Quick answer
Planning approval is a city or county sign-off that a project meets the zoning code and land-use rules, given before or alongside the building permit.
It answers whether the project is allowed on that lot, in that spot and at that size. For a compliant ADU in California, it must be ministerial: staff check fixed rules, with no hearing.
Quick facts
Key takeaways
- Planning approval is the zoning “yes” on your project.
- It is separate from the building permit, though cities often bundle them.
- Some approvals are ministerial (rule-checking). Others are discretionary (judgment and often a hearing).
- In California, a compliant ADU must get ministerial approval, with no hearing 3.
- Outside California, an ADU may still need a hearing or a conditional use permit.
What planning approval means, in plain English
Before you build, the city asks two things. Is this allowed here? Is it built safely? Planning approval answers the first question.
In the UK the same idea is called “planning permission.” In the US you may hear “zoning approval,” “zoning clearance” or “entitlement.”
Some projects get it in a quick staff check. Others go to a public hearing where a board can say yes, no or yes with conditions.
Why planning approval matters to you
Without it, the building permit cannot issue. The project waits.
The kind of approval decides your timeline and risk. A staff check follows set rules. A hearing can bring neighbors, conditions and delay.
In California, the law takes the hearing off the table for a compliant ADU. That makes approval far more predictable.
Lenders and buyers care too. A unit built without planning approval may not count as a legal home. That can affect a loan, an appraisal or a sale years later. Our research on legalizing unpermitted ADUs shows how hard that fix can be.
Kinds of planning approval
| Kind | Who decides | Hearing? | Typical use |
|---|---|---|---|
| Ministerial approval or zoning clearance | Staff, using fixed rules | No | A California ADU that meets the rules 3 |
| Administrative permit | A staff decision with some judgment | Sometimes notice, often no hearing | Minor exceptions in some cities |
| Variance | Zoning administrator or board | Usually yes | Relief from a rule due to a lot hardship 4 |
| Conditional use permit | Zoning administrator, board or commission | Usually yes | Uses allowed only with conditions 4 |
| Design review | Staff or a design board | Depends | Looks and fit; must be objective for California ADUs |
| Rezoning | City council or county board | Yes | Changing the rules for a parcel |
How planning approval works for an ADU
- Confirm your zone and the ADU rules with the planning department.
- Prepare a site plan showing the ADU, setbacks, height and parking.
- Submit the application, often in one portal with the building plans.
- Staff check completeness and then check each zoning rule.
- You answer any correction comments.
- Staff sign off zoning. The building permit can then issue once building review is done.
- Zoning lookupConfirm the district and the local ADU rules
- Application filedSite plan and building plans, often in one portal
- Completeness checkIn California, written notice within 15 business days 3
- Planning reviewSetbacks, height, size, parking and overlays against the code
- Planning sign-offZoning is cleared; this is the planning approval
- Building plan checkStructure, fire, energy and plumbing reviewed against the building code
- Permit issuedOnly now can construction start
Source: [3]
The diagram places planning approval in the whole permit path. It is the zoning check in the middle, not the permit itself, so a planning sign-off alone does not let work start.
What planning staff usually check on an ADU
| Item | What they look for | Where it shows on your plans |
|---|---|---|
| Zone and use | That an ADU is allowed on the lot | Cover sheet |
| Setbacks | Distance from each wall to each lot line | Site plan dimensions |
| Height | Height to the point the code defines | Elevations |
| Size | Floor area within local and state limits | Floor plan area table |
| Parking | Spaces, or the reason none are needed | Site plan notes |
| Easements | That nothing is built over a recorded easement | Site plan and survey |
| Overlays | Any extra rule, such as coastal or historic | Notes and any added reports |
Documents that usually go into a planning submittal
Lists vary by city. These items come up most often for an ADU.
- An application form with owner and parcel details.
- A site plan with the house, the ADU, every lot line and every setback.
- Floor plans with the floor area of the ADU.
