Build an ADU in Castaic—smart space with a clear process

Make It

Adding an accessory dwelling unit in Castaic creates flexible space for multigenerational living, long-term rental, or a quiet studio—often on larger north-county parcels with driveway access and hillside views. MF ADU delivers pre-engineered, permit-ready models and a managed path from feasibility to installation, tailored to Castaic’s mix of cul-de-sacs, sloped lots, and occasional septic service.

Why Castaic homeowners choose MF ADU

  • Footprints that preserve yard space, parking, and privacy from the main home

  • Transparent pricing with documented inclusions and site-work allowances

  • Done-with-you process from feasibility and selections through installation

  • Durable, low-maintenance finishes suited to everyday family use or rentals

  • Utility planning for longer runs, potential panel upgrades, and septic tie-ins where applicable Popular fits for Castaic lots

  • Studios & 1-bed ADUs – Ideal for guest suites, home offices, or caregiver space with minimal yard impact.

  • 2-bed ADUs – Common on deeper parcels; support multigenerational living while keeping outdoor areas usable.

  • Drive-aisle & rear-yard placements – Window/door positions tuned for privacy; layouts planned for longer utility routes.

Make It

Castaic permitting at a glance

ADUs are allowed on most single-family and many multifamily parcels (site-specific). Typical considerations include setbacks, height, lot coverage, utility locations, parking, and (where present) septic capacity. Parcels in Hillside or WUI (wildland-urban interface) areas may have added requirements; some neighborhoods include HOAs/CC&Rs that control exterior appearance. Our feasibility review checks parcel data, overlays, utilities/septic, and maps the cleanest path to approvals. (General info; final eligibility depends on your parcel and current rules.)

What the process looks like

  1. Feasibility & Fit – Review parcel, access, slope, utilities/septic, and best-fit model.

  2. Selections & Scope – Confirm finishes, options, and site-work assumptions; align foundation and utility plan.

  3. Permits & Approvals – Prepare a permit-ready package and coordinate with the city/county and any HOA.

  4. Site Work & Installation – Foundation, trenching, delivery/assembly, interior finish, inspections.

  5. Handover – Walkthrough, documentation, and guidance for rental or guest use.

Make It

Pricing & timelines

Total cost depends on model size, foundation type, distance to utilities, panel capacity, access logistics, and any hillside/WUI or septic requirements. After feasibility we provide a site-specific estimate and milestone schedule.

Did you know?

Many Castaic properties can accommodate a detached ADU with its own patio and entry—creating truly separate living space for family or tenants while keeping the main home’s curb appeal intact.

Nearby areas we serve

Val Verde • Stevenson Ranch • Valencia • Saugus • Canyon Country • Santa Clarita

Start your Castaic ADU

Ready to add flexible space or a long-term rental? Contact us to get a feasibility review and a clear plan for your property.

FAQs — Castaic

  • Often no when near transit or when replacing existing spaces, but it’s parcel-specific. We confirm during feasibility.

  • Timelines vary by model, permits, and site work. After feasibility, we provide a step-by-step schedule.

  • Yes—many homeowners use ADUs for long-term rentals or family housing. We outline best practices and local rules during handover.

  • Panel capacity checks, longer trenching distances typical of larger lots, and sewer or septic tie-ins. We include these in your scope.

  • Feasibility identifies added steps—such as fire access, defensible space, grading details, or HOA design review—and whether your parcel can proceed.