Small modern cottage with a terraceCity of Chula Vista · West and East of I-805 · Detached · Garage · Attached · JADU
ADU Builder in Chula Vista, CA
Backyard units, garage conversions, attached ADUs and JADUs, designed, permitted through Chula Vista Development Services and built by one team. Start by learning what your lot can take, which side of the fee line your plan falls on, and what each part of the job costs.
- 749 sq ftthe largest ADU that still skips every City development impact fee
- 12City Standard ADU Plans, ready to adapt to a Chula Vista lot
- 148ADU building permits the City issued in 2023
- Free Chula Vista ADU Fit Check
- One contract: design, permit, build
Start here
Can your Chula Vista lot take an ADU?
Short answer
Almost certainly. State law lets a single-family lot in Chula Vista carry a converted ADU, a JADU and a new detached ADU, and the City approves them without a public hearing. Using our calculator's mid-range finishes, a 740 sq ft detached unit runs about $281k–$373k, a 400 sq ft garage conversion about $121k–$186k, and a JADU of 300 sq ft at roughly $70k–$135k. The things that move a South Bay budget most are size (impact fees begin at 750 sq ft), which side of I-805 you live on, your water agency, and whether an HOA or a Mello-Roos district sits on the title.
A licensed San Diego general contractor receives the requests sent from this site and runs the whole project: the feasibility check, the drawings, the Chula Vista building permit and the construction. You get a written, itemized range first, and design money is spent only after you agree to go ahead.
Your options
Four ways to add a unit in Chula Vista
Each type follows its own size cap under CVMC 19.58.022 and 19.58.023. The prices are calculator mid-points for a flat lot with short utility runs, including design, City permit, school fees and contingency.
A new building out back
Detached ADU
About $327k at 740 sq ft
Up to 1,200 sq ft and 16 ft tall, or 18 ft within half a mile of transit. Keeps 4 ft off side and rear property lines and sits at least 6 ft from the home.
Detached ADUs in Chula Vista →The walls are already standing
Garage conversion
About $145k–$153k at 400 sq ft
No setbacks for the existing footprint, and the City can't make you replace the parking spaces you give up.
Garage conversions →An addition with its own door
Attached ADU
About $213k at 550 sq ft
Half the house's floor area, or 850 sq ft for one bedroom and 1,000 for two, whichever is bigger. Two stories and 25 ft are allowed.
Attached ADUs →Carved from the house
JADU
About $100k at 300 sq ft
Inside the home, 500 sq ft at most, with an efficiency kitchen. It owes no impact fees and no school fee.
JADUs in Chula Vista →Two cities in one
West vs East Chula Vista: why the lot decides the unit
Interstate 805 splits Chula Vista into two kinds of neighborhoods, and the ADU that makes sense on one side often doesn't on the other.
West of I-805 is the older city: Northwest, Southwest, Castle Park and Hilltop. Most lots there are zoned R-1-7, with a 7,000 sq ft standard and some lots down to 6,000. You rarely deal with an HOA, there's no Mello-Roos on most parcels, and Sweetwater Authority generally supplies the water. The Blue Line stops at E Street, H Street and Palomar Street put a lot of these homes inside the half-mile transit radius, which removes the ADU parking requirement.
East of I-805 means the master-planned communities built from the late 1980s on: Eastlake, Otay Ranch, Rolling Hills Ranch, San Miguel Ranch and Millenia. Expect smaller back yards, an attached front garage, an HOA with design review, at least one community facilities district on the tax bill, and Otay Water District service. Impact fees on a 750 sq ft or larger unit are also higher out east, because the park fee and the Eastern traffic fee cost more there.
For HOA review and CFD taxes, read the Eastlake and Otay Ranch ADU guide. For the older lots, see the West Chula Vista ADU page.
A rough rule, not a boundary
I-805 is a handy shorthand, but water service, CFDs and HOAs follow their own lines. Your water bill and your property tax bill tell you which apply to your parcel.
Local rules
What makes a Chula Vista ADU different
State ADU law applies here like everywhere in California. The City's own code (CVMC 19.58.022 for ADUs and 19.58.023 for JADUs, last amended by Ordinance 3548 in 2023) is still published, and where any part of it is stricter than state law, state law controls. These are the local details that shape real projects.
- City Standard ADU Plans. The City offers 12 detached designs drawn with SnapADU, from 498 to 1,199 sq ft, one to three bedrooms, each with a flipped version. Choosing one means a $3,951 City permit instead of the $4,963 charged for a custom detached design.
- The 750 sq ft fee cliff. Every JADU, and every ADU smaller than 750 sq ft, is exempt from the City's development impact and in-lieu fees. Once a unit reaches 750 sq ft, it owes part of the single-family rate, prorated by its size against the house. Three of the City Standard Plans (498, 748 and 749 sq ft) stay under the line.
- No replacement parking. Turn the garage into an ADU and you don't owe the City new spaces for the ones you lost.
- Transit parking waiver. Within a half-mile walk of public transit, no ADU parking is required, and the City's definition of transit includes bus stops. Rapid 225 stops at East Palomar, Heritage, Otay Ranch and Millenia stations reach well into the east side.
