Adu Construction Placer County, CA

ADU construction, design, and permits in Placer County. Detached cottages, conversions, and full custom build services.

Custom Home Building & ADU Expertise

ADU Construction in Placer County, CA

In Placer County, we design and build custom ADUs that fit your lifestyle. Whether you need rental income, a guest cottage, or space for aging parents, our team handles permits, design, and construction. We bring 30+ years of home building experience to every project—from the foothills near Auburn to Roseville and beyond.

How We Work

We manage your ADU project from design through final inspection. Our process is transparent and collaborative—you always know what's happening next.

What's Involved

1

Site Assessment

We evaluate your lot, zoning, utilities, and local codes to confirm what's possible. This step prevents costly surprises later.

2

Design & Planning

We develop floor plans that match your needs and respect Placer County setback and height rules. You review and approve before we submit.

3

Permits & Approval

We handle all permit applications and coordinate with building departments. Placer County approves applications within 60 days of submittal.

4

Construction

Once permitted, we start framing, electrical, plumbing, and finish work. You receive regular updates and can walk the site.

5

Inspection & Close

We coordinate all required inspections with Placer County building officials. Final walk-through confirms everything meets code.

6

Certificate of Occupancy

You receive your final C.O. and can occupy or lease the unit. We provide all permits and documentation for your records.

You'll always know what's happening next—and when.

Our Services

We offer full-service ADU solutions tailored to Placer County properties, from lot analysis through move-in.

Detached Backyard Cottages

Detached backyard cottage ADU

New detached cottage in Loomis with wood siding and private entrance.

A detached ADU sits independently on your property—perfect for rental income or multi-generational living in Placer County. State law allows up to 1,200 square feet for detached units. These cottages maximize property value while respecting setback rules in areas like Rocklin and Auburn.

  • Full kitchen, bedroom, and bathroom
  • Independent metering for utilities
  • Separate entrance with parking

Attached or Converted ADUs

Garage converted to ADU

Garage conversion to ADU in Roseville with new egress and full utilities.

Convert an existing garage, basement, attic, or add a unit to your primary residence. Placer County allows attached ADUs within existing structures without triggering new fire sprinkler requirements for the main house—saving money and complexity.

  • Reuses existing structure and utilities
  • Typically 500–850 square feet
  • Fast approval and lower construction costs

Design & Permit Support

ADU floor plans and permit drawings

Custom floor plans and permit-ready drawings for Placer County review.

We prepare detailed plans that comply with California Building Code and Placer County setback, height, and lot coverage rules. Our architects work with local planners to streamline approval—no surprises at permit review.

  • Site plans and utility layouts
  • Energy compliance (Title 24) documentation
  • Coordination with City of Roseville, Auburn, or Rocklin building departments

Why It Matters

ADU construction strengthens your property and addresses real housing needs—here's what sets our approach apart.

Build Long-Term Property Value

Properties with ADUs in Placer County command higher resale prices. Buyers increasingly seek flexible living options—multigenerational homes, rental income, or guest space. A well-built ADU adds both immediate utility and lasting equity to your property.

California Law Is On Your Side

State ADU laws eliminate many old barriers. HOAs cannot prohibit ADUs. Cities must approve qualifying applications within 60 days. Lot coverage and minimum lot size restrictions do not apply. Our 30+ years in custom home building means we navigate these rules with confidence—protecting your project from costly delays.

Quality Without Compromise

We build ADUs to the same structural and finish standards as our primary homes. Every electrical system, plumbing line, and framing detail meets or exceeds code. Your ADU will last decades and perform reliably whether rented or occupied by family.

Serving Placer County and Surrounding Areas

We've built homes and ADUs across Placer County for three decades. Local knowledge matters.

From the Valley to the Sierra

We service properties in Roseville, Rocklin, Lincoln, Loomis, Auburn, Colfax, and the unincorporated foothills. Each area has distinct zoning rules and building department cultures. We know exactly what each jurisdiction requires—and what questions to ask early to avoid delays.

Hillside sites in the foothills near Rocklin or Loomis demand foundation and erosion expertise. Valley properties in Roseville require careful drainage and utility coordination. We handle both with the same precision and care.

Frequently Asked Questions

Common questions about ADU construction in Placer County.

Can I build an ADU on my property in Placer County?

Most single-family residential lots in Placer County allow one ADU under state law. We evaluate your specific parcel for zoning, setbacks, lot size, and utilities to confirm feasibility at no charge.

What is the maximum size for an ADU in Placer County?

Detached ADUs can be up to 1,200 square feet. Attached ADUs converted from existing structures have fewer size limits. Attached ADUs added to a primary residence can reach 850 square feet for studios or one-bedroom, and 1,000 square feet for two or more bedrooms. State law caps ADU size at 50% of the primary residence, whichever is smaller.

Does building an ADU require approvals from my HOA?

No. California state law prohibits HOAs from blocking or unreasonably restricting ADU construction on single-family lots. HOAs may enforce covenants on design details, but cannot deny the ADU itself. Your local city or county handles ministerial approval.

How long does the permit approval process take?

Placer County and its cities must review ADU applications within 60 days of a complete submittal. If your plans use preapproved designs, approval can happen even faster. Our team ensures all documents are complete to meet this timeline.

Can I rent my ADU, or must I live there?

California law allows rental ADUs with no owner-occupancy requirement. You can build the ADU and lease both it and your primary home if you choose. This flexibility attracts investors and multigenerational families alike.

Do I need off-street parking for my ADU?

State law eliminates parking requirements for ADUs in most situations, especially if your property is near public transit. Placer County does not require replacement parking when a garage is converted to an ADU. We confirm local rules during the site assessment.

What Types of ADUs Are Right for Placer County?

ADUs serve different needs. A detached backyard cottage works best on larger lots with room for setbacks. Garage conversions fit tight urban lots in Roseville or Rocklin. Attached units added to your primary home leverage existing utilities and are often quicker to build. We recommend the type that fits your lot, budget, and lifestyle. Most homeowners choose detached units for privacy and rental appeal—but the right choice depends on your property and goals.

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proudly serving these areas

  • Placer County, CA

  • Sacramento County, CA

  • El Dorado County, CA

  • Yuba County, CA

  • San Mateo County, CA

  • Nevada County, CA

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