2025 NFPA 13D Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes

NFPA 13D, Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes 2025 edition establishes mandatory requirements for the design, installation, and testing of fire sprinkler systems in one- and two-family dwellings, manufactured homes, and townhouses. Coverage addresses sprinkler system design criteria, water supplies, equipment specifications, and sprinkler placement — with provisions tailored to allow cost-effective residential sprinkler system installation across different construction types and the latest available technologies. The 2025 edition introduces updates to sprinkler placement criteria, heat source differentiation, and inspection task guidance.

Who Uses NFPA 13D

Required by fire protection engineers, residential sprinkler system installers and contractors, building inspectors, and AHJ officials responsible for the design, installation, and acceptance of sprinkler systems in one- and two-family residential occupancies and manufactured housing.

What's New in the 2025 Edition

The 2025 edition delivers targeted updates across system design, sprinkler placement, and inspection requirements, including:

• Revised conversion factors in Chapter 1.
• New definition for "ceiling pocket."
• New differentiation between LED-style lights and other light types as heat sources for sprinkler placement purposes.
• New guidance on installing sidewall sprinklers beneath sloped ceilings.
• Clarification on sprinkler requirements for closets with no doors.
• New location criteria for sprinkler installation above fuel-fired equipment.
• Added pipe sizing calculation worksheet.
• Updated Chapter 12 annex identifying additional tasks to be performed during inspections.

Stay compliant with the residential sprinkler system installation requirements in effect for your jurisdiction.

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