- Two detached ADUs, starting 2027. Back in September 2024, council members rejected a second detached ADU on single-family lots by a 4-1 vote. AB 956, signed September 29, 2026, takes effect January 1, 2027 and makes cities approve two detached ADUs per single-family lot; a city may hold each one to 800 sq ft.
- Two water agencies. Sweetwater Authority serves the west side and Otay Water District serves the east. Each sets its own meter and capacity fees, and neither publishes them online in a form we could confirm.
- Bonita is County land. Bonita and other unincorporated pockets follow San Diego County's ADU rules and County permits, even with a Chula Vista mailing address. Part of Bonita-Sunnyside was annexed into the City, so check the parcel, not the envelope.
Code sections, setbacks and heights are laid out on the Chula Vista ADU rules and permits page.
Two quick lookups
The City's "Build for Chula Vista" tool screens a parcel for ADU options, and CVMapper shows its fire hazard zone. Both take an address and both are free.
2026 numbers
Chula Vista ADU cost snapshot
These figures come straight from the Chula Vista ADU cost calculator at mid-range finishes on a flat lot with a 1,600 sq ft house. They already include design, reports, the City permit, school fees over 500 sq ft and a 10% contingency. Units of 750 sq ft or more also carry impact fees on top.
| Unit | Size | Mid | Planning range |
|---|---|---|---|
| Detached ADU | 500 sq ft | $260k | $224k–$296k |
| Detached ADU | 740 sq ft | $327k | $281k–$373k |
| Detached ADU, west of I-805 | 760 sq ft | $350k | $304k–$399k |
| Detached ADU, east of I-805 | 760 sq ft | $360k | $314k–$411k |
| Detached ADU, west of I-805 | 1,200 sq ft | $484k | $420k–$551k |
| Detached ADU, east of I-805 | 1,200 sq ft | $499k | $435k–$570k |
| Garage conversion | 400 sq ft | $145k–$153k | $121k–$186k |
| Attached ADU | 550 sq ft | $213k | $181k–$245k |
| JADU | 300 sq ft | $100k | $70k–$135k |
Look at the jump from 740 to 760 sq ft: about $23k more on the west side and $33k more on the east, mostly impact fees for 20 extra square feet. The garage mid depends on the slab ($145k if it's sound, $153k with an allowance for leveling). Not included: Sweetwater or Otay meter and capacity fees, the SDCWA capacity charge on a new water meter ($6,683 in 2026), a separate SDG&E meter, a sloped lot, long trenches and any Mello-Roos change.
Rent and demand
What a Chula Vista ADU rents for, and who is building them
Citywide averages from Zumper (November 2026) and RentCafe (October 2026) put a studio near $1,800 to $2,000, a one-bedroom between about $1,950 and $2,250, and a two-bedroom around $2,800 to $2,900. HUD's FY2027 fair market rent for the San Diego-Chula Vista-Carlsbad metro is $2,335 for a one-bedroom and $2,823 for a two-bedroom. Rents in the east ZIPs (91913, 91914, 91915) run higher than in 91910.
In the calculator's mid case, a 740 sq ft one-bedroom backyard unit nets about $22,800 a year after vacancy, added property tax and upkeep, before any loan payment, which is a simple payback of roughly 14 years. A 400 sq ft garage studio nets about $19,600 and pays back in about seven to eight years, because the shell already exists.
Owners here are building. The City's 2023 Annual Progress Report shows 148 building permits for ADUs and 80 finished units that year. For 2024 permits, Chula Vista placed third countywide in a UC San Diego Center for Housing Policy and Design tally, trailing only the City of San Diego and the unincorporated County.
Any rental plan has two limits: no lease shorter than 30 days, and no short-term rental permit for a unit whose permit application dates from 2020 or later. The Chula Vista ADU FAQ covers both.
Rent bands the calculator uses
- Studio: $1,700–$2,150
- One bedroom: $1,950–$2,500
- Two bedrooms: $2,650–$3,300
Fall 2026 market data, not a promise of rent. Location, parking and finishes move it.
One team
Design-build in brief
The City publishes no plan check turnaround times, so the best way to save calendar time is a complete first submittal. The full sequence is on the design-build ADU process page.
Feasibility
City or County parcel, water agency, HOA, CFD, transit distance and the route for sewer and power.
Design
Your own layout, or a City Standard ADU Plan plus the energy report, truss calcs and a site plan drawn for your lot.
HOA review
If there's an association, plans go through its written architectural review before or alongside the City.
City permit
Plans emailed to Development Services, fees paid in Accela Citizen Access, then a 60-day decision clock once complete.
Build and final
Construction with City inspections, utility hookups and a final sign-off so the unit can be lived in or rented.
Free, before you pay for drawings
What the Chula Vista ADU Fit Check includes
A short written report on your parcel that answers the questions that set scope and price.
The units your lot can hold
Any of the four types that fit, each with its own size and height cap, including the 18 ft height allowed near qualifying transit such as a Blue Line station.
