Prefab ADUs in Garden Grove
Garden Grove has permitted more ADUs every year since 2021 — and in 2025 two of three new homes in the city were ADUs. 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
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Quick answer
ADUs in Garden Grove — key facts for 2026
Most Garden Grove homeowners can add a one-story detached ADU of up to 1,200 sq ft, with no impact fees under 750 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 Garden Grove?
- Yes, on most residential lots with a house. Garden Grove allows a one-story detached ADU up to 850 sq ft (studio or 1-bedroom) or 1,200 sq ft (2+ bedrooms), 16 ft tall, with 4-ft side and rear setbacks.
- How long does a Garden Grove ADU permit take?
- ADUs that meet the City's standards are approved ministerially; state law requires a decision within 60 days of a complete application.
- What fees does Garden Grove charge?
- No impact fees under 750 sq ft (state law). Garden Grove Unified's school fee applies only to ADUs over 500 sq ft.
- How much does a prefab ADU cost in Garden Grove?
- Bay Modular: $124,900–$271,900 all-in, the same price as anywhere in California, permits and installation included.
- How many ADUs does Garden Grove build?
- 434 ADU permits in 2025 — two of three new homes permitted in the city — and 1,906 since 2021.
- What does an ADU rent for in Garden Grove?
- Average asking rent in Garden Grove was $2,767 a month in August 2026 (Zillow), up 35% since January 2021.
Sources: HCD APR 2025, Garden Grove Municipal Code Ch. 9.54, City ADU handouts and FAQ, Zillow ZORI Aug 2026. Last reviewed October 2026.
Garden Grove in numbers
Garden Grove builds more ADUs every year
ADU permits grew every year, from 267 in 2021 to 434 in 2025 — two of three new homes permitted in Garden Grove last year were ADUs.
ADU permits issued in the City of Garden Grove
Source: California HCD Annual Progress Report data (Table A2), City of Garden Grove, permits issued per year. Percent = ADUs among all housing units permitted in the city that year.
average Garden Grove asking rent since January 2021 ($2,047 → $2,767)
Zillow Observed Rent Index, City of Garden Grove, Aug 2026ADU permits issued in Garden Grove in five years (2021–2025)
HCD APR data, 2021–2025Can I build in Garden Grove?
Most Garden Grove lots with a house can add an ADU
Garden Grove’s ADU rules (Municipal Code Ch. 9.54) add a few local details to state law. Here is what matters for most homeowners:
Up to 850 sq ft for a studio or 1-bedroom, 1,200 sq ft with 2+ bedrooms. The City also sets minimum sizes (220 / 500 / 700 sq ft) — we match the model to them.
One story, 16 ft tall; 20 ft from the front, 4 ft from side and rear lot lines, and 6 ft from any other building.
One space (tandem OK) — but none within half a mile walking of a bus stop or other transit, and none for conversions.
One ADU and one JADU on a single-family lot; with a JADU, the ADU is limited to 800 sq ft.
The ADU must match the house: similar roof type and pitch, exterior finishes and color. We choose finishes to fit.
The City offers its own ADU Go pre-approved plans — we use our own HCD-approved designs.
Based on Garden Grove Municipal Code Ch. 9.54 and the City’s ADU handout and FAQ; minimum sizes are from the City’s 2021 handout — we confirm them for your project. 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 Garden Grove
What an ADU costs in Garden Grove
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. Garden Grove’s minimum sizes favor our studios and larger units; we confirm the fit for your lot.
| 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; Garden Grove Unified School District developer fees. Launch pricing runs through December 31, 2026. Comparison is general — every project differs.
Renting in Garden Grove
Renting out an ADU in Garden Grove
average asking rent for all homes in Garden Grove — up 35% since 2021. HUD's 2027 fair rent for a 2-bedroom in the area is $3,057.
Zillow Observed Rent Index, City of Garden Grove, Aug 2026 · HUD FY2027 FMR ADU for rental incomeGarden Grove ADUs and JADUs can't be rented for less than 30 days — plan on long-term tenants.
There's no owner-occupancy requirement for an ADU; it applies only to a JADU.
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: Garden Grove ADU FAQ and handouts; Civil Code §1947.12. Comparison: HUD FY2027 2-bedroom Fair Market Rent, Santa Ana-Anaheim-Irvine area ($3,057) × 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 Garden Grove
How your Garden Grove permit works — we handle it
Free lot check
Zoning, setbacks, transit distance, easements and utilities for your Garden Grove address.
Plans & submittal
Our HCD-approved plans with finishes matched to your house, plus the City's ADU checklist and site plan.
City review
Planning and Building review; the ADU gets its own address.
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’s ADU handouts and FAQ and Gov. Code §66317. Garden Grove also offers City-owned pre-approved plans (ADU Go).
Why now
Start your Garden Grove 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.
Garden Grove ADU questions
Read our ADU guides, see all of California, or call (209) 214-6845.
Can I build an ADU on my lot in Garden Grove?
Most Garden Grove residential lots with a house can add a one-story detached ADU — up to 850 sq ft for a studio or 1-bedroom, 1,200 sq ft with 2+ bedrooms — with 4-foot side and rear setbacks and no minimum lot size. We check your address for free.
Which Bay Modular models fit Garden Grove's rules?
Garden Grove's 2021 handout sets minimum living areas of 220 sq ft for a studio, 500 for a 1-bedroom and 700 for 2+ bedrooms. Our Small Studio and Large Studio ADU meet them; for other layouts we confirm the fit with the City before you sign.
How much does an ADU cost in Garden Grove?
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 impact fees under 750 sq ft, and school fees only above 500 sq ft.
How long does an ADU permit take in Garden Grove?
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 Garden Grove?
One space, tandem allowed — but none if your home is within half a mile walking of public transit such as a bus stop, or if you convert existing space.
Can I rent my Garden Grove ADU on Airbnb?
No. ADUs and JADUs in Garden Grove can't be rented for less than 30 days.
Do I have to live on the property?
No. There's no owner-occupancy requirement for an ADU in Garden Grove; it applies only to a JADU.
Is an ADU a better investment than a rental property in Garden Grove?
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 Santa Ana-Anaheim-Irvine area ($3,057) earns about 13.6% 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 Garden Grove lot?
Send your Garden Grove address. We'll check zoning, setbacks, transit distance and model fit, 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 Garden Grove, 2021–2025, updated Oct 2026); Zillow Observed Rent Index, City of Garden Grove (Aug 2026); HUD FY2027 Fair Market Rents (Santa Ana-Anaheim-Irvine); Garden Grove Municipal Code Ch. 9.54; City of Garden Grove ADU handouts, ADU FAQ and ADU Go program. Prices: Bay Modular, October 2026. Not legal advice.