Building an ADU in Dixon, CA in 2026 costs roughly $80,000–$150,000 for a garage conversion, $140,000–$250,000 for an attached ADU, and $175,000–$350,000 for a new detached unit. Permit fees from the City of Dixon Building Division run $2,500–$8,000 depending on project scope. Units 750 sq ft and under pay zero development impact fees under California's SB 543 law. The city's counter is at 600 East A Street, and all applications now run through the online Tyler Technologies portal launched December 1, 2025. Realistic timeline: 4–8 months for a garage conversion, 6–11 months for new detached construction. Dixon's 30-day substantive review window beats most comparable cities.
Dixon's ADU Moment: Small Town, Serious Demand
Dixon doesn't get covered in the Sacramento-region ADU conversation. That's a gap worth noting, because the economics here are better than most people expect.
The city sits at the I-80 intersection between Sacramento (23 miles east) and the Bay Area (66 miles west). Travis Air Force Base is 18 miles away in Fairfield, with a 20–30 minute commute that's easy enough to make daily. UC Davis is 23 miles to the east. Military families, university commuters, and Bay Area workers priced out of Vacaville all put steady pressure on Dixon's rental inventory.
Dixon also has something most Sacramento-region cities don't: lot size. The older neighborhoods near West A Street were platted when the town was farm-adjacent, and the newer Valley Glen and Homestead subdivisions were built with suburban setbacks. Larger lots mean more room to site a detached unit without the tight choreography you need in Davis or Sacramento's urban core.
The town is home to the Dixon May Fair — the oldest district fair and fairgrounds in California, held every May — and the annual Lambtown Festival, which draws fiber-arts enthusiasts from across the West. Dixon is genuinely small-town, genuinely California, and genuinely undervalued as an ADU market.
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The Dixon Permit Process
California state law requires ministerial approval for code-compliant ADUs. The City of Dixon follows that framework: staff review your plans against a standard checklist of setbacks, height, lot coverage, and fire safety requirements, then approve or issue corrections. A conforming ADU can't be denied based on what neighbors think or what the city considers optimal for the block.
Where to Apply
City of Dixon, Building Division
600 East A Street, Dixon, CA 95620
Phone: (707) 678-7000
Email: buildingdivision@cityofdixonca.gov
As of December 1, 2025, the City of Dixon moved all permit applications to an online Tyler Technologies portal (dixonca-energovweb.tylerhost.net). Walk-in questions are still handled at the Building Division counter, but all applications, plan review submissions, payments, and inspection scheduling now happen through the portal.
How Fast Is the Review?
Dixon's substantive ADU review window is 30 days from a complete application — shorter than the 60-day California state maximum. That doesn't mean 30 days from when you drop off paperwork. The clock starts when the city accepts your submittal as complete. An incomplete application extends your timeline by however long it takes you to provide what's missing.
State law also requires cities to notify applicants within 15 business days whether a submittal is complete. If Dixon doesn't respond in time, your application is automatically deemed complete and the 30-day review clock starts. The 2025 California Building Standards Code took effect January 1, 2026, so all ADU plans submitted in 2026 must comply with the updated standards.
What You'll Need to Submit
- Site plan showing lot boundaries, setbacks, utility routing, and drainage
- Floor plans, exterior elevations, and building cross-sections
- Structural calculations stamped by a California-licensed engineer (detached ADUs)
- Title 24 energy compliance documentation
- Deed restriction recorded before permit issuance (JADUs only)
The most common reason for delay is an incomplete structural package or missing Title 24 documentation. Getting the submittal right on the first pass saves more time than any other single action.
Dixon ADU Rules: Size, Setbacks & Height (2026)
Dixon defaults to California state minimums for ADU standards. Here's what applies to most single-family lots in the city:
Detached ADU
- Max size: Up to 1,200 sq ft (state-set maximum)
- Side/rear setbacks: 4 feet from property lines
- Height: Up to 16 feet by right for a one-story detached unit; above-garage structures may reach 18–20 feet depending on lot configuration
- Parking: No additional parking required if the lot is within ½ mile of a transit stop, in a historic district, or within one block of a car-share service. Garage conversions can't trigger replacement parking.
Attached ADU
- Max size: Up to 50% of the primary dwelling's floor area (state minimums allow at least 800 sq ft regardless)
- Setbacks: Generally follow the primary dwelling's setbacks
Junior ADU (JADU)
- Max size: 500 sq ft, created from existing space within the primary home
- Owner occupancy: Required in either the primary home or the JADU
- Deed restriction: Must be recorded before building permit issues
Garage Conversion
- Typically the lowest-cost ADU path because the existing foundation, walls, and roof are reused
- Treated as ministerial under state rules; Dixon can't require replacement parking
- One garage conversion and one new detached ADU are allowed on a single-family lot
Dixon's Pre-Approved ADU Plan Program
Dixon has an active Pre-Approved ADU Plan Program. That puts it ahead of cities like Woodland, where the public plan catalog was still marked “coming soon” as of mid-2026.
