What Are Impact Fees?
Impact fees are one-time charges collected by local governments — Orange County, the City of Orlando, and other municipalities — when new construction is permitted. They represent your share of the cost to expand public infrastructure to support the new dwelling unit: roads, schools, parks, libraries, fire stations, and water/sewer systems.
Every new ADU is treated as a new dwelling unit. That means impact fees apply — just as they would for any new home construction in Florida.
Key point: Impact fees are not part of your contractor’s bid. They are paid directly to the county or city government, typically at the time of permit issuance. R&S estimates them upfront so they are never a surprise.
Why Do Impact Fees Apply to ADUs?
An ADU — whether attached or detached — creates a new household. A new household uses roads to commute, children may enroll in schools, residents visit parks, and the additional dwelling places demand on water and sewer infrastructure. Impact fees are the mechanism local governments use to have new development pay for its share of that infrastructure expansion, rather than passing those costs entirely to existing taxpayers.
Even though the ADU is on a lot that is already connected to infrastructure, the additional unit is what triggers the fee — because it creates additional demand.
Orange County Impact Fees for ADUs
Orange County assesses multiple categories of impact fees for new dwelling units. The total varies based on the size and type of the ADU. As of 2025, approximate fee categories for a new residential unit in unincorporated Orange County include:
| Fee Category | Approximate Amount |
|---|---|
| Transportation (roads) | $5,000–$8,000 |
| Schools | $5,000–$9,000 |
| Parks & Recreation | $1,500–$3,000 |
| Fire / EMS | $500–$1,000 |
| Libraries | $200–$500 |
| Water & Sewer (connection) | $3,000–$8,000 |
| Estimated Total Range | $15,000–$30,000+ |
Note: These are estimates. Actual fees vary by ADU size, location, and the specific fee schedules in effect at the time of permit. Orange County updates its fee schedules periodically. R&S verifies the current schedule for your specific project at the time of permit application.
City of Orlando Impact Fees
Properties within the City of Orlando limits are subject to the City of Orlando’s impact fee schedule, which differs from Orange County’s. City of Orlando impact fees for a new ADU typically range from $12,000–$25,000 in total, depending on unit size and location within the city.
The City of Orlando assesses fees for transportation, parks, fire, police, and stormwater infrastructure. Water and sewer connection fees are assessed by Orlando Utilities Commission (OUC) or Orange County Utilities depending on the service area.
How Impact Fees Are Calculated
Impact fees are typically calculated based on:
- Unit type — single-family detached vs. attached unit (ADU rates are usually assessed at the attached/apartment rate, which is often lower than a full single-family detached home)
- Unit size (square footage) — larger units pay higher transportation and school impact fees in many categories
- Location — some areas within Orange County have specific Transportation Concurrency Exception Areas (TCEAs) or other designations that modify fee amounts
- Service area — which utility provider serves the property affects water/sewer connection fees
R&S calculates estimated impact fees for every ADU project as part of the initial cost estimate. You see the full cost picture before signing a contract.
When Do You Pay Impact Fees?
Impact fees in Orange County and the City of Orlando are typically due at the time of building permit issuance — before construction begins. This means you need to have those funds available upfront, in addition to your contractor payments.
Water and sewer connection fees may be split — a portion due at permit and a portion due at final inspection or meter installation. R&S will walk you through the specific payment schedule for your project.
How to Budget for Impact Fees
The most important thing is to treat impact fees as a separate line item in your total project budget — not as part of the construction contract. A common mistake is assuming the contractor’s bid covers everything. It does not. Impact fees are your direct cost to the government.
A realistic ADU budget in Orlando should account for:
- Construction cost (R&S contract) — the largest line item
- Impact fees — $15,000–$30,000 depending on location and unit size
- Permit fees — $1,500–$4,000 for plan review and building permits
- Engineering and design — included in R&S contract or quoted separately
- Utility connection / extension costs — varies by property
- Landscaping and site restoration — allow $2,000–$8,000
- Contingency (10%) — for unforeseen conditions
Are There Exemptions or Reductions?
Florida law allows certain impact fee exemptions and reductions. For ADUs, relevant considerations include:
- Affordable housing credits: Some jurisdictions offer impact fee reductions for ADUs that commit to affordable rental rates for a defined period — this varies by municipality and is not widely advertised
- Garage conversion ADUs: Converting an existing structure may be assessed differently than new construction in some fee categories — R&S verifies this during the permit process
- Fee credits for existing development: If your property already has impact fee credits from a prior permitted structure (for example, a detached garage that was previously counted), those may partially offset new fees — a fact pattern R&S verifies for every project
Important: Impact fee exemptions and reductions are property-specific. R&S investigates every applicable credit or reduction for your project — it is not something most homeowners know to ask about.
How R&S Helps You Plan for Impact Fees
R&S includes a detailed impact fee estimate in every ADU proposal. We verify the current fee schedules, apply the correct unit type and size classification, and flag any credits or reductions that may apply to your property. You will know the full cost of your ADU — including impact fees — before you commit to anything.
We also work with lending partners who can incorporate impact fees into your construction financing, so you are not required to pay them out of pocket at permit issuance if that creates a cash flow challenge.