Twin Falls, ID Development Impact Fees (2026)
Normalized development impact fees, water & sewer connection (tap/SDC) fees, and mitigation fees for Twin Falls, Idaho — per dwelling unit, by category, with links to every official source.
What a single-family home pays in Twin Falls
$9,343 total per unit across 6 fee categories.
- Water connection (tap / SDC)$3,743
- Parks & recreation$1,918
- Transportation / roads$1,683
- Fire / EMS$1,105
- Sewer connection (tap / SDC)$618
- Police$276
At $9,343, Twin Falls is below the Idaho tracked median of $19,153 — relatively affordable to build in.
Full fee schedule — single-family
Impact / development fees
| Fee (local term) | Basis | Amount | Source · effective |
|---|---|---|---|
Police Police Impact Fee — CONFIRMED via pdftotext -layout of the Master City-Wide Fee Schedule (line: 'Impact fee - police residential $ 276.00 Per dwelling unit. (see footnote Impact Fee #1)'). Flat per-dwelling-unit, not size-tiered. Idaho Code 67-82 impact fee; auto-adjusted every Jan 1 per municipal cost index (footnote Impact Fee #1, which states the fee is automatically adjusted on Jan 1 of each year using the municipal cost index). | per dwelling unit | $276 | City of Twin Falls, Idaho Jan 1, 2026High |
Fire / EMS Fire Impact Fee — CONFIRMED via pdftotext -layout of the Master City-Wide Fee Schedule (line: 'Impact fee - fire residential $ 1,105.00 Per dwelling unit. (see footnote Impact Fee #1)'). Flat per-unit. Fire non-residential is $0.55/sq ft (separate, not used). | per dwelling unit | $1,105 | City of Twin Falls, Idaho Jan 1, 2026High |
Parks & recreation Parks & Recreation Impact Fee — CONFIRMED via pdftotext -layout of the Master City-Wide Fee Schedule (line: 'Impact fee - parks residential $ 1,918.00 Per dwelling unit. (see footnote Impact Fee #1)'). Parks impact fee is residential-only (no parks non-residential line appears in the schedule). | per dwelling unit | $1,918 | City of Twin Falls, Idaho Jan 1, 2026High |
Transportation / roads Streets (Transportation) Impact Fee - Single-Family — CONFIRMED via pdftotext -layout of the Master City-Wide Fee Schedule (line: 'Impact fee - street single-family $ 1,683.00 Per dwelling unit. (see footnote Impact Fee #1)'). Streets/transportation impact fee is levied and COLLECTED BY THE CITY OF TWIN FALLS itself (Idaho Code 67-82) - there is NO separate highway district in the Twin Falls area. | per dwelling unit | $1,683 | City of Twin Falls, Idaho Jan 1, 2026High |
Water & sewer connection fees
| Fee (local term) | Basis | Amount | Source · effective |
|---|---|---|---|
Sewer connection (tap / SDC) Wastewater (Sewer) Capacity Fee - Single Family — CONFIRMED via pdftotext -layout, Engineering section (line: 'Wastewater capacity - Single family $ 512.54' under 'Wastewater capacity fees ... Connection to the WWTS'). Single-family per-unit sewer capacity buy-in (connection to the Wastewater Treatment System). | per dwelling unit | $513 | City of Twin Falls, Idaho Jan 1, 2026High |
Water connection (tap / SDC) Water Service (Complete) - 1 inch (mainline connection to meter) — CONFIRMED via pdftotext -layout, Engineering (line: 'Water service (complete) - 1 inch $ 3,088.47 Complete water service- mainline connection to meter'). 1-inch is the SMALLEST STANDARD RESIDENTIAL service in Twin Falls (no 3/4" or 5/8" offered), so 1-inch is the representative primary residential row. Larger sizes are mutually-exclusive alternatives (1.5" $3,933.90; 2" $4,553.93), correctly omitted. | per meter | $3,088 | City of Twin Falls, Idaho Jan 1, 2026High |
Water connection (tap / SDC) Water Meter Fee - 1 inch (Badger model #55) — CONFIRMED via pdftotext -layout (line: 'Water meter fee - 1 inch (Badger model #55) $ 449.28 Assessed with building permit'). ADDITIVE to the water service (complete) charge. 1-inch base residential meter. Larger: 1.5" $778.36; 2" $1,025.20 (excluded variants). | per meter | $449 | City of Twin Falls, Idaho Jan 1, 2026High |
Water connection (tap / SDC) Water Main Connection - 1 inch tap (tap by City crew) — CONFIRMED via pdftotext -layout (line: 'Water main connection - 1 inch tap $ 150.00 Connections to live water mains (tap by City crew)'). ADDITIVE charge for the City crew to tap a live main for a 1-inch residential service. Same $150 for 1"/1.5"/2" taps; larger taps cost more (excluded variants). | per meter | $150 | City of Twin Falls, Idaho Jan 1, 2026High |
