Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Glendale ADU cost →Building an ADU in Glendale costs between $180,000-$400,000 for new construction, with per-square-foot costs averaging $300-$500. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $100,000-$200,000, while prefab/modular ADUs fall in between at $180,000-$300,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Approximately $6,000-$18,000 total (plan check, building permit, school fees, utility connections — builder estimates); Glendale Water & Power connection fees add roughly $2,000-$5,000 for new services. Confirm with the Building Division, (818) 548-3200 |
| Impact Fees | ADUs under 750 sq ft are exempt from development impact fees (state law); larger units pay proportional fees |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. Get up to 3 free quotes from ADU builders serving Glendale — no obligation.
Get Glendale builder quotes →Permit fees in Glendale are Approximately $6,000-$18,000 total (plan check, building permit, school fees, utility connections — builder estimates); Glendale Water & Power connection fees add roughly $2,000-$5,000 for new services. Confirm with the Building Division, (818) 548-3200. The review timeline is 60-day ministerial review; deemed approved if the city fails to act within 60 days (SB 543, eff. Jan 1, 2026), with plan check: Included in valuation-based permit fees; expedited review available for pre-approved standard plans. Impact fees are ADUs under 750 sq ft are exempt from development impact fees (state law); larger units pay proportional fees. Pre-approved plans: Yes — Glendale's Standard ADU Plan Program (Pre-Approved ADU Program) offers expedited review using plans designed and owned by listed firms (e.g., a 1-story 740 sq ft 1-bed/1-bath plan); plans are purchased directly from the designers.
| 1-Bedroom Rent | $2,000-$2,700/month |
| 2-Bedroom Rent | $2,800-$3,400/month |
| Annual Rental Income (est.) | $28,200/year |
| Payback Period (est.) | 10.3 years |
| Short-Term Rental | No — short-term rentals under 30 days are not permitted for ADUs in Glendale |
| Overall ROI Estimate | 5-8% annual return |
A typical ADU in Glendale generates approximately $28,200 per year in rental income based on average 1-bedroom rents. At an average construction cost of $290,000, the estimated payback period is 10.3 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Glendale and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Glendale: $100,000-$200,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $180,000-$300,000.
3. Pre-approved plans — available in Glendale, which can save $3,000-$10,000 in design costs and 2-3 months in review time.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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