What happens if you skip the permit (and you needed one)
- Stop-work orders and $500–$1,500 daily fines from Glendale Code Enforcement; unpermitted work discovered at title transfer triggers lender denial and forced removal at your cost ($20,000–$80,000).
- Insurance claims for injuries or property damage in an unpermitted ADU are denied outright; liability falls entirely on you ($100,000+ exposure).
- Resale disclosure requirement: California requires you to disclose all unpermitted work on the Transfer Disclosure Statement; buyer can rescind or demand price reduction ($50,000–$150,000 hit).
- Refinance or HELOC blocked: lenders pull permit history; unpermitted structure is treated as non-existent equity ($200,000–$500,000 borrowing power lost on a typical property).
Glendale ADU permits — the key details
California Government Code 65852.2 (amended by AB 68, AB 881, SB 9) mandates that cities allow ADUs and cannot impose most local restrictions that were common before 2020. Glendale adopted its local ADU ordinance in compliance, but retains design-review authority for units visible from public right-of-way. The state law says you can build one ADU per single-family lot (two if one is junior) without owner-occupancy, without a rear setback, and without parking (under 750 sq ft). Glendale's twist: they require a minimum 5-foot side/rear setback for detached ADUs and prefer ground-floor conversions over new detached units in established neighborhoods. The Glendale Building Department's official ADU design guidelines (available on their website) spell out this preference, but state law preempts arbitrary denial. If you're building a detached ADU on a 5,000-sq-ft lot in central Glendale (single-family zones), state law guarantees approval if setbacks are met, utilities are separate, and egress is to a public street. Glendale does NOT allow ADUs in multi-family zones, which differs from some LA County cities — check your zoning first.
Utility separation is a hard requirement and the biggest real-world sticking point in Glendale. Your ADU must have its own water meter, sewer connection (or private septic if unincorporated areas), and electrical panel—no sharing with the main house except as allowed by NEC 210.12 (GFCI for bathrooms/kitchens). Glendale Water & Power (the city's municipal utility) requires a separate service application ($500–$1,200 fee, 4-6 week turnaround). If your lot's sewer line is shared, you'll need a grinder pump or a separate cleanout stub—this can cost $3,000–$8,000 and is easy to overlook in early estimates. The Glendale Building Department's plan-review checklist explicitly asks for utility separation drawings signed by a licensed plumber and electrician. Don't guess: contact GWP early (they have a dedicated ADU hotline) and request a site-specific utility feasibility letter. Some lots on the east side near Burbank border have shared sewer laterals that will require easement agreements with neighbors—plan 2-3 months for this negotiation if it applies.
Egress and bedroom count drive setback and fire-rating requirements under IRC R310 and California Title 24. A one-bedroom ADU with egress to a common side yard (in a garage conversion) requires that side yard to be at least 3 feet wide and 10 feet long per IRC R310.1. A two-bedroom detached ADU (less common but allowed) needs two egress points, typically one direct to grade and one to an emergency window—this is why detached units are disfavored in Glendale's design guidelines. The state code requires tempered glass in bathroom windows if they're the emergency egress; Glendale's plan reviewers are strict about this. Junior ADUs (efficiency units carved from the main house, no exterior expansion) skip most setback rules but must have separate metering and a separate entrance. If you're doing a garage conversion, the former garage door opening counts as your primary egress, but you'll need to rebuild that wall to IRC R602 (2x6 studs, fire-blocking at floor plates). The fire-rating between ADU and main house is R-1 (1-hour) per state law if they share a wall; if detached, no rating needed.
Glendale's 60-day review clock (state-mandated ministerial timeline) starts when you submit a complete application. 'Complete' means: site plan at 1/16 inch scale showing setbacks and utilities, floor plans, elevations, section details showing foundation (if detached) per IRC R401-R408, electrical one-line, plumbing schematic, and a signed affidavit that you've reviewed the design guidelines. Many applicants miss the electrical schematic (especially sub-panel breaker layout) or forget the utility company's feasibility letter—each missing item resets the clock. If your project triggers design review (visible from street, within 500 feet of a historic district, or on a corner lot), Glendale adds 20-30 days for staff review and a neighborhood-compatibility sign-off. No public hearing is required per state law, but Glendale staff may request photos or a site visit. Once issued, you have two years to start construction; extensions are routinely granted but require paperwork.
