Home Remodeling, ADUs & Additions in Danville
Get a Free Danville Project Consultation
Our Services in Danville
Backyard ADUs, garage conversions and junior ADUsBathroom Remodeling in Danville
Primary suites, hall baths and accessible bathroomsKitchen Remodeling in Danville
Open layouts, islands, structural and system upgradesHome Additions in Danville
Single-story additions and second storiesNew Home Construction in Danville
Custom homes and teardown rebuilds
Danville General Contractor for ADUs, Additions and Remodels
Axiom Renovation (CA Lic. #1105006) builds ADUs, home additions, remodels, pools and outdoor living projects in Danville. We handle design, Town planning review, the building permit and construction.
The Town of Danville runs its own permit center, and projects may also need sign-off from Central San, EBMUD and San Ramon Valley Fire.
What We Build in Danville
- ADUs: detached, attached and junior ADUs, plus garage conversions
- Home additions and second story additions
- New custom homes, including tear-down and rebuild
- Kitchen and bathroom remodels and whole-home renovations
- Outdoor living: pools and spas, outdoor kitchens, pavers and hardscape, and artificial turf, lawns and landscaping
See finished work in our portfolio.
Danville ADU Rules at a Glance
- A single-family lot can have up to three units: an attached ADU, a JADU and a detached ADU (800 sq ft or less when combined with the others).
- ADUs can be up to 1,200 sq ft in most districts, or 2,000 sq ft in districts with larger minimum lot sizes. Attached ADUs are capped at 50% of the main home, and an 800 sq ft ADU is always allowed. JADUs can be up to 500 sq ft.
- Detached ADUs can be 16 ft tall with reduced setbacks, or 24 ft if they meet the main home setbacks; attached ADUs up to 25 ft.
- Side and rear setbacks are 4 ft, measured to the furthest projection; a survey is required if any setback is under 5 ft.
- New detached ADUs must include solar, and ADU exteriors must match the main home.
- Rentals must be 30 days or more. The Town offers free pre-approved “Garden Cottage” ADU plans.
Source: Town of Danville ADU FAQ (November 2025).
Rules change often, so we confirm the current standards for your parcel during the site assessment.
Other Danville Rules That Affect Your Project
- Second stories: on lots of 15,000 sq ft or less, a second story can be no more than 80% of the ground floor area.
- Fences and retaining walls: fences up to 3.5 ft in the front setback and 6 ft at sides and rear (7 ft with lattice); retaining walls up to 6 ft, and walls over 4 ft need a permit.
- Pools, spas and hot tubs need a permit and must meet drowning-prevention barrier requirements.
- Trees: native protected species 10 in. or more in diameter, and heritage trees 36 in. or more, need a tree removal permit.
- Central San: additions, decks and ADUs need Central San review before applying.
Getting Permits in Danville
Danville accepts applications through its Online Permit Center Portal or in person at 500 La Gonda Way.
We Also Work Near Danville
We also build in nearby Alamo, San Ramon, Walnut Creek, and across the Bay Area. See all of our service areas.
Frequently Asked Questions
How many ADUs can I build in Danville?
A single-family lot in Danville can have up to three units: an attached ADU, a junior ADU and a detached ADU.
Does Danville offer pre-approved ADU plans?
Yes. The Town offers free “Garden Cottage” plans for a studio, a one-bedroom and a two-bedroom ADU.
Do I need a permit for a pool in Danville?
Yes. Pools, spas and hot tubs need a permit and must meet drowning-prevention barrier requirements.
When does a retaining wall in Danville need a permit?
Retaining walls over 4 ft, measured from the bottom of the footing, or with a surcharge need a building permit.