Permits
ADU Fire Sprinkler Requirements in California: The 2026 Homeowner’s Guide
What if the decision to install fire sprinklers in your new ADU had nothing to do with the size of the unit, but everything to do with the house you already live in? For many California homeowners, the difference between a streamlined permit and a multi-thousand dollar plumbing surprise comes down to a single, often misunderstood regulation. It's frustrating to feel like the goalposts keep moving while you're just trying to add value to your property. You want clear answers, not a dense stack of building codes that seem to contradict each other.
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