Can You Build an ADU on Your Property in Sacramento?

If you own a home in the Sacramento area, you’ve probably wondered:

 “Can I actually build an ADU in my backyard?”

Good news:

In 2025–2026, the answer for most Sacramento-area homeowners is “yes, you probably can” – and the law is now written to strongly favor you.

 

California has spent years reforming ADU rules, and both the City of Sacramento and Sacramento County have built entire ADU programs with pre-approved plans, simple online tools, and fast, “ministerial” approvals. 

This guide breaks down, in plain language:

• Who can build an ADU
• What the state must allow you to do
• City vs. County vs. suburbs
• Quick ways to check your own lot
• How A+ Construction ADU Builders can do the homework for you

Short Answer: If You Own a Home, There’s a Very Good Chance You Can Build an ADU

Under current California law and local codes:

• Almost every single-family lot in Sacramento City and Sacramento County can have at least one ADU, as long as you follow basic safety rules. 
• ADUs are also allowed on many duplex and multifamily properties (with even more units possible through conversions). 
• Local governments must process ADU applications ministerially (no hearings) and usually within 60 days of a complete application. 
• There is no owner-occupancy requirement anymore – you don’t have to live in either the main house or the ADU. 

So instead of “Is an ADU allowed at all?” the real questions become:

• What size and type can I build?
• Where can it sit on my lot?
• How many units can I have?

Let’s zoom in by jurisdiction.

Step 1: Where Is Your Property – City, County, or Another Suburb?

 City of Sacramento (within city limits)

If you pay City of Sacramento utilities and your address is inside city limits:

• The City runs an ADU Resource Center with a step-by-step guide and a property lookup tool. 
• The zoning code allows ADUs on most residential parcels (R-1, R-2, R-3, R-4, etc.). 
• The City’s own ADU app notes that, by state law, a building permit is the only approval required; zoning review is optional (offered as a low-cost confirmation, not a barrier). 

In practice, if you have:

• a residentially-zoned lot, and
• an existing or proposed primary dwelling,

…the City will almost always allow at least one ADU up to 800 sq.ft. and usually more, subject to height and setback rules. 

The City also has “Shelf Ready” / pre-approved ADU plans you can use for detached units. 

 Unincorporated Sacramento County (Carmichael, Fair Oaks, Antelope, North Highlands, Orangevale, etc.)

If you’re in a place that’s not a city – e.g.:

• Carmichael
• Fair Oaks
• Antelope
• North Highlands
• Orangevale
• Rural pockets between cities

…you’re under Sacramento County rules.

The County’s 2025 ADU handout says:

“Any property developed with a primary residential use is permitted to have ADUs as provided in Table 1.” 

Key points:

• Detached ADUs can be up to 1,200 sq.ft., attached ADUs up to 50% of the main home or 850–1,000 sq.ft. (depending on bedrooms). 
• Most single-family lots can mix 1–2 ADUs plus a JADU in certain combinations. 
• Standard side/rear setbacks for ADUs are 4 ft, with options for more height if you increase setbacks. 

The County also runs a Shelf Ready ADU program – fully engineered detached ADU plans (460–1,184 sq.ft.) you can use “off the shelf” to speed permitting. 

 Other Suburbs (Folsom, Elk Grove, Rancho Cordova, Citrus Heights, etc.)

If you’re in another incorporated city (Folsom, Elk Grove, Rancho Cordova, Citrus Heights, etc.):

• Each city has its own ADU ordinance…
• But all of them must follow the same state minimums (see next section), which are very generous. 

In most of these suburbs you can expect:

• At least one ADU on a single-family lot, plus often a JADU
• Detached ADUs up to 1,200 sq.ft. (subject to local height/lot coverage) 
• Ministerial approval within 60 days of a complete application
• No owner-occupancy requirement

A+ Construction ADU Builders works in all of these jurisdictions and can quickly check your specific city’s twist on the statewide rules.

Step 2: What California Law Guarantees You Can Build (Baseline Rights)

Regardless of which Sacramento-area city you’re in, California’s 2025 ADU laws and the updated HCD ADU Handbook guarantee some minimums. 

Here’s what that means for you.

Minimum Unit You’re Allowed

You are entitled to build at least one ADU that is:

• Up to 800 sq.ft.
• Up to 16 ft tall (in many cases more, especially near transit) 
• With 4 ft side and rear setbacks

Even if your lot coverage, FAR, or other zoning rules are tight, local governments cannot use those to block this “protected” ADU. 

Impact Fees

• ADUs under 750 sq.ft. are exempt from local impact fees (parks, traffic, etc.). 
• Bigger ADUs may pay impact fees proportional to their size vs. the main house.

This is why 500–750 sq.ft. 1-bedroom ADUs are such a hot sweet spot.

