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Campbell ADU Permit & Building Guide

Building an Accessory Dwelling Unit (ADU) in Campbell is one of the most rewarding investments a homeowner can make. At Apex Homes, we have helped families create extra living space, generate reliable rental income, and boost property value, all within a streamlined process that can take as little as five months. Whether you are considering a backyard home or unit for multigenerational living, Campbell offers excellent opportunities for ADU development.

 

ADU Regulations in Campbell

Campbell allows ADUs on both single-family and multi-family lots, but the rules vary slightly depending on your property type.

On single-family lots, homeowners can build one detached or attached ADU as well as one Junior ADU (JADU). Detached units may be up to 1,200 square feet, while attached units are limited to 50 percent of the main home’s living area, up to the same maximum size. JADUs, which are created by converting existing space inside the home, can be up to 500 square feet.

Setbacks and height rules are also important. Smaller units—up to 850 square feet or two-bedrooms ADUs under 1,000 square feet—requires only a four-foot setback from side and rear property lines. Units built above garages requires a five-foot setback. Detached ADUs within setback areas are limited to 16 feet in height while attached units outside setbacks can go up to 25 feet.

For multi-family lots, the city allows up to two detached or attached ADUs, each up to 1,200 square feet. Detached units can reach 18 feet in height and must maintain at least six feet of separation from other structures.

 

The Campbell ADU Permitting Process

The permitting process in Campbell follows California’s streamlined, ministerial approval path for ADUs. Homeowners start by reviewing the city’s ADU guidelines and confirming zoning compliance. Next comes the preparation of architectural plans, a site plan, and a Title 24 energy report. Once ready, the full application is submitting online through Campbell’s MyGovernmentOnline (MGO) portal.

By state law, the city must review and respond to ADU applications within 60 days. Once approved, you can move forward with construction, inspections, and final approvals through the same portal. While not required, Campbell encourages a pre-submittal consultation with the Planning Division, which can help clarify requirements and reduce surprises later in the process.

 

Pre-Approved ADU Plans in Campbell

One of the biggest advantages for homeowners in Campbell is access to the city’s Pre-Approved ADU Program. These plans are created by licensed architects and meet all local and state building codes. By choosing a pre-approved design, homeowners can save on design costs and reduce permitting time, making it much faster to start construction. These plans are especially well-suited for detached backyard ADUs, which are among the most popular choices for Campbell homeowners.

Currently, Campbell’s pre-approved models include:

 

749 2B2B

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

495 1B1B

Compact
Compact. Clever. Complete
495 sq.ft. 1 Bed 1 Bath
495 1B1B
$168,500
View Product Plan

991 3B2B

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

1194 3B2B

Deluxe
Bright. Balanced. Beautiful.
1194 sq.ft. 3 Bed 2 Bath
1194 3B2B
$388,000
View Product Plan

 

Why Build an ADU in Campbell?

Campbell is a vibrant community tucked into the heart of Silicon Valley, just southwest of San Jose. Like much of the Bay Area, it faces a persistent housing shortage, which creates a strong demand for well-designed rental units. A thoughtfully built ADU in Campbell can easily rent for $2,000 to $3,500 per month, depending on size and finishes. Professionals working in nearby tech companies, students, and retirees alike look for modern, private housing options, making ADUs a reliable source of long-term rental income.

The financial benefits don’t stop at monthly rent. Adding an ADU can increase a home’s value by 15 to 30 percent or more. Appraisers count ADUs as part of the property’s usable living space, and buyers increasingly see them as a valuable assets. With Campbell’s desirable school districts and established neighborhoods, homes with ADUs often stand out in the market.

For many homeowners, though, the most meaningful advantages of an ADU is the flexibility it brings to family living. An ADU can house aging parents who want independence while staying close to loved ones, provide a private space for extra living, or serve as a comfortable home for a live-in caregiver. Guests and long-term visitors also benefit from the privacy and convenience of their own dedicated space.

For more detailed information or specific guidance, we can book a free consultation with an Apex Home ADU expert. Let us help you transform your property with a thoughtfully planned ADU today!


FAQs

How much does an ADU unit cost in Campbell?

Typical costs range from $300–$350 per square foot with Apex Homes predesigned ADU floor plan.

Can I choose upgraded interior materials in Campbell?

Yes, we provide upgraded interior options for all of our ADU models.

What appliances can I expect in my ADU from Apex Homes?

Our ADUs usually come equipped with several essential appliances:
Stove, Cooktop, Oven, Dishwasher, Water heater, HVAC system, Solar Panel, Washer and dryer (Upgrade), Refrigerator (Upgrade)

Can I have financial options for my ADU in Campbell?

Yes, we work directly with lenders to simplify your ADU journey.