Verified
Good quality homes and great people. Would recommend!!
Sydney Chen0 found this helpful
License VerifiedJNC Construction
Serving San Bernardino, Rancho Cucamonga, San Bernardino County · Based in San Bernardino, CA
Pricing on request — unlock JNC Construction's ADU pricing for your project
Watch the JNC Construction tour
Project gallery
About JNC Construction
JNC Construction is a CSLB-verified contractor listed in San Bernardino County with classification B.
6+ years building ADUs · CSLB 1059165 · B - General Building Contractor
JNC Construction ADU pricing
Pricing varies by unit type, size, finishes, and site conditions. Unlock JNC Construction'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 JNC Construction's pricing for your build.
Services JNC Construction offers
- Detached ADUs
- Attached ADUs
- Garage Conversions
- Junior ADUs (JADU)
- Permitting
What JNC Construction 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 JNC Construction
5.0173 reviews
Verified
Great people. These guys are super nice and have good quality homes
Serg Etse0 found this helpful
Verified
This company is the best for home building in the area for sure. Highly recommend
Dom Bust0 found this helpful
Verified
best homes building in the area. high quality
Eric Hernandez0 found this helpful
Verified
Ive seen first hand how JNC Construction conducts themselves and have been nothing but hardworking, reliable, and honest. Their professionalism and integrity really stand out. The work alone speaks for itself. I recommend them confidently.
Kara Giandomenico0 found this helpful
Frequently asked questions about JNC Construction
What does JNC Construction offer?
JNC Construction is a full-service ADU builder serving San Bernardino, CA, handling design, permitting, and turnkey construction for detached ADUs, attached ADUs, garage conversions, and junior ADUs (JADUs). JNC Construction holds a 5.0-star rating across 173 verified homeowner reviews.
Is JNC Construction licensed and insured?
Yes. JNC Construction holds an active CSLB license (1059165), classified B - General Building Contractor, and is bonded and insured.
How much does JNC Construction charge to build an ADU?
JNC Construction 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 JNC Construction's exact, no-obligation estimate for your lot.
What areas does JNC Construction serve?
JNC Construction builds ADUs in San Bernardino, Rancho Cucamonga, San Bernardino County.
How long does JNC Construction 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. JNC Construction confirms a timeline for your specific project during the feasibility consultation.
How do I get a quote from JNC Construction?
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 JNC Construction, and set up your free feasibility consultation — no obligation.
Where JNC Construction works
San Bernardino, CAService-area map
Street View
- City Building & Safety
- Planning Department
- Permit Center
Other ADU builders near San Bernardino, CA
Other home services in San Bernardino
Home remodeling in San BernardinoKitchen remodeling in San BernardinoBathroom remodeling in San BernardinoRoom additions in San BernardinoRoofing in San BernardinoSolar installation in San BernardinoLandscaping in San BernardinoFoundation repair in San Bernardino
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.