{
  "slug": "basement-waterproofing-cost",
  "title": "Basement Waterproofing Cost Calculator",
  "heading": "Basement Waterproofing Cost Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/basement-waterproofing-cost",
  "summary": "Interior drain tile, exterior excavation, sump, and sealing cost by wall length.",
  "description": "Basement waterproofing is quoted per linear foot of wall treated, and the method drives everything. Interior drain tile with a sump is the common fix: a channel cut in the slab at the footing, perforated pipe, gravel, new concrete, and a pump. Exterior waterproofing — excavating to the footing, cleaning and membraning the wall, and installing footing drains — solves the problem at the source but costs several times as much because of excavation and landscape restoration. This calculator prices your chosen method by wall length, adds sump and battery backup, and includes optional crack injection. 2026 US national averages run roughly $60-$110 per linear foot for interior systems and $150-$350 per linear foot for exterior work.",
  "formula": "Cost = Wall LF × Method Rate × Depth Factor + Sump + Backup + (Cracks × Injection Cost) + Restoration.",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=basement-waterproofing-cost",
  "inputs": [
    {
      "id": "wallFt",
      "label": "Wall length treated",
      "kind": "number",
      "hint": null,
      "default": 90,
      "unit": "linear ft",
      "min": 10,
      "max": 500
    },
    {
      "id": "method",
      "label": "Method",
      "kind": "select",
      "hint": null,
      "default": "80",
      "options": [
        {
          "value": "45",
          "label": "Interior sealing + minor drainage — $45/ft"
        },
        {
          "value": "80",
          "label": "Interior drain tile + sump — $80/ft"
        },
        {
          "value": "150",
          "label": "Exterior membrane, shallow — $150/ft"
        },
        {
          "value": "250",
          "label": "Full exterior excavation — $250/ft"
        }
      ]
    },
    {
      "id": "depthFt",
      "label": "Basement wall depth below grade",
      "kind": "number",
      "hint": null,
      "default": 7,
      "unit": "ft",
      "min": 3,
      "max": 12
    },
    {
      "id": "sump",
      "label": "Sump pump + basin installed",
      "kind": "number",
      "hint": null,
      "default": 1400,
      "unit": "$",
      "min": 0,
      "max": 5000
    },
    {
      "id": "backup",
      "label": "Battery backup pump",
      "kind": "number",
      "hint": null,
      "default": 0,
      "unit": "$",
      "min": 0,
      "max": 2500
    },
    {
      "id": "cracks",
      "label": "Cracks to inject",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": null,
      "min": 0,
      "max": 20
    },
    {
      "id": "crackCost",
      "label": "Cost per crack injection",
      "kind": "number",
      "hint": null,
      "default": 450,
      "unit": "$",
      "min": 100,
      "max": 1200
    },
    {
      "id": "restoration",
      "label": "Landscape / finish restoration",
      "kind": "number",
      "hint": null,
      "default": 0,
      "unit": "$",
      "min": 0,
      "max": 15000
    }
  ],
  "outputs": [
    {
      "id": "totalCost",
      "label": "Total waterproofing cost",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "systemCost",
      "label": "Drainage / membrane system",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "sump",
      "label": "Sump pump",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "crackTotal",
      "label": "Crack injection",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "perFoot",
      "label": "Cost per linear ft",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Wall length treated: 90 linear ft",
      "Method: Interior drain tile + sump — $80/ft",
      "Basement wall depth below grade: 7 ft",
      "Sump pump + basin installed: 1400 $",
      "Battery backup pump: 0 $",
      "Cracks to inject: 2",
      "Cost per crack injection: 450 $",
      "Landscape / finish restoration: 0 $"
    ],
    "outputs": [
      "Total waterproofing cost: $9,500",
      "Drainage / membrane system: $7,200",
      "Sump pump: $1,400",
      "Crack injection: $900",
      "Cost per linear ft: $105.56"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter wall length treated (linear ft).",
      "Enter method.",
      "Enter basement wall depth below grade (ft).",
      "Enter sump pump + basin installed ($).",
      "Enter battery backup pump ($).",
      "Enter cracks to inject.",
      "Enter cost per crack injection ($).",
      "Enter landscape / finish restoration ($).",
      "Read your total waterproofing cost on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "wallFt": 55,
        "method": "80",
        "depthFt": 4.2,
        "sump": 850,
        "backup": 0,
        "cracks": 1,
        "crackCost": 275,
        "restoration": 0
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "wallFt": 90,
        "method": "80",
        "depthFt": 7,
        "sump": 1400,
        "backup": 0,
        "cracks": 2,
        "crackCost": 450,
        "restoration": 0
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "wallFt": 145,
        "method": "80",
        "depthFt": 11.200000000000001,
        "sump": 2250,
        "backup": 0,
        "cracks": 3,
        "crackCost": 725,
        "restoration": 0
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "Interior or exterior waterproofing — which do I need?",
      "a": "Interior drain tile manages water that reaches the footing and is the practical choice for most finished-basement seepage. Exterior work is warranted when the wall itself is failing, grading cannot be fixed, or you are already excavating for other repairs."
    },
    {
      "q": "Do I need a battery backup sump pump?",
      "a": "If the basement is finished or storms in your area routinely knock out power, yes — a pump that cannot run during the storm that floods you is not protection. Backups typically add $600-$1,800 installed."
    },
    {
      "q": "Will grading and gutters fix it instead?",
      "a": "Sometimes. Extending downspouts ten feet from the foundation and correcting negative grade solves a surprising number of wet basements for a few hundred dollars, and any honest contractor will suggest trying that first."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/sump-pump-installation-cost",
    "https://www.revenuelab.fyi/toolbox/french-drain-installation-cost"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Basement Waterproofing Cost Calculator (https://www.revenuelab.fyi/toolbox/basement-waterproofing-cost)"
}