UK environmental data infrastructure.

We build products and APIs for flood risk, planning policy, hydrology, and geospatial data. Used by engineers, planners, insurers, and AI agents.

Our productsAPI Platform
The platform

Data infrastructure powering environmental decisions across the UK.

From individual site assessments to portfolio-wide flood screening, Wrench processes environmental data queries for engineers, planners, and AI agents.

76

Data connectors across flood, ecology, heritage, ground, planning, and terrain.

6

APIs covering geospatial data, policy, hydrology, and flood modelling.

Products

Specialist software for environmental risk

Three products for the people who assess, model, and manage flood risk, planning policy, and hydrology in the UK. Each one is built on the same APIs we sell.

Planning Intelligence

PreApp.io

Instant planning constraint screening for any UK site. 76 datasets, planning policy analysis, and constraint reports in seconds.

  • Automated flood, ecology, heritage screening
  • NPPF policy analysis with cited answers
  • Planning application monitoring
Learn more

Flood Hydrology

Hydrometric

Full hydrological computation in the browser. FEH Statistical, ReFH2, DDF rainfall, SCS method, and climate change allowances. Replaces WINFAP.

  • FEH statistical with pooling groups
  • ReFH2 design hydrographs
  • 462 tests, 13 computation packages
Learn more

Flood Modelling

floodrisk.online

Building-level flood risk assessment. Cellular automata flood models on 1m LiDAR terrain. Pluvial and fluvial scenarios. Results in minutes.

  • Pluvial and fluvial modelling
  • Property-level depth and hazard
  • Multiple return period scenarios
Coming soon
API Platform

Six services, one gateway

Every Wrench product is built on the same APIs we sell. Authenticated, metered, and callable from any language, agent, or workflow.

wrench/deluge

76-connector geospatial data aggregator. Flood, ecology, heritage, ground, planning, terrain.

POST /v1/deluge/intersections

wrench/lex

Planning policy RAG. NPPF, PPG, local plans, applications. Semantic search and cited answers.

POST /v1/lex/search

wrench/hydrofaucet

Flood return period estimates, DDF rainfall, design hydrographs. FEH statistical methods.

GET /v1/hydrofaucet/estimate

wrench/hydrometric

FEH statistical, ReFH2, DDF, SCS, climate allowances. Full computation as a service.

POST /v1/hydrometric/analyse

wrench/jormungandr

Cellular automata flood model. Pluvial and fluvial. LiDAR terrain. Multiple compute backends.

POST /v1/jormungandr/flood/screen

wrench/geolift

DEM extraction via WCS. Catchment delineation. Elevation at any resolution.

GET /v1/geolift/elevation
quickstart.ts
import { WrenchClient } from "@wrench/sdk"

const wrench = new WrenchClient({
  apiKey: "wrench_..."
})

// Constraints for a London site
const data = await wrench.queryIntersections({
  point: [-0.1278, 51.5074],
  groups: ["flood_and_water"]
})

// Flood hydrology
const flows = await wrench.estimateFloodFlows({
  lat: 51.5074, lng: -0.1278
})
Agent Integration

MCP tools for Claude

Every API is callable as an MCP tool. Add Wrench to Claude Desktop and query UK environmental data conversationally.

claude_desktop_config.json
{
  "mcpServers": {
    "wrench": {
      "command": "npx",
      "args": ["@wrench/mcp"],
      "env": {
        "WRENCH_API_KEY": "wrench_..."
      }
    }
  }
}
query_uk_constraints
76 datasets of flood, ecology, heritage, planning data
search_planning_policy
Semantic search across NPPF, PPG, local plans
answer_planning_question
RAG-powered cited answers from policy docs
estimate_flood_flows
FEH statistical flood return period estimates
get_ddf_rainfall
Depth-duration-frequency rainfall data
compare_nppf_versions
Track policy changes between NPPF versions
assess_flood_risk
Automated flood risk policy assessment
flood_screen
Quick CA flood model screen

API pricing that scales with you.

Free

£0

For evaluation and prototyping

  • 100 queries per month

  • 10 requests per minute

  • All 6 APIs

  • Community support

Get started
Most popular

Starter

£49/mo

For teams building on Wrench APIs

  • 1,000 queries per month

  • 60 requests per minute

  • All 6 APIs

  • Email support

  • Usage dashboard

Subscribe

Pro

£199/mo

For production workloads

  • 10,000 queries per month

  • 120 requests per minute

  • All 6 APIs

  • Priority support

  • Webhooks

  • Usage dashboard

Subscribe

Start building with UK environmental data.

Get an API key, install the SDK, and query flood risk, planning policy, and hydrology data in minutes.

Get API KeyRead the docs