About our data

How we sourced, verified, and rated 691+ Authority Having Jurisdiction (AHJ) records across 13 states — and where the limits are.

Coverage

As of June 2026, Building Signal Check™ covers 691 jurisdictions across 13 states:

• Full coverage (named AHJ records, code amendments tracked): Texas (260), Florida (127), California (81), Arizona (50), Oklahoma (50), Massachusetts (15, on 780 CMR §918 — a non-IFC state), North Carolina (15), Tennessee (15), Washington (15), Colorado (15), Illinois (14), New York (13), Georgia (13).
• General framework analysis only: all other US states. The tool will still return a code-level verdict based on the model IFC §510, but without jurisdiction-specific amendments.

Primary sources

• ICC Digital Codes — authoritative text of the International Fire Code (IFC) editions 2018, 2021, 2024.
• NFPA — NFPA 1 (2024), NFPA 72 (2025), NFPA 1221 (2019), NFPA 1225 (2022 / 2025), UL 2524.
• AHJ-published ordinances — adoption ordinances, fire prevention codes, local amendments published on official municipal or county websites.
• FCC — 47 CFR §90.219 (signal booster authorization) and frequency coordination guidance.
• Direct AHJ correspondence — email or phone confirmation from fire marshals, plan reviewers, or designated code officials.
• State statutes — e.g., Florida Statute §633.202(18), Texas Government Code Chapter 233.

Confidence methodology

Every AHJ record is tagged with one of five confidence levels. The verdict page displays the confidence for your specific AHJ.

How we rate verdicts

The verdict on the result page is the output of a rules engine that combines:

1. Trigger conditions from the IFC edition adopted by your AHJ (e.g., square footage thresholds, story counts, occupancy classifications, below-grade area).
2. Local amendments tracked in our database (e.g., the Cleburne 55-foot high-rise amendment, the Plano 12,000-sqft threshold, the San Antonio §510.2.1 needs-assessment provision).
3. Statutory overlays at the state level (e.g., Florida Statute §633.202(18)).
4. Construction era and type as a coarse signal for RF attenuation risk.

The output is one of three verdicts: likely in scope, edge case / consult AHJ, or likely out of scope. None of these is a code determination. All are starting points for a conversation with your AHJ.

Update cadence

• Quarterly — full sweep of the 260 Texas and 127 Florida AHJ records.
• Annually — secondary-state records (CA, AZ, OK, etc.).
• Continuously — corrections received via [email protected] or AHJ outreach are processed within 5 business days.

Known limitations

• Code adoption changes faster than our update cycle. A jurisdiction that adopted a new IFC edition within the past 90 days may not yet be reflected.
• Some AHJs do not publish their amendments. We rely on direct correspondence; gaps exist.
• Construction type and era are coarse signals. Site-specific RF behavior depends on many factors that no scoping tool can model — only a survey can measure them.
• The tool does not currently model fringe occupancies (R&D high-hazard, detention, military installations, federal buildings).
• Outside the 12 covered states, only model IFC §510 logic is applied.

Found an error?

Please email [email protected] with the jurisdiction, the specific code section, and your source. We respond within 5 business days and credit verified corrections.

Who built this

Building Signal Check™ is built and maintained by Zion Fire Protection, LLC. Lead architect: Joel Sadowsky — NICET Level III Fire Alarm, NICET Level III Special Hazards, NICET Level II Sprinkler, FCC GROL, 15+ years of fire-protection field experience.

Not an engineering report. Joel Sadowsky and Zion Fire Protection, LLC hold the licenses listed above. None of them substitute for a stamped engineering report. Where the IFC, NFPA, or local AHJ requires a PE-sealed design, only a licensed Professional Engineer can provide one.