If you want to build an ADU in Sacramento, the short answer is: yes, many homeowners can. But before you spend money on plans or construction, you need to know which rules apply to your property.
This guide is for properties in Sacramento city limits.
Can you build an ADU in Sacramento?
Yes, in many cases you can.
Sacramento allows ADUs on many residential properties where there is already a home on the lot or where a home will be built. The exact rules depend on your property and on which Sacramento ADU rule option applies to your project.
Which Sacramento ADU rules apply to your project?
This is the most important thing to understand before you start.
Sacramento currently has two ADU rule options:
- Sacramento’s local ADU rules
- Sacramento’s state-standards ADU rules
Can you choose which option to use?
Usually, yes.
In practical terms, you usually start by choosing the path you want to use. But your project still has to qualify under that path’s rules.
That means:
- you can usually choose the option
- but you cannot use an option your project does not actually meet
Option 1: Sacramento’s local ADU rules
This option uses Sacramento’s own city ADU rules.
This path may work well if your project fits the city’s local standards and you want to use the flexibility built into Sacramento’s local rules.
For example, on a lot with a single-unit home, Sacramento’s local rules may allow:
- up to 2 ADUs
- or 1 ADU and 1 JADU
- or 2 JADUs
Another important difference: under the local option, an ADU or JADU may be rented for less than 30 days if it follows Sacramento’s short-term rental rules.
Option 2: Sacramento’s state-standards ADU rules
This option uses the state ADU rules that Sacramento must allow for qualifying projects.
This path is often important when a project depends on a specific state-protected allowance.
Examples include:
- certain ADUs created from existing space
- the detached 800-square-foot ADU allowed under the state-standard setup
- some multifamily ADU allowances
Another important difference: under the state-standards option, ADUs and JADUs may not be rented for less than 30 days.
Simple takeaway
The easiest way to think about it is:
- Local option = Sacramento’s own ADU rules
- State-standards option = the state ADU rules Sacramento must allow
- you usually choose the path
- the better path depends on your lot and what you want to build
What should you check before you spend money?
Before paying for plans, check these basics:
- Is the property inside Sacramento city limits?
- Is there already a home or other residential building on the lot, or will one be built?
- Do you want a detached ADU, attached ADU, conversion ADU, or JADU?
- Does the lot have special issues like historic status, slope, easements, utilities, levee limits, or access problems?
Sacramento also offers an Optional Zoning Review that can help you confirm whether your ADU appears to meet the city’s zoning standards before you pay for a full permit application.
What types of ADUs are allowed in Sacramento?
Most Sacramento ADU projects fall into four basic categories:
- Detached ADU — a separate building on the lot
- Attached ADU — built onto the main home
- Conversion ADU — created from existing space, such as part of the house, a garage, a basement, or another structure
- JADU — a junior accessory dwelling unit inside a single-family home or attached garage
A JADU is different from a full ADU and may be up to 500 square feet.
Can you build just one ADU?
Yes.
You can build just 1 ADU if that is all you want. Sacramento’s rules tell the city what it must allow in qualifying cases. They do not require you to build the maximum number of units your lot may support.
How many ADUs can you have?
The answer depends on the property type and the rule option.
If you have a single-family home
Under Sacramento’s local option, a lot with a single-unit home may have:
- up to 2 ADUs
- or 1 ADU and 1 JADU
- or 2 JADUs
Under Sacramento’s state-standards option, a lot with a single-family home may qualify for:
- 1 ADU and 1 JADU within existing or proposed space
- plus 1 detached new ADU up to 800 sq. ft. in certain cases
If you have an existing multifamily building
Under Sacramento’s state-standards option, the property may allow:
- ADUs inside existing non-livable space, up to one or 25% of the existing unit count, whichever is greater
- plus up to 8 detached ADUs, as long as the detached ADU count does not exceed the number of existing units on the lot
If you are building a new multifamily project
Under Sacramento’s state-standards option, the lot may allow:
- up to 2 detached ADUs
How big can an ADU be in Sacramento?
Attached ADU size
Under Sacramento’s local rules, an attached ADU may be up to:
- 50% of the existing main house, or
- 850 sq. ft. for one bedroom or less, or
- 1,000 sq. ft. for more than one bedroom
Whichever number is greater usually applies.
Detached ADU size
Under Sacramento’s local rules:
- one detached ADU may be up to 1,200 sq. ft.
- if there are two detached ADUs, their combined size may not exceed 1,200 sq. ft.
