Impact Fees Explained: The Five-Figure Surprise in Your Build Budget
Data version: Q2 2026 · Last updated 2026-06-10
TL;DR. Impact fees fund the roads, schools, and water capacity your new home adds demand to — and they can run from a few thousand dollars to over $50,000 depending on the city. Here is how they work and how to budget for them.
Summary
Impact fees are one-time charges a city collects at building-permit issuance to cover the infrastructure cost a project adds — separate from the building permit fee, and in high-growth markets often the largest single soft cost in a project. Categories typically assessed together: transportation/road, school (often the largest), water and sewer capacity, parks and recreation, fire/public safety, and drainage/stormwater. Water and sewer connection ("tap") fees alone can run $10,000-$30,000 in capacity-constrained western and coastal cities. The spread between metros exceeds 10x for an identical house: much of the Midwest and South totals under $10,000, while fast-growing western and California metros routinely exceed $40,000-$50,000 per single-family home. To find your number: pull the city's published impact fee schedule, match the project type, add every applicable category, and check for credits — infill, affordable housing, and ADUs are often partially exempt. Budgeting rule of thumb before pulling the schedule: $8,000-$15,000 total in moderate markets, $30,000+ in high-growth western metros. Fees are usually due at permit issuance and are generally not financed by a construction loan, so find the number before closing on the land.
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