Inspections follow the standard sequence: foundation (if detached), framing, rough electrical/plumbing, insulation and drywall, final building, final electrical, final plumbing, and final planning. Glendale's inspectors often spot non-compliant utility metering (sub-panels installed wrong, meter not accessible, etc.) at the framing stage, so have your licensed electrician on-site for that inspection. The city's permit tracking system (accessible online via their portal) shows real-time inspection status, which beats calling. Plan 1-2 weeks between consecutive inspections if you're using expedited scheduling (not always available). Fire sprinklers are typically not required for ADUs under 1,000 sq ft in single-family zoning, but if your lot's total square footage (main house + ADU) exceeds 5,000 sq ft in certain fire zones, sprinklers may trigger—have a fire marshal pre-check before designing. Glendale's final sign-off requires proof of separate utility accounts active (water bill, electrical account number), a notarized affidavit of completion, and a final walkthrough by the building official and planning staff. This last step often adds 2-3 weeks because coordination across departments is slow.
Three Glendale accessory dwelling unit (adu) scenarios
Glendale's design-review overlay and state-law preemption: what actually triggers discretionary review
Glendale's municipal code allows design review for ADUs in certain contexts, but state law (AB 68, AB 881, and SB 9) requires that design review be ministerial (objective, yes/no checklist) rather than discretionary (subjective judgment). The Glendale Planning Division interprets this to mean: if your ADU meets all objective standards (setbacks, lot coverage, height per zoning, utility separation), design review is automatic approval—no planning board hearing, no neighbor appeal, 20-30 days for paperwork only. The trigger zones are: properties within 500 feet of a historic resource, corner lots with street-visible frontage, and certain design-rich neighborhoods (Craftsman enclaves like Chevy Chase). In these areas, you'll submit color chips, material samples, roof-pitch documentation, and a site-compatibility narrative showing how your ADU fits the neighborhood character. Glendale staff will compare your proposal to a published design-review checklist (available on their website) and either approve or request minor modifications (typically one resubmittal round).
The critical detail: Glendale cannot deny an ADU based on design preferences alone. They can request material or color changes, but if you meet the objective checklist and state-law thresholds (setbacks, utilities, egress), they must issue the permit. This is fundamentally different from some LA County neighbors (e.g., South Pasadena) that have tighter design restrictions and longer review timelines. Glendale's approach is compliant and applicant-friendly. However, the 20-30-day design-review add-on is real; if you're in a design-review zone and your materials are obviously incompatible (modern minimalist box in a 1920s bungalow neighborhood), expect pushback and a resubmittal cycle. Budget time and be proactive: visit the planning counter, show concept sketches early, and ask for written feedback before submitting formally.
Practical timing impact: a simple garage conversion in a non-review zone (Scenario A) hits 45-60 days for plan review. The same conversion on a corner lot (Scenario B, detached) stretches to 75-90 days. A junior ADU (Scenario C) often comes in at 30-40 days because it's interior remodeling with automatic approval. Plan your schedule accordingly and ask Glendale's permit counter upfront: 'Is this property in a design-review overlay?' A 15-minute conversation saves a 20-day surprise.