Who issues your permit
City or County, and whether a City Standard ADU Plan fits the yard you have.
Fees by threshold
Whether your planned size crosses the 500 sq ft school fee threshold or the 750 sq ft impact fee threshold, and which water agency bills for a new meter.
HOA and Mello-Roos notes
For east-side homes, what the CC&Rs require for review and what your CFD's rate method says about added square footage.
An itemized range
Building, site prep, utility work, design, fees and a contingency, each priced on its own, with the open questions listed.
Request my Fit CheckFree and with no obligation. Nothing is signed until you've seen the numbers.
What this site won't do
We don't post star ratings, project counts or promises about City review times, and the photos are stock images, not finished jobs. You get facts you can check, each with a source at the bottom of the page.
Where we work
Chula Vista neighborhoods and nearby cities
Lot sizes, HOAs and tax districts change from one part of the South Bay to the next. Start with the area closest to yours.
91913 · 91914 · 91915
Eastlake and Otay Ranch
Master HOAs, CFDs taxed by building square footage, attached garages and Otay Water District.
East Chula Vista guide →91910 · 91911
West Chula Vista
Older R-1 lots, few HOAs, little Mello-Roos and the Blue Line close by.
West Chula Vista →91914 · hillside
Rolling Hills Ranch and San Miguel Ranch
Larger homes near open space, each with its own community association and CFD.
Rolling Hills and San Miguel →91902 · County
Bonita
County permits and County ADU plans, plus County septic review first on any lot that isn't on sewer.
Bonita ADUs →Next door to the north
National City
Its own ADU code and handbook, with Sweetwater Authority water.
National City →Coastal Zone
Imperial Beach
Pre-approved plans, and coastal permits that can reach garage conversions.
Imperial Beach →Across the bay
Coronado
A carriage-house option over the garage and an ordinance HCD has flagged.
Coronado →East County edge
Lemon Grove
Pre-approved plans with a 30-day review, plus a legalization path for older units.
Lemon Grove →Terra Nova, Rancho del Rey, Sunbow and more are on the areas we serve page.
In pictures
Inside a small South Bay unit
These are licensed stock photos (Pexels) chosen to show the kind of space or place described. They are not photographs of our contractor's completed projects.
Before you call anyone
Chula Vista ADU builder questions
Who actually builds the ADU if I send the form?
A licensed San Diego general contractor handles design coordination, the Chula Vista permit and construction. Ask for the license number and check it on the Contractors State License Board website before you sign, the same as you would with any builder. The process page lists what else to ask.
How do I pick the best ADU builder in Chula Vista?
Ask every bidder the same local questions: have they worked with the City Standard ADU Plans, how do they handle Sweetwater or Otay meter fees, what does their price assume about your sewer line, and is the bid itemized. A builder who can't answer those for your street is guessing. Compare written bids line by line, not by the total.
What's the least expensive way to add a rental unit here?
Usually a JADU first and a garage conversion second. Both reuse an existing structure, skip impact fees and avoid most site work. If you want a backyard unit, keeping it under 750 sq ft and starting from a City Standard Plan trims both fees and design cost. See the garage conversion page for the numbers.
Can I build two detached ADUs on my lot?
Not under the City's current approach for single-family lots. That changes on January 1, 2027, when AB 956 takes effect and a second detached unit becomes allowed by right, though the City may hold each one to 800 sq ft. If you're designing now, ask for a site plan that leaves room for the second unit.
Do you work in Bonita and the nearby cities?
Yes. Bonita and the unincorporated areas go through San Diego County instead of the City, and National City, Imperial Beach, Coronado and Lemon Grove each run their own permit counters. Put your address in the form and you'll hear back plainly on whether the project fits.
Sources
- Chula Vista Municipal Code 19.58.022, Accessory dwelling units; 19.58.023, Junior accessory dwelling units
- City of Chula Vista, Fee Bulletin 10-400, building permit fees (Sept 2024)
- City of Chula Vista, Fee Bulletin 16-100, development and in-lieu fees (Oct 2025)
- City of Chula Vista, City Standard ADU Plans guide and checklist
- City of Chula Vista, 2023 Housing Element Annual Progress Report
- UC San Diego Center for Housing Policy and Design, 2024 ADU permits by jurisdiction
- KPBS, Chula Vista council vote on detached ADUs (Oct 2024)
- AB 956 (Ch. 791, Stats. 2026), bill status and digest
- MTS, Trolley stations; MTS Rapid 225 schedule
- Otay Water District, service area; Sweetwater Authority application guide (Rev 9/2023)
- San Diego County PDS, Accessory dwelling units
- Zumper, Chula Vista rent research (Nov 2026); RentCafe, Chula Vista rent trends (Oct 2026)
- California HCD, ADU Handbook (Mar 2026)
Last checked November 7, 2026. Cost ranges are planning estimates, not bids.
See which ADU fits your Chula Vista lot
Tell us your address and what the unit is for. A licensed San Diego general contractor reviews it and sends back the type that fits, the permit path and an itemized range.