Caldwell, ID Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- Single/two-family sprinklers
- IRC R313.2 mandate deleted entirely
- Townhouse alternative
- Rated walls substitute for sprinklers
- Governing section
- Caldwell City Code § 12-01-21
- Existing townhouses
- No retrofit if never sprinklered
- Garage separation
- 5/8-inch type X gypsum required
Summary
Caldwell struck the IRC's one- and two-family automatic fire sprinkler mandate entirely and softened the townhouse rule. Under City Code § 12-01-21, single-family and duplex homes carry no local sprinkler requirement, and townhouses can satisfy the fire-separation rule with rated walls instead of a sprinkler system.
Delete the exception contained under IRC section R313.1, "Townhouse Automatic Fire Sprinkler Systems" and replace with the following: Exception: Automatic residential fire sprinkler systems shall not be required in townhouses where either two (2) one (1)-hour fire-resistance-rated walls or a common two (2)-hour fire-resistance rated wall, as specified in item number 2 of Section R302.2.2 is installed between dwelling units or when additions or alterations are made to existing townhouses that do not have an automatic residential fire sprinkler system installed. Delete IRC section R313.2. One- and two-family dwellings automatic fire sprinkler systems.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 Code: Local legislation current through Ordinance 3747, passed 3-16-2026).
Full Breakdown
When Caldwell adopted the 2018 International Residential Code with local amendments at § 12-01-21, it made a deliberate choice on residential fire sprinklers. 2, "One- and two-family dwellings automatic fire sprinkler systems," in its entirety, meaning the model code's mandate for sprinklers in new single-family and duplex construction does not apply inside Caldwell. 2, between dwelling units. That same substituted exception also covers additions or alterations made to an existing townhouse that never had a sprinkler system installed, so a remodel does not retroactively trigger a sprinkler retrofit.
13. Builders should read § 12-01-21 as a whole rather than assuming any single IRC fire provision applies unmodified, since the city has revised or removed several of them.
Violations & Fines
Constructing a new one- or two-family dwelling or a townhouse that fails to meet the substituted fire-separation exception, garage separation rule, or other fire-and-life-safety amendments in § 12-01-21 is enforced through Caldwell's general building permit and inspection process, with violations prosecuted as misdemeanors under § 01-01-05 and fines capped at Idaho Code § 50-302.
Frequently Asked Questions
Does Caldwell require fire sprinklers in new single-family homes?
How do townhouses satisfy the fire-separation rule instead of sprinklers?
If I remodel an older townhouse, do I have to add sprinklers?
Sources & Official References
Other rules in Caldwell
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