- Elevations showing height and roof shape.
- A survey or title report if easements or lot lines are unclear.
- Photos of the lot and any structure being converted.
- Any extra report an overlay calls for, such as a soils or fire report.
Worked example: same ADU, two review paths
A hypothetical detached ADU that meets the local size and setback rules, for illustration only. One lot is in California. The other is in a city, outside California, that requires a conditional use permit for ADUs.
| Step | California lot | Lot with a conditional use permit |
|---|---|---|
| Who decides | Planning staff | A hearing body |
| Public hearing | No 3 | Yes, with notice to neighbors |
| Can conditions be added? | Only objective standards in the code | Yes, at the body’s discretion |
| Clock | Approve or deny within 60 days of a complete application, with a home on the lot 3 | Set by local rules |
| Risk of denial for a compliant plan | Low; review is rule-based | Higher; judgment involved |
The building is the same. The path is not. That is why the kind of planning approval matters as much as the design.
Second example: when a California ADU still needs more than planning approval
Hypothetical situations, for illustration only. Each is a California lot.
| Situation | Planning approval | What else may apply |
|---|---|---|
| Backyard ADU, flat lot, no overlays | Ministerial zoning check | Building permit only |
| ADU in the coastal zone | Ministerial ADU check | Coastal rules may add a step; see the coastal research |
| ADU plus a new main house | Ministerial for the ADU | The house follows its own review path |
| ADU that breaks a local objective rule | Corrections or denial | Redesign to meet the rule |
Ministerial review covers the ADU itself. Other laws can still apply to the lot. Our coastal zone research covers one common case.
Where you will see planning approval
- The permit portal, as a “planning” or “zoning” review step.
- A stamp or signature on your approved site plan.
- A zoning clearance letter in some cities.
- A notice of decision, for discretionary approvals.
- The permit record a buyer or lender may pull later.
California’s rule: ministerial approval for ADUs
California Government Code section 66317(a)(1) says an ADU permit application shall be considered and approved ministerially without discretionary review or a hearing. It applies even where local rules on variances or special use permits would otherwise call for one 3.
Section 66316 says a local ADU ordinance must provide an approval process that includes only ministerial provisions 2. Section 66315 adds that section 66314 sets the maximum standards a city may use for an ADU on a lot with a single-family home 1.
Timing is set in section 66317 too. The agency must give written notice on completeness within 15 business days. It must approve or deny within 60 days of a complete application when a home already exists on the lot 3.
These rules moved from Gov. Code 65852.2 into Chapter 13 under SB 477 (Stats. 2024, ch. 7).
SB 543 (Stats. 2025, ch. 520) amended and renumbered parts of Chapter 13 again from 1 January 2026, so check that a city handout cites the current sections.
The ministerial approval page covers what “objective standard” means; this page focuses on where the approval sits in the process.
The cards below show what changes for you when review is ministerial instead of discretionary.
Ministerial (California ADUs)
Discretionary (many other permits)
- A board or hearing officer weighs the project
- Neighbors can usually speak at a hearing
- The decision maker may add conditions or say no
- Timing depends on hearing calendars and appeals
Source: [3]
Planning approval in other states
Outside California, the path varies. Some states require cities to approve ADUs by staff review. Others let cities require a hearing or a conditional use permit.
Check ADU laws by state and your city’s code. The American Planning Association’s history of zoning enabling acts shows why procedures differ by state 5.
Costs and what drives them
Many cities charge a planning review fee as part of the permit. Discretionary approvals often cost more, because they need notice and a hearing.
Time is the larger cost. Each correction round adds designer hours and pushes back construction.
See the ADU permit fees guide, California fees by city and the fee estimator for drivers.
Benefits and limits of ministerial planning approval
What it does well
- Predictable: the rules are fixed and written.
- No hearing, so neighbors cannot block a compliant plan.
- A state clock in California limits delay.
