Prefab ADUs in Pasadena
Pasadena waives its residential impact fee on ADUs up to 900 sq ft and halves plan-check fees — and rents here are up 31% since 2021. We deliver an all-in prefab ADU from our factory in Lathrop — permits, foundation, delivery and installation included — at one fixed price.
Free lot check · zoning, setbacks, utilities · reply with a fixed price
Licensed builder · Our own factory in Lathrop, CA
Real homes we build, start to finish
Quick answer
ADUs in Pasadena — key facts for 2026
Most Pasadena homeowners can add a detached ADU — 800 sq ft is always allowed, up to 1,200 sq ft under local standards — with no Residential Impact Fee up to 900 sq ft and no parking near transit. Bay Modular delivers a factory-built ADU all-in for $124,900–$271,900 — the same price anywhere in California.
- Can I build an ADU in Pasadena?
- Yes, on most lots with a single-family home. A detached ADU of up to 800 sq ft and 16 ft with 4-ft side and rear setbacks is always allowed; larger ADUs up to 1,200 sq ft follow local standards.
- How long does a Pasadena ADU permit take?
- ADUs are approved ministerially through the City's permit portal; state law requires a decision within 60 days of a complete application.
- What fees does Pasadena charge?
- No Residential Impact Fee for ADUs up to 900 sq ft, plus a 50% plan-check discount and reduced permit taxes on single-family sites. School fees apply only over 500 sq ft.
- How much does a prefab ADU cost in Pasadena?
- Bay Modular: $124,900–$271,900 all-in, the same price as anywhere in California, permits and installation included.
- How many ADUs does Pasadena build?
- 222 ADU permits in 2025 and 931 from 2021 to 2025.
- What does an ADU rent for in Pasadena?
- Average asking rent in Pasadena was $3,022 a month in August 2026 (Zillow), up 31% since January 2021.
Sources: HCD APR 2025, Pasadena Ordinance No. 7420 (May 2024) and the City’s ADU page, Zillow ZORI Aug 2026. Last reviewed October 2026.
Pasadena in numbers
Pasadena keeps building ADUs
Pasadena issued 931 ADU permits from 2021 to 2025 — about 200 a year since 2022, and 222 in 2025.
ADU permits issued in the City of Pasadena
Source: California HCD Annual Progress Report data (Table A2), City of Pasadena, permits issued per year. Percent = ADUs among all housing units permitted in the city that year.
average Pasadena asking rent since January 2021 ($2,308 → $3,022)
Zillow Observed Rent Index, City of Pasadena, Aug 2026ADU permits issued in Pasadena in five years (2021–2025)
HCD APR data, 2021–2025Can I build in Pasadena?
Most Pasadena lots with a house can add an ADU
Pasadena’s ADU rules (Ordinance No. 7420, in effect since May 20, 2024) follow state law with local details. Here is what matters for most homeowners:
A detached ADU of up to 800 sq ft is always allowed; up to 1,200 sq ft under local standards — all our models fit.
4 ft from side and rear lot lines and 16 ft tall for the always-allowed ADU; larger ADUs follow the City's local standards.
One space — but none within half a mile walking of transit, in historic districts, near car share, or inside existing space. The ADU shares your driveway.
ADUs are allowed in historic districts; a detached one must not be visible from the street.
No Residential Impact Fee up to 900 sq ft, 50% off plan check and reduced permit taxes on single-family sites.
ADUs can't be rented for less than 30 days — plan on long-term tenants.
Based on Pasadena Ordinance No. 7420 and the City’s ADU page. Not legal advice — rules depend on your exact lot. More in our ADU guides.
New in 2027: under AB 956 (Chapter 791, Statutes of 2026), from January 1, 2027 state law lets you build two detached ADUs on a lot with a single-family home, and HOA rules can’t block an ADU on a lot zoned to allow one.
Costs & fees in Pasadena
What an ADU costs in Pasadena
Same all-in price as anywhere in California. Our models are all under 750 sq ft, so none pays impact fees — and four of five pay no school fees.
| Model | All-in price | School fees | City impact fees |
|---|---|---|---|
| Backyard Studio120 sq ft · home office or guest studio, not a rentable ADU | $75,900 | $0 | $0 |
| Small Studio256 sq ft | $124,900 | $0 | $0 |
| Large Studio ADU320 sq ft | $154,900 | $0 | $0 |
| 1 Bedroom ADU480 sq ft | $214,900 | $0 | $0 |
| 2 Bedroom ADU640 sq ft | $271,900 | $3,443 | $0 |
Sources: Gov. Code §66311.5; Ed. Code §17620 and State Allocation Board 2026 school fee maximum; City of Pasadena ADU page (Reduced Fees and Impact Fees, 2025). Launch pricing runs through December 31, 2026. Comparison is general — every project differs.
Renting in Pasadena
Renting out an ADU in Pasadena
average asking rent for all homes in Pasadena — up 31% since 2021. HUD's 2027 fair rent for a 2-bedroom in the area is $2,964.
