Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
Permit required for every ADU type in Maywood — detached new construction, garage conversions, junior ADUs, and above-garage units. California state law (AB 881, Government Code 65852.22) mandates that cities approve qualifying ADUs even if local zoning historically prohibited them.
Maywood, like all California cities, must honor state ADU law — meaning the city cannot reject an ADU solely on zoning grounds if it meets state eligibility criteria (size, setbacks, parking waivers, owner-occupancy waiver). However, Maywood still processes permits locally, and the city applies its own plan-review standards, fee schedules, and timeline discipline. Maywood's 60-day permit review clock (per AB 671) is shorter than many neighboring cities in LA County, which matters if you're comparing Maywood to Bell Gardens or Huntington Park. The city's biggest local wrinkle: Maywood sits in a high fire-hazard zone (CalFire Very High Fire Hazard Severity Zone), which triggers additional defensible-space documentation and may require fire-resistant roofing and eaves in your ADU design — a requirement that doesn't burden all LA County cities equally. Additionally, Maywood has strict setback rules for detached ADUs on small infill lots typical of this community; state law lets you shrink those setbacks, but the city's staff will need explicit state-law citations in your application to approve reduced-setback ADUs. Owner-builder permits are allowed in California, though electrical and plumbing must be done by licensed trades (you can pull the ADU permit yourself, hire subs for licensed work).

What happens if you skip the permit (and you needed one)

Maywood ADU permits — the key details

California Government Code 65852.22 and 65852.2 (amended by AB 881, effective January 1, 2023) mandate that Maywood approve ADUs that meet state eligibility thresholds, regardless of what the local zoning code says. An ADU is eligible if it is a new structure or a conversion (garage, attic, or existing accessory building) not exceeding 800 square feet for a one-bedroom or 1,000 square feet for two bedrooms; the lot is zoned residential; and the property contains an existing dwelling unit. A junior ADU (an internal conversion of part of the primary home, like a second kitchen and separate entrance carved from an existing bedroom) has a 500-square-foot cap. Maywood cannot impose owner-occupancy requirements on ADU properties, cannot mandate lot-size minimums beyond what state law allows (state law is generous here), and cannot charge affordable-housing impact fees that exceed what the city charges for comparable new housing. However, state law does not prohibit Maywood from charging reasonable permit and plan-review fees, nor does it waive setback, height, and design requirements — those are left to local discretion, provided the city does not use them as a backdoor to ban ADUs. In practice, Maywood's planning staff will ask for setback calculations, fire-resistant roofing documentation (due to the fire-hazard zone), utility sub-meter plans, and parking acknowledgment (though state law waives parking requirements for ADUs in many circumstances, Maywood may still ask you to address it in your site plan).

Maywood sits in California Fire Hazard Severity Zone (CFHSZ) — Very High risk per CalFire. This means your ADU design must incorporate defensible space (cleared vegetation within 100 feet of the structure) and may require fire-resistant roofing (Class A rating, metal or asphalt shingle with high fire-rating), non-combustible eaves, and dual-pane tempered windows. These are not minor cosmetics; a metal roof vs. a standard shingle adds $2,000–$4,000 to a typical ADU build. Maywood Building Department staff will flag this during plan review if your architectural drawings do not show CalFire-compliant materials. If you live in an adjacent non-fire-zone city (like Cudahy), these upgrades may not be required — so Maywood's fire-hazard designation is a genuine local cost lever. You must submit a fire-resistant materials schedule with your permit application; if you omit it, expect a round of resubmittals adding 1–2 weeks to your timeline.

Maywood's standard ADU setback requirement is 5 feet from side and rear property lines for detached structures; state law allows the city to impose setbacks no greater than 5 feet, and Maywood is at the state ceiling. However, AB 881 explicitly allows reduced setbacks — down to zero feet in some cases — if the ADU meets certain design or density thresholds. If your lot is small (say, 4,000 square feet) and you need a tighter footprint, cite Government Code 65852.22(d)(2) in your narrative and show that the ADU is consistent with the existing neighborhood setback pattern. Maywood's planning staff has seen this language before; they will review it. On lot-size minimums, Maywood has no explicit minimum-lot requirement for ADUs, which aligns with state law. However, the city's utility and fire-access codes will scrutinize very small infill sites; a 40-foot-wide lot with an existing home and a proposed detached ADU will require a fire-access turnaround or driveway width confirmation. Detached ADUs also trigger foundation and grading inspections under IRC R401–R408; if your soil is expansive clay (common in parts of LA County but less common in Maywood's coastal-influenced neighborhoods), the city will require geotechnical soil testing and engineering, adding $800–$2,000 and 2–3 weeks.

