ADU Builders in Chula Vista, CA (2026)

An ADU builder in Chula Vista is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Chula Vista's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in California.

What ADU Builders Cost in Chula Vista ^[10]^[11]^[12]

Based on our Chula Vista cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.

New Detached ADU (all-in)	$300,000-$450,000
Cost per Sq Ft	$375-$600
Garage Conversion	$80,000-$180,000
Prefab / Modular ADU (installed)	$170,000-$325,000
City Permit & Plan Review	Fee Bulletin 10-400 (Sept 2024): detached ADU on a City Standard Plan $3,951 (intake $476 + plan check $533 + inspection $2,942); custom detached up to 1,200 sq ft $4,963; garage conversion $1,604 for the first 400 sq ft. Fire, school and utility fees are extra.
Impact Fees	Waived for ADUs with 750 sq ft or less of interior livable space and for all JADUs (Gov. Code 66311.5(c)(1)). Larger ADUs pay the city's DIFs in proportion to the main house's floor area: Fee Bulletin 16-100 (October 2025) sets the Public Facilities DIF at $16,002 per single-family unit plus a parkland fee of $14,860 west of I-805 or $22,542 east, plus area traffic and sewer-basin DIFs. Facilities Financing (FF@chulavistaca.gov) gives estimates; rates re-index every October 1 and most DIFs can be deferred to final inspection. School fees apply to ADUs of 500 sq ft or more.

For a full line-item breakdown, see our Chula Vista ADU cost guide. To confirm what you're allowed to build before you hire, review the Chula Vista ADU rules (max detached size: 1,200 sq ft of floor area (Gov. Code 66314(d)(5), which the city applies directly; city ADU page). A detached ADU of up to 800 sq ft with 4 ft side and rear setbacks and 16 ft height cannot be blocked by lot coverage, floor-area-ratio or open-space limits (Gov. Code 66321(b)(3)).; owner-occupancy: Not required for ADUs (Gov. Code 66315; city ADU page: 'No owner-occupancy required'). A JADU needs owner-occupancy only if it shares a bathroom with the main house; a JADU with its own bathroom does not (Gov. Code 66333(b), AB 1154, effective 2026). A JADU also requires a recorded deed restriction (city ADU page).).

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How to Vet an ADU Builder in Chula Vista

License: Confirm a current contractor's license in California and that it's in good standing. Ask for the license number and verify it with the state board.
ADU-specific experience: Ask how many ADUs they've completed in or near Chula Vista and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits (Fee Bulletin 10-400 (Sept 2024): detached ADU on a City Standard Plan $3,951 (intake $476 + plan check $533 + inspection $2,942); custom detached up to 1,200 sq ft $4,963; garage conversion $1,604 for the first 400 sq ft. Fire, school and utility fees are extra.), plan check (Electronic plan review through Accela Citizen Access; corrections are emailed and downloaded from the portal. The 10-400 fees cover the first two plan reviews and first two inspections; later reviews are billed at $146 for the first half hour. Standard-plan submittals still need site-specific sheets: site plan, energy compliance for the plan, foundation type and climate zone (7 or 10), soils report or waiver on sheet G102, truss calcs, stormwater BMP and utility data (City Standard ADU checklist).), and impact fees (Waived for ADUs with 750 sq ft or less of interior livable space and for all JADUs (Gov. Code 66311.5(c)(1)). Larger ADUs pay the city's DIFs in proportion to the main house's floor area: Fee Bulletin 16-100 (October 2025) sets the Public Facilities DIF at $16,002 per single-family unit plus a parkland fee of $14,860 west of I-805 or $22,542 east, plus area traffic and sewer-basin DIFs. Facilities Financing (FF@chulavistaca.gov) gives estimates; rates re-index every October 1 and most DIFs can be deferred to final inspection. School fees apply to ADUs of 500 sq ft or more.) are included.
Permit handling: Confirm they manage Chula Vista's permit process ("Ministerial building permit through Development Services, submitted electronically (Accela Citizen Access / EPR); no hearing or design review. The City Standard ADU checklist requires a site plan, Title 24 energy calcs, truss calcs, a stormwater BMP sheet, a geotechnical report or signed soils waiver (cut or natural grade only), a hold-harmless agreement and affidavit for standard plans, and SDG&E / water-district applications for any new meter. Completeness is determined within 15 business days and the permit is approved or denied within 60 days of a complete application (Gov. Code 66317).", typically City target: 14 business days plan review for City Standard ADU Plans, 21 business days for a custom submittal (Development Services ADU page). State law requires a decision within 60 days of a complete application or the permit is deemed approved (Gov. Code 66317(a)(3), SB 543, 2026).) and who is responsible if revisions are required.
Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.

