What's the total ADU permit fee in Miami?

Total Miami ADU permit fees in 2026 run roughly $7,500–$18,500 depending on size, type, and any utility hookups required.

How long does Miami ADU permit review take?

Standard Miami ADU plan review takes 6–16 weeks. Pre-approved plans and complete submittals can shorten that significantly.

What fees are NOT included in the base Miami permit cost?

Utility connection fees (water, sewer, electric), school impact fees, drainage and fire-line upgrades, and any private-engineering studies typically add 30–60% to the base permit number.

Can I get my Miami ADU permit fees reduced or waived?

Some jurisdictions offer fee reductions for deed-restricted affordable ADUs, JADUs under 500 sq ft, or projects using pre-approved plans. Check Miami's current ADU ordinance for available waivers.

ADUCosts

Miami, FL

Miami ADU Permit Fee Calculator (2026)

Name: aduglossary.com — Miami FL ADU Resources
Price range: $

Instant fee breakdown for Miami, Florida. Total range: $7,500–$18,500.

Miami, Florida ADU Permit Fees

Total estimated range: $7,500–$18,500

Plan Check

$800–$2,000

Building Permit

$1,200–$3,500

Impact Fees

$3,000–$12,000

School Fees

N/A

Utility Hookups

$2,500–$6,000

Source: City permitting schedules and FeeBuilder surveys, updated April 2026.

Miami permit process at a glance

Permitting office: Miami Building Department

Typical plan review: 14-24 weeks

Fee waivers: No statewide ADU impact-fee waiver in Florida; Miami applies full mobility, fire, and parks fees.

Miami's ADU rules (Miami 21 Code T3-R, T3-O, T3-L) require attached or interior conversion for most accessory units rather than detached backyard cottages. The dominant cost factors are the Florida Building Code wind-uplift requirements (Miami-Dade is in the High-Velocity Hurricane Zone — wind-design speed 175 mph) and the flood-plain elevation requirements covering much of the city east of US-1. Wind-rated windows, doors, and roof straps drive materials 25-40% higher than mainland Florida cities.

Sample real-world fee example

Scenario: 750 sq ft attached ADU on 5,500 sq ft lot in Coconut Grove

Plan check	$1,400
Building permit	$2,200
Mobility fee	$2,800
Fire impact fee	$650
Sewer + water tap	$3,800
TOTAL	$10,850

Common Miami ADU permit mistakes

Underestimating Florida Building Code High-Velocity Hurricane Zone wind-rated window/door cost (25-40% materials premium).
Missing flood elevation requirements for lots east of US-1.
Not budgeting for Miami's separate mobility-fee impact charge (not waived for ADUs).
Overlooking T3 zoning context — Miami 21 limits detached ADUs in many residential zones.

How Miami compares nearby

City	Total fee range	Link
Miami	$7,500–$18,500	(this page)
Austin	$6,600–$14,500	View →
Los Angeles	$6,500–$16,500	View →

Full Miami cost guide ROI calculator Compare all 18 cities

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