Tallahassee imposes impact fees on residential construction including ADUs through the Concurrency Management System and Mobility Fee program, which replaced the prior transportation impact fee. Florida Statute 163.31801 governs municipal impact fees, and Florida HB 337 (2021) capped annual increases. Leon County School Impact Fees apply separately. Water and sewer system development charges are billed by the City of Tallahassee Utilities.
Tallahassee replaced its earlier transportation impact fee with a Multimodal Transportation Mobility Fee under Tallahassee-Leon County Concurrency Management. ADU charges include: (1) Mobility Fee based on land-use category and trip generation β ADUs are typically charged at a reduced trip-generation rate compared to a single-family detached home given their smaller size; (2) Stormwater system development charge under the Stormwater Management Ordinance; (3) City of Tallahassee Utilities water and sewer system development (capacity) charges, which can be reduced or waived where the ADU shares an existing service connection with the principal dwelling; (4) Leon County School Impact Fee, collected by the County under interlocal agreement; (5) parks impact fees where applicable. Florida Statute Β§ 163.31801 sets the constitutional and procedural framework for impact fees, requiring rational nexus and rough proportionality. Florida HB 337 (2021) amended the statute to cap impact-fee increases at 50% over four years or 25% over two years, with phased adoption required for higher increases β and the legislature has added further procedural safeguards in subsequent sessions. Local governments must justify any increase with an infrastructure-deficiency study. Property reassessment is performed by the Leon County Property Appraiser after construction, increasing annual ad valorem taxes; the homestead exemption applies only to the principal dwelling.
Failure to pay impact fees and system development charges blocks issuance of building permits and certificates of occupancy. Unauthorized water or sewer connections result in service disconnection by City Utilities and penalty billing. Unpermitted construction discovered later faces doubled fees and after-the-fact permit fees, plus Code Enforcement Board fines up to $250/$500 per day under Fla. Stat. Β§ 162.09. Florida courts have held challenges to impact-fee calculations require timely administrative review.
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See how Tallahassee's adu impact fees rules stack up against other locations.
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