ADU Builder in Campbell
Campbell's walkable, tree-lined neighborhoods near downtown and the Pruneyard are a strong fit for backyard and garage-conversion ADUs.
The classic single-family lots around Downtown Campbell and the Pruneyard are well suited to both detached backyard ADUs and garage conversions, and Campbell's central location keeps rental demand strong. Working out of nearby Cupertino, we design and build ADUs throughout Campbell that fit the character of these established neighborhoods while managing the city's permitting process from start to finish.
Local Landmarks We Serve Near
Services Available in Campbell
Detached ADU / Backyard Home Construction
From $180,000
Garage Conversion ADU
From $95,000
Junior ADU (JADU) Conversion
From $65,000
Attached ADU Home Addition
From $150,000
Prefab / Modular ADU Installation
From $120,000
ADU Design & Architectural Plans
From $8,500
ADU Permitting & Cupertino Approvals
From $4,500
ADU Foundation & Site Work
From $25,000
ADU Interior Finishing & Final Build-out
From $35,000
A Cupertino ADU Process Built on Code Compliance
Three phases, each with its own inspection checkpoint before we move to the next
Feasibility & Code Review
We check your lot against California statewide ADU standards and City of Cupertino zoning before drawing a single line, so the design starts code-correct.
Text us for a quoteEngineering & Permit Sign-Off
A licensed structural engineer stamps the plans, and we manage every correction with the City of Cupertino until the permit clears.
Build With Staged Inspections
Framing, electrical, plumbing, and final walkthroughs are each independently checked against code before covering the work — no shortcuts hidden behind drywall.
Licensed & Insured
Full coverage protection
Satisfaction Guaranteed
100% money-back guarantee
Structural Engineer Stamped
Every plan set reviewed
Staged Inspections
Checked before each phase
Recent ADU Builds in Cupertino
A look at real projects from our Cupertino crew — detached backyard homes, garage conversions, and interior finish work across Santa Clara County.
Service Areas
The same code-compliance standard applied across Cupertino and 10 Santa Clara County communities
ADU Construction Service Area
Real, professional ADU design-build across Cupertino and every neighboring Santa Clara County city — real municipal boundaries, not a schematic.
Cities We Serve
Don't see your city listed? We likely still cover it — reach out and ask.
Frequently Asked Questions
Have a question we didn't answer? Text us and we'll get right back to you.
What does code compliance actually mean for my ADU project?
It means every drawing is checked against California statewide ADU standards and City of Cupertino zoning before submittal, and every construction phase — framing, electrical, plumbing — gets its own inspection sign-off before we cover it up. Nothing moves forward on an assumption.
What is the cost range for detached and garage-conversion ADUs in Cupertino?
Ground-up detached builds typically run $180,000 to $400,000+ depending on size and finish level; garage conversions and JADUs start lower, around $65,000 to $95,000. We confirm the exact number with an itemized quote after a site visit.
Who reviews the structural engineering on my plans?
A licensed structural engineer stamps every plan set before it goes to the City of Cupertino for permitting — this is standard on our projects, not an optional add-on.
What ADU types do you build?
Detached backyard homes, garage conversion ADUs, Junior ADUs (JADUs), attached additions, and prefab/modular installations, plus standalone architectural design and permitting services — each built to the same inspection standard.
Can a completed ADU be rented out?
Yes. Under California and Cupertino rules a code-compliant, completed ADU can generally be rented long-term. Short-term rental rules vary by city, and we can walk you through the current restrictions for your property.
Is design, permitting, and construction all handled under one contract?
Yes. One general contractor manages architectural plans, structural engineering, City of Cupertino permitting, and construction through final inspection, so the same code-compliance standard applies from the first drawing to the last walkthrough.
Get Your Free Estimate
Ready to build your ADU? Contact us today for a free, no-obligation consultation. We respond to all inquiries within 1 hour.