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Palm Beach County, FL Accessory Structures: ADU Rules (2026)

Heavy Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified April 2026

ADU rules in Palm Beach County, FL, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Lot Min: 1 acre
Size Limit: 800 sq ft habitable
Separate Rent: Prohibited
Wind Load: 170 mph coastal (HVHZ-style)
Authority: PBC ULDC Art. 4.B.1.A

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Florida under recent ADU streamlining laws. The Palm Beach County, FL rules below cover local size, height, and setback requirements.

Summary

Unincorporated Palm Beach County allows accessory dwelling units (called Guest Cottages or Servant Quarters) under PBC ULDC Article 4.B.1.A on lots of at least one acre in agricultural and most residential zoning districts. Units are limited to 800 square feet and may not be rented separately.

City-specific rules exist: Boynton Beach, Jupiter, and West Palm Beach have their own adu rules rules that differ from Palm Beach County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

requiring, rather than authorizing, local governments to adopt, by a specified date, an ordinance to allow accessory dwelling units in certain areas; authorizing a local government to provide a density bonus incentive to landowners who make certain real property donations to assist in the provision of affordable housing for military families; requiring the Office of Program Policy Analysis and Government Accountability to evaluate the efficacy of using mezzanine finance and the potential of tiny homes for specified purposes, etc.

Source: PBC ULDCView official code

Full Breakdown

PBC ULDC Article 4 defines a Guest Cottage as a detached residential unit accessory to a single-family principal dwelling, limited to 800 square feet of habitable area, requiring a minimum one-acre lot in AGR, AR, RE, RT, RR, and RS zoning. The unit must share utility connections with the principal dwelling and may not be sold or rented as a separate dwelling. Servant Quarters serve a similar purpose but may include kitchen facilities only with conditional approval. Setbacks follow the underlying district. Building permits must comply with FL Building Code 8th Edition (2023) including HVHZ wind load standards (Palm Beach County requires Risk Category II structures designed to withstand 170 mph winds in coastal zones). The Live Local Act (SB 102, 2023) does not override PBC ADU restrictions for unincorporated parcels. Septic and well capacity must be verified by PBC Health Department for non-sewered properties.

Violations & Fines

Unpermitted ADU construction: stop-work order, permit-after-the-fact at 4x fee, possible removal. Renting an ADU separately: zoning violation, Special Magistrate fines to 500 dollars per day.

Frequently Asked Questions

Can I build an ADU on my quarter-acre lot?

No. PBC requires a minimum one-acre parcel for a Guest Cottage in residential zoning.

Can I rent the guest cottage on Airbnb?

No. Guest Cottages may not be rented separately from the principal dwelling under ULDC Art. 4.

Sources & Official References

[1]PBC ULDC
[2]PBC Building Division

Other rules in Palm Beach County

Shed & Carport RulesSome Restrictions Tiny HomesSome Restrictions Garage ConversionsSome Restrictions ADU Owner OccupancySome Restrictions Parking Rules: Loading ZonesSome Restrictions Parking Rules: Curb Color RulesSome Restrictions Animal Ordinances: Pet Groomer RulesSome Restrictions Animal Ordinances: Veterinary Clinic ZoningSome Restrictions Animal Ordinances: Cat RulesSome Restrictions Animal Ordinances: MicrochippingSome Restrictions

All Palm Beach County rules

How Palm Beach County compares: Easiest Cities to Build an ADU·Florida rules heatmap·Compare Palm Beach County to another location·View the Florida accessory structures overview

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ADU Rules in Cities Across Palm Beach County

West Palm Beach, FL Boca Raton, FL Boynton Beach, FL Delray Beach, FL Jupiter, FL