JACKSONVILLE · ADU BUILDER · 2026

ADUs in Jacksonville — rules, costs, and what to expect.

Jacksonville is Florida's largest city by area and one of the most under-built ADU markets in the state. The Duval County zoning code permits ADUs in many residential districts, and the consolidated city-county government simplifies permitting compared to a separate city/county split.

MAX ADU SIZE
750 sq ft
Tooly is 264
TYPICAL RENT
$1,150–$1,400
long-term, furnished
PERMIT TIMELINE
5–9 weeks
City of Jacksonville
JACKSONVILLE RULES

What Duval County allows.

The City of Jacksonville (consolidated with Duval County) permits ADUs in many residential zoning districts under its Planning and Development framework. Key parameters:

Beach municipalities (Atlantic Beach, Neptune Beach, Jacksonville Beach) have their own zoning codes separate from Jacksonville proper. Check the relevant city if your address is on the beaches.
THE NUMBERS

What a Tooly costs in Jacksonville, all-in.

Tooly unit (delivered, furnished, finished)$85,000
Jacksonville building permit + impact fees$2,200 – $4,800
Foundation + site prep$8,000 – $16,000
Utility tie-ins$4,500 – $11,000
Total installed cost$99,700 – $116,800

Jacksonville rental economics

Furnished 1-bedroom rents in Jacksonville's core neighborhoods (Riverside, Avondale, Springfield, San Marco) sit at $1,150–$1,400/month. The beach communities and Mandarin push toward $1,500–$1,800. Lower entry rent than Miami or Tampa, offset by lower all-in cost.

PERMIT PROCESS

How to get an ADU permit in Jacksonville.

  1. Zoning verification — confirm ADU eligibility via the Jacksonville zoning portal.
  2. Building permit application — Tooly provides the architectural and structural package.
  3. Plan review — typically 3–5 weeks.
  4. Permit issuance — construction begins.
  5. Inspections + CO — standard FBC inspections.

Realistic timeline from contract to move-in: 12–17 weeks. Jacksonville moves notably faster than the South Florida cities on permits.

Jacksonville is an undervalued ADU market.

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