ADU Builder in Antioch, CA

Turn Your Backyard Into Extra Income or Room for Family

★★★★★ 5.0 · 61 Google reviews 20+ Bay Area cities served Backed by AlphaX RE Capital

Free feasibility study · No obligation · Answers in one call

SMARTER THAN MOVING

You Don't Need a New Home. You Need a Second One.

Moving is expensive, stressful, and unnecessary when the space you need already exists on your own lot. With Apex Homes, you can house family, add income, and increase your property's value, all without changing your address.

Same Address, More Space

No new mortgage, no new school district, no goodbye to the neighbors you know. Just more space, right where you are.

Certainty You Won't Get From a Move

No bidding wars, no move-in surprises, no guessing what a new house actually needs. Just a fixed price, on the property you already know.

A Home of Their Own, Steps From Yours

Parents, grown kids, or whoever needs it get their own front door and their own space, close enough to see every day.

Why Antioch Homeowners Build With Apex Homes

One team handles the entire process under one roof, so you don't have to coordinate a separate architect, permit expediter, and contractor yourself.

  • Free Feasibility Study: A walk-through of what your Cupertino lot allows, in plain language, before you spend a dollar on design.
  • One Team, Start to Finish: Design, permits, and construction all stay with Apex Homes, so you're not managing three different vendors.
  • Fixed Price, Honest Timeline: Your quote is agreed upfront and doesn't move. Construction runs about 6 months once permits are approved.
  • Backed by AlphaX RE Capital: Real estate financing and operations expertise behind every build.
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Why Cupertino homeowners build with Apex Homes

How It Works in Antioch

We manage every step of design, permitting, and construction, so you don't have to navigate city rules on your own.

1

Free Feasibility Study

Apex Homes reviews your lot's zoning, setbacks, and utility hookups before any commitment.

2

Select a Floor Plan

Choose from Apex Homes' Cupertino-ready floor plans, or go fully custom.

3

Permit Submittal

Apex Homes compiles and submits your complete permit package to the city.

4

City Review

Apex Homes monitors the review and responds directly to any city comments.

5

Construction & Inspections

Apex Homes manages the full build through final sign-off.

One team, all-in-one: design, permits, and construction, without you having to coordinate a separate architect, expediter, or contractor.

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ZONING AT A GLANCE

Single-Family Lots (R-1)

Up to 1,000 sq ft, plus a Junior ADU. Standard setback and height limits apply, your free feasibility study confirms the exact numbers for your lot.

Multi-Family Lots (R-2+)

Up to two detached ADUs, each up to 1,200 sq ft, with options to convert existing garage or storage space.

What Your Backyard Is Costing You

Every year that yard sits unused in Cupertino is rent, equity, and space someone in your family could actually be using.

$3,000–$4,000/mo

Left on the table. That's what a well-built two-bedroom ADU could be earning you right now, driven by steady demand from Cupertino's tech employers.

Six figures

In equity your property isn't capturing yet. A legal, permitted ADU is one of the few upgrades that adds this much value to a Cupertino home.

Multigenerational

Without it, aging parents, adult kids, or long-term guests are stuck choosing between crowding your home or leaving Cupertino altogether.

None of that has to stay true. Here's what changes once you build.

ADU Floor Plans in Antioch

Every floor plan includes architectural drawings, structural engineering, and Title 24 compliance.

495 1B1B

Compact
Compact. Clever. Complete
495 sq.ft. 1 Bed 1 Bath
495 1B1B
$205,000
View Product Plan

749 2B2B

Most Popular
Double. Dynamic. Delightful.
749 sq.ft. 2 Bed 2 Bath
749 2B2B
$278,000
View Product Plan

991 3B2B

Essential
Spacious. Smart. Sophisticated.
991 sq.ft. 3 Bed 2 Bath
991 3B2B
$350,000
View Product Plan

Serving Antioch and the Surrounding Cities

Apex Homes builds ADUs across 20+ Silicon Valley and Bay Area cities. Find your city below for local pricing, regulations, and permitting timelines.

Homeowners Love Building With Apex Homes

★★★★★

"I'm usually stingy with five-star reviews, but Apex Homes absolutely rocks. From the first call, they treated my scattershot sketches like gold: polished the design, wrangled the permits so I never saw City Hall, and kept every penny transparent."

Meredith Munger · Google Review

★★★★★

"The most professional people you will meet. They know what they are doing."

Bao Tran · Google Review

★★★★★

"Best team to have on your side to guide you through your home renovation. Extremely professional and knowledgeable."

Laurie Darling · Google Review

★★★★★

"Aimee is so personal and knowledgeable! Explains all the questions I could ever think of."

Eva Panina · Google Review

Recent Apex Homes ADU Projects

A look at completed Apex Homes ADU builds across the Bay Area.

991 Sqft | 3B2B

991 Sqft | 3B2B


service includes:

DesignPermitBuildFinish Materials

A 991 sq ft 3-bed / 2-bath detached ADU in San Jose, fully condo-converted under AB 1033 and ready for separate sale — either the main house or the ADU can be acquired, financed, and resold on its own.

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983 sqft 3B3B

983 sqft 3B3B


service includes:

DesignPermitBuildFinish Materials

Set on a corner lot in San Jose, this 983 sqft, two-story ADU is positioned at the rear of the property. It's a placement that lets a growing family live together today, and converts just as easily to a rental down the road.

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749 sqft | 2B2B

749 sqft | 2B2B


service includes:

DesignPermitBuildFinish Materials

A 749 sq ft, 2-bed / 2-bath detached ADU in San Jose, built turnkey alongside a full remodel and ADU-title-conversion of the existing main house. The owner ends up with two independent rental units on a single 7,800 sq ft lot.

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1200 sqft | 3B2B

1200 sqft | 3B2B


service includes:

DesignPermitBuildFinish Materials

A 1,200 sq ft, 3-bed / 2-bath detached ADU added to a duplex lot in central San Jose — taking the property from two income units to three, with the new ADU placed at the rear of a deep narrow lot and four mature trees preserved through construction.

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view all projects

Apex Homes vs. Other Antioch ADU Builders

Design-builders, general contractors, and prefab vendors each cover part of the job. Apex Homes covers all of it, in-house.

Apex
Homes
Other
Design-Builder
Other
Contractor
Other
Pre-Fab Vendor
Free Feasibility Study
Pre-Approved Design Options
Maybe
Full Permit Handling
Maybe
In-house Project Management
Maybe
Solar Installations Included
Maybe
Maybe
On-time, On-budget
Transparent Pricing
Move-In Ready Interior
Maybe
Maybe

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Turn your Antioch backyard into extra income or a home for family, without moving.

Free feasibility study: zoning, buildable size, and matching floor plans in one call. No obligation.