Our ADU gallery features garage conversions, detached new-build ADUs, and Junior ADUs (JADUs) completed across Los Angeles. California's progressive ADU laws make adding a secondary dwelling unit one of the smartest investments for LA homeowners. Costs range from $40,000 for a JADU to $350,000 for a large detached ADU.
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“The detail that kills ADU budgets: underestimating utility connections. If your ADU needs a new sewer lateral connection to the main line (common on lots where the house lateral runs across the back yard), that alone can add $15–25K. We verify lateral location in the feasibility phase, before design starts.”
Specify the ADU meter separately from the main house in your permit application. A separately metered ADU allows the tenant to pay their own utilities and is far more attractive to long-term tenants. The utility company's meter installation adds 4–6 weeks to the project timeline; don't leave this as an afterthought.
The most common adu construction mistakes in Gallery are: selecting a contractor based on price alone without verifying CSLB license and insurance, approving change orders verbally rather than in writing, and starting work before permits are issued. All three create financial and legal exposure that's avoidable with careful contractor selection and contract management.
NP Line Design provides no-obligation project consultations for adu construction in Gallery. We'll review your scope, walk your project site, and provide a detailed written estimate. CSLB License #1105249. Call or submit online at nplinedesign.com to schedule your Gallery consultation.
Real projects completed by NP Line Design across Los Angeles County. Photos updated as new projects are completed.
NP Line Design provides turnkey ADU construction: feasibility assessment, architectural design, LADBS permitting, foundation, framing, MEP systems, and finish work. We navigate LA's ADU regulations including SB 9, AB 68, and local overlay zones to maximize your property's potential.
| Scope | Cost Range | Timeline |
|---|---|---|
| JADU (under 500 sqft) | $40,000 – $80,000 | Interior conversion, kitchenette, bath |
| Garage Conversion | $75,000 – $200,000 | Foundation, insulation, full kitchen/bath |
| Detached ADU (400-800 sqft) | $150,000 – $280,000 | New build, full kitchen, bath, HVAC |
| Detached ADU (800-1200 sqft) | $220,000 – $350,000 | 2-bed, full amenities, premium finishes |
Prices reflect March 2026 Los Angeles market rates. Actual costs vary by project scope and site conditions.
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ADU Construction Portfolio
ADU costs in LA range from $40,000 for a JADU to $350,000 for a large detached unit. Garage conversions average $75,000 to $200,000. Add $15,000 to $35,000 for permits and design.
ADU construction takes 3 to 8 months depending on type. Garage conversions are fastest (3-6 months). New detached ADUs typically require 5-8 months including the permit phase.
Yes. All ADUs require LADBS building permits, architectural plans, Title 24 energy compliance, and structural calculations. NP Line Design handles the entire permit process.
ADUs in LA generate $1,500 to $3,500/month in rental income and add 20-30% to property value. Most ADUs pay for themselves within 5-8 years through rental income alone.
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