California city planning guide
Arroyo Grande ADU Guide: Rules, Pre-Approved Plans & Permits
Planning an ADU in Arroyo Grande? Start with the City’s December 2025 rules, check whether one of its regional pre-approved plans fits your property, then build the site-specific permit file the City still requires.
Start with the current rule set
Do not plan from an older Arroyo Grande ADU article or ordinance excerpt.
The California Department of Housing and Community Development found compliance problems with Arroyo Grande’s earlier Ordinance No. 733 in October 2025. The City then adopted updated ADU regulations on December 9, 2025 and now directs homeowners to that current ordinance and its updated ADU handout.
Open the City’s current ADU hub → · Read HCD’s October 2025 findings →
Current city snapshot
The Arroyo Grande numbers homeowners usually need first.
| Planning metric | Arroyo Grande framework | California baseline to keep in mind |
|---|---|---|
| Maximum size | ADUs up to 1,200 sq. ft.; attached ADUs are further limited to 50% of the main home’s size. JADUs are up to 500 sq. ft. | A local ordinance cannot set a maximum below 850 sq. ft., or 1,000 sq. ft. for an ADU with more than one bedroom. |
| Height | 18 ft. for detached ADUs. Attached ADUs or ADUs over garages may reach 25 ft., limited to two stories. | State law establishes minimum height allowances and requires higher allowances in specified circumstances; verify which pathway applies before fixing a design height. |
| Setbacks | Side and rear: 4 ft.. The City handout shows front setbacks can range from 0–20 ft. depending on context. No new setback is required when an ADU stays within an eligible existing footprint. | Local agencies generally cannot require more than 4 ft. side and rear setbacks for new-construction ADUs covered by State ADU Law. |
| Review | Ministerial—no discretionary hearing. City handout says completeness is checked within 15 days and approval or denial occurs within 60 days. | California ADU law similarly requires a streamlined ministerial process; the HCD handbook should be checked for the current statewide timing rules. |
These are planning starting points, not a parcel approval. Easements, fire access, utilities, stormwater, historic conditions, slope, an existing structure and other site facts can still change what is feasible.
The local shortcut worth checking
Arroyo Grande has a real pre-approved ADU plan program.
Arroyo Grande participates with Atascadero, Grover Beach and Morro Bay in a regional stock-plan program. The City currently offers six layout families ranging from a 316 sq. ft. studio to a 1,007 sq. ft. two-bedroom unit, with four architectural styles. The building plans are pre-reviewed, but your property and site plan are not.
Efficiency or Studio
Start here when yard area, construction budget or utility scope is the main constraint. Compare the City’s efficiency and standard studio plan sets.
One Bed, One Bed+ or Loft
The City program includes multiple one-bedroom configurations. Compare footprint and site fit before assuming a larger plan is better.
Two Bed+
The largest current stock-plan option reaches 1,007 sq. ft. Verify setbacks, utilities, site access and total project cost before choosing it.
Permit sequence
A practical Arroyo Grande ADU planning path
Confirm the parcel is actually in City jurisdiction
Verify the property is within Arroyo Grande city limits and confirm the residential zoning and existing dwelling situation before applying city standards.
Choose your ADU pathway
Decide whether you are planning detached, attached, conversion, JADU, pre-approved stock plan or legalization of an older unpermitted unit. Each pathway changes the evidence you need.
Test the site before paying for detailed design
Record setbacks, easements, structure locations, access, utilities, stormwater conditions and any slope or other property constraint. A stock plan still needs to fit the actual lot.
Prepare the plan and stormwater package
For the pre-approved program, the City specifically calls for the plan-review fee, stormwater documentation and a completed site plan. Custom ADUs require their own complete construction plan set.
Submit through the City’s permit portal
Arroyo Grande uses its Citizenserve portal for building permits. Keep a copy of everything submitted and the date the City confirms completeness.
Resolve plan-check comments, issue the permit and schedule inspections
Approval allows construction to begin; it does not finish the process. Track inspections and corrections until final approval.
Local contacts
Who to contact before you commit money.
Planning questions
Andrew Perez, Planning Manager
aperez@arroyogrande.org
805-473-5425
Useful for zoning, ADU pathway and pre-approved-plan program questions.
Building permits
Aaron Regez
aregez@arroyogrande.org
805-473-5453
Use for building-permit questions and plan-review coordination.
Portal & submittal help
Shayna Sutherland
ssutherland@arroyogrande.org
805-473-5424
The City lists this contact for help with the online portal and submittal process.
Fees & utilities
Do not budget from one generic “Arroyo Grande permit fee.”
Building fees
The City states that building permit fees depend on the size of the unit and scope of work. Use the current City fee schedule and ask for an itemized project estimate rather than copying a number from an old project.
Utility connections
The City’s current handout says an ADU built with a new home requires separate utility connections and standard fees. JADUs and converted ADUs do not require separate City utilities or fees. Other ADUs require separate City utility connections with proportional, actual-cost-based fees; non-City utilities follow their provider rules.
Impact fees
California law limits impact fees for qualifying ADUs, but “impact fee” is not the same thing as every plan-review, building, utility or construction cost. Verify the current HCD rule and Arroyo Grande’s itemized charges for your unit.
Model your project assumptions in our California ADU budget calculator →
Existing unpermitted unit?
Arroyo Grande has a dedicated AB 2533 legalization path.
The City defines this pathway for an ADU or JADU constructed before January 1, 2020 without an approved building permit. Its local process begins by contacting Community Development, completing the City’s AB 2533 checklist, submitting the listed materials through the permit portal, and scheduling the required City final inspection.
Open Arroyo Grande’s AB 2533 instructions →
Before your first City call
Build this Arroyo Grande property file first.
- Property address and parcel number
- Proof the parcel is inside Arroyo Grande city limits
- Residential zoning and existing dwelling type
- Proposed pathway: detached, attached, conversion, JADU, stock plan or legalization
- Target ADU floor area and bedroom count
- Measured side, rear and front-yard conditions
- Existing structure footprints and distances between buildings
- Recorded easements
- Utility locations and likely connection route
- Stormwater and erosion-control requirements to investigate
- Garage or existing space being converted, if any
- Parking situation and whether a state/city exemption may apply
- Any older unpermitted unit or construction
- Questions that remain after reviewing the current City handout
Continue planning
Turn the Arroyo Grande rules into a property-specific plan.
Official sources
Re-check these before paying for design or permits.
- City of Arroyo Grande — Accessory Dwelling Units
- City of Arroyo Grande — Building an ADU: Requirements & Next Steps
- City of Arroyo Grande — Pre-Designed ADU Program
- City of Arroyo Grande — Building Permits & Plan Review
- City of Arroyo Grande — Community Development Contacts
- City of Arroyo Grande — AB 2533 Legalization
- California HCD — October 2025 Arroyo Grande Ordinance Findings
- California HCD — ADU Handbook, updated March 2026
Planning note: ADU Project Planner is an independent educational resource and is not the City of Arroyo Grande, HCD, a design professional or a permitting authority. Local procedures, contacts and fees can change. Verify the current City ordinance, handout and parcel-specific requirements before committing money.