Utility service and sub-metering is a major plan-review focal point in Maywood ADU permits. The city will require separate electrical service and separate water/sewer utility accounts for a detached ADU; for a garage conversion or junior ADU, sub-metering (a sub-panel and water meter within the primary meter) is often acceptable, but Maywood's municipal utility department (which handles water and sewer) may have its own rules. You must coordinate with both the building department and the utilities division; many applicants miss this step and get delayed. Electrical service requires a permit from the building department and approval from Southern California Edison (SCE); water/sewer sub-meter approval comes from Maywood Water & Power or the LA County Department of Public Works (depending on which utility serves your address). If your lot has an old meter setup or a shared lateral, expect additional engineering and $1,500–$3,000 in utility work. Request a utility pre-approval letter from Maywood Water & Power before you finalize your ADU site plan; this is a free step that will save you a rejection cycle later.

Timeline and permit processing in Maywood follows the state's 60-day 'shot clock' under AB 671 — the city has 60 days from the date a complete application is deemed submitted to approve or deny an ADU permit (assuming it meets state law). However, 'complete' is a high bar: missing a fire-resistant materials schedule, an unclear utility diagram, or a setback calculation will trigger an incompleteness notice, and the 60-day clock resets. In practice, most Maywood ADU permits are approved within 8–12 weeks if you get your package right on the first submission. Inspection sequence is: foundation (if detached), framing, rough trades (electrical, plumbing, HVAC), insulation/drywall, final building, final electrical (SCE), final utilities (water/sewer sign-off), and planning/fire sign-off. Each inspection must be scheduled 48 hours in advance via the Maywood online portal or by phone. Budget 2–3 weeks of calendar time for inspections once construction starts; they are not always sequential.

