ADU Pass
Leon County
ADU Pass helps homeowners in Leon County, Florida navigate the permit paperwork for building an accessory dwelling unit. We cover 1 city and 10 ZIP codes in this county.
Map
County ADU details
County ADU ordinance
Leon County (Tallahassee, the state capital; home to Florida State University and Florida A&M University; ~300,000 residents) regulates accessory dwelling units in unincorporated areas through the Leon County Land Development Code (LDC), Chapter 10 (Zoning) and the joint City of Tallahassee / Leon County Comprehensive Plan administered by the Tallahassee-Leon County Planning Department. Accessory dwelling units (also called 'guest cottages' or 'garage apartments' in older code provisions) are permitted by right in most rural and large-lot residential districts (Rural, R-1, R-3) subject to lot-area minimums (typically 1+ acres in Rural, 0.5 acre in R-1), maximum unit size (commonly 1,000 sq ft or 50% of principal dwelling, whichever is less), single-occupancy-by-family-members historic restrictions that have been progressively relaxed under Florida F.S. § 163.31771 since 2020, and required owner-occupancy of either the primary or accessory unit. Florida F.S. § 163.31771 (permissive ADU statute) applies; Leon County has affirmatively adopted ADU-enabling provisions in concert with the City of Tallahassee's parallel zoning code. The county and city share a unified planning department, which is unusual in Florida and means ADU rules are coordinated across the urban service area.
County assessor
Assessment policy: Florida uses an elected County Property Appraiser (not 'assessor'). The Leon County Property Appraiser assesses new ADU construction at just value (market value) as of January 1 following completion under Fla. Const. Art. VII § 4 and F.S. Ch. 193. Save Our Homes (Fla. Const. Art. VII § 4(d)) caps the homesteaded primary residence's assessed-value growth at 3% or CPI, whichever is lower; a newly-constructed ADU added to a homesteaded parcel is assessed at market on first roll and thereafter grows under the same 3%/CPI cap if it shares the homestead. Non-homestead accessory dwellings (rented separately, used as Airbnb/short-term rental, etc.) are subject to the 10% assessment-growth cap under Amendment 1 (2008) and may lose homestead protection on the proportional share if rented commercially.
County overlays (4)
Known county issues (4)
- other — ADU policy changes adopted by either the Tallahassee City Commission or the Leon County Board of County Commissioners may affect the other jurisdiction; the joint planning agenda and joint workshops are the canonical source for upcoming changes.
- other — ADU projects on rural southern Leon County parcels may face $8,000-$20,000 of additional septic cost beyond a conventional drainfield, plus annual operating-permit fees of $150-$300 for ATU systems. This shifts ADU economics meaningfully and should be checked parcel-by-parcel against the BMAP boundary.
- other — Canopy Road parcels often need ADU siting at the rear of the property with extended driveways, increasing site-development cost and potentially requiring Environmental Permit review. Some highly-constrained parcels cannot accommodate a detached ADU within zoning setbacks while staying outside the CRPZ.
- other — Realistic ADU rental scenarios in unincorporated Leon County target workforce or tourism markets, not student rentals. Operators with Airbnb-style strategies should check the Wakulla Springs BMAP overlay and any HOA restrictions before assuming short-term rental viability.
Florida state — ADU law and programs
State ADU law
Florida does NOT currently have a statewide ADU preemption law in effect. Florida Statutes § 163.31771 (enacted 2004, last amended 2020) is permissive — it authorizes local governments to adopt ADU ordinances but does not require them to. ADU rules are therefore set municipality-by-municipality: Miami-Dade, Orlando, St. Petersburg, Tampa, and a growing set of Florida cities have their own ordinances; many smaller counties and cities still prohibit or restrict ADUs by default. A preemption bill (SB 48 / HB 313) is pending in the 2026 legislative session and is likely to pass given that its 2025 predecessor cleared the Senate 37-0 and House 97-10 before dying on a procedural amendment dispute.
- Florida Statutes § 163.31771 — Accessory dwelling units — Permissive (not mandatory) statute. Defines an ADU as 'an ancillary or secondary living unit, that has a separate kitchen, bathroom, and sleeping area, existing either within the same structure, or on the same lot, as the primary dwelling unit.' Authorizes — but does not require — local governments to adopt ordinances allowing ADUs in single-family residential zones. Contains no size caps, no owner-occupancy rules, no HOA preemption. All substantive rulemaking is local.
State financing programs
Florida Housing Finance Corporation (FHFC) does not operate an ADU-specific state loan or grant program. FHFC's primary affordable-housing lever at the ADU tier is the State Housing Initiatives Partnership (SHIP), which distributes state documentary-stamp-tax revenue to all 67 counties and 52 entitlement cities for locally-administered housing programs — some of which may fund ADU construction at the local level (notably Orange County's Affordable ADU Loan Program, run through the Orange County Housing Finance Trust). FHFC's FL Assist down-payment programs and HFA Preferred / HFA Advantage conventional loans apply to ADU-eligible primary residences but do not single out ADUs. Proposed CS/SB 1440 would create a state property-tax exemption of up to 100% of assessed value for an ADU rented at affordable rates.
State housing programs
Florida does not currently operate a statewide pre-approved ADU plan catalog (unlike California or Washington). State-level ADU implementation is driven by (a) the permissive § 163.31771 which lets willing jurisdictions adopt ordinances, (b) SHIP pass-through funding to local ADU programs (Orange County's Affordable ADU Loan Program is the model), and (c) the affordable-housing property-tax exemption under the Live Local Act (SB 102 / SB 328). The Department of Economic Opportunity (DEO) — now reorganized as the Department of Commerce — provides technical assistance to local governments but no statewide ADU-specific mandate or program. Major counties (Miami-Dade, Orange, Pasco, Hillsborough, Pinellas, Broward) have published their own ADU ordinances and guidance documents.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.