Why the ADU Process Is More Involved Than a Standard Addition
Building an ADU creates an independent dwelling unit — which triggers additional zoning approvals, utility considerations, and inspections that a simple room addition does not require.
Total timeline: typically 5–9 months in Orlando. The permit phase alone accounts for 8–14 weeks.
Step 1: Zoning Verification & Site Eligibility
Confirm Your Lot Qualifies
We verify zoning district, minimum lot size, required setbacks, maximum ADU size allowed, and owner-occupancy rules. This step is free and prevents wasted design fees on a non-qualifying lot.
Step 2: Design & Engineering
Architectural Plans & Structural Engineering
R&S develops architectural drawings showing floor plan, elevations, site plan with setbacks, and structural details. A licensed engineer certifies the foundation and framing design. Timeline: 2–4 weeks.
Step 3: Permit Application & City Review
Submitting to the City or County
We submit the complete permit package to the City of Orlando or Orange County. Plan review for ADUs typically takes 6–12 weeks. R&S handles all comments and resubmittals immediately.
Step 4: Site Preparation & Foundation
Clearing, Grading & Concrete Slab
Site prep, grading for Florida drainage, and monolithic concrete slab foundation. Foundation inspection must pass before framing begins.
Step 5: Framing & Roofing
Structure, Roof & Weather-Proofing
Wall framing, roof trusses, sheathing, roofing, windows, and exterior doors. Florida requires hurricane strapping and impact-resistant materials by code.
Step 6: Mechanical Rough-In
Electrical, Plumbing & HVAC
All rough mechanical work before walls are closed. Each trade requires its own city inspection. Utility connections established — separate metering recommended for rental ADUs.
Step 7: Interior Finish
Insulation, Drywall, Flooring & Fixtures
Insulation, drywall, flooring, kitchen, bathroom, trim, and paint. Finish quality directly affects rental rate.
Step 8: Final Inspections & Certificate of Occupancy
City Inspection & Legal Occupancy
Final inspection covers all systems. Once passed, the city issues a Certificate of Occupancy — legally certifying the ADU as a habitable dwelling. R&S does not close a project until the CO is in hand.
Full Timeline Summary
| Phase | Duration |
|---|---|
| Zoning verification | 1–2 weeks |
| Design & engineering | 3–5 weeks |
| Permit review | 6–12 weeks |
| Foundation & framing | 5–8 weeks |
| Mechanical & finish | 5–8 weeks |
| Final inspection & CO | 1–2 weeks |
| Total | 5–9 months |
ADU Projects: Real Examples in Orlando, FL
Browse real ADU and guest house projects — from farmhouse-style cottages to tropical backyard studios and craftsman detached suites. R&S General Construction builds fully permitted ADUs in Orlando and surrounding areas.
Interested in adding an ADU to your property? Contact R&S General Construction for a free consultation and estimate.