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Michelle pacheco0 found this helpful
License VerifiedADU O'SIDE
Serving Carlsbad, Escondido, Oceanside, Oxnard & more · Based in Oceanside, CA
Pricing on request — unlock ADU O'SIDE's ADU pricing for your project
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About ADU O'SIDE
ADU O'SIDE is a CSLB-verified contractor listed in San Diego County with classification B.
1+ years building ADUs · CSLB 1129042 · B - General Building Contractor
ADU O'SIDE ADU pricing
Pricing varies by unit type, size, finishes, and site conditions. Unlock ADU O'SIDE's project pricing for your lot — free, no obligation.
| Unit type | Typical size | Pricing |
|---|---|---|
| Studio / JADU | ≤ 500 sq ft | Pricing locked — unlock to view |
| 1-bedroom detached ADU | 600–750 sq ft | Pricing locked — unlock to view |
| 2-bedroom detached ADU | 750–1,000 sq ft | Pricing locked — unlock to view |
| Garage conversion | 400–600 sq ft | Pricing locked — unlock to view |
| Attached ADU | 400–800 sq ft | Pricing locked — unlock to view |
Pricing is unlocked per project
Share a few details and we'll send ADU O'SIDE's pricing for your build.
Services ADU O'SIDE offers
- Detached ADUs
- Attached ADUs
- Garage Conversions
- Junior ADUs (JADU)
- Permitting
What ADU O'SIDE handles
Design & permitting
In-house design and full permit handling.
- Architectural design & 3D renderings
- Structural & Title 24 energy plans
- City plan-check submittal & corrections
Construction
Turnkey ground-up and conversion builds.
- Foundation & framing
- Detached, attached & garage-conversion ADUs
- Electrical, plumbing & HVAC
Financing
Guidance and lender introductions.
- Renovation / construction-loan guidance
- HELOC & cash-out refinance referrals
- ADU-specific (after-build-value) lenders
Project types
ADU formats this builder takes on.
- Detached ADU
- Attached ADU
- Garage / ADU conversion
Warranty & support
What's covered after move-in.
- Workmanship warranty
- Manufacturer materials warranties
- Dedicated project manager
Reviews of ADU O'SIDE
5.03 reviews
Distribution
Verified
Colin has done a lot of projects at my house, including removing interior walls, installing a stove and chimney, installing a shower door, removing exterior windows and adding patio doors where there were just windows, and building a perfect retaining wall. His work is always carefully planned and executed. And he is honest and never tries to upsell additional projects or suggest "improvements" that you don't need or want. Highly recommended.
Joyce E0 found this helpful
Verified
Colllins work is the best. Love my new kitchen remodel
Christina M0 found this helpful
Frequently asked questions about ADU O'SIDE
What does ADU O'SIDE offer?
ADU O'SIDE is a full-service ADU builder serving Oceanside, CA, handling design, permitting, and turnkey construction for detached ADUs, attached ADUs, garage conversions, and junior ADUs (JADUs). ADU O'SIDE holds a 5.0-star rating across 3 verified homeowner reviews.
Is ADU O'SIDE licensed and insured?
Yes. ADU O'SIDE holds an active CSLB license (1129042), classified B - General Building Contractor, and is bonded and insured.
How much does ADU O'SIDE charge to build an ADU?
ADU O'SIDE prices every ADU per project — your cost depends on size, finishes, and site conditions. Garage conversions are the most affordable path; detached units cost more. Pricing is unlocked per project: request a quote to get ADU O'SIDE's exact, no-obligation estimate for your lot.
What areas does ADU O'SIDE serve?
ADU O'SIDE builds ADUs in Carlsbad, Escondido, Oceanside, Oxnard, San Diego County.
How long does ADU O'SIDE take to build an ADU?
Most ADU projects run 6–12 months end to end — roughly 1–2 months for design and permitting (California caps plan check at 60 days for compliant units) and 4–8 months of construction. ADU O'SIDE confirms a timeline for your specific project during the feasibility consultation.
How do I get a quote from ADU O'SIDE?
Tap any "Get a Quote" button on this page to share a few details about your property and project. We'll confirm your service area, match you directly with ADU O'SIDE, and set up your free feasibility consultation — no obligation.
Where ADU O'SIDE works
Oceanside, CAService-area map
Street View
- City Building & Safety
- Planning Department
- Permit Center
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Pre-ADU Checkup — $499 — Get finalized permits, a pre-ADU checklist, and an on-site feasibility visit. Homeowners save $1,000s by doing this before engaging a contractor.