Free Construction Cost API | EstimationPro AI

Quick Start

Base URL: https://estimationpro.ai/api/v1

# Get roofing costs in Los Angeles
curl "https://estimationpro.ai/api/v1/costs?trade=roofing&zip=90210"

# Get the cost index for all metros
curl "https://estimationpro.ai/api/v1/index"

# Check material price trends
curl "https://estimationpro.ai/api/v1/trends"

Get the Data

Three ways to access U.S. construction cost data, all free:

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API

Call endpoints directly from your app. JSON responses, no API key required.

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Kaggle

Download the full dataset as CSV. 385 items, regional multipliers, and the EPCI cost index.

Get on Kaggle →

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Embed

Embed interactive cost calculators on your site. 40+ tools for contractors and homeowners.

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Rate Limits

All endpoints are rate-limited per IP address. Limits reset at midnight UTC.

Endpoint	Limit
Most endpoints	100 requests/day
`/api/v1/index`	500 requests/day

Rate limit headers (X-RateLimit-Remaining, X-RateLimit-Reset) are included in every response.

Response Format

All responses are JSON with a data field containing the result and a meta field with attribution:

{
  "data": { ... },
  "meta": {
    "source": "EstimationPro.ai Construction Cost API",
    "url": "https://estimationpro.ai/api",
    "methodology": "BLS OEWS + PPI + contractor feedback",
    "updated": "2026-03-18",
    "license": "Free for non-commercial use with attribution"
  }
}

Endpoints

GET /api/v1/trades 100/day

Returns all 32 construction trades with item counts.

Example Response

{
  "data": {
    "trades": [
      { "trade": "concrete", "itemCount": 12 },
      { "trade": "roofing", "itemCount": 15 },
      { "trade": "electrical", "itemCount": 18 }
    ],
    "totalItems": 385
  },
  "meta": { "source": "EstimationPro.ai Construction Cost API", ... }
}

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GET /api/v1/costs 100/day

Returns all pricing items for a trade. Optionally adjusted for regional pricing by ZIP code or state.

Parameters

Name	Required	Description
`trade`	Required	Trade name (e.g., "roofing", "concrete", "electrical")
`zip`	Optional	ZIP code for regional price adjustment
`state`	Optional	State code (e.g., "CA", "TX") for regional adjustment

Example Response

{
  "data": {
    "trade": "roofing",
    "location": "California",
    "multiplier": 1.18,
    "itemCount": 15,
    "items": [
      {
        "id": "architectural-shingle",
        "description": "Architectural shingle, installed",
        "unit": "sq ft",
        "low": 4.13,
        "typical": 5.90,
        "high": 8.85,
        "volatility": "standard",
        "lastVerified": "2026-02-15",
        "regionallyAdjusted": true
      }
    ]
  }
}

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GET /api/v1/costs/:itemId 100/day

Returns full detail for a specific pricing item including sources.

Parameters

Name	Required	Description
`itemId`	Required	Item ID (e.g., "ready-mix-standard", "romex-12-2")

Example Response

{
  "data": {
    "trade": "concrete",
    "id": "ready-mix-standard",
    "description": "Ready-mix concrete (3000-4000 PSI), delivered",
    "unit": "cubic yard",
    "low": 110,
    "high": 200,
    "typical": 150,
    "tolerance": 0.35,
    "regional": true,
    "volatility": "volatile",
    "sources": ["Angi 2026 concrete cost guide", "HomeAdvisor 2025-2026 data"],
    "lastVerified": "2026-02-15"
  }
}

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GET /api/v1/index 500/day

Returns the EstimationPro Cost Index for 51 states and 50 metro areas. EPCI = 100 at national average. Includes project-specific costs for bathroom remodels, kitchen remodels, deck builds, interior paint, and roof replacements.

Example Response

{
  "data": {
    "meta": { "methodology": "EPCI = 100 * regional multiplier..." },
    "index": {
      "metro:new-york-newark-jersey-city": {
        "name": "New York-Newark-Jersey City, NY-NJ-PA",
        "epci": 118,
        "projects": {
          "bathroom_remodel": { "low": 14160, "typical": 23600, "high": 35400 }
        }
      },
      "state:TX": { "name": "TX", "epci": 90, ... }
    }
  }
}

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GET /api/v1/trends 100/day

Returns commodity prices (copper, aluminum, lumber, steel), FRED economic indicators (construction spending, housing starts, building permits, Case-Shiller), and BLS PPI series data.

Example Response

{
  "data": {
    "commodities": [
      { "commodity": "copper", "latestPrice": 12986.61, "unit": "USD/metric ton", "trendDirection": "up" }
    ],
    "economicIndicators": [
      { "seriesId": "HOUST", "title": "Housing Starts", "latestValue": 1487, "yearOverYearChange": 9.5 }
    ],
    "ppiSeries": [
      { "id": "WPU08", "name": "Lumber & Wood Products", "changePercent": 3.2 }
    ]
  }
}

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GET /api/v1/multipliers 100/day

Returns the regional cost multiplier for a ZIP code or state. Use this to adjust national average prices to local market rates.

Parameters

Name	Required	Description
`zip`	Optional	ZIP code (one of zip or state required)
`state`	Optional	State code (one of zip or state required)

Example Response

{
  "data": {
    "location": "98101",
    "resolvedState": "WA",
    "region": "Pacific",
    "multiplier": 1.21,
    "label": "Washington (Pacific region)",
    "stateDetail": { "multiplier": 1.07, "region": "pacific" },
    "regionDetail": { "name": "Pacific", "multiplier": 1.13, "laborMultiplier": 1.21 }
  }
}

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Data Sources

Material pricing: 385 items sourced from Angi, HomeAdvisor, Fixr, and Home Depot retail data. Updated monthly.
Regional multipliers: BLS Occupational Employment and Wage Statistics (OEWS) for 16 construction trades across 50 metros.
Material trends: BLS Producer Price Index (PPI) for 11 commodity series, updated monthly on the 15th.
Economic indicators: Federal Reserve Economic Data (FRED) for construction spending, housing starts, building permits, and Case-Shiller home prices.
Commodity prices: Alpha Vantage (copper, aluminum), FRED (lumber PPI, steel PPI), updated weekly.
Contractor feedback: Anonymous aggregation from EstimationPro user edits, graduated into the database weekly.

Kaggle Dataset

The full construction cost dataset is available on Kaggle for download, analysis, and use in your own projects. Includes 385 pricing items across 32 trades, regional multipliers for all 50 states, and the EPCI cost index for 50 metro areas.

385 pricing items with low/typical/high ranges, units, volatility tiers, and source citations
Regional multipliers for all 50 states and 8 BLS regions, derived from OEWS wage data
EPCI cost index (EstimationPro Cost Index) for 50 metro areas with project-specific cost breakdowns
CSV format for easy import into Excel, Google Sheets, Python, R, or any data tool

View on Kaggle →

GitHub

This API is listed in the public-apis directory, the largest open-source list of free APIs on GitHub. Star or follow the PR to stay updated.

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Attribution

This API is free for non-commercial use. Please include attribution when displaying data from this API:

Data from <a href="https://estimationpro.ai/api">EstimationPro.ai Construction Cost API</a>