ADU & Garage Conversion in Northridge, CA
Add living space, generate rental income, and increase your property value — all without buying a new home. GN Builders specializes in ADU construction and garage conversions in Northridge, CA, serving homeowners across the San Fernando Valley and Los Angeles County. We handle everything from permits to final inspection, so you can sit back while your investment grows.
Call us for a free estimate: (323) 372-7272
What Is an ADU?
An Accessory Dwelling Unit (ADU) is a secondary residential unit built on the same property as your primary home. In California, ADUs are one of the smartest investments a homeowner can make — they generate monthly rental income, house family members, and significantly increase property value.
California state law has made it easier than ever to build an ADU in Los Angeles County. Many permits are now streamlined, and in some cases, garage conversions can be approved in as little as 60 days.
ADU & Garage Conversion Services We Offer
GN Builders offers a full range of ADU and conversion services:
– Garage conversion to living space (bedroom, studio, 1-bed/1-bath unit)
– Detached ADU construction (new build in backyard)
– Attached ADU addition to existing home
– Junior ADU (JADU) — conversion within existing home footprint
– Two-story ADU construction
– ADU with separate entrance, kitchen, and bathroom
– Permit-ready ADU design and drawings
– Foundation, framing, plumbing, electrical, HVAC
– Interior finishing — flooring, cabinets, appliances, painting
Why Choose GN Builders for Your ADU Project?
Building an ADU is a complex project that requires experience with Los Angeles County permitting, construction codes, and utility connections. GN Builders has the expertise to handle it all:
🔸Licensed & Bonded — California Contractors State License Board, Lic #1134674
🔸 Full Permit Management — we prepare all drawings, submit permits, and coordinate city inspections
🔸 Design-Build Approach — one team handles design, engineering, and construction
🔸 6+ Years Experience — completed ADU and conversion projects across Northridge and the San Fernando Valley
🔸 Transparent Pricing — detailed written proposals with no hidden costs
🔸 End-to-End Service — foundation to final coat of paint, we handle everything
Our ADU Construction Process
1. Free Consultation — we visit your property, assess the space, and discuss your goals and budget
2. Feasibility Study — we evaluate setbacks, zoning rules, and utility connections for your specific lot
3. Design & Drawings — we prepare permit-ready architectural drawings and plans
4. Permit Submission — we submit all documents to the City of Los Angeles or LA County and manage the approval process
5. Construction — our licensed team handles every phase: foundation, framing, plumbing, electrical, insulation, drywall, flooring, cabinets, and finishes
6. Inspections & Sign-Off — we coordinate all required city inspections and obtain your Certificate of Occupancy
7. Final Walkthrough — your new ADU is ready to rent or move in
Garage Conversion vs. New ADU — Which Is Right for You?
Not sure whether to convert your garage or build a new structure? Here’s a quick comparison:
Garage Conversion:
– Lower cost (existing structure, no foundation needed)
– Faster timeline (2–4 months)
– Ideal if you don’t need your garage for parking
– Great for studios or 1-bedroom units
Detached ADU (New Build):
– More flexibility in size and layout
– Higher rental income potential
– Better privacy for tenants
– Higher upfront cost but greater long-term ROI
GN Builders will help you evaluate both options and recommend the best solution for your property and budget.
Serving Northridge and Surrounding Areas
We build ADUs and garage conversions throughout Northridge, Chatsworth, Granada Hills, Canoga Park, Reseda, Van Nuys, Woodland Hills, and all of Los Angeles County. Contact us today to find out what’s possible on your property.
Frequently Asked Questions — ADU & Garage Conversion in Northridge
How long does it take to build an ADU in Northridge?
A garage conversion typically takes 3–5 months from permit submission to move-in. A new detached ADU takes 6–12 months depending on size and complexity. Permitting timelines vary by city.
Do I need a permit for a garage conversion in LA County?
Yes. All ADUs and garage conversions require building permits. GN Builders handles the entire permit process — drawings, submission, revisions, and inspections — so you don’t have to.
Can I rent out my ADU in Northridge?
Yes. ADUs in California can be legally rented to tenants. A 1-bedroom ADU in Northridge typically rents for $1,500–$2,500/month depending on finishes and location.
Will an ADU increase my property taxes?
Yes, but only the value of the new ADU is reassessed — not your entire property. The increase is typically modest compared to the rental income and property value gains an ADU provides.
Can I build an ADU if I have an HOA?
California law (AB 670) prohibits HOAs from banning ADUs outright. However, some design restrictions may still apply. GN Builders will review your HOA rules and advise you on what’s permitted.
Ready to Add an ADU to Your Property?
Find out how much your ADU could earn and how much it would cost — with a free, no-obligation consultation from GN Builders.
📞 Call: (323) 372-7272
🌐 gnbuildersla.com
📍 Northridge, CA — Serving the San Fernando Valley & LA County
Licensed General Contractor — Lic #1134674