ADU Builders in Glendale, AZ (2026)

An ADU builder in Glendale is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Glendale's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Arizona.

What ADU Builders Cost in Glendale ^[13]^[14]^[15]^[16]

Based on our Glendale cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.

New Detached ADU (all-in)	$150,000-$280,000
Cost per Sq Ft	$175-$350
Garage Conversion	$80,000-$150,000
Prefab / Modular ADU (installed)	$150,000-$300,000
City Permit & Plan Review	$2,500-$3,400 in review and permit fees for a 500-1,000 sq ft ADU (May 2019 fee schedule Table 3A at the city's $120.75/sq ft valuation; city's 1,000 sq ft estimate: zoning clearance $144, plan review $1,052.90, permit $1,403.86, right-of-way permit $443.60) — plus the $775.25 impact fee
Impact Fees	Yes, but small since Sept 8, 2025: the Development Impact Fee Schedule (updated 6/24/2026) charges an ADU, attached or detached, 25% of the single-family rate — fire $212.50, library $88.75, parks $298.50, police $175.50, streets $0 — $775.25 in total. Water and wastewater impact fees apply only if the ADU's demand forces a larger meter, and then only the difference between sizes (3/4-inch to 1-inch: $11,898 − $7,125 = $4,773). The March 2025 handout's $9,630 detached / $8,780 attached impact-fee figures predate this schedule

For a full line-item breakdown, see our Glendale ADU cost guide. To confirm what you're allowed to build before you hire, review the Glendale ADU rules (max detached size: Up to the gross floor area of the existing house, but never more than 1,000 sq ft (UDC §35.3.204.A.16; Ord. O25-45 changed 'square footage' to 'gross floor area'). Gross floor area is measured within the exterior walls (§35.8.004). This beats the state floor of the lesser of 1,000 sq ft or 75% of the house (A.R.S. §9-461.18(A)(3)), so a 1,000 sq ft casita is legal behind a 1,000 sq ft house; owner-occupancy: Not required for a long-term lease. Since Ord. O25-45 (adopted Nov 25, 2025) the rule applies only to short-term rentals: to rent either unit for under 30 days the owner (title holder or contract purchaser) must live in the house or the ADU (UDC §35.3.204.A.25). The old A.26 ban on renting an ADU separately when neither unit was owner-occupied was deleted, in line with A.R.S. §9-461.18(B)(1)-(2). Owners with an ADU certificate of occupancy on or before Sept 14, 2024 are exempt (A.26)).

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How to Vet an ADU Builder in Glendale

License: Confirm a current contractor's license in Arizona and that it's in good standing. Ask for the license number and verify it with the state board.
ADU-specific experience: Ask how many ADUs they've completed in or near Glendale and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits ($2,500-$3,400 in review and permit fees for a 500-1,000 sq ft ADU (May 2019 fee schedule Table 3A at the city's $120.75/sq ft valuation; city's 1,000 sq ft estimate: zoning clearance $144, plan review $1,052.90, permit $1,403.86, right-of-way permit $443.60) — plus the $775.25 impact fee), plan check (Full residential plan review under the 2024 International Building, Residential and Fire Codes with city amendments, adopted Dec 9, 2025 and effective Jan 9, 2026 (UDC §35.3.204.A.22). State law bars a commercial code or a fire-sprinkler requirement for an ADU (A.R.S. §9-461.18(D)). Budget for the separate city water meter every ADU must have (A.24): a new tap to the main in the street, a right-of-way permit and a licensed contractor. Expedited review halves the target time at 300% of the plan-review fee), and impact fees (Yes, but small since Sept 8, 2025: the Development Impact Fee Schedule (updated 6/24/2026) charges an ADU, attached or detached, 25% of the single-family rate — fire $212.50, library $88.75, parks $298.50, police $175.50, streets $0 — $775.25 in total. Water and wastewater impact fees apply only if the ADU's demand forces a larger meter, and then only the difference between sizes (3/4-inch to 1-inch: $11,898 − $7,125 = $4,773). The March 2025 handout's $9,630 detached / $8,780 attached impact-fee figures predate this schedule) are included.
Permit handling: Confirm they manage Glendale's permit process ("Two steps, by right — no hearing, variance or use permit (A.R.S. §9-461.18(I)(5)). First a Zoning Clearance from Planning: file a Planning Service Request to be assigned a planner; the written determination is due within 10 working days of a complete application (UDC §35.3.204.A.2, §35.6.210.B.4). Then building permits through Development Services, submitted electronically as one PDF (permits@glendaleaz.com, 623-930-2800). Choosing a city Permit-Ready ADU plan swaps the design step for a site plan review", typically about 10 working days for the zoning-clearance determination (UDC §35.6.210.B.4), then a 10-business-day target for the first building plan review of room additions and accessory buildings, 15 for custom home plans (city Plan Review Turnaround Times sheet)) and who is responsible if revisions are required.
Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.

