Best ADU Builders in Northridge, CA
Compare vetted, CSLB license-verified ADU builders and ADU contractors in Northridge. The average cost to build an ADU in Northridge is $280–$420 per square foot. Top-rated builders include Quality First Builders, Acton ADU, Progressive Builders.
Every builder below is CSLB license-verified, bonded, and insured — vetted before they ever reach a homeowner. Browse ratings and real reviews, compare starting prices, or let us match you with the best fit for your lot and budget. It's free; we're paid by the builders, not you.
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What kind of ADU are you planning?
ADU activity in Northridge
Recent LADBS records show permit volume, project size, and valuation patterns for ADU work in Northridge.
- Permits since 2020
- 726
- LADBS ADU permit activity
- Typical size
- 953 sq ft
- Average permitted ADU size
- Average valuation
- $94,644
- Average permit valuation
Trend: recent LADBS activity is tracking close to earlier years, averaging 110 permits per year in 2025-2026 versus 101 per year in 2020-2024.
Source: LA Dept. of Building & Safety.
Showing 9 of 9 builders in Northridge, CA
Last updated July 16, 2026
License VerifiedQuality First Builders
Serving Northridge, CA · Sherman Oaks, CA
“Before we started I honestly thought a garage ADU would feel like exactly that... a garage that someone tried to dress up. That was my biggest concern because t…”— Vicente Enriquez
Pricing on request
Design-build ADUs, additions and remodels across Los Angeles and the San Fernando Valley.
License VerifiedActon ADU
Serving Northridge, CA · Campbell, CA
“We had a great experience working with Acton ADU on our ADU project, and I want to give a special shoutout to Sandro. Sandro was fantastic from start to finish—…”— N K
Pricing on request
A California general building contractor licensed since 1992, serving the LA market statewide.
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License VerifiedProgressive Builders
Serving Northridge, CA · Canoga Park, CA
“Instead of replacing one thing at a time, we decided to do the bathroom remodel properly in one project. That choice saved us from having to redo the work later…”— Isaac Bailey
Pricing on request
Your Vision, Our Craft — transforming LA homes inside and out.
License VerifiedGolden ADU
Serving Northridge, CA · Los Angeles, CA
“We begun the first phase of our ADU project and so far the experience has been very positive. The team has been professional and organize throughout the demolit…”— Marcia Berry
Pricing on request
Trusted design-build ADU specialists for Los Angeles and surrounding communities.
License VerifiedVilla Homes
Serving Northridge, CA · San Francisco, CA
“Excellent job! The Villa crew from start to finish nothing short of professional. Foundation, home delivery, finish work etc top notch. I would recommend Vill…”— M Ferreira
Pricing on request
Tech-enabled prefab ADU builder delivering turnkey backyard homes across California.
License VerifiedOtto ADU
Serving Northridge, CA · Los Angeles, CA
“We hired Otto ADU to design and supervise the building of our new ADU. They did a great job. The new ADU (which replaced our garage) is beautiful and, despite…”— ARP in LA
Pricing on request
Los Angeles ADU builders who make life easier — more space, more income, less stress.
License VerifiedNestadu
Serving Northridge, CA · Mill Valley, CA
“Nestadu did a great job on my backyard ADU. Their team was professional, and the final result looks fantastic—well-built and blends in nicely with my home. Pric…”— Stephen Reid
Pricing on request
Custom and prefab ADUs for California homeowners — design, permit, and build, turnkey.
License VerifiedKhanstruction Custom Home & ADU Builder
Serving Northridge, CA · Northridge, CA
“I used Khanstruction for planning and re-racking my warehouse, and the experience was excellent. We originally scheduled the project for two days over the weeke…”— Hamza Khalid
Pricing on request
CSLB-verified B contractor in Northridge, CA.
License VerifiedGather ADU
Serving Northridge, CA · Northridge, CA
New to the directory
Pricing on request
LA's full-service ADU experts — design, permits, and construction under one roof.
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Frequently Asked Questions
- How much does it cost to build an ADU in Northridge, CA?
- In Northridge, ADUs typically run $280–$420 per square foot all-in. A detached 800 sq ft unit commonly lands between $230k and $340k depending on finishes, site conditions, and utility connections. Garage conversions are the most affordable path, often under $180k.
- How long does it take to build an ADU in Northridge?
- Plan to budget 6–12 months end to end. California law caps ADU plan check at 60 days for compliant designs, and construction usually takes 4–8 months after permits are issued.
- Do I need a permit to build an ADU in Northridge?
- Yes. All ADUs require a building permit, but California mandates ministerial (non-discretionary) approval for compliant units, so there's no public hearing or design review. Your builder typically pulls the permit on your behalf.
- How do I choose a builder in Northridge?
- Confirm the contractor holds an active CSLB license, is bonded and insured, and has built ADUs in Northridge specifically. Every builder in this directory is license-verified. Use "Get a Quote" to be matched with the best fit for your lot and budget.
ADU costs in Northridge: city vs. metro vs. state
Building an ADU in Northridge runs roughly $280–$420 per square foot all-in. Here's how the city benchmarks against the broader metro and statewide averages.
| Area | Avg. cost / sq ft | Typical 800 sq ft ADU |
|---|---|---|
| Northridge | $280–$420 | $224,000–$336,000 |
| Northridge metro | ~$350 | ~$280,000 |
| California (CA) | ~$330 | ~$264,000 |
Cost by ADU type in Northridge
| ADU type | Typical size | Project cost | Timeline |
|---|---|---|---|
| Detached ADU | 600–1,200 sq ft | $180,000–$420,000 | 8–12 months |
| Attached ADU | 400–800 sq ft | $140,000–$300,000 | 6–10 months |
| Garage Conversion | 400–600 sq ft | $90,000–$180,000 | 4–7 months |
| JADU (Junior ADU) | ≤ 500 sq ft | $60,000–$140,000 | 3–6 months |
ADU rules & permits in Northridge, CA
Northridge ADU permits are handled through LADBS under California's 60-day ministerial review rules for compliant ADUs. Confirm lot-specific setbacks, height, parking, and utility details before submitting plans.
| Jurisdiction | Permit timeline | Permit fees | Notes |
|---|---|---|---|
| City of Los Angeles | 60-day plan check (by law) | $3k–$8k | Pre-approved Standard Plan program available |
| Unincorporated LA County | 60–90 days | $4k–$10k | Ministerial approval for compliant ADUs |
| Statewide (CA) | 60 days max by statute | Varies | Owner-occupancy requirement waived through 2030 |
Financing your ADU in Northridge
Most Northridge homeowners compare renovation loans, construction loans, HELOCs, and cash-out refinancing. ADU-focused lenders can underwrite against after-build value when the new unit materially increases rent or resale potential.
Construction / renovation loan
Funds released in draws as the build hits milestones; underwritten against after-build value.
HELOC / home equity
Borrow against existing equity. Fast to set up if you have 20%+ equity.
Cash-out refinance
Replace your mortgage and pull equity as cash — best when rates are favorable.
ADU-specific lenders
RenoFi and similar lenders underwrite the projected value the ADU adds, often unlocking more.
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.