Three Maywood accessory dwelling unit (adu) scenarios

Scenario A
Detached 800 sq ft one-bedroom ADU on a 6,500 sq ft residential lot in central Maywood (fire-hazard zone, clay soil, separate driveway access)
You own a modest single-story 1950s bungalow on a rectangular lot with a large rear yard, no existing garage. You want to build a detached 800-square-foot one-bedroom ADU with a separate utility meter, metal roof (fire-compliant), and its own driveway off the alley. Under state law (AB 881), this is presumptively eligible — 800 sq ft, one bedroom, lot is residential, primary dwelling exists. Maywood will issue a permit. Your specific local hurdles: (1) Fire-hazard zone requires Class A metal roofing ($3,000–$4,000 premium), defensive landscaping buffer, and tempered dual-pane windows — these must be called out in your architectural drawings and fire-safety schedule. (2) Soil testing — a modest geotechnical report ($1,200–$1,800) to confirm clay is not critically expansive; Maywood requires engineer sign-off on foundation design if soil PI (plasticity index) is above 20. (3) Utility sub-meter coordination with Maywood Water & Power (2–3 week lead time for a new water meter and sewer lateral; you'll need their written approval before Building Department issues a permit). (4) Detached ADU setback is 5 feet rear, 5 feet side; your lot is wide enough, but confirm property lines with a survey ($400–$600) before you break ground — setback violations are common rejection reasons, and they are very expensive to remedy post-construction. Plan review timeline: 8–10 weeks if you include a soil report, fire schedule, and utility pre-approval letter in your initial submittal. Permit fees: $3,500–$4,500 (building permit + plan review + fire-hazard zone surcharge). Construction timeline: 16–20 weeks for a turnkey 800-sq-ft detached ADU (foundation, framing, trades, finishes, inspections). Total project cost (land + permit + build): $180,000–$280,000 depending on finishes.
Permit required (AB 881 eligible) | Geotechnical soil test $1,200–$1,800 | Fire-resistant roof Class A metal $3,000–$4,000 | Utility sub-meter coordination required | Property survey $400–$600 | Building permit $3,500–$4,500 | Plan review 8–10 weeks | Total hard costs $185,000–$290,000
Scenario B
Junior ADU (internal conversion: second kitchen + separate entrance carved from rear bedroom + hallway) in existing 1,200 sq ft bungalow, Maywood coastal neighborhood, no fire-hazard designation
Your home is a 1,200-square-foot 3-bedroom bungalow in a less fire-prone pocket of Maywood near the northern border. You want to convert the rear bedroom (220 sq ft) plus a 100-sq-ft hallway alcove into a junior ADU with a separate entrance through the side-yard wall and a kitchenette (sink, electric cooktop, microwave, mini-fridge). Total junior ADU footprint: ~320 square feet, well under the 500-sq-ft state cap. A junior ADU is fully compliant with state law and Maywood's local code. Local nuances for this scenario: (1) Egress — the new separate entrance triggers IRC R310 egress requirements; the rear bedroom must have a second egress window (code-compliant transom, 5.7 sq ft minimum opening, sill within 44 inches of floor). This is often overlooked in junior ADU conversions and causes plan-check rejections. (2) Fire-alarm interconnection — because the junior ADU shares the primary structure, California Building Code R314.4 requires both units to have interconnected smoke alarms (hardwired or wireless RF detector, ~$200–$300 parts and labor). (3) Electrical sub-panel — you do not need a separate utility meter for a junior ADU (they share water and sewer), but you will need a sub-panel in the electrical system to allow independent control; this is a relatively cheap upgrade ($400–$800) and often approved by plan review as a 'minor alteration.' (4) Owner-occupancy is not required per state law, but you must declare occupancy intent in your application (owner-occupied or rented). (5) Parking is waived by state law for junior ADUs, so you do not need to show additional parking. This scenario avoids the fire-hazard materials premium and eliminates utility-coordination delays. Plan review timeline: 6–8 weeks (simpler than detached ADU). Permit fees: $1,800–$2,800 (lower valuation, fewer inspections). Construction timeline: 8–12 weeks (interior only, no foundation work, fewer trades). Total cost (permit + build): $35,000–$65,000 depending on kitchenette finishes and whether you hire a general contractor or do some DIY.
Permit required (state junior ADU law) | No separate utility meter required | Egress window upgrade $2,000–$3,500 | Sub-panel installation $400–$800 | Interconnected smoke alarms $200–$300 | Building permit $1,800–$2,800 | Plan review 6–8 weeks | Total costs $40,000–$70,000
Scenario C
Garage conversion to 750 sq ft one-bedroom ADU, existing 2-car detached garage on a 5,000 sq ft lot, owner-builder permit, Maywood high fire-hazard zone
Your detached 2-car garage (750 sq ft) sits 25 feet from the rear of your primary residence. You want to convert it to a one-bedroom ADU with a new entrance, separate electrical service, and a kitchenette. Garage conversions are extremely common ADU candidates in Maywood because garages are abundant and state law fully permits them. Local considerations: (1) Foundation and soils — the existing garage likely has a standard concrete slab-on-grade, built decades ago without engineered design. Maywood will require a soils engineer to certify that the slab is adequate for residential occupancy (which has higher deflection tolerances than a garage). If the garage was built on unstable fill or clay, the engineer may require slab-overlay or reinforcement ($2,000–$4,000). (2) Fire-hazard materials — the existing garage roof must be upgraded to Class A fire rating (metal or high-fire-rating shingle); existing wood siding or fences within 5 feet must be replaced or treated. This is a cost-multiplier in Maywood's fire zone. (3) Egress — a garage conversion must have an operable exit window or door meeting IRC R310.1; if the converted space lacks a second egress, a new egress window ($2,500–$4,000 install) or side-yard door (depends on layout). (4) Utility service — separate electrical service from the main panel or an adjacent pedestal; water and sewer can share the primary meter with a sub-meter for accountability (Maywood Water & Power approval required). SCE will inspect the new electrical service; allow 3–4 weeks for SCE approval. (5) Owner-builder permit — you, the property owner, can pull this permit yourself (no contractor license required). However, electrical work must be done by a licensed electrician (you cannot DIY electrical in California), and plumbing must be done by a licensed plumber or gas fitter. Many owner-builders hire licensed subs for these trades and oversee other work themselves, which is legal and common in Maywood. You will need a seller's permit and a CSLB license just for this project (free to apply, ~$100 filing fee if your project value exceeds $500). Plan review timeline: 8–10 weeks (garage conversions trigger more soils and fire-safety scrutiny than new detached builds). Permit fees: $2,800–$4,200 (plan review + fire-hazard surcharge + electrical/plumbing plan review). Construction timeline: 12–18 weeks (foundation work, roof, siding, electrical, plumbing, interior finishes, inspections). Total cost (permit + build): $120,000–$200,000, depending on slab reinforcement and fire-resistant material upgrades.
Permit required (state garage-conversion law) | Owner-builder allowed (electrical/plumbing must be licensed) | Geotechnical slab assessment $1,500–$2,500 | Fire-resistant roof upgrade $4,000–$6,000 | Egress window or door $2,500–$4,000 | Electrical sub-panel & SCE approval $1,500–$2,500 | Building permit $2,800–$4,200 | Plan review 8–10 weeks | Total costs $125,000–$210,000