The program works like this: architects, builders, and designers submit detached ADU designs for city plan review. Once approved, those designs get added to Dixon's pre-approved list. Homeowners who choose a design from the list skip the architectural plan-check phase entirely, which saves both time and money.
If you're planning a standard detached unit in the 400–750 sq ft range, checking the pre-approved list first makes sense. Using an approved design can trim $5,000–$12,000 in design costs and shave weeks off your permit timeline compared to a fully custom submittal. Check cityofdixonca.gov/BuildingDivision for the current list before engaging a designer.
Want to see roughly what a pre-approved-size ADU would cost before you get into design? Try the Safeway ADU cost calculator — it runs numbers by unit type and square footage in about 2 minutes.
Dixon ADU Costs (2026)
These ranges reflect Dixon and broader Sacramento-region market pricing, adjusted for local labor and lot conditions. Costs vary by finish level, site access, and whether your existing utilities can support a second unit.
Garage Conversion / JADU
| Type | Construction Cost | Building Permit Fees | Impact Fees |
|---|---|---|---|
| Single-car garage conversion (250–400 sq ft) | $80,000–$120,000 | $2,500–$5,000 | $0 if under 750 sq ft |
| Double-car garage conversion (400–600 sq ft) | $110,000–$150,000 | $3,500–$6,000 | $0 if under 750 sq ft |
| JADU from interior space | $55,000–$100,000 | $2,000–$4,500 | $0 under 750 sq ft |
Attached ADU
| Size | Construction Cost | Permit Fees | Notes |
|---|---|---|---|
| 400–600 sq ft | $140,000–$200,000 | $3,500–$6,500 | Shares wall with primary home |
| 600–800 sq ft | $185,000–$250,000 | $5,000–$8,000 | Utility tie-in usually simpler |
Detached ADU
| Size | Construction Cost | Permit Fees | Impact Fees |
|---|---|---|---|
| Under 750 sq ft | $175,000–$285,000 | $4,500–$7,500 | $0 (SB 543 exempt) |
| 750–1,000 sq ft | $245,000–$315,000 | $6,000–$8,000 | City impact fees apply |
| 1,000–1,200 sq ft | $295,000–$350,000+ | $7,000–$9,000+ | Full impact fee schedule |
The 750 sq ft threshold is the most important design decision you'll make. California's SB 543 (effective January 1, 2026) exempts ADUs at or under 750 sq ft of interior livable space from most development impact fees. For larger units, the City of Dixon's Development Impact fee schedule (AB 1600 fees updated May 5, 2025, with a 2.4% CPI adjustment effective July 1, 2025) kicks in, covering transportation, parks, and public facilities. The difference can be $5,000–$15,000 in additional fees for a unit that crosses the threshold.
Utility Connection Costs
New utility laterals are the line item most homeowners miss. If your detached ADU needs its own water, sewer, or electrical connection from the street:
- Water/sewer new laterals: $4,000–$16,000 depending on distance and lot conditions
- Electrical service upgrade or sub-panel: $2,500–$5,500
- Gas stub (if applicable): $1,200–$3,000
If your existing utilities can handle a second unit, these costs drop substantially. A contractor assessment early in the process tells you which bucket you're in — and that information shapes your budget before you commit to anything.
2026 California ADU Laws That Affect Dixon Projects
SB 543: Fee Exemptions by Size
SB 543 (effective January 1, 2026) creates two clear exemption tiers:
- ADUs under 500 sq ft: Fully exempt from school impact fees charged by Dixon Unified School District (DUSD)
- ADUs under 750 sq ft: Exempt from most development impact fees
For Dixon homeowners, this makes the 750 sq ft design target financially significant. A compact detached ADU at 749 sq ft pays zero development impact fees. The same unit at 800 sq ft does not. Designing to that threshold is one of the first decisions worth getting right.
The 30-Day Review Window
Dixon's substantive review period is 30 days, shorter than the state's 60-day cap. Combined with the 15-business-day completeness-check rule (after which your application is automatically deemed complete if the city doesn't respond), a clean first-pass submittal can move through Dixon's process faster than in larger Sacramento-area cities with backlogged plan-check queues.
AB 1154: The Condo Sale Pathway
AB 1154 (effective 2024) allows ADUs to be sold separately as condominiums in certain circumstances. It's uncommon in current practice but worth knowing if you're thinking long-term. Dixon homeowners who might want to sell an ADU unit independently, rather than the whole property, should keep this on their radar.
