Prefab ADUs in Saratoga
Saratoga homeowners permitted more ADUs in 2025 than ever — big lots, top schools and some of the highest rents in California. 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, fire zone & access · reply with a fixed price
Licensed builder · Our own factory in Lathrop, CA
Real homes we build, start to finish
Quick answer
ADUs in Saratoga — key facts for 2026
Most Saratoga homeowners can add a detached ADU of up to 1,200 sq ft, with no impact fees under 750 sq ft. ADU permits hit a record 119 in 2025, and 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 Saratoga?
- Yes. A single-family lot can add one detached ADU up to 1,200 sq ft (800 sq ft is always allowed), with 4-ft side and rear setbacks, plus an attached ADU and JADUs.
- Do I need parking?
- One uncovered space, unless you're within half a mile of transit. A garage you convert doesn't need replacing.
- What fees does Saratoga charge?
- No city impact fees under 750 sq ft. School fees (about $2.36 per sq ft for LGSUHSD + Saratoga Union) apply only from 500 sq ft.
- How much does a prefab ADU cost in Saratoga?
- Bay Modular: $124,900–$271,900 all-in, the same price as anywhere in California, permits and installation included.
- What about wildfire zones?
- Hillside lots in Saratoga's wildland-urban interface need fire-resistant construction, defensible space and County Fire review of access and water.
- What does an ADU rent for in Saratoga?
- Average asking rent in Saratoga was $6,340 a month in August 2026 (Zillow, mostly houses); HUD's 2027 fair rent for a 2-bedroom in the area is $3,272.
Sources: HCD APR 2025, City of Saratoga ADU page (SMC 15-56), Saratoga Fire Prevention & WUI pages, LGSUHSD, Saratoga USD, Zillow ZORI Aug 2026. Last reviewed October 2026.
Saratoga in numbers
Saratoga had its biggest ADU year yet
119 ADU permits in 2025 — a record — and more than half of all new homes permitted in the city.
ADU permits issued in the City of Saratoga
Source: California HCD Annual Progress Report data (Table A2), City of Saratoga, permits issued per year. Percent = ADUs among all housing units permitted in the city that year.
average Saratoga asking rent since January 2021 ($4,468 → $6,340)
Zillow Observed Rent Index, City of Saratoga, Aug 2026more ADU permits in 2025 than in 2024 (74 → 119)
HCD APR data, 2024–2025Can I build in Saratoga?
Most Saratoga lots with a house can add an ADU
Saratoga’s ADU rules (SMC 15-56) are generous on size; hillside fire zones add a few steps. Here is what matters for most homeowners:
Up to 1,200 sq ft; 800 sq ft is always allowed regardless of floor-area limits. All our models fit.
4 ft from side and rear lot lines; 16 ft tall inside the setback, 18 ft outside it or near transit.
One detached ADU plus an attached ADU and JADUs on a single-family lot. No owner-occupancy rule for the ADU.
One uncovered space unless near transit; the ADU normally shares the main home's driveway and matches its colors.
Hillside lots in the WUI need ignition-resistant construction, defensible space and County Fire review of access and water.
On lots of 10,000 sq ft+, a below-market-rent ADU gets +10% floor area and waived planning and building fees.
Based on the City of Saratoga ADU page (SMC 15-56.020), Fire Prevention and Building-in-a-Fire-Zone pages and the 2026 WUI map (Oct 2026). Not legal advice — rules depend on your exact lot. More in our city 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 Saratoga
What an ADU costs in Saratoga
Same all-in price as anywhere in California. Our models are all under 750 sq ft, so none pays Saratoga 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 | $1,510 | $0 |
Sources: City of Saratoga ADU page; LGSUHSD developer fees (Jun 2026); Saratoga USD developer fees (Jul 2024); Gov. Code §66311.5. Launch pricing runs through December 31, 2026. Comparison is general — every project differs.