Questions to Ask Before You Hire

How many ADUs have you built in Glendale in the last two years?
Is your bid fixed-price, and what would trigger a change order?
Are permits, plan check, and utility connection fees included?
What's a realistic timeline, including permit review (about 10 working days for the zoning-clearance determination (UDC §35.6.210.B.4), then a 10-business-day target for the first building plan review of room additions and accessory buildings, 15 for custom home plans (city Plan Review Turnaround Times sheet)) and construction?
Who is my point of contact and how are delays communicated?
What warranty do you provide on workmanship?
Can you share three recent Arizona ADU client references?

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Frequently Asked Questions

How much do ADU builders charge in Glendale?

ADU builders in Glendale typically quote $150,000-$280,000 for a new detached unit, or about $175-$350 per square foot, including design, permitting, and construction. A garage conversion runs $80,000-$150,000 and a prefab/modular ADU averages $150,000-$300,000. Add city permit and plan-review fees ($2,500-$3,400 in review and permit fees for a 500-1,000 sq ft ADU (May 2019 fee schedule Table 3A at the city's $120.75/sq ft valuation; city's 1,000 sq ft estimate: zoning clearance $144, plan review $1,052.90, permit $1,403.86, right-of-way permit $443.60) — plus the $775.25 impact fee) plus impact fees of Yes, but small since Sept 8, 2025: the Development Impact Fee Schedule (updated 6/24/2026) charges an ADU, attached or detached, 25% of the single-family rate — fire $212.50, library $88.75, parks $298.50, police $175.50, streets $0 — $775.25 in total. Water and wastewater impact fees apply only if the ADU's demand forces a larger meter, and then only the difference between sizes (3/4-inch to 1-inch: $11,898 − $7,125 = $4,773). The March 2025 handout's $9,630 detached / $8,780 attached impact-fee figures predate this schedule. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.

How do I find a good ADU builder in Glendale?

Look for a licensed contractor with completed ADU projects in Glendale specifically — ADUs involve local zoning, setback rules, and utility connections that general remodelers may not have handled. Verify the license, ask for an ADU-specific portfolio and references, confirm they carry liability and workers' comp insurance, and get a written fixed-price or detailed bid. Submit a request below and we'll forward it to local ADU builders serving Glendale for free quotes.

Do ADU builders in Glendale handle permits?

Most full-service ADU builders manage the permit process for you. In Glendale the approval process is "Two steps, by right — no hearing, variance or use permit (A.R.S. §9-461.18(I)(5)). First a Zoning Clearance from Planning: file a Planning Service Request to be assigned a planner; the written determination is due within 10 working days of a complete application (UDC §35.3.204.A.2, §35.6.210.B.4). Then building permits through Development Services, submitted electronically as one PDF (permits@glendaleaz.com, 623-930-2800). Choosing a city Permit-Ready ADU plan swaps the design step for a site plan review" with a typical review timeline of about 10 working days for the zoning-clearance determination (UDC §35.6.210.B.4), then a 10-business-day target for the first building plan review of room additions and accessory buildings, 15 for custom home plans (city Plan Review Turnaround Times sheet). Confirm in writing whether permit fees, plan check (Full residential plan review under the 2024 International Building, Residential and Fire Codes with city amendments, adopted Dec 9, 2025 and effective Jan 9, 2026 (UDC §35.3.204.A.22). State law bars a commercial code or a fire-sprinkler requirement for an ADU (A.R.S. §9-461.18(D)). Budget for the separate city water meter every ADU must have (A.24): a new tap to the main in the street, a right-of-way permit and a licensed contractor. Expedited review halves the target time at 300% of the plan-review fee), and impact fees are included in the bid or billed separately.

How long does it take to build an ADU in Glendale?

Plan for the permit review (about 10 working days for the zoning-clearance determination (UDC §35.6.210.B.4), then a 10-business-day target for the first building plan review of room additions and accessory buildings, 15 for custom home plans (city Plan Review Turnaround Times sheet) in Glendale) plus construction. Most detached ADUs take 4-8 months of construction after permits are issued; garage conversions and prefab units are often faster. Ask each builder for a realistic schedule and what could delay it.

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Build Cost	$150,000-$280,000
Garage Conv.	$80,000-$150,000
Permit Fees	$2,500-$3,400 in review and permit fees for a 500-1,000 sq ft ADU (May 2019 fee schedule Table 3A at the city's $120.75/sq ft valuation; city's 1,000 sq ft estimate: zoning clearance $144, plan review $1,052.90, permit $1,403.86, right-of-way permit $443.60) — plus the $775.25 impact fee
Timeline	about 10 working days for the zoning-clearance determination (UDC §35.6.210.B.4), then a 10-business-day target for the first building plan review of room additions and accessory buildings, 15 for custom home plans (city Plan Review Turnaround Times sheet)
1BR Rent	$1,200-$1,750/mo

What ADU Builders Cost in Glendale [13][14][15][16]