IMPACTFEES.ORG

Key West, Florida Impact Fees

Key West applies its own fee schedule: municipal fees plus the Monroe County-levied fees that apply inside city limits. Combined, a new single-family home pays at least $5,279.00 per unit (rates sourced July 17, 2026). 3 additional fees have no published standard amounts and are not included, so the full cost may be higher; verify before budgeting. The full breakdown is below.

Key West impact fees by project type

Key West: Single-Family Impact Fees

A new single-family home in Key West pays at least $5,279.00 per unit in impact fees (rates sourced July 17, 2026). Every line item is levied at the municipal or utility level.

The largest line items are Water System Development Charge (FKAA) ($5,279.00).

Sewer System Development/Capacity Fee (City of Key West / KW Resort Utilities) is set by the utility and not published online. County Impact Fees within Key West (applicability) is set by the county and has no published standard rate. City Impact Fees (City of Key West, Ch. 54) is set by the city and has no published standard rate. Contact the levying jurisdiction or utility to verify before budgeting; they are not included as dollar figures here.

View the full fee schedule
Water$5,279.00
  • Water System Development Charge (FKAA)
    Florida Keys Aqueduct Authority
    FKAA is the sole potable water provider in Key West and countywide. CONFIRMED 7/13/2026 from FKAA 'Summary of Water Rates, Fees and Charges' §48-204, adopted Oct 2025, effective 10/1/2025 (FY26): Residential Single-Family standalone dwelling Water SDC = $5,279.00 at 5/8"x3/4" meter ($13,196.00 at 1"). SUPERSEDES the $3,750 FY22 figure previously stored (41% understatement). Separate one-time Tapping/Meter Installation Fee also applies: $1,760 at 5/8"x3/4". Read via Google-viewer render of the image-based FY26 PDF.
    $5,279.00
Sewer$0.00
  • Sewer System Development/Capacity Fee (City of Key West / KW Resort Utilities)
    City of Key West / KW Resort Utilities
    Key West wastewater is NOT FKAA — served by the City of Key West (Richard A. Heyman Environmental Center, Fleming Key) and by KW Resort Utilities (eastern Key West / Stock Island). Sewer capacity / system development fee not confirmed; the city's Rates page carries monthly rates only. $0 placeholder — City of Key West Utilities/Engineering; KW Resort Utilities 305-295-3301.
    Requires confirmation
City$0.00
  • City Impact Fees (City of Key West, Ch. 54)
    City of Key West
    Key West runs its own impact fee program under Code of Ordinances Ch. 54 (§54-56 et seq.; categories incl. transportation, parks/recreation, police, fire). In 2024 the City amended the ordinance to reduce impact fees 25% from the effective date. Re-checked 7/13/2026: the City's posted 'Planning Fee Schedule' (eff. 10/1/2025, Res. 21-182, rev. 12/9/2025) is APPLICATION/PROCESSING fees only and contains no impact fees; the Municode Ch. 54 deep link does not resolve by nodeId. Per-category dollar amounts still not web-confirmed. $0 placeholder — Key West Planning 305-809-3764; City Clerk 305-809-3831.
    Requires confirmation
County$0.00
  • County Impact Fees within Key West (applicability)
    Monroe County BOCC
    Monroe County LDC Ch. 126 fair-share fees generally apply only in the unincorporated county; Key West runs its own impact fee program (Code §54-56 et seq.). Confirm whether any county overlay fee is also collected inside city limits. Moot until the BOCC impact fee resolution surfaces — Ch. 126 carries no amounts (re-proved 7/13/2026). $0 placeholder — Monroe County Planning 305-289-2500.
    Requires confirmation
Total (Key West): $5,279.00
Sources last checked July 17, 2026Official fee schedules:Florida Keys Aqueduct Authority City of Key West / KW Resort Utilities City of Key West Monroe County BOCC
Fees flagged "Requires confirmation" have no confirmed published amount. Confirm them with the jurisdiction or utility before budgeting.

Where in Monroe County are you building?

Each jurisdiction applies its own fee schedule. Pick yours. = one or more fees are unconfirmed or have no published amount; the figure shown may not be the complete cost.

