每地块基础设施成本计算器 — 公式

Infrastructure Cost Breakdown

Infrastructure is typically the single largest cost component in land development after the land itself. Accurate estimation is essential for project feasibility.

Major Components

  • Roads: Roadbed preparation, paving, curbs, gutters, sidewalks, signage (35-40% of total)
  • Water: Main lines, service connections, fire hydrants, pressure systems (15-20%)
  • Sewer: Gravity lines, lift stations, connections, or septic systems (18-22%)
  • Electric & Gas: Underground or overhead distribution, transformer pads (10-12%)
  • Stormwater: Detention ponds, drainage pipes, inlets, grading (8-12%)
  • Landscaping: Common area landscaping, street trees, entrance features (5-8%)

    • Cost Variables

  • Terrain: Flat sites cost less; rocky or steep terrain increases costs significantly
  • Soil conditions: Poor soils require more grading and structural fill
  • Distance to connections: Longer utility runs to connect to existing infrastructure increase costs
  • Local standards: Some jurisdictions require wider roads, deeper utilities, or enhanced stormwater systems

    • Bidding Strategy

    Get at least 3 competitive bids from contractors, and include a 10-15% contingency for unexpected conditions.

    计算示例

    30-lot subdivision with $420,000 roads, $180,000 water, $210,000 sewer, $120,000 electric/gas, $95,000 stormwater, $60,000 landscaping.

    1. Total infrastructure: $420,000 + $180,000 + $210,000 + $120,000 + $95,000 + $60,000 = $1,085,000
    2. Cost per lot: $1,085,000 / 30 = $36,167
    3. Roads per lot: $420,000 / 30 = $14,000
    4. Water per lot: $180,000 / 30 = $6,000
    5. Sewer per lot: $210,000 / 30 = $7,000