Zillow Observed Rent Index, City of Pasadena, Aug 2026 · HUD FY2027 FMR ADU for rental incomePasadena ADUs can't be rented for less than 30 days — plan on long-term tenants.
A 7-year Landlord Agreement or affordability covenant can waive more fees — optional, not required for a permit.
A new ADU is exempt from California's statewide rent cap (AB 1482) for 15 years after its certificate of occupancy.
Same money, other options
Yearly income per dollar, before taxes and costs. An ADU wins because you already own the land. Full comparison →
Sources: Pasadena Ordinance No. 7420 and City ADU page (Housing Agreements); Civil Code §1947.12. Comparison: HUD FY2027 2-bedroom Fair Market Rent, Los Angeles-Long Beach-Glendale area ($2,964) × 12 ÷ $271,900; U.S. Treasury (Oct 6, 2026); FTSE Nareit (Sep 2026); Zillow ZORI ÷ ZHVI, LA metro (Aug 2026); FDIC (Sep 2026). Not legal or investment advice.
Permits in Pasadena
How your Pasadena permit works — we handle it
Free lot check
Zoning, historic status, transit distance, sewer and power for your Pasadena address.
Plans & submittal
Our HCD-approved plans plus your site plan, filed in the City's CSS Permit Portal; optional virtual pre-meeting with City staff.
City review
Ministerial plan check with ADU fee reductions applied; we answer comments.
Decision in 60 days
State law requires a decision on a complete ADU application within 60 days. Your ADU is built in our factory meanwhile.
Install & move in
Delivered from our Lathrop factory, installed in about a week, inspected, then your Certificate of Occupancy.
Based on the City of Pasadena ADU page, Ordinance No. 7420 and Gov. Code §66317.
Why now
Start your Pasadena ADU with zero risk
Lock in launch pricing, see exactly what you get, and only decide once you have a fixed price for your lot.
All-in from $75,900 — everything included
- Backyard Studio (home office)$75,900All-in · fixed in writing
- Small Studio$124,900All-in · fixed in writing
- Large Studio ADU$154,900All-in · fixed in writing
- 1 Bedroom ADU$214,900All-in · fixed in writing
- 2 Bedroom ADU$271,900All-in · fixed in writing
Zero-risk start
- Free lot check & quoteNo obligation, no credit card.
- One fixed all-in priceDesign, permits, delivery and install — one number.
- HCD-approved plansState approval #1585366, financed and appraised like a home.
- 2-year warrantyOn materials and workmanship.
Visit our factory in Lathrop, CA and walk through a finished ADU.
Pasadena ADU questions
Read our ADU guides, see all of California, or call (209) 214-6845.
Can I build an ADU on my lot in Pasadena?
Most Pasadena lots with a single-family home can add a detached ADU. One of up to 800 sq ft and 16 ft with 4-foot side and rear setbacks is always allowed; larger ADUs up to 1,200 sq ft follow local standards. We check your address for free.
How much does an ADU cost in Pasadena?
Our all-in prices are the same as anywhere in California: from $124,900 for a Small Studio to $271,900 for a 2 Bedroom ADU, with launch pricing through December 31, 2026. No Residential Impact Fee up to 900 sq ft, and school fees only above 500 sq ft.
How long does an ADU permit take in Pasadena?
ADUs are approved ministerially, and state law requires a decision within 60 days of a complete application. Your ADU is built in our factory at the same time, so most projects take 4–6 months from signing to keys.
Do I need parking for an ADU in Pasadena?
One space — but none if you are within half a mile walking of a transit stop, in a historic district, near a car-share location, or converting existing space.
Can I build an ADU in a Pasadena historic district?
Yes. In historic districts a detached ADU is allowed if it isn't visible from the public right-of-way.
Can I rent my Pasadena ADU on Airbnb?
No. Pasadena ADUs can't be rented for less than 30 days.
Can Bay Modular deliver to Pasadena?
Yes. We build in our Lathrop factory and deliver statewide at the same all-in price, including Los Angeles County.
Is an ADU a better investment than a rental property in Pasadena?
For most homeowners with room on their lot, yes: you don't buy land. A 2 Bedroom ADU at HUD's 2027 fair rent for a 2-bedroom in the LA-Long Beach area ($2,964) earns about 13.2% a year on its price before costs, vs. about 3.7% for a typical LA-metro rental home (Zillow, Aug 2026). Not investment advice.
Free · no obligation
Can you build an ADU on your Pasadena lot?
Send your Pasadena address. We'll check zoning, historic status, transit distance and utilities, and send a fixed all-in price — permits included.
HCD-approved plans (#1585366) · 2-year warranty · factory in Lathrop, CA
Sources: California HCD Annual Progress Report data, Table A2 (City of Pasadena, 2021–2025, updated Oct 2026); Zillow Observed Rent Index, City of Pasadena (Aug 2026); HUD FY2027 Fair Market Rents (Los Angeles-Long Beach-Glendale); City of Pasadena Ordinance No. 7420 (2024) and ADU page (fees, parking, historic districts). Prices: Bay Modular, October 2026. Not legal advice.