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Idaho Falls, ID Building Safety: Fire Sprinkler Requirements (2026)

Few Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

Key Facts

1-2 family sprinklers
Not required (R313.2 deleted)
Townhouse exception
Fire-rated walls waive sprinklers
Code section
Section 7-6-2(K), (L)
National code default
IRC normally requires them

Summary

Idaho Falls deletes the Residential Code's automatic fire-sprinkler mandate for new one- and two-family homes, and narrows the townhouse sprinkler rule to units lacking qualifying fire-rated walls.

(K) ...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...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. (L) Delete Section R313.2 One-and two-family dwellings automatic fire sprinkler systems.

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Full Breakdown

City Code Section 7-6-2(L) deletes IRC Section R313.2 outright, so Idaho Falls does not require automatic fire sprinklers in new one- and two-family dwellings, unlike the unamended national code. Section 7-6-2(K) similarly rewrites the townhouse sprinkler exception: sprinklers are not required in townhouses separated by two one-hour fire-resistance-rated walls or one shared two-hour fire-resistance-rated wall, or in additions and alterations to existing sprinkler-free townhouses. Sprinklers may still be required elsewhere in the Code for multi-family or commercial buildings under the adopted IBC.

Violations & Fines

Because the mandate is deleted, there is no local sprinkler-installation violation for a qualifying one- or two-family home; noncompliant townhouse fire-wall construction can still draw a building-code correction notice.

Frequently Asked Questions

Does Idaho Falls require sprinklers in new single-family homes?
No. City Code Section 7-6-2(L) deletes the IRC's automatic residential fire-sprinkler mandate for one- and two-family dwellings.
What about townhouses?
Sprinklers are not required if the units share qualifying one-hour or two-hour fire-resistance-rated walls, per Section 7-6-2(K).

Sources & Official References

Other rules in Idaho Falls

Parking Rules: Overnight ParkingSome RestrictionsParking Rules: Street Parking LimitsSome RestrictionsBuilding PermitsSome RestrictionsElectrical PermitsSome RestrictionsPlumbing PermitsSome RestrictionsNoise Ordinances: Vehicle NoiseSome RestrictionsParking Rules: Towing & Impound RightsLight RestrictionsParking Rules: Commercial & Oversized VehiclesSome RestrictionsParking Rules: Snow Removal Parking RulesSome Restrictions

All Idaho Falls rules

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