Caldwell, ID Development Impact Fees (2026)

What a single-family home pays in Caldwell

$14,197 total per unit across 6 fee categories.

At $14,197, Caldwell is below the Idaho tracked median of $19,123 — relatively affordable to build in.

Full fee schedule — single-family

Full fee schedule — multifamily

Coverage & caveats

Caldwell, ID residential development fees verified from official adopted City of Caldwell resolutions (all PDFs were scanned images requiring OCR; key residential figures were additionally confirmed by direct visual inspection of the rendered fee tables). WHAT EXISTS: 1) IMPACT FEES (Idaho Code 67-82 "Development Impact Fee Act"): Caldwell levies Parks, Fire, and Police impact fees. Currently adopted amounts are from Resolution 193-23, effective Oct 1, 2023: Parks $2,081.73/unit, Fire $1,070.37/unit, Police $184.01/unit (residential total $3,336.11/unit). These are flat per-dwelling-unit fees (not size-tiered). A May 15, 2007 vesting cutoff applies: lots occupied prior to that date are exempt; all new construction pays full impact fees. NOTE: A 2025 DRAFT impact-fee study (in planning case CPM25-000001/ZOA25-000002, Aug 2025) proposes RECALCULATED maximum-supportable fees that are substantially LOWER (draft Parks $951, Fire $649, Police $97 = $1,697 total) but this is NOT yet adopted; the Res 193-23 figures remain in effect. I report the adopted (Res 193-23) figures as the current fees. 2) TRANSPORTATION/TRAFFIC IMPACT FEE: NEW. Caldwell adopted the Caldwell Area CIP & Traffic Impact Fee Program (Resolution 429-24, passed Jan 21, 2025) jointly with HIGHWAY DISTRICT NO. 4 (HD4). This is the separate-district transportation impact fee that a Caldwell residential builder must pay; it is administered jointly by the City of Caldwell and HD4 for the CATS service area, and fees collected by the City are spent only on CIP projects within the City of Caldwell. Table 7 fee schedule: Single-Family $4,226/unit, Multifamily Low-Rise $2,293/unit, Multifamily Mid-Rise $1,753/unit, Mobile Home $2,607/unit, ADU $1,394/unit. (Note: HD4's SEPARATE "Mid-Star" service area TIF of ~$5,050/SF home applies to unincorporated Canyon County, NOT to the City of Caldwell, and is excluded.) 3) WATER CONNECTION FEES (Resolution 318-24, eff. Oct 1, 2024): For a single-family residence connecting to City water, the ADDITIVE components are Well Development Fee $898.64/unit + Trunk Line Fee $735.35/unit + Water Connection charge (3/4"x3/4" meter & service) $2,617.03/ea. A frontage-based Water Main Extension Fee of $39.75/ft (min $2,385 at 60 ft) may also apply when a new main is needed; included as a separate row but excluded from a simple per-unit total because it is frontage/situation-dependent and often waived when developer installs mains. Larger meter sizes are mutually-exclusive alternatives (excluded). Note: connection fees were increased ~50%/yr in FY2024-2026 per the Water Facilities Plan. 4) SEWER CONNECTION FEES (Resolution 316-24, eff. Oct 1, 2024): For a single-family residence, the ADDITIVE components are Interceptor Fee $1,170.93/unit + Plant Capacity Fee $1,213.30/connection (these two sum to the stated $2,384.23 residential minimum). A frontage-based Sewer Main Extension Fee of $42.38/ft (min $2,542.80 at 60 ft) may apply (separate row, excluded from per-unit total, frontage-dependent/often waived). A Stub-out Fee of $977.18 applies ONLY if the City elects to construct the service stub (conditional; excluded). WHAT DOES NOT EXIST HERE: - NO SCHOOL IMPACT FEE: Idaho state law (Idaho Code 67-82) does not authorize school impact fees; none is levied. (Vallivue School District serves most of Caldwell and cannot charge an impact fee.) - No drainage/stormwater impact fee, no library impact fee, no open-space/affordable-housing/general-capital impact fee identified — Caldwell's impact fees are limited to Parks, Fire, Police, and (new) Transportation. - Building/electrical/plumbing/mechanical PERMIT fees (Res 320-24) exist but are regulatory permit fees, not development impact/connection fees, so they are omitted per scope. KEY CAVEATS: (a) All four city fee resolutions were scanned-image PDFs OCR'd by the analyst; residential dollar figures cross-checked visually. (b) The traffic impact fee is brand-new (Jan 2025 adoption); the underlying plan document (Dec 2024 draft) still listed traffic fees as "currently HD4 and Nampa only," reflecting timing before Caldwell's adoption — Caldwell council subsequently approved implementation per KIVI-TV reporting. (c) Impact fees (Parks/Fire/Police) may be index-adjusted annually; the most recent ADOPTED schedule the analyst could locate is Res 193-23 (FY2024, eff. 10/1/2023); a newer index-adjusted resolution may exist but was not located, so confidence on currency is medium.

Representative single-family-detached one-time fee stack for a new home connecting to City water and sewer (excludes frontage-based main-extension fees and conditional stub-out, which vary by lot/are often waived): Parks $2,081.73 + Fire $1,070.37 + Police $184.01 + Transportation (Caldwell/HD4) $4,226 + Water (Well Dev $898.64 + Trunk Line $735.35 + Connection $2,617.03) + Sewer (Interceptor $1,170.93 + Plant Capacity $1,213.30) ≈ $14,197 per single-family home. Add frontage-based water main extension (~$2,385 min) and sewer main extension (~$2,542.80 min) where a new main must be installed and is not waived.

Sources

7 official sources · 13 high-confidence figures.

Caldwell impact fees — FAQ

How much are development impact fees in Caldwell, ID for a single-family home?

As of 2026-06-16, total development fees for a single-family detached home in Caldwell are about $14,197 per unit — roughly $7,562 in impact/development fees plus $6,635 in water/sewer connection fees. Figures are normalized from official sources; verify with the jurisdiction before relying on them.

What are the impact fees per multifamily unit in Caldwell, ID?

Total development fees for a multifamily unit in Caldwell are about $2,293 per unit as of 2026-06-16.

Are impact fees in Caldwell 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 Caldwell'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 Caldwell on 2026-06-16.