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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsTo find out whether a property allows an accessory dwelling unit (ADU), identify the parcel’s governing city or county, look up its zoning and overlays in the official property map, read that jurisdiction’s ADU rules, and confirm your specific proposal with the planning or building department. A residential zoning label alone is not a yes-or-no answer: lot dimensions, setbacks, floor-area limits, parking, hazards, utilities, existing permits, historic rules, and private restrictions can change the result.
No general national lookup can determine eligibility for an unspecified property. The dependable answer is a parcel-specific determination or permit review from the authority that regulates the lot.
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The reliable test is parcel-specific
An ADU may be a detached backyard cottage, an attached addition, a garage conversion, or a finished basement or attic. Those forms can be treated differently even on the same lot. The first question is therefore not “Is this a residential property?” but “Which government regulates this parcel, and what rules apply to this ADU form at this address?”
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Use online maps and ordinances to screen the idea, then ask the local department to review the actual concept. A map result is useful evidence, but it is not a building permit or a promise that plans will be approved.
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1. Establish the parcel and the correct jurisdiction
Collect the address and parcel identifier
Start with the exact street address. Obtain the assessor’s parcel number (APN), tax lot number, or equivalent identifier if one is available. Addresses can be formatted differently in government systems, and a parcel number helps staff distinguish adjoining lots with similar addresses.
Record the lot area, existing buildings, and the map’s zoning designation. Save a copy or screenshot of the result and note the date, because map layers and codes can change. If the property is being purchased, use the legal parcel shown by the public agency rather than relying only on a real-estate listing description.
Confirm city limits versus an unincorporated area
Determine whether the lot is inside an incorporated city or in an unincorporated county area. The agency that controls zoning and permits may be different in each case. A city’s ADU page may not apply to a property just outside its boundary, even when the mailing address uses the city name.
The City of Orlando’s official guidance makes this a separate first check: its Information Locator is used to confirm that an address is within the city and to identify its zoning categories. If the parcel is outside the city, find the county or other agency that actually administers land-use and building permits.
Use the official parcel or zoning map
Search the planning department’s GIS, zoning map, or property-information locator. Write down:
- the regulating jurisdiction;
- the parcel or APN number;
- the zoning district;
- the lot area and, where shown, lot dimensions;
- overlay districts, historic or landmark designations, and planned-development references;
- mapped flood, slope, landslide, or other hazard information; and
- any notes about easements or development conditions.
Do not stop after seeing a district that appears residential. Zoning establishes the starting framework; the ADU ordinance and parcel-specific standards decide whether the proposed unit can fit.
2. Find the ADU rules that apply to that parcel
Read the ordinance, not just the map label
From the jurisdiction’s ADU page, follow the links to the zoning code and application guidance. Find the provisions for the exact type of project you are considering: detached construction, an attached addition, a garage conversion, a basement or attic conversion, or a junior/accessory unit where that category exists.
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Make a written list of every standard the code mentions. Typical subjects identified in local guidance include lot area, number of units, maximum ADU size, setbacks, height, lot coverage or floor-area ratio (FAR), placement, parking, design, occupancy, and rental or short-term-rental rules. The list is a screening tool; the wording and thresholds must come from the code for your jurisdiction.
Check for more than one legal pathway
Some jurisdictions present a local ADU ordinance alongside a state-law pathway. Sacramento, for example, explains that applicants may need to compare local standards with state ADU standards, which can have different requirements. Determine which pathway is available to your parcel and whether the choice affects size, setbacks, parking, review, or other conditions.
Do not carry one city’s thresholds into another city. Orlando’s guide identifies zoning categories that may be eligible but also says that lot size, FAR, and additional planning standards still control. Its screening information is an example of a local process, not a nationwide rule.
3. Match the proposed ADU form to the rules
Sketch the project before asking for a definitive answer. Include the approximate location, floor area, height, entrances, and relationship to the primary dwelling. Then test the concept against the relevant code sections.
