License VerifiedOneStop ADU
Serving San Diego, Chula Vista, San Diego County · Based in San Diego, CA
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Pricing on request — unlock OneStop ADU's ADU pricing for your project
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About OneStop ADU
OneStop ADU is a CSLB-verified contractor listed in San Diego County with classification B.
3+ years building ADUs · CSLB 1094838 · B - General Building Contractor
OneStop ADU ADU pricing
Pricing varies by unit type, size, finishes, and site conditions. Unlock OneStop ADU'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 OneStop ADU's pricing for your build.
Services OneStop ADU offers
- Detached ADUs
- Attached ADUs
- Garage Conversions
- Junior ADUs (JADU)
- Permitting
What OneStop ADU 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
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Frequently asked questions about OneStop ADU
What does OneStop ADU offer?
OneStop ADU is a full-service ADU builder serving San Diego, CA, handling design, permitting, and turnkey construction for detached ADUs, attached ADUs, garage conversions, and junior ADUs (JADUs). OneStop ADU is a vetted, license-verified ADU builder in our directory.
Is OneStop ADU licensed and insured?
Yes. OneStop ADU holds an active CSLB license (1094838), classified B - General Building Contractor, and is bonded and insured.
How much does OneStop ADU charge to build an ADU?
OneStop ADU 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 OneStop ADU's exact, no-obligation estimate for your lot.
What areas does OneStop ADU serve?
OneStop ADU builds ADUs in San Diego, Chula Vista, San Diego County.
How long does OneStop ADU 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. OneStop ADU confirms a timeline for your specific project during the feasibility consultation.
How do I get a quote from OneStop ADU?
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 OneStop ADU, and set up your free feasibility consultation — no obligation.
Where OneStop ADU works
- City Building & Safety
- Planning Department
- Permit Center
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.