Detached ADUs
A separate unit may offer more privacy, but can involve more site work, utilities, foundation planning, and access questions.
ADU Planning + Permits
ADU Contractor in Napa, Sonoma, and Solano
Plan your ADU with one local team before drawings, permits, budget, and construction decisions get expensive to unwind.
Feasibility First
Understand site constraints before over-investing in plans.
Permit-Aware Design
Connect layout, utilities, access, and local review requirements.
Build-Ready Scope
Move forward with clearer decisions, pricing assumptions, and next steps.
Start Here
Start With Feasibility Before Plans
ADUs often involve zoning, utilities, fire access, parking, structural work, septic or sewer questions, and property-specific constraints. A feasibility conversation helps you understand the practical path before the project is locked into assumptions.
Choose The Right ADU Path
ADU Options We Help Homeowners Evaluate
The right path depends on your lot, existing structures, utility access, budget, and how the unit needs to function.
Garage Conversions
Existing structure can help, but slab condition, ceiling height, utilities, fire separation, and waterproofing still matter.
Attached ADUs
An attached ADU can work when entry, structure, layout, and utilities allow a clean separation between living spaces.
JADUs
A junior ADU may fit within the home footprint, but has different owner-occupancy, kitchen, bathroom, and code considerations.
Quick Planning Tool
Get A Rough ADU Budget Starting Point
Use this as an early planning range, not a final quote. The baseline is tied to Napa County prototype ADU guidance that cites the Napa/Sonoma ADU calculator, then adjusted for size and basic site complexity.
Simple ADU Range Calculator
Move the slider and choose the closest site condition. A real estimate still needs property details, plans, utilities, access, and permit review.
Site condition
How The Work Moves
One ADU Path From Site Review To Build
A coordinated design-build process connects early site questions to permit requirements, budget realities, and construction planning.
Project Fit
We review your property, goals, rough timeline, ownership status, and ADU type.
Feasibility
We identify early site, jurisdiction, utility, access, and budget questions.
Scope
We clarify decisions that affect cost, schedule, review, and complexity.
Design + Permits
The design path is organized around what needs to be submitted, reviewed, and built.
Preconstruction
Drawings, selections, trades, utilities, schedule, and sequencing get aligned.
Build
The project moves through construction, inspections, finish details, and closeout.
Local Rules Matter
ADU Rules Are Local And Property-Specific
California has statewide ADU rules, but Napa, Sonoma, Solano, and individual cities still require property-specific review. Lot conditions, utilities, fire access, septic or sewer, easements, existing structures, and design requirements can all change the path.
Local Service Area
ADU Planning For Napa And Nearby Homeowners
Vino focuses on homeowners who need practical ADU feasibility, permit, design, and construction planning in Napa and surrounding communities. Project fit still depends on scope, timing, property conditions, and jurisdiction requirements.
Napa County
Napa, Yountville, St. Helena, Calistoga, Angwin, and nearby unincorporated areas.
South Napa + Solano
American Canyon, Vallejo, Fairfield, Suisun City, Benicia, and nearby neighborhoods.
Sonoma Valley
Sonoma, Glen Ellen, Kenwood, El Verano, Boyes Hot Springs, and nearby communities.
Official Starting Points
Helpful ADU Resources
These official resources can help homeowners research ADU rules. A real project still needs property-specific review.
Homeowner Questions
ADU Contractor FAQs
Do I need plans before talking to an ADU contractor?
No. It is often better to discuss feasibility, site conditions, rough budget range, and permit questions before investing in complete plans.
Is a garage conversion cheaper than a detached ADU?
Sometimes, but not always. Slab upgrades, framing, utilities, waterproofing, fire separation, and finishes can change the budget quickly.
Can Vino help with ADU permits?
Yes. Vino helps coordinate design and permit-ready planning for ADU projects that fit our services. Local requirements still depend on the property and jurisdiction.
What should be included in an ADU estimate?
A useful estimate should clarify scope, exclusions, site assumptions, utilities, design responsibilities, schedule assumptions, allowances, and how changes are handled.
Next Step
Start With A Site-Specific ADU Conversation
Tell us where the property is, what type of ADU you are considering, and how far along you are. We will help identify the right next step before you go too far down the wrong path.