Where it falls short
- No flexibility: a plan that misses a rule must be redesigned.
- Odd lots may not fit fixed rules well.
- Other laws, such as coastal rules, can still add steps.
Planning approval compared with related steps
| Step | What it confirms | Who gives it |
|---|---|---|
| Planning approval | Zoning: allowed use, place and size | Planning department |
| Building permit | Safe construction plans | Building department |
| Plan check | Detailed review of drawings | Building, sometimes planning |
| Final inspection | The built unit matches the plans | Building inspector |
| Certificate of occupancy | The unit may be lived in | Building department |
Common misreadings
- Myth Planning approval is the permit.
- Reality It is one part. The building permit still has to issue.
- Myth Every ADU in California goes to a hearing.
- Reality State law requires ministerial approval with no hearing for ADU applications.
- Myth Ministerial means automatic.
- Reality Staff still check every rule. A plan that misses one gets corrections or a denial.
- Myth Neighbors can appeal a compliant California ADU.
- Reality There is no discretionary decision to appeal, though rules on appeals vary by city.
What to ask about planning approval
- Is planning review part of the same application as the building permit?
- What makes an ADU application complete here?
- Which objective standards will staff check?
- Do any overlays on my lot add a review step?
- How will I get the completeness notice?
Checklist for your project
- Confirm your zone and ADU rules with the planning department.
- Check the lot with the feasibility checker.
- Draw a full site plan with every dimension.
- Submit a complete package and note the date.
- Track the completeness notice and the decision clock.
- Answer corrections fast and in one round if you can.
Related guides and research
Questions about planning approval
What is planning approval?
It is the city or county sign-off that a project meets zoning. It confirms the use, location and size are allowed. A building permit still has to issue after or alongside it.
Do ADUs need planning approval?
Yes, nearly always some zoning review. In California, it must be ministerial, meaning staff check fixed rules with no discretionary review or hearing.
Is planning approval the same as a building permit?
No. Planning approval covers zoning. The building permit covers safe construction. Many cities process both in one application, but they are separate reviews.
How long does planning approval take for an ADU in California?
The agency must say if the application is complete within 15 business days. It must approve or deny within 60 days of a complete application when a home already exists on the lot.
Can neighbors stop my ADU at planning approval?
In California, a compliant ADU is approved without a hearing, so there is no public hearing to stop it. Outside California, it depends on the local process.
What is the difference between ministerial and discretionary approval?
Ministerial approval checks fixed, objective rules. Discretionary approval lets a person or board weigh the project and add conditions, usually after a hearing.
What is a zoning clearance?
It is a term some cities use for a ministerial planning approval. It confirms the plan meets zoning so the building permit can move ahead.
What is planning permission?
Planning permission is the UK term for the same idea. In the US, people say planning approval, zoning approval or entitlement.
What happens if planning approval is denied?
The city must say why. Usually it is a rule the plan does not meet. You can redesign and resubmit. Appeal options depend on local rules.
Do I need a variance for an ADU?
In California, a compliant ADU should not need one, since state law caps the standards. Elsewhere, a variance may be needed if your lot cannot meet a local rule.
Sources
- California Legislature, Government Code §66315, maximum ADU standards, retrieved .
- California Legislature, Government Code §66316, ministerial-only ADU approval process, retrieved .
- California Legislature, Government Code §66317, ministerial review and timelines, retrieved .
- California Legislature, Government Code §65901, variances and conditional uses, retrieved .
- American Planning Association, Standard State Zoning Enabling Act and Standard City Planning Enabling Act, retrieved .
Expert review
Written by the HyreADU Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Government Code §§66315, 66316, 66317 and 65901 were read on leginfo.legislature.ca.gov on 8 October 2026. The ministerial rule, the 15-business-day completeness notice and the 60-day decision were confirmed in the current §66317 text. Examples use hypothetical projects only. Education, not legal advice.
Suggest a correction. We fix errors and say what changed.