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 California.
What ADU Builders Cost in Glendale [10][11]
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) | $175,000-$375,000 |
| Cost per Sq Ft | $275-$475 |
| Garage Conversion | $75,000-$200,000 |
| Prefab / Modular ADU (installed) | $180,000-$300,000 |
| City Permit & Plan Review | Glendale publishes no flat ADU permit fee: plan check and building permit fees are valuation-based, so request an estimate from the Building Division, (818) 548-3200. The city's development impact fee is about $5,000 and is waived for ADUs of 750 sq ft or less. |
| Impact Fees | ADUs of 750 sq ft or less are exempt from development impact fees (Gov. Code 66311.5); Glendale charges about $5,000 for larger ADUs (city ADU page), which state law limits to a share proportional to the primary dwelling's fee. |
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: 1,000 sq ft maximum: 850 sq ft with one bedroom, and any ADU over 850 sq ft must have a second bedroom. An ADU of 800 sq ft or less is the state-protected size (4-ft side and rear setbacks, no floor-area-ratio or lot-coverage test); over 800 sq ft the zone's FAR, lot coverage and landscaping standards apply (GMC 30.34.080; city ADU page, Nov. 7, 2025).; owner-occupancy: None for ADUs (state law, Gov. Code 66315). JADUs: the state owner-occupancy rule no longer applies to a JADU with its own bathroom (AB 1154, eff. Jan. 1, 2026); Glendale still records a JADU covenant under 30.34.080(I), so ask Planning which terms remain.).
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How to Vet an ADU Builder in Glendale
- License: Confirm a current contractor's license in California 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 (Glendale publishes no flat ADU permit fee: plan check and building permit fees are valuation-based, so request an estimate from the Building Division, (818) 548-3200. The city's development impact fee is about $5,000 and is waived for ADUs of 750 sq ft or less.), plan check (Valuation-based plan check by the Building Division; submittal needs a site plan, floor plan, elevations, roof plan, sections and a photo survey of the site (city ADU page). A pre-approved Standard Plan gets expedited review.), and impact fees (ADUs of 750 sq ft or less are exempt from development impact fees (Gov. Code 66311.5); Glendale charges about $5,000 for larger ADUs (city ADU page), which state law limits to a share proportional to the primary dwelling's fee.) are included.
- Permit handling: Confirm they manage Glendale's permit process ("Ministerial building permit through Community Development's Permit Services Center: check zoning with Planning first ((818) 548-2140), clear Glendale Water & Power easements, then apply online in the city's permit portal ('Building Combination (Single Family) - Accessory Dwelling Unit'). An ADU covenant and agreement is filed through the city's online application; JADUs record a covenant under 30.34.080(I).", typically State law requires a decision within 60 days of a complete application and, since Jan. 1, 2026 (SB 543), the application is deemed approved if the city misses that deadline; Glendale does not publish its own review times.) 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 (State law requires a decision within 60 days of a complete application and, since Jan. 1, 2026 (SB 543), the application is deemed approved if the city misses that deadline; Glendale does not publish its own review times.) 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 California ADU client references?
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