# 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](https://www.ladu.co/mcp-server)

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## Quick start

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

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

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

---

## 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](https://stats.ladu.co/methodology)

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## 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.

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## 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.

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Built by [LADU](https://www.ladu.co) — Los Angeles ADU specialists.