JADU size
A JADU may be up to 500 sq. ft.
Simple size takeaway
For most homeowners, the easiest way to think about it is:
- attached ADU: tied to the size of the main house, with protected minimum sizes
- detached ADU: usually up to 1,200 sq. ft.
- JADU: up to 500 sq. ft.
How tall can an ADU be?
That depends on which path you use.
Under Sacramento’s local option, height usually follows the normal zoning height for the lot.
Under Sacramento’s state-standards option, a detached ADU may usually be up to:
- 18 feet
- or 20 feet in some cases if extra height is needed to match the roof pitch of the main home
What setback rules should you expect?
Setbacks in Sacramento are more detailed than many websites make them sound.
Under the local option, setback rules can change based on:
- how close the ADU is to the front of the lot
- whether it is a new ADU or a conversion
- whether the property is historic
- whether the ADU is more than 60 feet from the front property line
The easiest simple summary is:
- many new detached ADUs must meet small side and rear setbacks
- conversions of existing structures may get more flexibility
- Sacramento requires at least 4 feet between the main home and a detached ADU
- Sacramento also requires at least 4 feet between two detached ADUs
Because setbacks can vary, this is one of the first things to confirm before paying for full plans.
Do you need parking for an ADU in Sacramento?
Usually, no minimum parking is required.
Sacramento’s current ADU review materials say there are no minimum vehicle or bicycle parking requirements for ADUs. That is one of the most useful local rules to know early.
Do you need a permit?
Yes.
A legal ADU in Sacramento needs a building permit before construction starts.
Sacramento also offers an Optional Zoning Review, which can help homeowners check whether a project appears to meet the city’s standards before they move into full permit review.
How long does approval usually take?
If there is already residential use on the lot, Sacramento usually must approve or deny a completed ADU application within 60 days.
If the ADU application is submitted together with a new residential development, timing can work differently.
The key word here is completed. A complete application matters.
What documents do you usually need?
For Sacramento’s Optional Zoning Review, the city commonly asks for:
- a full-size PDF plan set
- a site plan
- a floor plan
- building elevations
- site and neighborhood photos
- the application form
- required fees
- a letter of agency if someone other than the owner is applying
For a full permit application, Sacramento’s building materials say complete plan sets typically include:
- a cover sheet
- site or plot plan
- structural plans
- electrical layout plan
- California Energy Code documents
- CalGreen documents
- PV solar plans
What Sacramento rules do homeowners often miss?
These are easy to overlook:
- Sacramento offers free permit-ready ADU plans for city residents
- ADUs under 750 sq. ft. are generally exempt from local impact fees
- school district fees may still apply
- a separate water meter tap is generally not required
- some ADUs may need solar or PV plans
- historic properties may have extra design rules or review requirements
Can you rent the ADU?
Usually, yes. But rental rules depend on which path the ADU uses.
- Under Sacramento’s local option, an ADU or JADU may be rented for less than 30 days if it follows the city’s short-term rental rules
- Under Sacramento’s state-standards option, an ADU or JADU may not be rented for less than 30 days
Can you sell the ADU separately?
Usually, no.
In general, an ADU may not be sold separately from the primary residence except in limited situations allowed by California law.
For most homeowners, the practical answer is:
- you can usually rent it
- you usually cannot sell it separately
What if the property is historic?
Historic properties can have extra rules.
If the property is in a historic district or includes a historic resource, Sacramento may require:
- extra design standards
- preservation review
- additional project review before approval
What is the smartest next step?
The smartest next step is to check your lot before paying for full plans.
Start by confirming:
- which Sacramento ADU path fits your property
- what type of ADU you want
- whether your lot has special constraints
- what your likely permit path will be
- whether optional zoning review would help
That early step can save time, money, and redesigns later.
Bottom line
Yes, many homeowners can build an ADU in Sacramento. But the final answer depends on the lot, the ADU type, and whether the project follows Sacramento’s local ADU rules or the state-standards ADU rules.
If you understand that part first, the rest of the process becomes much easier.
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If you are planning an ADU in Sacramento, Good Life Construction can help you understand what may work on your lot, compare ADU options, and move forward with more confidence before you invest in full plans or construction.
Disclaimer
This page is for general information only. Sacramento ADU rules can change, and some projects depend on lot-specific conditions, permit path, and local review. Always confirm current requirements with the City of Sacramento and your licensed project team before building.
