The Florida ADU Starter Kit: Essential Checklists Before You Break Ground

The momentum behind backyard housing in Central Florida has never been stronger. Whether you are tapping into long-term rental income or designing a multi-generational family compound, building an Accessory Dwelling Unit (ADU) is a profound way to maximize your real estate asset.

Moving from a conceptual dream to an active, permitted construction site requires strict operational planning. At Prefabricated.co, the most critical phases happen long before a shovel touches dirt.

These are the verification milestones to run through before you sign with a builder or purchase a modular unit. Download the full interactive Florida ADU Starter Kit for budget sheets, planning workbooks, and builder questionnaires.

Checklist 1: The Local Municipal Verification

Your project is bound by local building and zoning rules. Never assume a general contractor knows your parcel restrictions.

• Jurisdiction check: Confirm via the county property appraiser whether you are under City of Orlando by-right rules or unincorporated Orange County guidelines (Special Exception via the BZA).
• The setback map: What are your exact rear, side, and front setbacks? Do you have a certified boundary survey showing these lines?
• Lot coverage limits: Does your municipality cap impervious surface percentage (concrete, roofs, driveways)? Will the ADU push you over the threshold?
• HOA clearance: If you are in an HOA, have you reviewed CC&Rs and submitted an architectural review application?

Checklist 2: Site Infrastructure and Utility Auditing

Connecting utilities to a secondary structure is where hidden costs lurk—model them in your ADU budget worksheet before you commit.

• Main electrical capacity: Is your primary panel rated for at least 200 amps? If it is 100 amps, have you budgeted a main service upgrade with your utility provider?
• Septic/sewer evaluation: On city sewer, is the secondary lateral tie-in lower than the ADU foundation for gravity flow? On septic, has the health department signed off on capacity for an additional dwelling?
• Equipment access: Is there a clear path at least 10 feet wide for excavators and trenchers? For modular delivery, are overhead power lines or heritage oaks blocking a crane?

Checklist 3: The 4 Critical Questions for Your Builder

When interviewing contractors or modular manufacturers, look for professionals who understand Central Florida's biome. Never sign without asking:

1. "Is this structure engineered to meet current Florida Building Code wind-load requirements?"

Your ADU must withstand severe hurricane-force winds (typically 130–150 mph depending on coastal distance). Demand site-specific structural plans detailing hurricane straps, ties, and anchor bolts.

2. "What specific insulation envelope package are you deploying?"

Standard fiberglass batts invite high energy bills and mold in humid climates. Demand closed-cell spray foam or continuous rigid exterior insulation—as outlined in staged resilience.

3. "Are windows and glass doors impact-rated with Low-E coatings?"

Double-pane hurricane impact glass with Low-E coating reflects solar heat while meeting Florida Building Code glazing requirements.

4. "How are local building inspections managed?"

For factory-built modular units, verify a Florida DBPR approval stamp so the structure is pre-inspected at the factory—local inspectors focus on site prep, foundation, and utility hookups, shortening your timeline. Follow the full 7-step legal build path for sequencing.

Moving Forward with Absolute Certainty

Checking these line items insulates your investment from unexpected liabilities, keeps your timeline on track, and builds an asset that delivers maximum equity for decades.

Next in Pillar 5: [10 showcase crops for small-footprint Florida sites](/blog/resilient-roots-showcase-crops-florida).