Parking

• Cities and counties can’t require more than 1 parking space per ADU or per bedroom, whichever is less. 
• They must waive parking entirely if:
  • You’re within ½ mile of public transit, or
  • The ADU is a conversion of existing space (house, garage, accessory building), or
  • The area already uses on-street permits and your tenant can’t get one, etc. 

Garage conversion? By law, they cannot make you “replace” those parking spaces elsewhere. 

Owner-Occupancy

As of 2026:

• Local agencies may not impose owner-occupancy requirements on any ADU. That’s locked into statute (Gov. Code § 66315, via AB 976). 
• Only Junior ADUs (JADUs) can still require owner occupancy under separate rules in some jurisdictions.

So you can legally rent both the main house and the ADU if you want.

Pre-Approved Plans (AB 1332)

AB 1332 forces every city and county to run a pre-approved ADU plan program by January 1, 2025, with plans posted online. 

• The City of Sacramento has a Preapproved ADU page complying with AB 1332. 
• Sacramento County’s Shelf Ready plans effectively serve the same function. 

This means you can often start from a vetted plan instead of paying for fully custom drawings from scratch.

Step 3: Quick Ways to Check Your Property

If you want a fast DIY “can I do this?” check:

Option A – City of Sacramento’s ADU Tool (if you’re in the city)

1. Go to the ADU Resource Center and “Step 1: Is an ADU allowed on my property?” page. 
2. Use the address tools and info there:
   • Confirm zoning
   • See basic size/placement rules
   • Browse Shelf Ready ADU plans if a detached unit makes sense for you. 

Option B – Sacramento County’s ADU Handout (if you’re unincorporated)

1. Open the Sacramento County ADU Handout (PDF). 
2. Check:
   • Whether your area is unincorporated (Carmichael, Fair Oaks, Antelope, etc.)
   • The table listing how many units you can have and the allowed sizes.
3. Explore the Shelf Ready ADU plans page to see pre-engineered options. 

Option C – Ask A+ to Do a Feasibility Check

Most homeowners don’t want to nerd out on zoning PDFs and bills like AB 976 or AB 1332.

A+ Construction ADU Builders can:

• Look up your address
• Confirm whether you’re in City, County, or another city
• Give you a quick feasibility snapshot:
  • Yes/no for an ADU
  • Rough maximum size and height
  • Best ADU type (detached, attached, conversion) for your lot

…before you spend a dollar on design.

Common Reasons You Might Be Limited  

It’s rare to get a hard “no,” but you might face some constraints:

• Tiny or oddly shaped lots – you may be limited to smaller ADUs or interior/garage conversions to meet setbacks.
• Multiple existing units – multifamily rules apply, but they usually add options rather than remove them. 
• Easements & utilities – sewer lines, drainage, or utility easements may affect placement.
• HOAs / CC&Rs – state law is very ADU-friendly, but some HOA rules can still complicate design or aesthetics (though outright bans are legally shaky).
• Environmental / hazard zones – floodplain or high fire risk areas may layer on special design or elevation requirements.

Even then, California’s 2025 ADU Handbook is clear: denial is only allowed when a non-conforming issue creates a health and safety problem that’s affected by the ADU. 

In many marginal cases, a smaller footprint or a conversion ADU is still viable.

What If You Already Have an Unpermitted “ADU-ish” Space?

Good news there too.

 

New laws (like AB 2533) created an amnesty path for many unpermitted ADUs and garage conversions built before January 1, 2020:

• Cities must offer a way to legalize these if they can be brought up to health and safety standards, without requiring full modern zoning compliance. 

 

If you have a “mystery studio” over the garage or an old converted space, A+ can help assess whether it’s a candidate for legalization instead of full rebuild.

How A+ Construction ADU Builders Answers “Can I Build an ADU Here?”

Here’s what it looks like when A+ handles the question for you:

 Address + Goals

You tell us:

• Your address
• What you’re thinking:
  • rental income
  • aging parents
  • adult kids
  • guest house
  • future downsizing

 Zoning & Constraints Check

We check:

• City vs. County vs. other city
• Zoning designation and basic ADU rights
• Lot size, shape, setbacks, obvious access issues

This quickly leads to a “yes, and here’s roughly what” or “yes, but it should probably be a conversion / smaller footprint.”

 Concept & Ballpark

From there, we can outline:

• Likely size range (e.g., 500–750 sq.ft. sweet spot vs. 800–1,000+ sq.ft.)
• Best ADU type: detached, attached, over-garage, conversion
• Whether you can take advantage of pre-approved or Shelf Ready plans to save time and design cost. 

Then you can decide if you want a deeper design-build proposal.

Bottom Line: Can You Build an ADU on Your Sacramento Property?

If you:

• Own a single-family home or a small multifamily property in the Sacramento area, and
• Have at least some usable yard, side area, or convert-able garage,

…then there’s a very high chance the law says “yes.”

State law and local programs now exist specifically to make that “yes” easier, not harder.