Questions to Ask Before You Hire

How many ADUs have you built in Chula Vista in the last two years?
Is your bid fixed-price, and what would trigger a change order?
Are permits, plan check, and utility connection fees included?
What's a realistic timeline, including permit review (City target: 14 business days plan review for City Standard ADU Plans, 21 business days for a custom submittal (Development Services ADU page). State law requires a decision within 60 days of a complete application or the permit is deemed approved (Gov. Code 66317(a)(3), SB 543, 2026).) and construction?
Who is my point of contact and how are delays communicated?
What warranty do you provide on workmanship?
Can you share three recent California ADU client references?

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Frequently Asked Questions

How much do ADU builders charge in Chula Vista?

ADU builders in Chula Vista typically quote $300,000-$450,000 for a new detached unit, or about $375-$600 per square foot, including design, permitting, and construction. A garage conversion runs $80,000-$180,000 and a prefab/modular ADU averages $170,000-$325,000. Add city permit and plan-review fees (Fee Bulletin 10-400 (Sept 2024): detached ADU on a City Standard Plan $3,951 (intake $476 + plan check $533 + inspection $2,942); custom detached up to 1,200 sq ft $4,963; garage conversion $1,604 for the first 400 sq ft. Fire, school and utility fees are extra.) plus impact fees of Waived for ADUs with 750 sq ft or less of interior livable space and for all JADUs (Gov. Code 66311.5(c)(1)). Larger ADUs pay the city's DIFs in proportion to the main house's floor area: Fee Bulletin 16-100 (October 2025) sets the Public Facilities DIF at $16,002 per single-family unit plus a parkland fee of $14,860 west of I-805 or $22,542 east, plus area traffic and sewer-basin DIFs. Facilities Financing (FF@chulavistaca.gov) gives estimates; rates re-index every October 1 and most DIFs can be deferred to final inspection. School fees apply to ADUs of 500 sq ft or more.. Quotes for the same scope commonly vary 20-40% between builders, so collect at least three bids.

How do I find a good ADU builder in Chula Vista?

Look for a licensed contractor with completed ADU projects in Chula Vista specifically — ADUs involve local zoning, setback rules, and utility connections that general remodelers may not have handled. Verify the license, ask for an ADU-specific portfolio and references, confirm they carry liability and workers' comp insurance, and get a written fixed-price or detailed bid. Submit a request below and we'll forward it to local ADU builders serving Chula Vista for free quotes.

Do ADU builders in Chula Vista handle permits?

Most full-service ADU builders manage the permit process for you. In Chula Vista the approval process is "Ministerial building permit through Development Services, submitted electronically (Accela Citizen Access / EPR); no hearing or design review. The City Standard ADU checklist requires a site plan, Title 24 energy calcs, truss calcs, a stormwater BMP sheet, a geotechnical report or signed soils waiver (cut or natural grade only), a hold-harmless agreement and affidavit for standard plans, and SDG&E / water-district applications for any new meter. Completeness is determined within 15 business days and the permit is approved or denied within 60 days of a complete application (Gov. Code 66317)." with a typical review timeline of City target: 14 business days plan review for City Standard ADU Plans, 21 business days for a custom submittal (Development Services ADU page). State law requires a decision within 60 days of a complete application or the permit is deemed approved (Gov. Code 66317(a)(3), SB 543, 2026).. Confirm in writing whether permit fees, plan check (Electronic plan review through Accela Citizen Access; corrections are emailed and downloaded from the portal. The 10-400 fees cover the first two plan reviews and first two inspections; later reviews are billed at $146 for the first half hour. Standard-plan submittals still need site-specific sheets: site plan, energy compliance for the plan, foundation type and climate zone (7 or 10), soils report or waiver on sheet G102, truss calcs, stormwater BMP and utility data (City Standard ADU checklist).), and impact fees are included in the bid or billed separately.

How long does it take to build an ADU in Chula Vista?

Plan for the permit review (City target: 14 business days plan review for City Standard ADU Plans, 21 business days for a custom submittal (Development Services ADU page). State law requires a decision within 60 days of a complete application or the permit is deemed approved (Gov. Code 66317(a)(3), SB 543, 2026). in Chula Vista) plus construction. Most detached ADUs take 4-8 months of construction after permits are issued; garage conversions and prefab units are often faster. Ask each builder for a realistic schedule and what could delay it.

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Build Cost	$300,000-$450,000
Garage Conv.	$80,000-$180,000
Permit Fees	Fee Bulletin 10-400 (Sept 2024): detached ADU on a City Standard Plan $3,951 (intake $476 + plan check $533 + inspection $2,942); custom detached up to 1,200 sq ft $4,963; garage conversion $1,604 for the first 400 sq ft. Fire, school and utility fees are extra.
Timeline	City target: 14 business days plan review for City Standard ADU Plans, 21 business days for a custom submittal (Development Services ADU page). State law requires a decision within 60 days of a complete application or the permit is deemed approved (Gov. Code 66317(a)(3), SB 543, 2026).
1BR Rent	$2,300-$3,700/mo

What ADU Builders Cost in Chula Vista [10][11][12]