ADU Rules in Santa Clarita.
Local ADU regulations, permit fees, setback requirements, and typical timelines for Santa Clarita. Last updated 2026-05-27.
Santa Clarita ADU Requirements
Attached ADU: up to 25 ft
Santa Clarita has limited transit; replacement parking generally required.
Design 4 weeks · Permit 6 weeks · Build 38 weeks
Plain-language summary
In Santa Clarita, a detached ADU requires a minimum 4-foot side setback and 4-foot rear setback. The maximum height for a detached ADU is 16 feet, while an attached ADU may be up to 25 feet. The maximum size for a detached ADU is 1,200 sq ft; a Junior ADU (JADU) is limited to 500 sq ft. Replacement parking is required for most projects. Typical permit fees range from $7,000 to $14,000. A typical project takes approximately ~11 months from design start to move-in, including 4 weeks of design, 6 weeks for permit review, and 38 weeks of construction.
⚠️ ADU rules change frequently. Always verify current requirements with the Santa Clarita Building & Safety Department before submitting plans. Official source →
What to Watch Out For
- Santa Clarita encompasses Valencia, Saugus, Canyon Country, Stevenson Ranch, and Newhall — all follow the same City rules.
- VHFHSZ applies to hillside areas throughout the city; fire-resistant construction required.
- HOAs are very common across all communities; CC&R approval is typically required before permit submittal.
- William S. Hart Union and Newhall School Districts assess school impact fees.
How Long Does It Take to Get an ADU Permit in Santa Clarita?
Site study, floor plans, elevations, structural drawings.
Plan check, corrections, and permit issuance by Santa Clarita Building & Safety.
Foundation, framing, MEP rough-in, finishes, final inspection.
A licensed engineer on your lot, free.
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
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