Primary Bedroom Addition Title 24 Requirements
A primary bedroom addition is judged on its suite. The ensuite needs a 50 cfm demand-controlled fan or a 20 cfm continuous fan, the bathroom and any walk-in closet each need an automatic-off lighting sensor, and electric baseboard heat in place of extended ducts works only on the performance route.
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The ensuite fan
Local exhaust applies to additions under Section 150.2(a)1Cii, and a window is not an exception for a bathroom. Choose a demand-controlled fan at 50 cfm, with an accessible on-off control or an automatic control that does not block occupant control, or a continuous fan at 20 cfm with a manual control. Sound limits are 3.0 sones for demand-controlled and 1.0 for continuous. The installer measures airflow with a flow hood or builds to Table 150.0-H, which allows a 4 inch duct at 50 cfm on a run of 25 feet or less with no more than three elbows.
Lights in the bedroom, bath and closet
- At least one luminaire in the bathroom, and one in a walk-in closet, must be on an occupancy or vacancy sensor with automatic-off.
- Bedroom lighting needs readily accessible dimming controls, and a forward phase-cut dimmer on LEDs must meet NEMA SSL 7A.
- Ceiling cans take no screw-base sockets and carry an airtight label of under 2.0 cfm at 75 pascals.
- Blank electrical boxes more than 5 feet above the floor cannot outnumber the bedrooms and must sit on a dimmer, vacancy sensor, low-voltage wiring or fan speed control.
How heat reaches the room
Example 9-36 covers an existing electric furnace: ducts extended any length are allowed, provided the furnace has the heating capacity CRC 303.10 requires and the extended system passes the sealing test. Example 9-37 covers a gas furnace and a wish for electric resistance baseboard in the new room: not prescriptively, only by performance compliance with other features in the addition or an accompanying alteration making up the energy. The wider rule is on electric baseboard heaters.
The bedroom count
The bedroom count enters Equation 150.0-B, but whole-dwelling ventilation applies only above 1,000 square feet. An addition-alone model needs just the existing floor area and bedroom count, so state the new count and make the plans agree.
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Common Title 24 Questions
- When is Title 24 required for a home?
- Does a remodel need Title 24?
- Does a room addition need Title 24?
- What plans are needed for a residential Title 24 report?
- How much does a residential Title 24 report cost?
- How long does a residential Title 24 report take?
Frequently Asked Questions
Yes. Section 150.0(o)1G requires local mechanical exhaust in each bathroom, and Section 150.2(a)1Cii applies it to additions. A window does not replace the fan.
It changes the bedroom count used for ventilation sizing, which matters only above 1,000 square feet, and it raises the number of blank electrical boxes allowed high on the wall.
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