ADU Builder in Cupertino, CA
Cupertino is home to Apple Park and one of the most consistently high-demand rental markets in all of Silicon Valley. With a housing shortage that shows no sign of easing, demand for well-built rental units in Cupertino is driven by Apple employees, contractors, and tech workers at neighboring companies who want to live close to work. An ADU here isn’t speculative — it’s a reliable income-producing asset in a zip code where rents hold strong year after year.
Apex Homes builds ADUs throughout Cupertino, managing the entire process from zoning review and permit drawings through construction and final sign-off. We also carry three city-recognized pre-approved ADU plans, which significantly cut down the review time compared to a custom submission.
ADU Regulations in Cupertino
Cupertino follows California’s state ADU framework with its own local size and height standards. The rules differ slightly depending on lot type.
Single-family lots (R-1)
- One detached or attached ADU + one Junior ADU (JADU) per lot
- Size: 1-bedroom detached ADUs up to 850 sq ft; 2-bedroom or larger up to 1,000 sq ft; attached units also capped at 50% of the primary home’s floor area; JADUs up to 500 sq ft
- Setbacks: 4 ft from side and rear property lines
- Height: 16 ft for detached ADUs under 800 sq ft; units over 800 sq ft may require additional city review
Multi-family lots (R-2+)
- Up to 2 detached ADUs (each up to 1,200 sq ft)
- Existing non-livable space (garages, storage rooms, utility areas) may be converted to ADUs
- Up to 25% of existing units can be converted to attached ADUs
Apex Homes verifies your zoning classification, calculates setbacks and lot coverage, and confirms height eligibility — at no cost, before any design work begins.
Build Your ADU in Cupertino
Check your property’s ADU eligibility in ParcelZ. Buildable area, compatible floor plans, and estimated feasibility. Free, no account required.
The Cupertino ADU Permitting Process
Cupertino uses an online permitting portal for ADU applications, which makes submittal straightforward and reduces back-and-forth with city staff. Standard review runs 60–90 days. Choosing one of Cupertino’s pre-approved ADU plans shortens that to approximately 30 days, since the city has already completed most of the design and code review for those models — only site-specific conditions need to be verified.
Free Feasibility Study
Apex starts with a full zoning check: lot size, setbacks, height eligibility, lot coverage, and utility connection points. We confirm your property qualifies and identify which pre-approved plan sizes work for your site.
Select a Floor Plan
Choose from one of Apex’s three Cupertino pre-approved designs (listed below), each sized to fit within the city’s tiered limits. If your project needs a custom design, we handle that too, with a full permit package prepared in-house.
Online Permit Submittal
Apex compiles and submits the complete permit package through Cupertino’s online portal — site plan, floor plans, structural details, and Title 24 energy compliance. A thorough, complete submittal minimizes the city’s need to send correction notices.
City Review
Pre-approved plans typically receive approval in ~30 days. Custom designs typically take 60–90 days. Apex monitors the review and responds directly to any plan-check comments.
Construction & Inspections
After permit issuance, Apex manages the full build through foundation, framing, MEP rough-in, city inspections, and final certificate of occupancy.
Pre-Approved ADU Plans in Cupertino
Cupertino offers several pre-approved ADU designs, giving homeowners a faster, lower-cost path to approval. With these models, the city has already completed most of the design and code review, so only site-specific conditions need to be checked.
These plans come with architectural drawings, structural layouts, foundation details, and Title 24 compliance documents. By selecting a pre-approved option, homeowners benefit from faster approvals, lower design costs, and the assurance that the unit meets city standards.
Does a plan fit your lot?
Use ParcelZ to instantly see which of these plans fit your property — free, no signup.
Why Build an ADU in Cupertino?
Cupertino’s strong housing demand makes ADUs an excellent investment. A well-designed ADU can generate significant rental income: two-bedroom units often rent for $3,000–$4,000 per month, which can add up to $100,000 annually. Beyond the rental potential, ADUs also boost property value, often increasing home equity by six figures.
For many families, ADUs provide flexibility for multigenerational living. They offer private space for aging parents, adult children, or long-term guests, all while keeping loved ones close.
Cupertino also supports ADU development with reduced impact fees, pre-approved designs, and an efficient online permitting system. This makes the process faster and more affordable than in many neighboring cities.
Have questions? Contact Apex Homes Today
We build ADUs throughout Cupertino and know the city’s pre-approved plan requirements, and what the local market will support. Call us for a free, no-pressure conversation about your property. We’ll tell you exactly what’s possible.