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Maywood's fire-hazard zone and ADU design cost implications

Maywood's entire city footprint falls within the California Fire Hazard Severity Zone (CFHSZ) Very High designation per CalFire. This is a significant local fact that directly impacts ADU construction costs in ways that neighboring cities (like Vernon, Cudahy, or Bell Gardens, which have lower fire-risk zones) do not experience. For an ADU, this means your roofing material, eaves construction, and defensible-space landscaping are non-negotiable permit requirements, not optional upgrades. Maywood Building Department will flag missing fire-resistant specifications during plan review, and you will not receive a permit until they are addressed.

The California Building Code and CalFire recommend Class A fire-rated roofing for structures in Very High zones. In practical terms, this means metal roofing (standing-seam or metal shakes, $25–$45 per sq ft, vs. standard asphalt shingle at $8–$15 per sq ft) or engineered asphalt shingle with a UL Class A rating. A typical 800-square-foot ADU footprint (roughly 900 sq ft of roof area) will run $3,000–$4,500 for Class A metal vs. $1,200–$1,800 for standard shingle. Eaves must be non-combustible or enclosed (no open rafter tails or wood beam ends exposed). Windows must be tempered dual-pane or tempered single-pane with tempered glass; single-pane is not code-compliant in the fire zone. These materials are not novel, but they are code-enforced in Maywood in a way they are not in fire-zone-adjacent cities.

Defensible space is a fire-prevention clearance measured 100 feet from the structure; Maywood typically requires you to show (in a site plan or declaration) that vegetation within 100 feet will be maintained at specified clearances (typically 10 feet from the structure for trees, 6 feet for shrubs). If your ADU is on a small infill lot with existing landscaping or property-line fences, you may need to remove or prune trees, which adds cost and timeline. This is not a permit fee; it is an ongoing maintenance obligation. Some ADU applicants in Maywood have found that defensible-space requirements significantly limit their usable rear-yard area, which can reduce the marketability of the ADU (renters want outdoor space). This is a local planning reality worth flagging early with Maywood planning staff.

California ADU state law vs. Maywood local ordinance — what overrides what

California Government Code 65852.22 (AB 881, effective 2023) and 65852.2 (earlier ADU law) create a hierarchy: state-law eligibility trumps local zoning prohibitions, but local design, setback, height, and fee requirements still apply as long as they do not function as a de facto ban. Maywood's local ADU ordinance (or lack thereof, or pre-AB 881 ordinance) is subordinate to state law. This matters in practice because a Maywood resident can cite 'Government Code 65852.22 compliance' to override an older local zoning code that says 'no second dwelling units.' However, Maywood staff can still require that the ADU meet local setback minimums (5 feet rear/side), local height limits (typically 35 feet for single-story neighborhoods), and local architectural compatibility standards (though these must be 'objective' per state law, not subjective design-review discretion).

One practical implication: if you pull an ADU permit in Maywood, you will likely submit your application under 'Government Code 65852.22 ADU' rather than a local 'accessory dwelling unit' category. This flags the application as state-law-eligible and tells Maywood staff that the 60-day AB 671 shot clock applies. If Maywood tries to impose conditions or time delays beyond the 60 days without a valid reason (like incomplete submittal), you have statutory grounds to push back. Many applicants do not know this; they assume the permit timeline is 6 months because their neighbor's garage remodel took that long. State-law ADU applicants should budget 8–12 weeks and cite the shot clock if delays accumulate.

Parking is a common flashpoint. Maywood's old zoning code may require one or two parking spaces per dwelling unit. State law (Government Code 65852.22(f)) waives parking requirements for ADUs in certain circumstances (especially if the lot is near transit, in an infill zone, or in a local parking-waived zone). Maywood must honor the state parking waiver. In practice, Maywood planning staff may still ask you to acknowledge parking in your site plan (e.g., 'Parking: Not required per Government Code 65852.22(f)'), but they cannot deny a permit because the ADU lacks on-site parking. If Maywood tries to impose a parking variance or approval requirement, cite the state law and request a decision letter in writing; this is a common appeal point.

