01 · Consultation and code check
Does an ADU fit your lot?
We walk your property, pull your city or county's ADU ordinance, and tell you plainly whether a unit fits before anyone draws a line.
Book a site walkFree download
The Florida ADU Guide.
Everything a Florida homeowner needs to weigh an ADU: the rules where you live, real build costs, realistic rental income, and how we run the project from the first site walk to the keys.
- ADU rules today, set by your city or county, and what to check before anyone draws a line
- Realistic build-cost and rental-income ranges at 2026 rates
- The step-by-step Spire build process
- Straight answers to the questions owners actually ask
2026 session updateThe guide now carries a September 2026 update page: SB 48 passed the Senate and did not become law. The rules that apply are your city or county's.
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What is inside
The rules, the numbers, and the process.
Four things every owner asks us on the first call, answered plainly and put in writing.
The rules where you live
ADU rules are set by your city or county, not the state. The guide shows you what to look up in your local ordinance before you spend a dollar on drawings.
Real build costs
Most detached ADUs in South Florida land between $210,000 and $310,000 all-in for about 600 SF. We price yours to the dollar before you commit.
Realistic rental income
An estimated $15,000 to $30,000 a year in gross rent at 2026 one-bedroom market rates, before vacancy, taxes, insurance and maintenance, and subject to your city's rental rules.
The Spire build process
Site walk, local code check, design, one fixed-scope number, permit, build with a photo every day, and a walkthrough with one of the owners.
Where the law stands
Your city writes the rules.
ADU rules are set by your city or county, not the state. Florida's proposed statewide ADU bill (SB 48) passed the Senate but did not become law in 2026. We check your local ordinance before we draw anything. If a statewide bill returns in 2027, we will update this guide.
- Size limits, setbacks and height come from your local ordinance
- Some cities set a 30-day minimum on rentals, and some limit who may rent an ADU
- Owner-occupancy and parking rules are local too, and they differ city to city
- We run the permit and inspection path start to finish
How we run it
From your lot to the keys.
Three steps, one number, and an owner on your site the whole way.
02 · Design, price, permit
One number, in writing
Plans sized to your ordinance, a fixed-scope price with open books, and we run the permit and inspection path so you do not have to.
How we price03 · Build and handover
A photo every day
Hurricane-rated construction with daily logs and progress photos. Changes are priced and signed before the work happens. One of the owners walks the finished unit with you.
What we buildStraight answers
The ADU questions owners actually ask.
Does Florida allow ADUs statewide?
No. ADU rules are set by your city or county, not the state. Florida's proposed statewide ADU bill (SB 48) passed the Senate but did not become law in 2026. We check your local ordinance before we draw anything.
What does a detached ADU cost?
Most detached ADUs in South Florida land between $210,000 and $310,000 all-in for about 600 SF. Impact fees vary by county and are part of the number we give you. We price yours to the dollar before you commit.
How much rent can an ADU bring in?
An estimated $15,000 to $30,000 a year in gross rent at 2026 one-bedroom market rates, before vacancy, taxes, insurance and maintenance, and subject to your city's rental rules.
Can I rent it short-term?
Some Florida cities set a 30-day minimum on rentals, and some limit who may rent an ADU. We check your city's rules before design, so you know before you commit.
Who runs my project day to day?
One of the owners. Bill or Gary is on your site and on your phone from the first estimate to the final walkthrough.
Is the guide really free?
Yes. Leave your name and email above and the PDF opens right away. If you would rather talk it through, call (844) SPIRE-GC.
Ready to build?
Turn your backyard into income.
Free consultation, no obligation. You will talk to someone who has built what you are planning.
Book a Free Consultation or call (844) SPIRE-GC