Newhall’s older lots make it a practical place to add an ADU. Most Old Town properties have no HOA review, older detached garages are strong conversion candidates, and permits go through the City of Santa Clarita.
Santa Clarita’s Historic Core — Where Older Lots Make ADUs and Garage Conversions Especially Practical
Newhall traces back to 1876, when Henry Mayo Newhall purchased Rancho San Francisco and the Southern Pacific Railroad gave the valley its first real town center. Old Town Newhall’s Main Street still reflects that history — Spanish-style bungalows, early-20th-century houses, and converted commercial buildings on lots that tend to be smaller and older than what you’ll find in Valencia or Saugus.
Landmarks here include William S. Hart Regional Park, the 265-acre former ranch of silent film star William S. Hart, willed to Los Angeles County in 1946. Inside the park, Heritage Junction preserves the original Saugus Train Station (where Theodore Roosevelt stopped in 1903), the Newhall Ranch House, and the Mitchell Adobe School. Newhall is also home to the Pioneer Oil Refinery — the oldest surviving oil refinery in the world.
Why Newhall’s Older Lots Are Good ADU Candidates
Because Old Town Newhall predates modern HOA-planned development, most properties here have no HOA design review at all — one less approval stacked on top of the city’s process. The smaller, older garages and detached structures common in Newhall are frequently strong candidates for conversion ADUs rather than costlier new construction. And because many Newhall lots were platted before today’s larger-home standards, the standard 4-foot side and rear setbacks tend to be easier to meet even on tighter parcels.
Permitting and Parking in Newhall
Newhall is inside city limits, so ADU applications go through the City of Santa Clarita’s Planning Division under SCMC §17.57.040, with ministerial review and a 60-day state-mandated timeline for compliant projects. Old Town Newhall’s walkable, transit-adjacent lots near the Metrolink station are also a good real-world example of the state’s parking exemption: properties within a half-mile of a major transit stop can often skip the ADU parking requirement entirely.
Newhall ADU quick facts
| Permits | City of Santa Clarita (Planning, then Building & Safety) |
| HOA review | Uncommon in Old Town Newhall |
| Best fits | Garage conversions and small detached units on older lots |
| Parking | Often waived within a half-mile of the Newhall Metrolink station |
| Oak trees | Lots with oak trees need clearance from the city’s Urban Forestry Division |
| Rentals | 30 days minimum for any ADU in the city |
Which ADU types fit Newhall lots?
- Detached garages: a conversion ADU reuses the existing foundation, framing, and roof. A conversion can usually keep its existing setbacks, and state law doesn’t require replacement parking.
- Smaller backyards: a compact detached ADU, since the standard 4-foot side and rear setbacks are often workable.
- Inside the house: a Junior ADU of up to 500 square feet, when the yard has no room.
How does ADU permitting work in Newhall?
- Planning review. The City of Santa Clarita’s Planning Division reviews every ADU and JADU first. Its office is at 23920 Valencia Blvd, Suite 140. The city’s ADU handout lists the standards.
- Building & Safety plan check. After Planning clearance, plans go to the city’s Building & Safety Division for code review.
- Decision. A compliant ADU gets ministerial approval with no public hearing. State law requires a decision within 60 days of a complete application.
- Fees. Expect permit and plan check fees. New living space over 500 square feet generally also triggers school district fees.
Newhall ADU FAQs
Do I need HOA approval for an ADU in Old Town Newhall?
Usually not. Old Town Newhall predates HOA-planned development, so most properties have no HOA design review. Your ADU still needs City of Santa Clarita approval.
Can I convert my detached garage into an ADU in Newhall?
Usually, yes. Garage conversions are one of the most practical ADU options in Newhall. A conversion can generally keep the garage’s existing setbacks, and state law doesn’t require you to replace the parking it provided.
How long does ADU permit approval take in Newhall?
State law requires the City of Santa Clarita to approve or deny a complete, compliant ADU application within 60 days. Corrections to the plans restart parts of that review, so complete plans save time.
Thinking about a garage conversion or backyard ADU in Newhall? Contact Santa Clarita ADU or call (661) 486-8393 to get connected with a local ADU contractor.
Looking for a builder? See how we connect Newhall homeowners with a local ADU contractor.