Kuna, ID vs Twin Falls, ID: Development Impact Fees Compared (2026)
A single-family home pays about $19,153 in Kuna vs $9,343 in Twin Falls — Kuna is $9,810 (105%) higher. Every figure below is normalized per dwelling unit by category, with links to each jurisdiction’s official sources.
City
Kuna, ID
$19,153
Total per single-family home
impact + connection fees
$10,595
Impact / development fees
roads, parks, schools…
$8,558
Water & sewer connection
tap / capacity / SDC
$2,371
Per multifamily unit
total fees / unit
Impact / development fees
| Fee (local term) | Basis | Amount | Source · effective |
|---|---|---|---|
Transportation / roads ACHD Transportation/Road Impact Fee — Single Family — Levied by the SEPARATE Ada County Highway District (ACHD), not the City of Kuna, but collected at the city building-permit. ACHD Ordinance 254, single service area covering all of Ada County (no service-area variants). VERIFIED verbatim in official ACHD Exhibit A PDF ($5,803 for ITE code 210, Per Dwelling Unit) and corroborated by KTVB/Mountain States reports of adoption. Exhibit A is headed 'Draft ... Effective TBD' but its figures match the adopted-ordinance news reports, so amount = adopted amount. | per dwelling unit | $5,803 | Ada County Highway District Mar 1, 2026High |
Parks & recreation City of Kuna Park Impact Fee — Residential — Kuna City Code 12-1-4, Ordinance No. 2024-33. Flat per dwelling unit (not tiered by home size). Applies to all residential dwelling units including multifamily. VERIFIED in codified Municode Title 12 ($2,604.00). | per dwelling unit | $2,604 | City of Kuna, ID (Municode) Oct 1, 2024High |
Police City of Kuna Police Department Impact Fee — Residential — Kuna City Code 12-3-3, Ordinance No. 2024-32. Non-residential = $0.11/sq ft. Flat per dwelling unit; applies to multifamily units too. VERIFIED in codified Municode Title 12 ($271.00). | per dwelling unit | $271 | City of Kuna, ID (Municode) Oct 1, 2024High |
Fire / EMS Fire District Impact Fee (Kuna Rural Fire District, collected by City) — Residential — Kuna City Code 12-2-3, Ordinance No. 2024-31 — a Kuna Rural Fire District impact fee collected by the City of Kuna on the district's behalf. VERIFIED $1,792 residential rate on Kuna Rural Fire District website (source 0) AND in codified Municode Title 12 (source 1). Flat per dwelling unit. | per dwelling unit | $1,792 | Kuna Rural Fire District Oct 1, 2024High |
Mitigation Well Mitigation Fee (water) — Resolution R18-2013. Additive water-connection mitigation charge per EDU. VERIFIED verbatim in R18-2013 PDF. | per dwelling unit | $125 | City of Kuna, ID Aug 1, 2013Mediumdated 2013 |
Water & sewer connection fees
| Fee (local term) | Basis | Amount | Source · effective |
|---|---|---|---|
Sewer connection (tap / SDC) Sewer Treatment Capacity Fee — Resolution R66-2020 (most recent adopted sewer fee resolution; supersedes R02-2020, effective 12/1/2020). Per EDU (equivalent dwelling unit); one SF home = 1 EDU. Due at time of connection. VERIFIED verbatim in R66-2020 PDF. Medium confidence given the operative resolution is from 2020. | per dwelling unit | $4,971 | City of Kuna, ID Dec 1, 2020Mediumdated 2020 |
Sewer connection (tap / SDC) Sewer Interceptor/Conveyance Capacity Fee — Resolution R66-2020. Additive to the treatment capacity fee (both apply). Per EDU, due at connection. VERIFIED verbatim in R66-2020 PDF. | per dwelling unit | $1,329 | City of Kuna, ID Dec 1, 2020Mediumdated 2020 |
Water connection (tap / SDC) Water Main Capacity Fee — Resolution R18-2013, the most recent published water connection fee resolution. Confirmed via the consolidated Water and Sewer System Fees Rate Structure (R01-2020/R62-2021, eff. 1/1/2022) that later resolutions changed only monthly user rates, not connection fees. Per EDU. VERIFIED verbatim in R18-2013 PDF. Medium confidence due to 2013 age — verify with Kuna Utility Billing. | per dwelling unit | $1,173 | City of Kuna, ID Aug 1, 2013Mediumdated 2013 |
Water connection (tap / SDC) Water Supply Fee — Resolution R18-2013. Additive to the water main capacity fee. Per EDU. VERIFIED verbatim in R18-2013 PDF. | per dwelling unit | $1,085 | City of Kuna, ID Aug 1, 2013Mediumdated 2013 |
Water connection (tap / SDC) Water Meter & Service Setter Fee — 3/4" (residential) — Resolution R18-2013. Standard residential 3/4" meter setter+service charge (representative meter size). Excluded from the additive impact-fee total to avoid double counting variants; larger meter sizes (1" $1,037, 1.5" $1,479, 2" $1,847) are mutually-exclusive alternatives. A separate 'Meter Only' 3/4" charge of $320 also exists. VERIFIED verbatim in R18-2013 PDF. alternative · not added to total | per meter | $700 | City of Kuna, ID Aug 1, 2013Mediumdated 2013 |
City
Twin Falls, ID
$9,343
Total per single-family home
impact + connection fees
$4,982
Impact / development fees
roads, parks, schools…
$4,361
Water & sewer connection
tap / capacity / SDC
—
Per multifamily unit
total fees / unit
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 |
What drives the difference
Kuna’s $19,153 per single-family home is $9,810 (105%) above Twin Falls’s $9,343. The largest single difference is in sewer connection (tap / sdc): Kuna charges about $6,300 there versus $618 in Twin Falls — a $5,682 swing that accounts for much of the overall gap. The two also differ in how much falls on water and sewer connection charges: $8,558 in Kuna versus $4,361 in Twin Falls.
Keep comparing
Kuna vs Twin Falls impact fees — FAQ
- Which has higher impact fees, Kuna or Twin Falls?
- Kuna, ID is higher. A single-family home pays about $19,153 per unit in Kuna versus $9,343 in Twin Falls, ID — $9,810 (105%) more, as of 2026.
- How much more does it cost to build a home in Kuna than in Twin Falls?
- About $9,810 more per single-family home — $19,153 in Kuna, ID versus $9,343 in Twin Falls, ID, a difference of 105% in total development impact and connection fees.
- What's the difference between impact fees in Kuna and Twin Falls for a single-family home?
- Kuna, ID charges about $19,153 per single-family home ($10,595 impact + $8,558 water/sewer connection), while Twin Falls, ID charges about $9,343 ($4,982 impact + $4,361 connection). Figures are normalized from official sources for 2026.