What Are the Rules for ADUs in Sacramento?

If you're thinking about building an Accessory Dwelling Unit (ADU) in Sacramento, you're probably wondering what rules you need to follow before construction begins.

The good news is that both California law and the City of Sacramento have made it easier than ever for homeowners to build ADUs. However, there are still important regulations regarding permits, size, setbacks, height, parking, and zoning that every homeowner should understand before starting a project.

At Geco Construction Inc., we help homeowners throughout Sacramento and Northern California navigate the entire ADU process—from planning and permits to construction and final inspection. Understanding the local requirements early can save time, money, and unnecessary delays.

What Is an ADU?

An Accessory Dwelling Unit (ADU) is a secondary residential unit built on the same property as an existing single-family or multifamily home.

ADUs can be:

• Detached backyard homes
• Attached additions to the primary residence
• Garage conversions
• Basement conversions
• Above-garage apartments

Each ADU includes its own kitchen, bathroom, sleeping area, and private entrance, allowing it to function as an independent living space.

Do You Need a Permit to Build an ADU in Sacramento?

Yes.

Every legal ADU in Sacramento requires a building permit before construction begins. Depending on your project, you'll also need plan review, inspections, and approval from the local building department.

Starting construction without permits can lead to delays, fines, and costly corrections, so it's important to work with an experienced contractor familiar with Sacramento's permitting process.

Where Can You Build an ADU?

Most residential properties in Sacramento that already have an existing home may qualify for an ADU.

Whether you own a:

• Single-family home
• Multifamily property
• Duplex
• Certain residential lots

there is a good chance an ADU may be permitted, provided your project meets local zoning and building requirements.

What Is the Maximum ADU Size in Sacramento?

The maximum allowable size depends on the type of ADU you plan to build.

Generally:

• Detached ADUs may be up to 1,200 square feet.
• Attached ADUs are subject to additional sizing standards, although California law also provides minimum size allowances for qualifying projects.

An experienced ADU builder can help determine the maximum size allowed for your specific property.

Are There Setback Requirements?

Yes.

Setbacks are the minimum required distance between your ADU and your property lines.

The exact setback requirements vary depending on factors such as:

• Whether the ADU is attached or detached
• Existing structures
• Lot configuration
• Fire safety requirements

Because every property is different, reviewing your site before designing the project is essential.

Is Parking Required?

In many situations, additional parking is no longer required for an ADU under California law, particularly when certain exemptions apply.

For example, parking requirements may be waived if the property is located near public transit or if the ADU is created by converting existing space, such as a garage. Parking requirements depend on your specific project and location.

Can You Convert a Garage into an ADU?

Absolutely.

Garage conversions are one of the most popular and affordable ways to build an ADU in Sacramento.

Converting an existing garage often costs less than constructing a new detached unit because much of the structure is already in place.

Garage conversions typically include:

• New insulation
• Plumbing
• Electrical upgrades
• Windows
• Interior finishes
• Heating and cooling systems

Do ADUs Need Separate Utility Connections?

Not always.

Some ADUs can share utility services with the primary residence, while others may require separate electrical panels or utility upgrades.

Your contractor can determine the most efficient and cost-effective option based on your property's existing infrastructure.

How Long Does It Take to Build an ADU?

Every project is different, but a typical Sacramento ADU timeline includes:

• Planning and design
• Permit approval
• Site preparation
• Construction
• Final inspections

Once permits are approved, construction often takes 6 to 10 months, depending on the size and complexity of the project.

Can You Rent Out an ADU?

Yes.

Many Sacramento homeowners build ADUs to generate rental income.

Others use them as:

• Housing for parents
• Homes for adult children
• Guest houses
• Home offices
• Multigenerational living spaces

Before renting an ADU, homeowners should ensure they understand any applicable local rental regulations.

Common Mistakes to Avoid

Many homeowners unknowingly make costly mistakes when planning an ADU.

Some of the most common include:

• Starting construction before permits are approved
• Underestimating utility connection costs
• Choosing the wrong location on the property
• Hiring an inexperienced contractor
• Failing to budget for site preparation

Planning carefully from the beginning can save both time and money.

Why Homeowners in Sacramento Choose Geco Construction Inc.

Building an ADU is a major investment, and choosing the right contractor is one of the most important decisions you'll make.

At Geco Construction Inc., we proudly help homeowners throughout Sacramento, Elk Grove, Roseville, Folsom, Rocklin, Lincoln, Davis, Auburn, and surrounding Northern California communities navigate every step of the ADU process.

Our services include:

• ADU planning
• Design coordination
• Permit assistance
• Site preparation
• Complete construction
• Project management
• Final inspections

We believe in honest communication, quality craftsmanship, and building ADUs that provide lasting value.

Frequently Asked Questions

Can I legally build an ADU in Sacramento?

Yes. Most residential properties with an existing home may qualify, provided they meet Sacramento zoning and building requirements.

What is the largest ADU I can build?

Many detached ADUs may be built up to 1,200 square feet, depending on your property and local regulations.

Do I need permits?

Yes. Building permits are required before construction begins.

Can I convert my garage into an ADU?

Yes. Garage conversions are one of the most common and cost-effective ADU options in Sacramento.

Does an ADU increase property value?

In many cases, yes. A professionally built ADU can increase your property's value while creating additional living space and potential rental income.

Start Your ADU Project with Geco Construction Inc.

If you're planning to build an ADU in Sacramento, working with an experienced contractor can make the entire process much easier.

At Geco Construction Inc., we help homeowners understand Sacramento's ADU regulations, obtain permits, and build beautiful, high-quality ADUs designed to meet both local requirements and your family's needs.

Contact Geco Construction Inc. today to schedule your consultation and start planning your ADU project.

Geco Construction Inc.Telephone: (916) 267-7954

Address: 8000 14th Ave, Sacramento, CA 95826