Unincorporated Monroe County$13,167.00Includes unconfirmed feesIslamorada$5,279.00Includes unconfirmed feesKey Colony Beach$5,279.00Includes unconfirmed fees
Key West$5,279.00this pageIncludes unconfirmed fees
Layton$13,167.00Includes unconfirmed feesMarathon$5,279.00Includes unconfirmed fees

Key West: Multifamily Impact Fees

A new multifamily unit in Key West pays at least $1,060.00 per unit in impact fees (rates sourced July 17, 2026). Every line item is levied at the municipal or utility level.

Water SDC (FKAA, MF 4+ units) — 10 FV × $106/FV is shown at the last published amount but has not been confirmed with the jurisdiction; it is included in the totals here. Verify before budgeting.

Sewer SDC/Capacity Fee (City of Key West / KW Resort Utilities, MF) is set by the utility and not published online. County Impact Fees within Key West (applicability, MF) is set by the county and has no published standard rate. City Impact Fees (City of Key West, Ch. 54, MF) is set by the city and has no published standard rate. Contact the levying jurisdiction or utility to verify before budgeting; they are not included as dollar figures here.

Some fees are tiered by unit size or building type; amounts reflect the representative tier noted in the schedule below.

View the full fee schedule
Water$1,060.00
  • Water SDC (FKAA, MF 4+ units) — 10 FV × $106/FV
    Florida Keys Aqueduct Authority
    BASIS CHANGED in FY26. FKAA §48-204 (eff 10/1/2025): multi-unit (4+) water SDC is Fixture-Value based at $106.00/FV; FY22 flat $2,813/unit is gone. Modeled on canonical MF unit (2BR/2BA ≈ 10 FV) = $1,060/unit. UNCONFIRMED — confirm FV count with FKAA 305-296-2454.
    $1,060.00Requires confirmation
Sewer$0.00
  • Sewer SDC/Capacity Fee (City of Key West / KW Resort Utilities, MF)
    City of Key West / KW Resort Utilities
    Key West wastewater is not FKAA (City of Key West + KW Resort Utilities on Stock Island). MF sewer capacity fee scales with master-meter/EDU. City Rates page carries monthly rates only. $0 placeholder — KW Resort Utilities 305-295-3301; City Utilities.
    Requires confirmation
City$0.00
  • City Impact Fees (City of Key West, Ch. 54, MF)
    City of Key West
    Key West runs its own impact fee program, Code Ch. 54 (§54-56 et seq.: transportation, parks, police, fire); reduced 25% by 2024 amendment. Re-checked 7/13/2026: the city's posted Planning Fee Schedule (eff 10/1/2025) is application fees only. MF per-category amounts not web-confirmed. $0 placeholder — Key West Planning 305-809-3764.
    Requires confirmation
County$0.00
  • County Impact Fees within Key West (applicability, MF)
    Monroe County BOCC
    Confirm whether county Ch. 126 fees are collected within Key West (typically unincorporated-only; KW runs its own program under Code §54-56 et seq.). $0 placeholder — Monroe County Planning 305-289-2500.
    Requires confirmation
Total (Key West): $1,060.00
Sources last checked July 17, 2026Official fee schedules:Florida Keys Aqueduct Authority City of Key West / KW Resort Utilities City of Key West Monroe County BOCC
Amounts flagged "Requires confirmation" are the last published figures, included in the totals. Confirm them with the jurisdiction or utility before budgeting.

Where in Monroe County are you building?

Each jurisdiction applies its own fee schedule. Pick yours. = one or more fees are unconfirmed or have no published amount; the figure shown may not be the complete cost.

Unincorporated Monroe County$3,150.00Includes unconfirmed feesIslamorada$1,060.00Includes unconfirmed feesKey Colony Beach$1,060.00Includes unconfirmed fees
Key West$1,060.00this pageIncludes unconfirmed fees
Layton$3,150.00Includes unconfirmed feesMarathon$1,060.00Includes unconfirmed fees

Key West: Commercial Impact Fees

Commercial development in Key West pays no per-square-foot impact fees (rates sourced July 17, 2026).

Water System Development Charge (FKAA) and Sewer Impact Fee (City of Key West) are set by the utility and not published online. Solid Waste Impact Fee (City of Key West, Commercial) and Traffic Impact Fee (City of Key West, Commercial) — per trip end are set by the city and have no published standard rate. Contact the levying jurisdiction or utility to verify before budgeting; they are not included as dollar figures here.