Utility coordination in Glendale: water, sewer, and electrical timing—the real bottleneck
Glendale Water & Power (GWP) is the municipal water and electric utility, and their approval and installation schedule is often the longest pole in the tent for ADU projects. The city Building Department can issue your permit in 60 days, but you won't occupy the ADU until GWP has installed separate water and sewer meters and connected electrical service. GWP's current turnaround is 4-6 weeks for a feasibility letter (stating whether a new meter is possible and what the estimated cost is) and another 3-4 weeks for meter installation and connection once you've paid fees and submitted applications. The total GWP timeline is often 8-12 weeks—longer than the building permit itself. The mistake most applicants make: they submit the building permit application without first contacting GWP for a feasibility letter, thinking they'll fast-track it after permit approval. By then, 2-3 weeks have already slipped away. Best practice: contact GWP's ADU hotline the moment you start planning (even before hiring an architect). Request a site-specific feasibility letter for water, sewer, and electrical separation. GWP will tell you if your lot can support a second meter, what the cost is ($500–$1,500 per service), and how long installation takes. Armed with that letter, you include it in your building permit application, which shows Glendale that utilities are doable and speeds plan review.
Sewer coordination is especially critical in older Glendale neighborhoods where lots have shared lateral lines or where the main lateral is far from the backyard (common on corner lots). If your lot's sewer lateral is shared with a neighbor, you'll need to negotiate easement rights or install a separate lateral—this can cost $3,000–$8,000 and require a 2-3 month negotiation. GWP's feasibility letter will flag this early. Electrical service depends on main-panel capacity; if the existing service is 100 amps and you're adding an 800-sq-ft ADU with air conditioning, a new 200-amp main service may be required ($2,000–$3,500 in labor and materials, plus GWP's meter charge). GWP can provide a load-analysis report for roughly $200–$300 that tells you whether a new service is needed or if a sub-panel in the garage will suffice. Get this report early and include it in your building permit application. Glendale's plan reviewers will cross-check your electrical design against GWP's load analysis and reject sub-par designs—so do the legwork upfront.
Water separation is usually straightforward: GWP runs a second 3/4-inch line from the main meter to a new meter location (typically inside the ADU or in a meter box on the exterior). The cost is $500–$800 for GWP's connection fee, plus $1,000–$2,000 for trenching and materials. GWP owns the meter and shutoff; you own everything from the meter downstream. Coordinate the meter location with your plumber before submitting the building permit. Many applicants choose a location that GWP rejects (too far from the property line, wrong elevation, conflicts with other utilities), forcing a resubmittal. GWP's design standards are published on their website; review them with your plumber and include a detailed utility plan in the building permit packet showing proposed meter locations, isolation valves, and backflow preventers. This upfront clarity shrinks review time and avoids rejections. Timing reality: budget 10-12 weeks for full utility coordination (feasibility letter + applications + installation) and treat GWP's schedule as the critical path. The building permit process, construction, and inspections can often run in parallel with utility work, but you cannot occupy the ADU until all three utilities (water, sewer, electrical) are active and metered separately.
623 East Broadway, Glendale, CA 91205
Phone: (818) 548-2000 (main) or (818) 548-2080 (Building Department direct) | https://www.glendaleca.gov/residents/permits
Monday–Friday, 8:00 AM–5:00 PM (closed city holidays)
Common questions
Does California's ADU law override Glendale's local zoning restrictions?
Yes. Government Code 65852.2 (as amended by AB 68 and AB 881) mandates that cities must allow at least one ADU per single-family lot and cannot impose most local restrictions (lot size, owner-occupancy, setbacks for certain ADU types, parking, etc.). Glendale complies by issuing ministerial permits for ADUs that meet state thresholds. However, Glendale retains the right to impose objective design standards and may apply design review in certain overlay zones. The net effect: your ADU is approved by state law, but Glendale's review and design requirements still apply and can add 20-30 days.
What's the difference between a junior ADU and a standard ADU in Glendale?
A junior ADU is an efficiency unit (no more than 500 sq ft) carved from the existing main house without adding square footage or expanding the structure's footprint. Standard ADUs can be detached new construction, garage conversions, or above-garage units, and can be up to 1,200 sq ft. Junior ADUs have faster permit timelines (30-45 days vs. 60-90 days), skip design review, and are cheaper to build (no new foundation or exterior work). However, they're limited to small spaces and must have a separate entrance and kitchen. Glendale allows one junior ADU per lot in addition to one standard ADU (per state law), but in practice, most properties choose one or the other.
