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LADU ADU Tools

LADU ADU Tools

by ladu-dev

LADU MCP Server

Real ADU data for Los Angeles County, available to any MCP-compatible AI assistant.

Endpoint: https://www.ladu.co/mcp
Protocol: MCP JSON-RPC 2.0 (HTTP transport)
Auth: None — free, public, read-only
Docs: ladu.co/mcp-server


Quick start

Add to your MCP client config (Claude Desktop, Cursor, Cline, etc.):

{
  "mcpServers": {
    "ladu": {
      "url": "https://www.ladu.co/mcp"
    }
  }
}

No API key. No signup. Restart your client and the tools are available.


Related MCP server: muni-dev-cost

Tools

Tool

What it does

check_buildability

Buildability verdict for any LA County address — zoning, overlays (hillside, coastal, fire, flood, historic, fault), ADU rules, nearby permit count

lookup_parcel_rules

Full regulatory detail for a parcel: zoning, lot size, all applicable overlays, governing jurisdiction's ADU rules

get_adu_rules

Structured ADU rules for any of 51 supported cities: setbacks, max size, height, parking, permit fees, timeline

compare_jurisdictions

Side-by-side rule comparison for two cities

estimate_adu_cost

Cost range + timeline for a given city, square footage, ADU type, and finish level

get_adu_permit_counts

Total permits, most-recent-year count, YoY change, and median valuation for a city

get_adu_permit_trends

Year-by-year permit counts and median valuations (2018–present) for a city

get_adu_permit_valuations

25th/50th/75th percentile of declared permit valuations by city and optional year

find_nearby_adus

Permitted ADUs near an address within a radius (default 2 miles)

list_cities

All 51 supported LA-area cities with slugs, display names, and governing municipality


Example questions

Once connected, ask your AI assistant:

  • "Can I build an ADU at 1234 Main St, Los Angeles?"

  • "What are the ADU rules in Santa Monica vs. Pasadena?"

  • "How much would a 600 sq ft detached ADU cost in Culver City?"

  • "How many ADUs were permitted in LA County in 2024, and what's the trend?"

  • "Are people building ADUs near 456 Oak Ave, Pasadena?"


Data

  • Permit records: 19,000+ LA County ADU permits from public LA County Assessor and LA City/County Building & Safety records, deduplicated by case number, covering 2018–present

  • Parcel data: ~2.4M LA County parcels with zoning, overlays, and regulatory facts

  • City rules: Structured regulations for 51 LA-area jurisdictions

Methodology: stats.ladu.co/methodology


Privacy

The server returns property characteristics, zoning, regulations, and aggregate permit statistics. It never returns owner names, contact information, financial details, or mortgage data. It runs against a least-privilege read-only database role — private information is not reachable at the database level.


Rate limiting

Tool calls are rate-limited per client. The server returns HTTP 429 with a Retry-After header and a JSON-RPC -32000 error when the limit is reached.


Built by LADU — Los Angeles ADU specialists.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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