Local permit rules, fees, and timelines for Monterey Park, verified against city sources, plus the loan options NestMade matches to your equity and the rent your unit can earn.
San Gabriel Valley ADU Loans
An accessory dwelling unit adds rental income, room for family, and value to your Monterey Park property. The local details below — each checked against its city source — shape what you can build under California's ADU law and what it costs, alongside loan options matched to your equity and timeline.
The Numbers
Monterey Park home values support the equity an ADU loan draws on, and local rents shape whether the unit pays for itself.
The median value of owner-occupied homes in Monterey Park is about $863,000, so most owners hold meaningful equity to borrow against.
HUD's revised FY2026 Fair Market Rent for the Los Angeles County metro, which covers Monterey Park, is $2,079 for a studio, $2,328 for a one-bedroom, and $2,903for a two-bedroom. Fair Market Rent is HUD's 40th-percentile gross rent, so a newly built ADU often asks somewhat higher.
What You Can Build
What the city allows on a single-family lot, checked against the local ordinance and state law.
Per the City's ADU Development Standards (Chapter 21.50): a DETACHED ADU is capped at 1,200 sqft. An ATTACHED ADU is limited to 50% of the primary dwelling's floor area or 800 sqft, whichever is greater. A JADU is limited to 500 sqft of interior space. State law also overrides any local cap below 800 sqft: ADUs less than 800 sqft must be allowed, and the City may not impose local planning requirements on ADUs 800 sqft or smaller. Maximum height is 16 ft for a detached ADU (increasable to 18 ft within a half-mile of a major transit stop or high-quality transit corridor, or on a lot with a multifamily/multistory dwelling, per GOV §66321(b)(4)) and 25 ft for an attached ADU.
For attached and detached ADUs, the City's ADU Development Standards apply the Design Criteria of MPMC § 21.08.080 Development Standards(J): the ADU must be architecturally compatible with the primary building in terms of color, materials, roof type and pitch, and scale. JADUs and converted ADUs use the existing structure's design. These standards do not apply to ADUs 800 sqft or smaller, on which the City may not impose local planning requirements.
The City's ADU Development Standards set ADU/JADU side and rear setbacks at 4 ft each but do not impose a separate ADU front setback; existing setbacks apply, and a converted ADU must maintain existing setbacks if built in the same location. The standards table also specifies building-separation distances (habitable to non-habitable 5 ft; habitable to habitable 10 ft on the first floor and 11 ft on the second floor). No ADU-specific landscaping requirement is listed.
On a single-family (R-1) lot, the City's ADU Number Permitted handout allows 1 ADU plus 1 JADU (whether the ADU is interior-converted or newly built/detached). For multifamily dwellings, interior conversions allow at least 1 ADU up to 25% of existing units; newly built or detached ADUs are limited to up to 8 on an existing multifamily building (not exceeding the number of existing units), and up to 2 on a proposed multifamily building. The single-family allowance follows the baseline state framework (Gov. Code §§66310-66342) of one ADU plus one JADU per single-family lot; it is not the larger 3-ADU/multi-unit allowance that applies to multifamily lots.
Costs
What the city and school district charge, and where ADUs get a break.
Monterey Park has no flat ADU permit fee; building fees are valuation-based per the Building and Safety Plan Check and Permit Fees schedule. The Building Permit Fee Schedule (effective 07/01/2025) sets the Building Permit Fee at $100,000 valuation at $2,247.53, plus $13.30 for each additional $1,000 of valuation (or fraction thereof) above $100,000 (e.g., a $150,000 ADU build is roughly $2,247.53 + 50 × $13.30 = $2,912.53). The Building Plan Check Fee equals 81.2% of the Building Permit Fee (≈ $2,365 on that example), with a $280.41 minimum plan-check fee per trade; plan-revision-after-permit work is billed at $145.47/hour (0.5 hr min). Building Issuance Fees are $66.88 for one trade and $50.17 for each additional trade. Separate plan-check/permit fees apply for electrical, plumbing, mechanical (each with its own fee schedule, plan check = 81.2% of permit fee, $280.41 min), plus energy and accessibility ($103.32/ksf permit where applicable). Add-on charges on all building permits include a 0.1% Plans Archival/Records Management fee, a 0.2% General Plan Revision Surcharge, plus the State Strong Motion (SMIP) tax (0.013% residential / 0.028% non-residential of valuation, $0.50 min) and the State CALGreen building-standards fee (tiered, $4 at $100k valuation, +$1 per $25k above).