Does Glendale require me to own the main house or live in it to build an ADU?
No. California Government Code 65852.2 eliminated owner-occupancy requirements effective January 1, 2020. Glendale enforces the state standard: you can own and rent out both the main house and ADU without restrictions. There's no requirement that one unit be owner-occupied. This is an important advantage for investors.
Are parking spaces required for an ADU in Glendale?
No, not for ADUs under 750 sq ft per state law. Glendale adopted this standard. For ADUs between 750 sq ft and 1,200 sq ft, one parking space is required, but it can be located on the driveway, in the garage (if the main house has alternative parking), or on the street if available. Glendale does not enforce residential parking permit programs for ADUs, so street parking is usually viable.
How long does it take to get an ADU permit in Glendale?
The state-mandated ministerial timeline is 60 days from a complete application. In practice: a simple garage conversion or junior ADU often issues in 45 days. A detached ADU on a corner lot (design review required) typically takes 75-90 days. The biggest variable is utility coordination with Glendale Water & Power, which can stretch the overall project timeline to 10-12 weeks before occupancy is allowed. Always assume 3-4 months from application to occupancy.
What inspections does Glendale require for an ADU?
The full building inspection sequence applies: foundation (if detached), framing, rough electrical and plumbing, insulation and drywall, final building, final electrical, and final plumbing. Glendale's planning division also conducts a final planning inspection to verify parking, setbacks, and utility separation. Junior ADUs skip foundation and framing inspections (interior remodel only) and usually require 4 inspections total. Budget 1-2 weeks between consecutive inspections.
Can I use a pre-approved ADU plan to speed up the permit?
California has statewide pre-approved ADU plans available free (search 'California Department of Housing and Community Development pre-approved ADU plans'), and Glendale accepts these per state law. A pre-approved plan can reduce plan-review time by 50% and eliminates the need for an architect (though you'll still need a licensed electrician and plumber for utilities and site-specific details). However, pre-approved plans often have generic utility layouts that don't match your lot's constraints, so you may still need customization. Ask Glendale's permit counter if they've issued permits using pre-approved plans and what their experience is.
What if my lot is in a flood zone or on a hillside? Are there additional requirements?
Yes. Glendale has flood-zone and hillside-design overlays that may trigger additional requirements. Flood zones require elevated foundations or wet-floodproofing per FEMA guidelines (often $5,000–$15,000 added cost). Hillside lots require geotechnical reports and slope-stability analysis (if the lot is over 15% grade). These are evaluated during plan review; ask Glendale's GIS team upfront if your address is in a special overlay. If yes, budget for a geotechnical engineer report ($2,000–$4,000) and expect plan review to stretch to 90+ days.
Do I need separate insurance for an ADU?
Yes. Your homeowners insurance policy covers the main house but typically excludes a rental ADU (or covers it at a limited rate). You'll need a separate landlord or dwelling-fire policy for the ADU, which costs $500–$1,500 per year depending on the unit's size and location within Glendale. Some insurers offer an endorsement to add the ADU to your main policy; ask your agent. Don't skip this—unpermitted ADUs are not covered, and lenders require proof of insurance before issuing a refinance.
What fees will I pay to Glendale for an ADU permit?
Permit fees are typically 1.5-2% of the project valuation (which Glendale estimates at $150–$200 per sq ft for construction cost). A 400-sq-ft garage conversion is valued at $60,000–$80,000, yielding a permit fee of $1,500–$2,500. A detached 800-sq-ft ADU is valued at $120,000–$160,000, yielding $2,500–$4,000. Add plan-review fees (typically rolled into the permit fee) and design-review deposit ($500–$1,000 if applicable). Utility applications with GWP add $500–$1,500. Total soft costs (permits, utilities, design): $4,000–$12,000 depending on project type.