Start from the site plan with every numbered home site and accessory structure, then check that the utilities, fire department access, hydrants, and site details on each sheet serve the same sites. AI can flag conflicts; the civil engineer, the fire department, and the authority having jurisdiction decide compliance.
What does NFPA 501A cover?
NFPA 501A is the Standard for Fire and Life Safety Criteria for Manufactured Home Installations, Sites, and Communities. NFPA’s page states that it provides fire safety requirements for the installation of manufactured homes and manufactured home sites, including accessory buildings, structures, and communities.
NFPA’s official NFPA 501A page identifies the 2025 edition as current when checked on October 10, 2026. Confirm the edition, local amendments, and project scope that actually govern the work. The publisher’s newest edition does not establish local adoption.
Home construction is regulated separately at the federal level, and recreational vehicle parks are covered in the NFPA 1194 guide. Fire department access and water supply also follow the NFPA 1 fire code guide or the local fire code. Record which documents the authority requires before comparing.
Gather the site plan and the utility sheets
Collect the overall site plan with numbered home sites, the grading and street plans, the water and fire hydrant plans, the gas distribution plans, the electrical site plans with service pedestals, the sanitary sewer plans, the home site detail sheets, the community building drawings, and the specifications.
Communities are often built in phases with sites renumbered between them. Upload the current overall plan with each phase so every site can be traced through the utility sheets.
Follow each home site through the sheets
| Review question | Sources to compare | Decision to record |
|---|---|---|
| Site numbering | Overall site plan, phase plans, utility plans | Confirm each home site has the same number and footprint on every sheet. |
| Fire department access | Street plans, site plan, fire access plan | Check that streets and turnarounds are drawn the same on the civil and fire access sheets. |
| Hydrants and water | Water plans, hydrant locations, site plan | Match the hydrants and water mains to the current site layout. |
| Gas and electrical service | Gas plans, electrical site plans, pedestal details | Find home sites whose gas or electrical service is missing or drawn differently between sheets. |
| Accessory structures | Site details, community building drawings, site plan | Ask the designer to confirm carports, sheds, and community buildings and that every source agrees. |
| Phasing | Phase plans, issue dates, utility plans | Identify utility sheets issued before the latest site layout. |
Fire service mains feeding hydrants are covered in the NFPA 24 guide, and gas piping in the NFPA 54 guide. The civil site checklist and residential projects raise related questions.
Example: added home sites outside the hydrant plan
Hypothetical example. A community’s second phase adds a row of home sites along a new street. The overall site plan and grading plans show the new sites, while the water and hydrant plan still ends at the first phase and the electrical site plan does not show pedestals for the new row.
The site plan adds home sites along a new street, but the water and hydrant plan ends at the first phase and the electrical site plan has no pedestals for the new row. Please confirm the water supply and electrical service for these sites and coordinate the utility sheets.
The civil and electrical engineers extend their plans to the new sites. Compliance is decided by the engineers, the fire department, and the authority having jurisdiction.
Review a manufactured home community with Groundbook
Upload the current project PDFs and relevant specifications to Groundbook. Identify the governing issues and add the applicable NFPA 501A reference from a copy you are licensed to use, where the license permits uploading it. State the edition, amendments, review area, and known exclusions in your instructions.
Compare the overall site plan, grading and street plans, water and hydrant plans, gas distribution plans, electrical site plans and pedestal details, sanitary plans, home site details, community building drawings, and specifications. Flag site numbering, access, hydrants, utilities, and accessory structures that differ between sources. Use the supplied NFPA 501A edition where applicable and cite both sources.
Groundbook links each potential finding to the sheets involved and the reference you uploaded.
Document review does not set separation distances, size water supply, or approve the community. Those decisions remain with the design team, the fire department, and the authority having jurisdiction.