Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Glendale ADU cost →Building an ADU in Glendale costs between $120,000-$245,000 for new construction, with per-square-foot costs averaging $145-$270. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $55,000-$135,000, while prefab/modular ADUs fall in between at $85,000-$200,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | The city's own worked estimate for a 1,000 sq ft ADU (ADU handout, revised March 6, 2025): review fees of $1,370 (zoning clearance $144, building plan review $1,052.90, planning review $122.88, right-of-way review $35.88, record retention $14.04) plus permit fees of $2,034 (building permit $1,403.86, right-of-way permit $443.60, ¾-inch water meter set $126.73, fitting fee $60.19). Based on a city construction valuation of $120,750 for 1,000 sq ft |
| Impact Fees | Yes, and they are most of the bill: $9,630 for a detached ADU (water $3,330, sewer $3,795, parks $936, police $719, fire $655, libraries $195), which pays the single-family schedule, and $8,780 for an attached ADU on the lower multifamily schedule. No streets impact fee — state law forbids it. All-in city estimate for 1,000 sq ft: $13,034 detached, $12,184 attached (City of Glendale ADU handout, revised 3/6/2025) |
| 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 5 free quotes from ADU builders serving Glendale — no obligation.
Get Glendale builder quotes →Permit fees in Glendale are The city's own worked estimate for a 1,000 sq ft ADU (ADU handout, revised March 6, 2025): review fees of $1,370 (zoning clearance $144, building plan review $1,052.90, planning review $122.88, right-of-way review $35.88, record retention $14.04) plus permit fees of $2,034 (building permit $1,403.86, right-of-way permit $443.60, ¾-inch water meter set $126.73, fitting fee $60.19). Based on a city construction valuation of $120,750 for 1,000 sq ft. The review timeline is Confirm with Glendale Planning — no published ADU review timeline found in a city source, with plan check: Full residential plan review under Glendale's building, fire and public-health codes (Glendale Code 35.3.204.A.22–23). State law bars a commercial building code or a fire-sprinkler requirement for an ADU (A.R.S. §9-461.18(D)). Budget for the separate city water meter: it needs a new tap to the main in the street or right-of-way, a right-of-way permit and a specially licensed contractor (35.3.204.A.24 and the city handout). Impact fees are Yes, and they are most of the bill: $9,630 for a detached ADU (water $3,330, sewer $3,795, parks $936, police $719, fire $655, libraries $195), which pays the single-family schedule, and $8,780 for an attached ADU on the lower multifamily schedule. No streets impact fee — state law forbids it. All-in city estimate for 1,000 sq ft: $13,034 detached, $12,184 attached (City of Glendale ADU handout, revised 3/6/2025). Pre-approved plans: No city pre-approved ADU plan library found — confirm with Glendale Development Services.
| 1-Bedroom Rent | $1,050-$1,350/month |
| 2-Bedroom Rent | $1,350-$1,700/month |
| Annual Rental Income (est.) | $14,400/year |
| Payback Period (est.) | 12.7 years |
| Short-Term Rental | Yes, if you live on site: once the owner occupies either the main house or the ADU as their principal residence, the other unit may be rented for periods shorter than 30 days (Glendale Code 35.3.204.A.25). Arizona TPT registration applies and Glendale may require a short-term rental licence — confirm with the city. If neither unit is owner-occupied, the ADU may not be rented separately at all, short- or long-term (A.26); see the owner-occupancy note for the state-law tension on the long-term side |
| Overall ROI Estimate | 5-8% annual return |
A typical ADU in Glendale generates approximately $14,400 per year in rental income based on average 1-bedroom rents. At an average construction cost of $182,500, the estimated payback period is 12.7 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: $55,000-$135,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $85,000-$200,000.
3. Pre-approved plans — Glendale does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000). See which cities offer pre-approved ADU plans.
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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