View the full fee schedule
Water$0.00
  • Water System Development Charge (FKAA)
    Florida Keys Aqueduct Authority
    FKAA §48-204 Commercial Water System Development Charge, eff 10/1/2025 (FY26 schedule adopted Oct 2025). PRIMARY basis: $106.00 per Fixture Value (total FV at premises incl. irrigation). Meter-based SDC only where FV cannot be determined: 5/8"=$5,279; 1"=$13,196; 1.5"=$26,390; 2"=$42,224; 3"=$79,170; 4"=$131,950; 6"=$263,899; 8"=$422,239. Separate one-time Tapping/Meter Installation Fee (1"=$2,346). FKAA is the sole countywide potable water provider (all Florida Keys). Read via Google-viewer render of image PDF DocumentCenter/View/1771.
    Contact jurisdiction/utility to verify
Sewer$0.00
  • Sewer Impact Fee (City of Key West)
    City of Key West
    Key West Code §54-154 (Div. 4 sewer impact fee ordinance; amended Ord. 24-27, adopted 10/10/2024): $2.00 per gallon per day of estimated sewage flow. Flow = 95% of highest-6-month avg water consumption (FKAA billing); for new uses, FAC flow estimates for most-nearly-approximate use. Applies to any development creating increased city-sewer demand. KW Resort Utilities serves eastern Key West/Stock Island separately (private, unpublished, 305-295-3301).
    Contact jurisdiction/utility to verify
City$0.00
  • Solid Waste Impact Fee (City of Key West, Commercial)
    City of Key West
    Key West Code §54-118 Table 7-6 (amended Ord. 24-27, adopted 10/10/2024), Retail row, per 100 SF GFA. 4-year phase-in: Yr1 $96.75 / Yr2 $107.50 / Yr3 $118.25 / Yr4 $129.00. Year 2 amount shown (assumed current; phase-in dates from adoption 10/10/2024 — verify current year); next step-up ~10/1/2026.
    Requires confirmation
  • Traffic Impact Fee (City of Key West, Commercial) — per trip end
    City of Key West
    Key West Code §54-83 (Div. 2 traffic impact fee ordinance; amended Ord. 24-27, adopted 10/10/2024): $30.00 per vehicular trip end of estimated traffic generation (ITE/FDOT trip-gen for most-nearly-approximate use). Applies to any traffic-generating building permit; credit for pre-existing use.
    Contact jurisdiction/utility to verify
Total (Key West): $0.00
Sources last checked July 17, 2026Official fee schedules:Florida Keys Aqueduct Authority City of Key West
Fees flagged "Requires confirmation" have no confirmed published amount. Confirm them with the jurisdiction or utility before budgeting.

Where in Monroe County are you building?

Each jurisdiction applies its own fee schedule. Pick yours. Totals shown are for a 50,000 sq ft building, including one-time water/sewer fees (assuming a 1-inch meter). = one or more fees are unconfirmed or have no published amount; the figure shown may not be the complete cost.

Unincorporated Monroe County$0.00Includes unconfirmed feesIslamorada$0.00Includes unconfirmed feesKey Colony Beach$0.00Includes unconfirmed fees
Key West$0.00this pageIncludes unconfirmed fees
Layton$0.00Includes unconfirmed feesMarathon$0.00Includes unconfirmed fees

Key West: Industrial Impact Fees

Industrial development in Key West pays no per-square-foot impact fees (rates sourced July 17, 2026).

Water System Development Charge (FKAA) and Sewer Impact Fee (City of Key West) are set by the utility and not published online. Traffic Impact Fee (City of Key West, Industrial) — per trip end and Solid Waste Impact Fee (City of Key West, Industrial) are set by the city and have no published standard rate. Contact the levying jurisdiction or utility to verify before budgeting; they are not included as dollar figures here.

