Home Remodeling, ADUs & Additions in Walnut Creek
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Our Services in Walnut Creek
Backyard ADUs, garage conversions and junior ADUsBathroom Remodeling in Walnut Creek
Primary suites, hall baths and accessible bathroomsKitchen Remodeling in Walnut Creek
Open layouts, islands, structural and system upgradesHome Additions in Walnut Creek
Single-story additions and second storiesNew Home Construction in Walnut Creek
Custom homes and teardown rebuilds
Walnut Creek General Contractor for ADUs, Additions and Remodels
Axiom Renovation (CA Lic. #1105006) builds ADUs, home additions, kitchen and bathroom remodels and outdoor projects in Walnut Creek. We handle design coordination, the City permit and construction, so you have one licensed contractor from start to finish.
Walnut Creek has its own building division, and all permit applications are submitted online.
What We Build in Walnut Creek
- 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.
Walnut Creek ADU Rules at a Glance
- A single-family lot can have an attached or converted ADU, a detached ADU and a JADU.
- ADU size depends on lot size: on lots up to 14,999 sq ft, 850 sq ft for a studio or one bedroom and 1,000 sq ft for two or more bedrooms (slightly larger studio and one-bedroom limits apply on bigger lots). JADUs can be up to 500 sq ft.
- Detached ADUs are limited to 16 ft (18 ft near transit, plus 2 ft for roof pitch); attached ADUs to 25 ft and two stories.
- Side and rear setbacks are 4 ft, and no parking is required for an ADU or JADU.
- Rentals must be at least 31 days, and units cannot be sold separately.
- Hillside lots (15% or more average slope) have extra standards, including no construction on slopes over 30% or near prominent ridgelines.
Source: Walnut Creek Municipal Code, ADU standards (Ordinances 2246, 2250 and 2252).
Rules change often, so we confirm the current standards for your parcel during the site assessment.
Other Walnut Creek Rules That Affect Your Project
- Design review: almost all exterior construction or alteration needs design review before a building permit; ADUs are exempt.
- Trees: removing a tree with a single trunk of 28 in. circumference or more (about 9 in. diameter) needs a permit; native oaks, madrone, buckeye and black walnut are highly protected.
- Landscaping: the Water Efficient Landscape rules apply to more than 500 sq ft of new irrigated landscape or more than 2,500 sq ft of replaced landscape tied to a permit.
Getting Permits in Walnut Creek
Walnut Creek accepts permit applications only through its online permit portal. Applications submitted on or after January 1, 2026 must follow the 2025 California Building Code.
We Also Work Near Walnut Creek
We also build in nearby Lafayette, Alamo, Danville, and across the Bay Area. See all of our service areas.
Frequently Asked Questions
Does Walnut Creek require parking for an ADU?
No. Walnut Creek does not require parking for an ADU or a junior ADU.
How big can an ADU be in Walnut Creek?
On a typical lot up to 14,999 sq ft, an ADU can be 850 sq ft with a studio or one bedroom, or 1,000 sq ft with two or more bedrooms.
Do I need design review for a home addition in Walnut Creek?
Almost all exterior changes in Walnut Creek need design review before a building permit. ADUs are exempt.
Can I remove a tree for my project in Walnut Creek?
Trees with a single trunk 28 in. in circumference or larger need a removal permit, and native oaks and several other species are highly protected.