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|---|---|---|
| Detached new unit | Can a second structure occupy the buildable area after setbacks, height, lot-coverage or FAR limits, access, and utility routes are applied? | Zoning review, building permit, trade permits, and any design, historic, hazard, or utility review required by the jurisdiction. |
| Attached addition | Does the addition satisfy setbacks, height, lot coverage or FAR, placement, fire and building requirements, and the rules for its connection to the primary dwelling? | Zoning and building review, with trade permits and possible design or historic review. |
| Garage, basement, attic, or other conversion | Is the existing space legally permitted, and can it meet living-space, egress, ceiling-height, insulation, ventilation, fire, and utility requirements? | Permit-history verification followed by building and trade permits for the conversion. |
| Junior or other accessory unit category | Does the local code recognize this category, and does an applicable state-law pathway impose different standards? | The local ADU or accessory-unit review identified by the planning department, plus permits required for the work. |
The form can change the answer. A lot that cannot fit a detached structure may still support a compliant conversion, while a conversion can fail because the existing room lacks legal permits or required egress.
4. Test the buildable envelope and use restrictions
Measure the physical envelope
Use the parcel dimensions and existing-site information to sketch setbacks from property lines, the primary dwelling, streets, and other structures as required by the local code. Account for maximum height, lot coverage, FAR, and the location of driveways or required access. An ADU that fits by floor area can still fail because its footprint, height, or separation from another building is not allowed.
Check unit count, size, parking, and design
Confirm how many dwelling units the zoning district permits, the maximum ADU floor area, and whether parking is required or modified for a particular project. Read design provisions for windows, entrances, exterior materials, roof form, or visibility where the code includes them. Check occupancy, owner-occupancy, rental, and short-term-rental rules separately; permission to build does not automatically establish permission for every use.
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Account for planned-development conditions
A planned development, subdivision condition, or other site-specific approval can add standards beyond the base zoning district. Locate the recorded development documents or ask planning staff whether such conditions apply to the parcel before relying on the ordinary district rules.
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Historic and design controls
Look for historic districts, individually designated landmarks, conservation areas, and design-review overlays. These may affect demolition, exterior changes, building placement, materials, or visibility from a public way. A project can be allowed as an ADU in the base zoning while still needing a separate historic or design review.
Easements and access
Review the recorded deed, title materials, and the map for utility, drainage, access, or other easements. An easement may occupy the portion of the lot where the ADU, foundation, driveway, or utility trench would otherwise go. Ask the relevant agency or a qualified title professional how the easement affects construction; do not assume that an unmarked area is available to build on.
Flood, slope, and other hazard overlays
Check official hazard maps and the local development rules. Flood, steep-slope, landslide, and similar conditions can change the allowable location, foundation design, drainage requirements, or review process. Portland’s ADU guidance notes that a location on a slope of 20% or more or in a landslide area may require a soils or geotechnical report under its local guidance. That threshold is a Portland example, not a standard for every jurisdiction.
HOA covenants and deed restrictions
Read the recorded covenants, conditions, and restrictions (CC&Rs), subdivision declarations, and other private documents. Whether an HOA can restrict an ADU depends on the property’s state law, the document’s language, and the type of restriction. Treat a blanket statement that an HOA always can or always cannot block an ADU as unreliable until those sources are checked.
California is a specific example. The California Department of Housing and Community Development’s March 2026 Accessory Dwelling Unit Handbook explains that certain CC&R provisions prohibiting or unreasonably restricting ADUs or junior ADUs on qualifying single-family-zoned lots are void under cited California statutes. It also notes that HOAs may still impose limited objective standards. Those rules should not be generalized to properties in other states.
6. Verify permits for existing structures
If the project uses a garage, basement, attic, or addition, ask the building department for the permit history and any available approved plans. Confirm whether the space was legally constructed and whether prior alterations were inspected. County assessor or tax records can show that a structure exists, but they do not prove that the work was permitted or that the space is legal dwelling area.