View the full fee schedule
Water$0.00
  • Water System Development Charge (FKAA)
    Florida Keys Aqueduct Authority
    FKAA §48-204 Commercial Water System Development Charge, eff 10/1/2025 (FY26 schedule adopted Oct 2025). PRIMARY basis: $106.00 per Fixture Value (total FV at premises incl. irrigation). Meter-based SDC only where FV cannot be determined: 5/8"=$5,279; 1"=$13,196; 1.5"=$26,390; 2"=$42,224; 3"=$79,170; 4"=$131,950; 6"=$263,899; 8"=$422,239. Separate one-time Tapping/Meter Installation Fee (1"=$2,346). FKAA is the sole countywide potable water provider (all Florida Keys). Read via Google-viewer render of image PDF DocumentCenter/View/1771.
    Contact jurisdiction/utility to verify
Sewer$0.00
  • Sewer Impact Fee (City of Key West)
    City of Key West
    Key West Code §54-154 (Div. 4 sewer impact fee ordinance; amended Ord. 24-27, adopted 10/10/2024): $2.00 per gallon per day of estimated sewage flow. Flow = 95% of highest-6-month avg water consumption (FKAA billing); for new uses, FAC flow estimates for most-nearly-approximate use. Applies to any development creating increased city-sewer demand. KW Resort Utilities serves eastern Key West/Stock Island separately (private, unpublished, 305-295-3301).
    Contact jurisdiction/utility to verify
City$0.00
  • Traffic Impact Fee (City of Key West, Industrial) — per trip end
    City of Key West
    Key West Code §54-83 (Div. 2 traffic impact fee ordinance; amended Ord. 24-27, adopted 10/10/2024): $30.00 per vehicular trip end of estimated traffic generation (ITE/FDOT trip-gen for most-nearly-approximate use). Applies to any traffic-generating building permit; credit for pre-existing use.
    Contact jurisdiction/utility to verify
  • Solid Waste Impact Fee (City of Key West, Industrial)
    City of Key West
    Key West Code §54-118 Table 7-6 has NO industrial/manufacturing row (uses listed: Office, Retail, Restaurant, Bar/Lounge, Theater, Marina, Hotel/Motel). Industrial solid-waste fee set administratively by most-nearly-approximate use. $0 placeholder.
    Requires confirmation
Total (Key West): $0.00
Sources last checked July 17, 2026Official fee schedules:Florida Keys Aqueduct Authority City of Key West
Fees flagged "Requires confirmation" have no confirmed published amount. Confirm them with the jurisdiction or utility before budgeting.

Where in Monroe County are you building?

Each jurisdiction applies its own fee schedule. Pick yours. Totals shown are for a 50,000 sq ft building, including one-time water/sewer fees (assuming a 1-inch meter). = one or more fees are unconfirmed or have no published amount; the figure shown may not be the complete cost.

Unincorporated Monroe County$0.00Includes unconfirmed feesIslamorada$0.00Includes unconfirmed feesKey Colony Beach$0.00Includes unconfirmed fees
Key West$0.00this pageIncludes unconfirmed fees
Layton$0.00Includes unconfirmed feesMarathon$0.00Includes unconfirmed fees

Key West: Office Impact Fees

Office development in Key West pays no per-square-foot impact fees (rates sourced July 17, 2026).

Water System Development Charge (FKAA) and Sewer Impact Fee (City of Key West) are set by the utility and not published online. Traffic Impact Fee (City of Key West, Office) — per trip end and Solid Waste Impact Fee (City of Key West, Office) are set by the city and have no published standard rate. Contact the levying jurisdiction or utility to verify before budgeting; they are not included as dollar figures here.

