Exterior Door Replacement: Title 24 Requirements
In the prescriptive alteration rules the 0.20 door U-factor is tied to added door area, so a same-opening swap is not named there. The new door still needs its rating label and a 0.3 cfm per square foot air leakage rating, and the performance method compares a replaced door with U-0.20.
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Which job is it
- Same opening, solid door. Section 150.2(b)1 sends the altered component to the mandatory Sections 110.0 to 110.9, which include the door label and leakage rules below.
- A new or wider opening. Section 150.2(b)1N requires alterations that add exterior door area to meet Section 150.1(c)5: an area-weighted U-factor of 0.20 or lower for swinging doors. A fire-protected door between garage and house is excepted.
- A door with a window in it. Under 25 percent glass it is an opaque door and the glass is ignored prescriptively. At 25 percent or more it is a glazed door, judged as a window; see French door replacement.
What every replaced door shows
Section 110.6(a) puts a temporary label on manufactured exterior doors showing U-factor, SHGC and VT, certifying air leakage of no more than 0.3 cfm per square foot at 75 pascals. Pet doors meet the same limit under ASTM E283. An unrated door takes a Table JA4.5.1 default: 0.50 for an insulated metal or 1-3/4 inch wood door, 0.60 for other wood, 0.70 for uninsulated double-layer metal and 1.45 for single-layer metal.
In a performance calculation
Table 150.2-G sets the standard design for a replaced door at U-0.20 with the existing door area. With third-party verification, a proposed door better than 0.20 is instead compared with the existing door's verified U-factor. A 0.50 default door therefore loses credit against a 0.20 baseline, which is the case for choosing a rated door.
Garage doors
A roll-up garage door counts as a door under Section 100.1, but Section 150.1(c)5 speaks only of swinging doors. A swinging door from the garage into a conditioned room is the fire-protected exception above.
The inspector verifies weatherstripping on exterior doors at final. The new-home 0.20 rule and defaults are set out on exterior doors and Title 24; patio sliders are on sliding glass door replacement. The residential reports cover alterations.
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
Section 150.2(b)1N applies the 0.20 limit to added exterior door area. A same-opening replacement is not named, but the door still needs its label and leakage rating.
Only if glass is 25 percent or more of the door. Below that it is an opaque door, and the glass is ignored in the prescriptive approach.
Explore Windows and Doors
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