
strength, egress capacity, exit access travel distance or the capacity of
mechanical, plumbing, electrical or fire protection system provisions of the
basic requirements of this subcode.
(c) No addition shall increase the height of
an existing building beyond that permitted under the applicable provisions of
the building subcode for a new building of the same group. (Plan
review--Building, Fire. Inspection--Building)
(d) No addition shall increase the area of an
existing building beyond that permitted under the applicable provisions of the
building subcode unless a fire wall is provided in accordance with Section 706
of the building subcode.
1. Infilling of floor
openings, such as elevator and exit stair shafts, and the addition of
mezzanines and equipment penthouses shall be permitted as allowed by the
building subcode. (Plan review--Building, Fire. Inspection--
Building)
(e) Where an
addition increases or extends the size of a fire area beyond that which is
allowed by Section 903 of the building subcode, an automatic sprinkler system
shall be provided throughout the fire area unless the addition is separated
from the existing building by a fire barrier or horizontal assembly, or both,
having a fire resistance rating in accordance with Table 707.3.10 of the
building subcode; mixed occupancies shall use the highest applicable rating
from Table 707.3.10.
1. Exception: This
requirement shall not apply to increases to the floor area of the building of
less than five percent. (Fire)
(f) Whenever an addition is made to a
dwelling of Group R-3 or R-5, smoke alarms shall be installed in accordance
with the following:
1. If the cumulative area
of all floors of the addition(s) is 25 percent or more of the floor area of the
largest floor of the existing dwelling, smoke alarms complying with the
building subcode or one- and two-family dwelling subcode, as applicable, shall
be installed throughout the addition and the existing dwelling.
2. If the cumulative area of all floors of
the addition(s) is five percent or more, but less than 25 percent, of the floor
area of the largest floor of the existing dwelling, hardwired, interconnected
smoke alarms with battery back-up meeting the requirements of NFPA 72, except
as otherwise provided in the building or fire protection subcode or one- and
two-family dwelling subcode, as applicable, shall be installed and maintained
in each story in the dwelling unit, including basements. (Fire)
(g) All additions shall comply
with the requirements at Chapter 11 of the building subcode for accessibility,
where applicable.
1. The addition shall
include accessible entrance(s) unless the requirement that 60 percent of the
building entrances be accessible has been met in the existing building. (For
purposes of calculating the number of accessible entrances required, all
entrances in the existing building and planned for the addition shall be
included.)
i. If the only accessible entrance
to the addition is located in the existing building or facility, at least one
interior accessible route shall provide access through the existing building to
all rooms, elements, or spaces in the addition.
2. If there are no toilet rooms in the
addition, accessible toilet facilities that comply with Chapter 11 of the
building subcode shall be provided in the existing building.
(Building)
(h)
Structural loads: The following concern structural loads imposed by additions:
1. An addition shall not impose new loads
which would cause the existing building to be subject to stresses exceeding
those permitted by the building subcode.
2. An addition shall not increase the forces
in any structural element of the existing building or structure by more than
five percent, unless the increased forces on the element are still in
compliance with the building subcode for new structures.
3. An addition shall not decrease the
strength of any structural element of the existing building or structure unless
the element still exceeds the strength required by the building subcode for new
structures. (Building)
(i) When work is performed in a Class 1
structure or when work is performed on a smoke control system, a list of all
materials and work requiring special inspections, and a list of agencies,
qualified licensed professionals or firms intended to be retained for
conducting those inspections in accordance with the requirements of the
building subcode shall be submitted as part of the permit
application.