View the full fee schedule
Water$0.00
  • Water System Development Charge (FKAA)
    Florida Keys Aqueduct Authority
    FKAA §48-204 Commercial Water System Development Charge, eff 10/1/2025 (FY26 schedule adopted Oct 2025). PRIMARY basis: $106.00 per Fixture Value (total FV at premises incl. irrigation). Meter-based SDC only where FV cannot be determined: 5/8"=$5,279; 1"=$13,196; 1.5"=$26,390; 2"=$42,224; 3"=$79,170; 4"=$131,950; 6"=$263,899; 8"=$422,239. Separate one-time Tapping/Meter Installation Fee (1"=$2,346). FKAA is the sole countywide potable water provider (all Florida Keys). Read via Google-viewer render of image PDF DocumentCenter/View/1771.
    Contact jurisdiction/utility to verify
Sewer$0.00
  • Sewer Impact Fee (City of Key West)
    City of Key West
    Key West Code §54-154 (Div. 4 sewer impact fee ordinance; amended Ord. 24-27, adopted 10/10/2024): $2.00 per gallon per day of estimated sewage flow. Flow = 95% of highest-6-month avg water consumption (FKAA billing); for new uses, FAC flow estimates for most-nearly-approximate use. Applies to any development creating increased city-sewer demand. KW Resort Utilities serves eastern Key West/Stock Island separately (private, unpublished, 305-295-3301).
    Contact jurisdiction/utility to verify
City$0.00
  • Traffic Impact Fee (City of Key West, Office) — per trip end
    City of Key West
    Key West Code §54-83 (Div. 2 traffic impact fee ordinance; amended Ord. 24-27, adopted 10/10/2024): $30.00 per vehicular trip end of estimated traffic generation (ITE/FDOT trip-gen for most-nearly-approximate use). Applies to any traffic-generating building permit; credit for pre-existing use.
    Contact jurisdiction/utility to verify
  • Solid Waste Impact Fee (City of Key West, Office)
    City of Key West
    Key West Code §54-118 Table 7-6 (amended Ord. 24-27, adopted 10/10/2024), Office row, per 100 SF GFA. 4-year phase-in: Yr1 $45.01 / Yr2 $47.03 / Yr3 $47.03 / Yr4 $47.03. Year 2 amount shown (assumed current; verify current phase year).
    Requires confirmation
Total (Key West): $0.00
Sources last checked July 17, 2026Official fee schedules:Florida Keys Aqueduct Authority City of Key West
Fees flagged "Requires confirmation" have no confirmed published amount. Confirm them with the jurisdiction or utility before budgeting.

Where in Monroe County are you building?

Each jurisdiction applies its own fee schedule. Pick yours. Totals shown are for a 25,000 sq ft building, including one-time water/sewer fees (assuming a 1-inch meter). = one or more fees are unconfirmed or have no published amount; the figure shown may not be the complete cost.

Unincorporated Monroe County$0.00Includes unconfirmed feesIslamorada$0.00Includes unconfirmed feesKey Colony Beach$0.00Includes unconfirmed fees
Key West$0.00this pageIncludes unconfirmed fees
Layton$0.00Includes unconfirmed feesMarathon$0.00Includes unconfirmed fees

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How impact fees work in Florida

Florida impact fees are one-time charges on new development, governed by Section 163.31801, Florida Statutes (the Florida Impact Fee Act). The statute requires fees to be based on the most recent and localized data, spent on the infrastructure category they were collected for, and adopted by ordinance.

Since 2021, the law also limits how fast fees can rise: increases up to 25% phase in over two years, increases of 25–50% phase in over four years, and increases above 50% are allowed only with a demonstrated extraordinary-circumstances study and at least a two-thirds vote of the governing body.

Counties and cities can both levy impact fees. Inside an incorporated city, a project typically pays the county's countywide fees plus any municipal fees the city has adopted, which is why totals differ between a city and the unincorporated county around it.

Frequently asked questions

What are the total impact fees for a single-family home in Key West, Florida?

A new single-family home in Key West pays at least $5,279.00 per unit in combined impact fees (rates sourced July 17, 2026). 3 additional fees have no published standard amounts and are not included, so the full cost may be higher; verify before budgeting.

How much are commercial impact fees in Key West?

Key West does not currently levy impact fees on commercial development.

Does Key West charge its own impact fees?

Yes. Key West levies its own municipal impact or utility fees, and county-levied fees also apply inside city limits. The schedule on this page shows every fee that applies to development in Key West, with the combined total.

Can Florida impact fees increase at any time?

No. Section 163.31801, Florida Statutes limits increases to 50% at most, phased in over two to four years, unless the local government makes extraordinary-circumstances findings and approves the increase by at least a two-thirds vote.

Fee amounts on this page are compiled from official published schedules and are provided for planning purposes only. Rates change, and project specifics (unit size, meter size, location within special districts) can alter what applies. Always verify current fees with the jurisdiction and utility before relying on them.

Compare unincorporated rates and every other city on the Monroe County impact fees page.

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