Water connection (tap / SDC) Water Service Permit - 1 inch — CONFIRMED via pdftotext -layout (line: 'Water service permit - 1 inch water service $ 55.35 Assessed at subdivision construction plan approvals'). Small additive permit fee for 1-inch water service. 1.5" and 2" permits are also $55.35. | per meter | $55.35 | City of Twin Falls, Idaho Jan 1, 2026High |
Water connection (tap / SDC) Pressure Irrigation Service (per lot) — CONFIRMED via pdftotext -layout, Engineering (line: 'Pressure Irrigation Service $ 1,290.52 Per lot'). Twin Falls operates a municipal pressurized-irrigation system; new residential lots in PI service areas pay this per-lot connection charge. Correctly marked excludeFromTotal because it applies only where pressurized irrigation service is provided to the lot (situation-dependent). unitBasis 'per_acre' used as the closest schema proxy for the actual per-lot basis. alternative · not added to total | per acre | $1,291 | City of Twin Falls, Idaho Jan 1, 2026High |
Sewer connection (tap / SDC) Sewer Service Connection - Permit + Inspection — CONFIRMED via pdftotext -layout (lines: 'Sewer service connection - permit $ 15.00 Processing the permit' and 'Sewer service connection inspection $ 90.00 Inspection of sewer service connection to main line'). Additive: $15 permit + $90 inspection = $105 for the physical sewer service connection to the main line (separate from the $512.54 wastewater capacity buy-in). Included in the SF total as a small additive connection cost. | per dwelling unit | $105 | City of Twin Falls, Idaho Jan 1, 2026High |
Coverage & caveats
Twin Falls (CITY), Twin Falls County, Idaho. All figures independently re-verified by downloading the Master City-Wide Fee Schedule PDF (CivicPlus DocumentCenter View/5095) with a Chrome user-agent and extracting it with `pdftotext -layout`. Every surviving fee amount was matched verbatim against a line in that extracted text (impact-fee block on the Impact Fee table; connection/capacity figures in the Engineering section). WHAT EXISTS (Idaho Code 67-82 "Development Impact Fee Act" allows ONLY police, fire, parks & recreation, and street/transportation impact fees): 1) IMPACT FEES, flat PER DWELLING UNIT (not size-tiered): Police $276, Fire $1,105, Parks $1,918, Streets single-family $1,683 / multi-family $901. Per footnote "Impact Fee #1," the fees auto-adjust every January 1 using the municipal cost index. Police/Fire/Parks are charged per dwelling unit for ALL residential, so multifamily pays the same per-unit Police/Fire/Parks as single-family; only the Streets fee differs by type. Representative SF impact-fee total = $276 + $1,105 + $1,918 + $1,683 = $4,982.00/unit. 2) STREETS/TRANSPORTATION IMPACT FEE is levied and COLLECTED BY THE CITY OF TWIN FALLS itself - there is NO separate highway district in the Twin Falls area. Attribute the streets fee to the City. 3) SEWER (WASTEWATER) CAPACITY FEE - connection to the Wastewater Treatment System: Single family $512.54/unit; Apartments/Duplexes $408.47/du; Mobile home $303.27/du. Plus a physical sewer service connection permit ($15) + inspection ($90) = $105. 4) WATER CONNECTION (smallest standard residential service is 1-INCH): Water service (complete) 1" $3,088.47 + Water meter fee 1" (Badger #55) $449.28 + Water main connection 1" tap $150 + Water service permit 1" $55.35. Larger meter/service sizes (1.5", 2") are mutually-exclusive alternatives and excluded. 5) PRESSURIZED IRRIGATION: Pressure Irrigation Service $1,290.52/lot (situation-dependent, excluded from the universal per-unit total). WHAT DOES NOT EXIST HERE: NO school impact fee (not authorized by Idaho Code 67-82); NO drainage/stormwater, library, general/capital, open-space, affordable-housing, or mitigation impact fee; NO separate highway-district transportation fee. KEY CAVEAT: The dedicated "Impact Fee Rates Effective Jan 1, 2025" notice PDF (source index 1) stores its fee table as an embedded raster image - on re-fetch, `pdftotext` extracted only the header text ("Per the decision of City Council on December 9, 2023, the following Impact Fees are to be in effect on January 1, 2025"), not the dollar figures. However, NO surviving fee row sources its amount from that notice; every amount comes from source index 0 (the Master City-Wide Fee Schedule), which was fully extractable and matched verbatim. The