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The City of Portland states the point plainly: “You should verify work with actual permits, and not rely on tax information from the county.” Portland also says that new or converted ADUs require building permits. Other jurisdictions may use different permit names, but the underlying check is the same: verify the legal record before designing around an existing room.
For a conversion, ask staff which building-code provisions apply to living space. Screen for emergency escape and rescue openings or other egress, ceiling height, insulation, ventilation, fire separation, sanitation, stairs, electrical capacity, plumbing, and heating. The exact requirements depend on the adopted building code and the project’s scope, so obtain the department’s checklist rather than assuming that a finished room is already habitable.
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Water, wastewater, power, and access
Identify how the ADU would connect to water, sewer or septic, electricity, stormwater systems, and fire or emergency access. Ask whether the existing services have capacity and whether a separate meter, service upgrade, connection approval, or utility charge is required. Rural parcels may face septic or well constraints that do not appear on a city zoning map.
Physical dimensions and construction access
Measure the route for construction equipment, the location of mature trees or retaining walls, and the space needed for foundations, drainage, and utility trenches. A permitted building envelope can still be impractical if the site cannot accommodate required access, grading, or service connections.
Hazard and geotechnical review
Use the jurisdiction’s hazard maps and ask whether the site requires a survey, drainage study, soils report, geotechnical report, flood review, or other technical document. Portland identifies flood, slope, and landslide areas as part of its pre-build research. The agency may require additional studies even when the zoning district allows an ADU in principle.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.8. Ask the planning or building department about the actual proposal
Once you have the parcel information and a basic sketch, send a concise, parcel-specific inquiry. Include:
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- street address and APN or parcel number;
- jurisdiction and current zoning designation;
- description of the existing primary dwelling and any structure to be converted;
- proposed form: detached, attached, conversion, or junior/accessory unit;
- approximate floor area, height, footprint, setbacks, and location;
- known historic, planned-development, flood, slope, landslide, easement, or HOA conditions; and
- questions about the applicable code pathway, required permits, reviews, fees, and technical studies.
Ask whether the department offers a written zoning determination, pre-application conference, or other formal feasibility review. Request the code sections and application checklists that staff used. A written response or pre-application record is more reliable than an informal calculator or a general webpage because it addresses the parcel and concept together.
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When the project proceeds, confirm every required approval. Portland’s guidance describes building and trade permits for ADU work; another jurisdiction may also require planning, historic, design, utility, septic, or grading approvals. Final authorization comes through the required application and permit review, not through a preliminary map search.
A practical inquiry template
Subject: ADU eligibility question for [address] / [parcel number]
I am evaluating a [detached / attached / conversion] accessory dwelling unit at [address]. The parcel is identified as [APN or parcel number] and appears to be zoned [designation]. The proposed unit would be approximately [floor area] square feet, [height] high, and located [brief location or conversion description].
Please confirm:
1. Which ADU ordinance or state-law pathway applies;
2. Whether this parcel may qualify for the proposed form;
3. The applicable setbacks, height, lot-coverage or FAR, parking, access, and design standards;
4. Whether historic, planned-development, hazard, easement, utility, or HOA issues require additional review;
5. Which building, trade, planning, and other permits are required; and
6. Whether a written determination or pre-application review is available.How to compare two feasible ADU approaches
If staff indicates that more than one form or rule pathway may work, compare the options before paying for full plans. Use the same parcel facts for each option.
| Decision axis | What to compare |
|---|---|
| Form | Detached new unit, attached addition, garage conversion, basement or attic conversion, or another recognized accessory-unit category. |
| Governing standard | The local ADU ordinance versus any applicable state-law pathway, including differences in objective requirements. |
| Buildable envelope | Setbacks, height, access, lot coverage or FAR, separation from existing structures, and the location of easements. |
| Infrastructure and hazards | Water, wastewater or septic, power, drainage, utility capacity, flood or slope conditions, and any required technical reports. |
| Approvals and fees | Building and trade permits, planning or design review, historic review, utility approvals, and local charges identified by the agency. |
| Use restrictions | Occupancy, rental or short-term-rental rules, deed restrictions, and HOA provisions as modified by applicable state law. |
This comparison often reveals why a smaller conversion or attached unit is more practical than a detached design, or why an apparently simple conversion needs more documentation than new construction.