City of Maywood Building & Safety Department
Maywood City Hall, 4319 E. Slauson Avenue, Maywood, CA 90270
Phone: (323) 588-2900 (main); ask for Building & Safety or Building Permits | Maywood online permit portal: maywood.org (or contact building dept. for portal URL and login instructions)
Monday–Friday, 8:00 AM–5:00 PM Pacific (closed city holidays); call or visit in person for permit questions

Common questions

Does California state law really override Maywood's local zoning rules for ADUs?

Yes. Government Code 65852.22 and 65852.2 mandate that Maywood approve ADUs that meet state eligibility criteria (proper size, residential zoning, existing primary dwelling) even if the local zoning ordinance historically prohibited them. However, state law does not eliminate local design, setback, height, or architectural-compatibility standards — it only forbids using those standards as a backdoor ban. If Maywood denies an ADU permit, the city must cite a specific design or code violation, not zoning.

What is the 60-day shot clock, and does it apply to my Maywood ADU permit?

AB 671 mandates that California cities have 60 days from the date a complete ADU application is submitted to approve or deny the permit. Maywood is subject to this timeline. The clock resets if the city issues an incompleteness notice (missing documents, unclear drawings, etc.). In practice, expect 8–12 weeks if your initial submission is thorough; the 60-day clock is a floor, not a ceiling.

Do I have to live in my primary home if I rent out the ADU?

No. California state law removed the owner-occupancy requirement for ADUs as of 2023 (AB 881). Maywood cannot require you to live in the primary home while renting the ADU. You must declare your occupancy intent in the permit application, but you are free to rent both units.

What happens during plan review? How many resubmittals should I expect?

Maywood building staff will review your application for code compliance, fire-safety compliance, utility coordination, setback/height/design conformity, and accessibility (ADA). Common first-round rejections for Maywood ADUs include missing fire-resistant roofing schedules, unclear utility sub-meter diagrams, unaddressed fire-hazard-zone defensible-space, and setback calculations. Budget one resubmittal cycle (1–2 weeks) as a norm; if you anticipate these issues and address them upfront, you may get approved without revision.

Do I need a contractor license to pull an ADU permit in Maywood?

No. California Business & Professions Code § 7044 allows property owners to pull permits for work on their own residential property without a contractor license. However, electrical work must be done by a licensed electrician, and plumbing must be done by a licensed plumber or gas fitter. You can hire licensed subs and oversee other work (framing, drywall, finishes) yourself.

How much will my ADU permit cost in Maywood?

Permit fees for a typical detached ADU in Maywood range $3,000–$4,500 (building permit + plan review + fire-hazard surcharge). A garage conversion or junior ADU may cost $1,800–$2,800. Fees are based on estimated construction valuation (roughly 1.5–2% of total project cost), plus any fire-hazard or fire-inspection surcharges. Request a fee estimate from Maywood Building Department when you submit your application.

Do I need a geotechnical soil report for my Maywood ADU?

Maywood does not universally require soil testing, but the city will ask for it (or foundation engineer sign-off) if your ADU is a detached new structure or a garage conversion on a lot with clay or unknown soil conditions. A basic soil report costs $1,200–$1,800 and typically clears the soil question. If you skip it and soil issues emerge during foundation inspection, you will face expensive remediation. Budget for soil testing if you are not certain of your lot's soil composition.

Are there any pre-approved ADU designs in Maywood that can speed up permitting?

California has pre-approved ADU plans available through the state (CA Department of Housing and Community Development publishes ADU plans), but Maywood does not maintain a local pre-approved plan library. However, if you use a state-approved plan and simply adapt it to your site, plan review may move faster because the state design is already code-vetted. Ask Maywood building staff if they have experience with state ADU plans; some jurisdictions fast-track these.

What inspections are required for a Maywood ADU permit?

Standard ADU inspections include foundation (if detached), framing, rough trades (electrical, plumbing, HVAC), insulation/drywall, final building, final electrical (SCE), and final utilities (water/sewer). Each inspection must be scheduled 48 hours in advance. Plan for 2–3 weeks of calendar time for the inspection sequence once construction starts.

If I convert my garage to an ADU, does my car parking problem have to be solved on-site?

No. Government Code 65852.22(f) waives parking requirements for ADUs, including garage conversions. Maywood cannot require you to add parking spaces elsewhere on your lot or provide off-site parking. If the city asks about parking in plan review, you can simply state 'Parking: Not required per Government Code 65852.22(f).'

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Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current accessory dwelling unit (adu) permit requirements with the City of Maywood Building Department before starting your project.

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