prior-year ($269.28/$1,075.95/etc.) comparisons in the original notes are therefore left as commentary only and were not independently re-confirmed. VERIFY: confirmed 16 of 16 distinct fee rows (all amounts and sourceQuotes matched verbatim against source index 0 via pdftotext -layout); dropped 0. excludeFromTotal corrections: set excludeFromTotal=true on the Streets Multi-Family impact fee row ($901, multifamily) - the researcher had omitted the flag even though it is a multifamily land-use variant of the streets fee whose single-family counterpart ($1,683) is already in the SF representative total; leaving it unflagged would have double-counted a streets fee. All other excludeFromTotal flags (MF Police/Fire/Parks duplicates, Apartments sewer-capacity variant, Pressure Irrigation situational charge) were already correct and were verified. Representative SF total independently recomputed = $9,342.64 (matches; no double-counting after the correction).</coverageNotes> </invoke>
Representative one-time fee stack for a NEW single-family home in the City of Twin Falls connecting to City water and sewer (current Jan-1-2026-indexed impact fees from the Master City-Wide Fee Schedule): IMPACT FEES (per dwelling unit): Police $276.00 + Fire $1,105.00 + Parks $1,918.00 + Streets (single-family) $1,683.00 = $4,982.00. SEWER: Wastewater capacity (single family) $512.54 + sewer service connection permit $15 + inspection $90 = $617.54. WATER (1-inch standard residential service): Water service (complete) $3,088.47 + Water meter fee 1" $449.28 + Water main connection 1" tap $150.00 + Water service permit 1" $55.35 = $3,743.10. REPRESENTATIVE SF TOTAL = $4,982.00 (impact) + $617.54 (sewer) + $3,743.10 (water) = $9,342.64 per single-family home (independently re-computed; matches). Add Pressure Irrigation Service $1,290.52/lot where the lot is in a pressurized-irrigation service area (excluded from the base total as situation-dependent). Multifamily pays the same per-unit Police/Fire/Parks ($276/$1,105/$1,918) but a lower Streets fee ($901/unit) and lower sewer capacity ($408.47/unit). Twin Falls impact fees auto-adjust every January 1 by the municipal cost index (footnote Impact Fee #1). NO school impact fee exists (not permitted under Idaho Code 67-82), and there is no separate highway district - the streets impact fee is City-levied.
Sources
4 official sources · 16 high-confidence figures.
- 1Master City-Wide Fee Schedule (Exhibit B) - City of Twin Falls (current indexed schedule; impact fees reflect the Jan 1, 2026 inflation adjustment)City of Twin Falls, Idaho · fee schedule · effective Jan 1, 2026 · retrieved Jun 17, 2026
- 2Impact Fee Rates Effective January 1, 2025 - City of Twin Falls Planning & Zoning Department (dedicated impact-fee notice; per Council decision Dec 9, 2023)City of Twin Falls, Idaho - Planning & Zoning Department · fee schedule · effective Jan 1, 2025 · retrieved Jun 17, 2026
- 3Building Applications & Forms - City of Twin Falls (hosts Impact Fee Rates PDF and connection/capacity references)City of Twin Falls, Idaho - Building Department · municipal webpage · retrieved Jun 17, 2026
- 4City of Twin Falls, Idaho Impact Fee Study and Capital Improvement Plan (Final 2022) - basis for current Police/Fire/Parks/Streets impact feesCity of Twin Falls, Idaho · fee study · effective Jan 1, 2022 · retrieved Jun 17, 2026
Twin Falls impact fees — FAQ
- How much are development impact fees in Twin Falls, ID for a single-family home?
- As of 2026-06-17, total development fees for a single-family detached home in Twin Falls are about $9,343 per unit — roughly $4,982 in impact/development fees plus $4,361 in water/sewer connection fees. Figures are normalized from official sources; verify with the jurisdiction before relying on them.
- Are impact fees in Twin Falls the same as building permit fees?
- No. Impact fees (and water/sewer connection fees) fund off-site capital — roads, parks, schools, utilities — and are charged per new dwelling unit. Building permit and plan-review fees are separate and are not included here.
- How often do Twin Falls's impact fees change?
- Most jurisdictions adopt fees by ordinance and escalate them annually (often by a construction cost index), with occasional mid-year updates. Always confirm the current adopted schedule with the jurisdiction. ImpactFeeAtlas last verified Twin Falls on 2026-06-17.