Renting in Saratoga
Renting out an ADU in Saratoga
average asking rent in Saratoga (mostly houses) — up 42% since 2021. HUD's 2027 fair rent for a 2-bedroom in the area is $3,272.
Zillow Observed Rent Index, City of Saratoga, Aug 2026 · HUD FY2027 FMR ADU for rental incomeSaratoga prohibits rentals of 30 days or less — plan on long-term tenants.
A new ADU is exempt from California's statewide rent cap (AB 1482) for 15 years after its certificate of occupancy.
A Saratoga ADU can be rented but generally not sold separately (only to a qualifying low/moderate-income buyer or nonprofit).
Same money, other options
Yearly income per dollar, before taxes and costs. An ADU wins because you already own the land. Full comparison →
Sources: City of Saratoga ADU and Short-Term Rentals pages (Oct 2026); Civil Code §1947.12. Comparison: HUD FY2027 2-bedroom Fair Market Rent, San Jose-Sunnyvale-Santa Clara area ($3,272) × 12 ÷ $271,900; U.S. Treasury (Oct 6, 2026); FTSE Nareit (Sep 2026); Zillow ZORI ÷ ZHVI, San Jose metro (Aug 2026); FDIC (Sep 2026). Not legal or investment advice.
Permits in Saratoga
How your Saratoga permit works — we handle it
Free lot check
Zoning, fire zone, driveway access, hydrants, sewer and power for your Saratoga address.
Plans & submittal
Our HCD-approved plans plus your site plan, submitted to the City of Saratoga.
City & fire review
Building review; WUI lots add a County Fire plan review (access, water, defensible space). We handle comments.
Decision in 60 days
State law requires a decision on a complete 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 City of Saratoga ADU and Building-in-a-Fire-Zone pages (Oct 2026), Santa Clara County Fire standard D-1 and Gov. Code §66317.
Why now
Start your Saratoga 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.
Saratoga ADU questions
Read our city ADU guides, see all of California, or call (209) 214-6845.
Can I build an ADU on my lot in Saratoga?
Most Saratoga single-family lots can add one detached ADU up to 1,200 sq ft with 4-foot side and rear setbacks, plus an attached ADU and JADUs. Hillside fire-zone lots have extra steps — we check your address for free.
How much does an ADU cost in Saratoga?
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. Saratoga charges no impact fees under 750 sq ft; school fees apply only from 500 sq ft.
How long does an ADU permit take in Saratoga?
State law requires a decision on a complete application within 60 days; fire-zone lots also need County Fire review. 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 Saratoga?
One uncovered space, unless the lot is within half a mile of public transit. A converted garage doesn't need replacing.
Can I build an ADU in a Saratoga fire zone?
Usually yes. Lots in the wildland-urban interface need ignition-resistant construction, defensible space, enough fire flow and safe driveway access; we check these during the free lot check.
Can I rent my Saratoga ADU on Airbnb?
No. Saratoga prohibits rentals of 30 days or less.
Can I sell my ADU separately in Saratoga?
Generally no — only to a qualifying low- or moderate-income buyer or a nonprofit. You can rent it out.
Is an ADU a better investment than a rental property in Saratoga?
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 ($3,272) earns about 14.5% a year on its price before costs, vs. about 3% for a typical San Jose-area rental home (Zillow, Aug 2026). Not investment advice.
Free · no obligation
Can you build an ADU on your Saratoga lot?
Send your Saratoga address. We'll check zoning, setbacks, easements 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 Saratoga, 2021–2025, updated Oct 2026); Zillow Observed Rent Index, City of Saratoga (Aug 2026); HUD FY2027 Fair Market Rents; City of Saratoga ADU, Short-Term Rentals, Fire Prevention and Building-in-a-Fire-Zone pages; 2026 WUI map; LGSUHSD and Saratoga USD developer fees; Civil Code §1947.12; HCD ADU Handbook (2026). General information, not legal or investment advice. Updated October 2026.