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What official local guidance illustrates
Orlando: jurisdiction and zoning are separate checks
Orlando’s “Accessory Dwelling Units: Step-by-Step Guide” directs users to verify that the address is inside city limits and to identify its zoning categories in the city’s Information Locator. It then cautions that possible eligibility also depends on minimum lot size, FAR, and additional planning standards. The lesson is procedural: a favorable map label is only the first screen.
Sacramento: local and state standards may differ
Sacramento’s “Step 1: Is an ADU Allowed on My Property?” presents local standards alongside state standards. A property owner must determine which set applies and then test the parcel against the relevant requirements. The example shows why copying a rule from a neighboring city or a statewide summary can produce the wrong answer.
Portland: permits and site conditions matter
Portland’s ADU guidance combines zoning, permit history, utilities, hazards, and building permits in its pre-build process. It specifically advises verifying work through actual permits rather than county tax information and identifies flood, slope, landslide, utility, and geotechnical issues that can affect feasibility.
California: private restrictions require state-specific analysis
The California Department of Housing and Community Development handbook, issued in March 2026, explains California’s treatment of certain ADU and junior-ADU restrictions in CC&Rs and the limited objective standards an HOA may still impose. That discussion is useful only for a property governed by California law; it is not a national HOA rule.
Common mistakes and how to correct them
- Using the wrong agency: A city webpage may not govern an unincorporated parcel. Confirm the boundary and the actual permitting authority first.
- Treating residential zoning as approval: Read the ADU ordinance and test lot area, setbacks, height, FAR or lot coverage, parking, design, and use rules.
- Relying on a map alone: Map layers are screening information. Request parcel-specific confirmation and complete permit review.
- Assuming a finished room is legal: Obtain permit records and check egress, ceiling height, insulation, ventilation, fire, plumbing, and electrical requirements.
- Ignoring overlays and easements: Historic, planned-development, hazard, drainage, access, and utility constraints can remove the apparent building area.
- Applying another state’s rule: State-law limits on local restrictions, including California’s CC&R provisions, are jurisdiction-specific.
- Designing before screening utilities: Confirm water, wastewater or septic, power, access, drainage, and capacity before commissioning detailed plans.
- Trusting an unverified calculator: Use official maps and code sections, then ask planning or building staff to review the actual proposal.
Final parcel-screening checklist
- Get the exact address and APN or equivalent parcel number.
- Confirm whether the property is inside a city or in an unincorporated area.
- Record the official zoning designation, lot area, dimensions, overlays, and mapped hazards.
- Find the jurisdiction’s ADU ordinance and identify the rules for the proposed form.
- Compare local and state-law pathways if both are offered.
- Measure the concept against setbacks, height, lot coverage or FAR, size, parking, access, design, and use rules.
- Check historic, planned-development, flood, slope, landslide, easement, and utility constraints.
- For a conversion, obtain actual permit records and verify building-code requirements.
- Read CC&Rs and other private restrictions, then apply the law of the property’s state.
- Send the parcel facts and sketch to planning or building staff and ask for the required reviews and permits.
- Do not commit to construction until the jurisdiction confirms the applicable pathway and the project passes its formal review.
What counts as a dependable answer
You have a defensible answer when the correct authority has been identified, the parcel’s zoning and overlays have been checked, the proposed ADU fits the applicable objective standards, existing structures and hazards have been verified, and planning or building staff have identified the required approvals. Until those checks are complete, “ADUs are allowed in this neighborhood” is only a general indication—not proof that this property can receive a permit.
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