Local permit rules, fees, and timelines for Monrovia, 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 Monrovia 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
Monrovia 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 Monrovia is about $909,400, so most owners hold meaningful equity to borrow against.
HUD's revised FY2026 Fair Market Rent for the Los Angeles County metro, which covers Monrovia, 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.
Under Monrovia Municipal Code 17.44.005, a ministerial 'Building Permit Only' detached ADU is capped at 800 sq ft with 4-ft side/rear setbacks and 16-ft height; under Planning Division Review a detached ADU may reach 1,000 sq ft and an attached ADU may not exceed 50% of the existing home's floor area (min 220 sq ft). A JADU is 220–500 sq ft within the existing single-family dwelling. State law (Gov. Code §66321) independently guarantees up to 850 sq ft (studio/1-BR) or 1,000 sq ft (2+ BR).
For ADUs going through Planning Division Review, MMC 17.44.005(D)(2)(f) requires the ADU to match the primary dwelling's design, architectural style, colors, siding, roofing, and window materials; ADUs and JADUs must have independent exterior access. Ministerial 'Building Permit Only' ADUs are not subject to discretionary design-matching beyond size/setback/height limits. Historic-landmark or historic-district properties carry added facade/materials-matching standards (D)(2)(e).
Monrovia does not allow a new ADU between the primary dwelling and the street, except where that rule would prevent an 800 sq ft / 16-ft ADU with 4-ft side/rear setbacks (MMC 17.44.005(D)(2)(b)). No added setback is required for an ADU converted from, or built in the footprint of, an existing structure; otherwise side and rear setbacks are 4 ft. There is no ADU-specific front-yard landscaping mandate; front-yard parking is limited to the driveway and to 25% of the front yard.
On a single-family lot Monrovia permits one ADU plus one JADU (one attached JADU plus one detached 800 sq ft ADU) under MMC 17.44.005(B). California law (Gov. Code §66323) independently entitles a single-family lot to one detached ADU, one converted ADU, and one JADU. On multifamily lots the city allows conversions of non-livable space up to 25% of existing units plus two detached ADUs.
Costs
What the city and school district charge, and where ADUs get a break.
Monrovia building permit and plan-check fees for an ADU are valuation-based and set by City Council resolution via the adopted Schedule of Fees and Charges; there is no flat ADU fee. A detached ADU's cost is a valuation-keyed building permit fee plus plan-check fee, in addition to utility and school fees. The city's Building Division (building@monroviaca.gov) confirms exact amounts at submittal.
MMC 17.44.005(E)(1) makes ADU owners subject to applicable sewer, water, and impact fees except as limited by state law (no impact fees on ADUs under 750 sq ft; proportional for larger), and expressly exempts ADUs and JADUs from city traffic impact fees. School developer fees are levied by Monrovia Unified School District at $4.79/sq ft residential (2022 study). Under SB 543 (eff. 2026), ADUs/JADUs under 500 sq ft are exempt from school fees.
Process
How long it takes, and the shortcuts the city offers.
Yes. Monrovia operates a Pre-Approved ADU Plan Program under AB 1332 (Gov. Code §65852.27). The City maintains a catalog of plan sets pre-reviewed for state and local compliance; a homeowner selects a listed plan and works with the listed designer on a site-specific layout, which shortens permit review. The City also publishes a submission guide for designers who want their plans pre-approved and listed.
Monrovia uses two tracks: a ministerial 'Building Permit Only' process for conversion ADUs, JADUs, and detached new-construction ADUs up to 800 sq ft (MMC 17.44.005(D)(1)), and a 'Planning Division Review' track for ADUs exceeding those standards (D)(2). Both are reviewed at staff level. Applicants submit a Plan Check Application and ADU Permit Application to the Building Division; using a city pre-approved plan shortens review. State law sets a 60-day ministerial decision once the application is complete.
Watch-outs
A few local specifics that can affect where and whether you build.
Yes on both. Monrovia's northern foothills (the wildland interface north toward the Hillside Wilderness Preserve) lie in a Very High Fire Hazard Severity Zone; the City adopted the updated CAL FIRE/OSFM LRA maps by ordinance in 2025, and ADUs in these zones trigger Wildland-Urban Interface (CBC Chapter 7A) construction and defensible-space requirements. Monrovia also has designated historic districts and 140+ landmarks: an ADU on a listed/landmark property or historic-district contributor must not alter the street-facing facade and must match existing materials (MMC 17.44.005(D)(2)(e)).
Monrovia's ADU code anticipates septic on some lots: MMC 17.44.005(E)(3) requires, if an ADU connects to an onsite (septic) system, documentation that a percolation test was completed and certified within the last five years (or recertified within ten years). Otherwise ADUs draw water and sewer from the primary dwelling's connections. The perc-test provision is the operative trigger for the lower-density hillside north end; the city publishes no parcel-level sewer-vs-septic map.
No. Monrovia has not adopted an AB 1033 ordinance. AB 1033 is permissive — it lets, but does not require, a city to allow an ADU to be sold separately as a condominium. Monrovia instead requires a recorded covenant that an ADU/JADU shall not be sold or conveyed separately from the primary residence (MMC 17.44.005(C)(8)(a)). No separate-conveyance/condominium provision has been added, so treat Monrovia as not opted in.
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 Monrovia specifics are in the fees section above.
1 What do you want to build?
2 How big?
3 Your estimated cost in Monrovia
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 Monrovia 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 Monrovia 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 Monrovia 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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