Neighborhood Cost Guide: Where You're Building in Dixon
Downtown Dixon / West A Street Corridor
The historic residential blocks near West A Street, North Adams Street, and downtown Dixon carry homes from the 1920s through 1960s. These are Dixon's oldest residential properties: bungalows, Craftsman-style homes, and older cottages, many with detached garages on alley-accessed lots.
The detached garages in this area are often solid ADU candidates — independent structures, already on their own foundations, with ceiling heights that work for conversion. The complication is the age of the primary home. Pre-1965 homes in downtown Dixon frequently have:
- Galvanized supply lines ($3,000–$8,000 partial; $8,000–$16,000 full)
- Undersized 100-amp electrical panels ($2,500–$4,500 to upgrade)
- Early wiring systems that may need remediation ($3,000–$8,500)
- Lead paint in older interior finishes ($200–$500 for testing; abatement varies)
Typical ADU cost in Downtown Dixon / West A corridor: $95,000–$145,000 for a garage conversion (factoring in likely electrical and plumbing work); $195,000–$275,000 for a new detached unit up to 750 sq ft. A pre-construction assessment on any home built before 1970 isn't optional here.
Valley Glen / Southwest Dixon
Valley Glen is a well-established planned community developed from roughly 2003 to 2006 in Dixon's southwestern quadrant. Homes here feature modern electrical panels, updated plumbing, and generally larger lot footprints than the downtown core. The neighborhood draws buyers who want I-80 commuter access (Sacramento in 25 minutes, Vacaville in 15) with a quieter pace than either city offers.
Infrastructure surprises are rare in Valley Glen — the homes are simply too new. ADU projects here tend to proceed more cleanly, with fewer hidden costs and lower contingency requirements. The potential wrinkle: some Valley Glen subdivisions have HOA CC&Rs with architectural review requirements. Check yours before designing. An HOA review can add 30–60 days to your timeline even after the city permit is in hand.
Typical ADU cost in Valley Glen: $80,000–$130,000 garage conversion; $175,000–$260,000 new detached unit under 800 sq ft.
Homestead / North Dixon
The Homestead area in north Dixon includes a mix of newer single-family homes developed in the 2000s and early 2010s, plus the Four Seasons at Homestead 55+ community. The surrounding streets offer I-80 access from the north end of town and some of Dixon's larger lots, which matters for detached ADU siting.
Infrastructure is generally modern. Lots are often deep enough to position a 750 sq ft detached unit at the required 4-foot setbacks without significant site engineering. That makes this a practical option for homeowners who want a rental unit that functions independently from the main house.
Typical ADU cost in Homestead / North Dixon: $82,000–$128,000 garage conversion; $178,000–$265,000 new detached unit under 750 sq ft.
Rural-Residential Parcels (City Fringe)
Dixon's city limits include some rural-residential parcels on the edges of town — larger agricultural-adjacent lots that predate the newer subdivisions. These properties often have the most space for a detached ADU, but they also carry the highest utility-connection uncertainty.
If your lot is on the fringe of Dixon's city services, confirm water and sewer availability before designing. A lot that requires a new sewer lateral from a distant main, or one that sits on septic, can add $15,000–$30,000 to a project that otherwise pencils cleanly.
Typical ADU cost on rural-residential parcels: $80,000–$140,000 garage or barn conversion; $175,000–$310,000 new detached unit (wide range due to site variability).
Timeline: From Design to Rental Income
| Phase | Garage Conversion | New Detached (under 750 sq ft) | New Detached (750–1,200 sq ft) |
|---|---|---|---|
| Design & engineering | 3–6 weeks | 7–12 weeks | 9–14 weeks |
| Permit review (complete app) | 3–5 weeks | 3–5 weeks | 4–7 weeks |
| Corrections/resubmittal | 0–3 weeks | 0–4 weeks | 0–4 weeks |
| Construction | 3–5 months | 4–6 months | 5–7 months |
| Total (typical) | 4–8 months | 6–10 months | 8–11 months |
Dixon's 30-day substantive review window is a genuine advantage over larger Sacramento-region cities where plan-check queues can run 6–10 weeks. A clean first submittal can move through Dixon's process in 3–5 weeks, which puts your project on the faster end of these ranges. We manage the permit process end to end on Sacramento-region ADU projects — it's not a step worth navigating alone, especially in a city that just transitioned to a new online permit portal.
