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Custom ADUs & JADUs in San Luis Obispo County

Smart additions for family, guests, or rental income—built to local code.

OUR PROCESS:

Every project starts with a conversation. Whether you reach out via phone, email, or referral, we take the time to understand your vision and ensure we’re a good fit from the beginning.

1. Intake

Next, we send a brief questionnaire to learn more about your goals, style, timeline, and expectations—helping us prepare for a focused consultation.

2. Questionnaire

We meet to review your ideas, sketches, or plans, evaluate the site, and discuss your goals. You’ll receive an early cost range based on the project scope.

3. In-Person Consultation

Next is to sign a Pre-Construction Agreement (PCA)— this crucial step ensures your project is accurately planned, thoroughly estimated, and set up for success. The PCA allows us to invest time and expertise into your project before construction begins, so you can move forward with confidence—knowing the scope, budget, and design are fully aligned. 

4. PCA

During this phase, we finalize layout details, refine material selections, and coordinate with our trusted network of suppliers and trade partners. We’ll also collaborate on design elements, permitting needs, and timeline expectations. Your custom estimate will include a comprehensive scope of work, budget, and material specs. Our shared goal is to finalize a plan that’s thoughtful, clear, and ready to build.

5. Planning & Estimating

Once your final estimate is approved, we’ll present the Construction Contract for mutual signature. This agreement outlines the total project cost, payment schedule, and key construction details. We’ll review it together for clarity and alignment. 

6. Construction Contract 

After signing the construction contract, we’ll invoice you for the initial construction deposit. We then confirm city permits, engage with trade partners, vendors, and craftsmen, and source products tailored to your project. A construction schedule will be established based on deposits and selected products from the Pre-Construction Agreement. 

7. Coordinating the Build 

This is where the magic happens. We’ll stay in close communication—offering weekly progress updates if you’d like—and make sure you’re never left guessing. Adam remains hands-on in the field, ensuring quality craftsmanship and problem-solving along the way. We aim to make the experience efficient, positive, and minimally disruptive to your day-to-day life.

8. Building your Dream 

If changes are needed, we’ll issue a Change Order outlining the impact on cost, timeline, and coordination. You’ll always know what to expect—no surprises.

9. In-Process Changes 

We conduct a full walkthrough with you, testing systems and addressing any punch list items. You’ll receive a full clean up, final documentation, a one-year craftsmanship warranty, and post check-ins at three and eleven months.

10. Project Hand Over 

What we build

Hall Builders Inc. designs and builds accessory dwelling units (ADUs) and junior accessory dwelling units (JADUs) for homeowners across San Luis Obispo County.

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Detached ADUs — freestanding backyard or side-yard units with full living, sleeping, cooking, and bathing.

Attached ADUs  additions that connect to the primary home while remaining a separate dwelling.

Garage ADUs — converting an existing garage into a permitted accessory dwelling; see /garage-conversions.

JADUs — compact units created within the existing walls of a single-family home.

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Every project is site-specific: lot size, utilities, access, coastal vs. inland rules, and your goals for privacy, parking, and use all shape the plan.

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SLO County permitting overview (not legal advice)

California and San Luis Obispo County (and each city) have specific pathways for ADUs and JADUs. Requirements differ for unincorporated county land versus cities such as San Luis Obispo, Atascadero, Paso Robles, and the coastal communities we serve.

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At a high level, homeowners should expect:

1. Confirm zoning, setbacks, height, unit size, and coastal vs. inland status.

2. Address utilities and site constraints—water, wastewater/septic, fire access, and parking.

3. Complete required planning and building steps; cities have their own packets and review timelines.

4. Build to approved plans through inspections and final occupancy.

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This is general information—not legal advice. Verify official requirements with the County or your city building department.

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Timeline & process with Hall Builders

1. Conversation & fit — goals, budget range, site photos or address, and timeline.

2. Site review & early range — what the lot and jurisdiction will realistically support.

3. Pre-construction agreement — planning, estimating, and design coordination before you commit to a full build contract.

4. Plans, permitting & estimate — layout, selections, trade coordination, and a detailed scope of work.

5. Construction contract & build — schedule, deposits, weekly communication as preferred, and Adam hands-on in the field.

6. Walkthrough & handover — punch list, cleanup, documentation, and craftsmanship warranty follow-up.

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Why Hall Builders Inc.

Local GC focus across San Luis Obispo County; licensed California general building contractor (B) and C-36 plumbing, CA License #1048518. Clear process, written scopes, change orders when needed, and family-owned accountability from first call through handover.

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Garage ADU & JADU path

If your best option is converting an existing garage—or creating a JADU inside the primary home—we help you choose the right path. See /garage-conversions for garage conversion details.

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Areas we serve

Atascadero, San Luis Obispo, Paso Robles, Pismo Beach, Morro Bay, Santa Margarita, Avila Beach, Cayucos, and surrounding San Luis Obispo County communities.

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Ready to explore an ADU or JADU? Call 805-423-4731 or contact us at /buildwithus.

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