Local permit rules, fees, and timelines for Pasadena, 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 Pasadena 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
Pasadena 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 Pasadena is about $1,093,300, and the local ADU program documents a $1,488,580 2026 program price threshold, so most owners hold meaningful equity to borrow against.
HUD's revised FY2026 Fair Market Rent for the Los Angeles County metro, which covers Pasadena, 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 Pasadena's current ADU ordinance (PMC 17.50.275, as amended by Ordinance No. 7420, adopted April 15, 2024), a newly constructed detached ADU on a single-family lot is capped at 1,200 sq ft. Newly constructed attached ADUs are capped at 850 sq ft for a studio or one-bedroom and 1,000 sq ft for two or more bedrooms. JADUs are capped at 500 sq ft, and the state 'Exemption' detached ADU (ministerially approved at four-foot side/rear setbacks) is 800 sq ft. Conversion ADUs (attached or detached) have no size limit. In the Hillside Overlay Districts (excluding HD-1) the cap tightens: on lots served by streets up to 26 feet wide a new detached ADU is allowed only as an 800 sq ft Exemption ADU and new attached ADUs are not permitted, while on other Hillside lots a new detached ADU is capped at 1,000 sq ft.
Pasadena's current ADU ordinance (PMC 17.50.275, as amended by Ordinance No. 7420) imposes objective standards rather than a roof-pitch/material/color match. Non-exemption ADUs on individually designated historic properties or in Landmark or Historic Districts must not be visible from the public right-of-way (unless that would prevent creating the unit), and detached ADUs in those districts that are visible from the street are held to a lower 16-foot, two-story height limit. New second-story windows are prohibited along interior side and rear lot lines when the setback is under five feet (except where the Building Code requires them for egress). Standard detached ADU height is 18 feet and two stories; a detached ADU within a half-mile walking distance of a Major Transit Stop or High Quality Transit Corridor may add two feet only if needed to match the primary dwelling's roof pitch. Attached ADUs may reach 25 feet and two stories (or the underlying-zone limit, whichever is less).
An ADU must meet the underlying zone's front-yard setback, except 'exemption' ADUs up to 800 sq ft, which are protected by state standards. No ADU-specific landscaping percentage is set, but any mature tree removed for ADU construction must be replaced one-for-one, and units in High Fire Hazard zones require fuel-modification and landscape plans.
Pasadena's local ordinance allows one ADU plus one JADU per single-family lot. HCD found this non-compliant (Feb 26, 2025): state law guarantees one converted ADU, one detached ADU, and one JADU on the same parcel. The state stack controls where the local cap is more restrictive.
Costs
What the city and school district charge, and where ADUs get a break.
Pasadena charges valuation-based building permit and plan-check fees on a tiered schedule (for valuation over $100,000: $1,312 building permit plus $1,966 building plan check on the first $100,000, then $6 permit / $9 plan check per additional $1,000, plus separate Current Planning, Design & Historic, Fire and Public Works plan-check increments). Plan-check fees are reduced 50% for ADUs using the City's Standard Plans Program, covenanted affordable ADUs, Section 8 ADUs, and ADUs for family members. Additional charges include a 1.92% construction tax on valuation, a General Plan Maintenance Fee and a Technology Fee at 0.50% of building permit valuation each (both waived for Standard Plans / covenanted-affordable / Section 8 / family-member ADUs, and reduced 25% for ADUs 900 sq ft or less), a $62 issuance fee, a 3% records-system charge, and a refundable construction-and-demolition deposit set at a flat $1,000 for ADUs on single-family lots.
Pasadena does not levy a stand-alone residential 'impact fee' line item; instead it applies a 1.92% construction tax plus General Plan Maintenance and Technology fees (0.50% of building permit valuation each) to new construction. For ADUs on single-family lots, those General Plan Maintenance and Technology fees are reduced 25% for units 900 sq ft or less and waived entirely for Standard Plans, covenanted-affordable, Section 8, and family-member ADUs. Schools are served by the Pasadena Unified School District, which charges a developer fee of $2.24 per sq ft of floor area on residential construction (commercial/industrial is $0.36 per sq ft), collected at the Permit Center.
Process
How long it takes, and the shortcuts the city offers.
Pasadena published an ADU Standard Plans Program of five pre-reviewed designs: two city prototype plans (Prototype A, a 374 sq ft studio; Prototype D, a 682 sq ft 2-bedroom/1-bath) plus three privately designed plans (ADU 1, 560 sq ft 1BR/1BA; ADU 2, 400 sq ft 1BR/1BA; ADU 3, 750 sq ft 2BR/2BA), spanning 374 to 750 sq ft. The standard plans expired December 31, 2025 due to updates to the California Building Codes; as of January 1, 2026 they may be used only for ADUs on residential properties red-tagged as a result of the Eaton Fire. Modifications to the standard plans are not allowed.
Applications are filed online through Pasadena's MyPermits portal (cityofpasadena.net/mypermits), where homeowners can apply for and submit plans for an ADU without visiting the Permit Center. Before submitting for plan check, anyone considering an ADU can book a complimentary virtual consultation to get preliminary feedback from City staff on building-code and zoning-code requirements for the proposed unit.
Watch-outs
A few local specifics that can affect where and whether you build.
Pasadena's 2025 Very High Fire Hazard Severity Zone map places 4,610 properties in the Very-High zone (up from 3,911 under the prior map). In the Hillside Overlay Districts, the current ADU ordinance (PMC 17.50.275, as amended by Ordinance No. 7420) restricts ADUs by location rather than imposing a single citywide cap: on lots served by streets up to 26 feet wide a new detached ADU is allowed only as an 800 sq ft Exemption ADU and new attached ADUs are not permitted, while on other Hillside lots a new detached ADU is capped at 1,000 sq ft. Hillside, and street-visible Historic-District, detached ADUs are also held to a lower 16-foot, two-story height limit. ADUs on individually designated historic properties or in Landmark or Historic Districts face added visibility constraints (must not be visible from the public right-of-way unless that would prevent the unit).
Pasadena is served citywide by a municipal public sanitary sewer system; there are no general septic-system areas within the incorporated city. The City's sewer network is roughly 328 miles of pipe with about 7,500 manholes and three lift stations, conveying wastewater to the Los Angeles County Sanitation Districts for treatment. New construction, including ADUs, must connect to the public sewer, and a permit is required before constructing or connecting a sewer lateral (Pasadena Municipal Code Chapter 13.24); new septic tanks are prohibited under most circumstances. As a result, perc-test or septic-upgrade requirements do not arise for typical ADU projects in Pasadena. (Some LA County unincorporated 'islands' near Pasadena have historically been on septic, but those are outside the City's jurisdiction.)
Pasadena has not adopted AB 1033. Local code states that an ADU may not be sold separately from the existing single-family home.
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 Pasadena specifics are in the fees section above.
1 What do you want to build?
2 How big?
3 Your estimated cost in Pasadena
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 Pasadena 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 Pasadena 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 Pasadena 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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