Monterey Park's Development Impact Fee (effective 07/06/2021, in the Plan Check and Permit Fees schedule) is $12,387 per detached dwelling unit and $11,324 per attached dwelling unit (commercial lodging $3,434/unit; retail/service/office $4.906/sq ft; manufacturing/industrial $1.862/sq ft; institutional $1.789/sq ft). Per the schedule, 'Single Family House additions, alterations, and ADU under 750 sq. ft. are exempt.' So an ADU of 750 sq ft or larger pays the City Development Impact Fee ($12,387 detached / $11,324 attached). School developer fees are levied by the school district, not the City — the fee schedule lists four district offices to contact for the fee: Alhambra School District (626) 308-2200, Garvey School District (626) 307-3456, Los Angeles School District (213) 743-3670, and Montebello School District (323) 887-3044. The schedule shows no City-set school-fee dollar amount; residential additions of 500 sq ft or less may not be subject to school fees but must be registered with the district for permit clearance. Under state law, ADUs under 500 sq ft of assessable space are exempt from school developer fees and districts may charge them on ADUs 500 sq ft or larger.
Process
How long it takes, and the shortcuts the city offers.
Yes. Monterey Park runs a Designer-Owned Pre-Approved ADU Program launched in response to state ADU law changes. As of June 2026, four detached-ADU plan sets are approved and available; plans are roughly 70% complete for permitting, and property owners hire the approved designer (currently Michael Zhang of ALiGCUS Construction) to finalize and customize them and secure the building permit. The City is reviewing additional designer submissions through the Building Division.
An ADU/JADU requires Planning Approval, Plan Check, and a Building Permit per the City's ADU Development Standards. Applications and forms are submitted by email to PlanningPermitCounter@MontereyPark.Ca.GOV (printed forms also available in person at City Hall); there is no online self-service permitting portal documented. Planning requires a recorded covenant as part of planning clearance, and short-term rental of an ADU/JADU is prohibited. Separate utility billing requires a separate electrical panel, gas meter, and water meter coordinated with the Building Division and Public Works. The Pre-Approved ADU Program is the documented expedited track, intended to speed approval and reduce permit costs.
Watch-outs
A few local specifics that can affect where and whether you build.
No part of the City of Monterey Park is mapped as a Very High Fire Hazard Severity Zone. A spatial check of the official CAL FIRE/OSFM Local Responsibility Area Fire Hazard Severity Zone data against the city's boundary returns no Very High zones within the city limits, including across its hilly areas (Monterey Hills/Highlands and the slopes near the 60 freeway); the nearest Very High zones lie in the Puente Hills and San Gabriel foothills outside the city. Monterey Park is a built-out urban Local Responsibility Area jurisdiction, and its ADU standards impose no fire-hazard-zone or hillside-overlay requirement on ADUs.
Monterey Park is served by a citywide municipal sanitary sewer system: a gravity-flow network of about 126 miles of main-line sewers and roughly 2,498 manholes that connects to Los Angeles County Sanitation Districts trunk lines and conveys more than two billion gallons of wastewater per year. No septic-system areas are identified by the City, so ADUs connect to sewer and a percolation test is not a general requirement.
No. Monterey Park has not opted into AB 1033. No city ordinance or Council action authorizing separate condominium sale of an ADU (AB 1033, Gov. Code § 66342) was found as of 2026. The city's ADU regulations (Municipal Code Chapter 21.50) contain only Definitions, Certificate of Occupancy, Address Number, and Fees sections — none authorizing separate sale — and its ADU standards require a recorded covenant and prohibit short-term rental, reflecting the default rule that an ADU may not be sold separately. AB 1033 is opt-in only and takes effect in a city only after that city adopts a local ordinance; Monterey Park is not among the handful of California jurisdictions that have done so.
Know Your Numbers
Pick your project and size for a quick, itemized estimate, then see whether to pay cash or finance it. Permit fees vary by city — the Monterey Park specifics are in the fees section above.
1 What do you want to build?
2 How big?
3 Your estimated cost in Monterey Park
Does it pencil?
The rent could fully cover the loan payment — about $1,140/mo left over.
Financing $154,000 at 8.5% over 30 years (illustrative). Potential rent is the HUD Fair Market Rent for LA County — your actual rate and rent will vary.
4 How will you pay for it?
Ballpark ranges based on 2025–26 Los Angeles–area ADU costs, not a quote. Your actual cost depends on your lot, finishes, site conditions, and city. Exact Monterey Park permit fees vary — see the fee details on this page. A NestMade advisor will give you real numbers for your project.
Information last verified June 2026 against official Monterey Park and California state sources.
The permit rules, fees, timelines, and figures on this page are provided for general informational purposes only and are not legal, tax, financial, or lending advice. Local ordinances and fee schedules change frequently, and your property's specifics may differ. Confirm current requirements directly with the City of Monterey Park and do your own research with the appropriate licensed professionals before making decisions about your ADU. Cost figures are estimates; loan options are subject to credit approval and are not a commitment to lend.
San Gabriel Valley
ADU rules and fees differ from one city to the next. Explore the guidance for a nearby city, or see them all.
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