Rental Income: What to Expect in Dixon
Dixon's rental market is smaller than Davis or Sacramento, but demand is real and consistent. Average one-bedroom rents run $1,437–$1,825 per month depending on source, with 2026 data trending toward the upper end of that range for updated units. Two anchors keep occupancy steady:
Travis AFB (18 miles). Military families assigned to Travis need housing near Fairfield and Vacaville, but a portion choose Dixon for its quieter pace and I-80 access. BAH rates for Travis personnel in Solano County support rents in the $1,700–$2,200 range for one- and two-bedroom units.
UC Davis and Sacramento commuters (23 miles east). Davis rents have been under sustained pressure from UC enrollment and limited housing supply for years. Some Davis-adjacent workers and students choose Dixon for lower rents and highway access. Sacramento commuters who prefer a smaller-town environment look at Dixon for the same reason.
| ADU Type | Est. Monthly Rent | Annual Income | Rough Payback Period |
|---|---|---|---|
| Studio / JADU (300–450 sq ft) | $1,100–$1,500 | $13,200–$18,000 | 10–13 years |
| 1-bedroom ADU (550–650 sq ft) | $1,500–$1,900 | $18,000–$22,800 | 9–12 years |
| 2-bedroom ADU (750–900 sq ft) | $1,900–$2,400 | $22,800–$28,800 | 10–13 years |
Property value impact: A well-built ADU in Dixon typically adds $120,000–$210,000 to a home's resale value, though this varies based on unit size, neighborhood, and finish level.
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Frequently Asked Questions
Can the City of Dixon deny my ADU permit?
Not if it meets California state code. Dixon processes conforming ADU applications ministerially. City staff review against a standard checklist and can't reject based on neighbor preference or neighborhood character. The substantive review window is 30 days from a complete submittal.
What are the impact fees for a Dixon ADU?
Units at or under 750 sq ft pay zero development impact fees under SB 543. Units under 500 sq ft are also exempt from Dixon Unified School District school fees. For larger units, the city's Development Impact fee schedule (updated May 5, 2025, with a 2.4% CPI adjustment effective July 1, 2025) applies. Contact buildingdivision@cityofdixonca.gov for the current fee table before finalizing your unit size.
How much does a detached ADU cost in Dixon?
New detached ADUs in Dixon run approximately $175,000–$350,000 in construction costs, at $280–$450 per square foot. Permit fees add $4,500–$9,000. Utility connections can add $4,000–$16,000 if new laterals are needed. Garage conversions are considerably less ($80,000–$150,000) because the structure already exists.
Does Dixon have pre-approved ADU plans?
Yes. Dixon has an active Pre-Approved ADU Plan Program where designers submit detached ADU plans for city review, and approved designs go on a list homeowners can use to skip the architectural plan-check phase. This can cut $5,000–$12,000 in design costs and weeks off the permit timeline. Check cityofdixonca.gov/BuildingDivision for the current approved plan list.
How long does an ADU permit take in Dixon?
Dixon's substantive review window is 30 days from a complete application. The city has 15 business days to confirm whether your submittal is complete. Plan on 2–3 months from design start to permit issuance using a custom design. Construction adds 3–5 months for a garage conversion, 4–6 months for new detached work. Total: 4–8 months for a garage conversion, 6–10 months for a new detached unit.
Do older downtown Dixon homes cost more to build an ADU?
Yes. The historic residential blocks near West A Street and downtown Dixon include homes from the 1920s through 1960s. Pre-1965 properties in this area frequently have galvanized plumbing, undersized electrical panels, and early wiring systems. Budget $4,000–$15,000 as a contingency for infrastructure upgrades. The actual number depends on what a contractor finds during the pre-construction assessment.
How does Dixon compare to Davis for ADU costs?
Dixon generally costs less to build in than Davis. Land costs are lower, lot sizes are more generous, and Dixon's 30-day review window is faster than Davis's typical plan-check timeline. The tradeoff is a smaller rental market — Davis commands higher rents from UC Davis housing pressure. Dixon's strength is military and commuter tenants who want I-80 access without paying Davis prices.
What rental income can I expect from a Dixon ADU?
Average one-bedroom rents in Dixon run $1,437–$1,825 per month, with 2026 data trending toward the upper end for updated units. A well-positioned 1-bedroom ADU can realistically rent for $1,500–$1,900/month; a 2-bedroom for $1,900–$2,400. Travis AFB personnel (BAH rates support Solano County rents) and UC Davis/Sacramento commuters are the primary tenant pool.
More ADU Guides
- Davis ADU Guide: Permits, Costs & Free Pre-Approved Plans (2026)
- Sacramento ADU Guide: Permits, Costs & Rental Income (2026)
- Woodland ADU Guide: Permits, Costs & Local Rules (2026)
- West Sacramento ADU Guide: Permits, Costs & Local Rules (2026)
- California's 2026 ADU Laws: What Sacramento & Yolo County Homeowners Need to Know
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