io.github.chrischall/hemnet-mcp

Hemnet MCP

An MCP server for hemnet.se, Sweden's largest real-estate portal. Search for-sale listings, look up sold prices (slutpriser), pull full listing detail and photos, compute market statistics, resolve addresses, and run a Swedish mortgage calculation — all from Claude.

⚠️ This project is built and maintained by AI (Claude). It reads hemnet.se through its public GraphQL API. Use at your own discretion and within hemnet.se's terms of service.

Highlights

• No configuration. Hemnet serves its read queries anonymously — no login, no API key, no browser extension. npx hemnet-mcp just works.
• Sold prices (slutpriser). Hemnet's signature dataset: achieved final price, asking price, and over/under-asking percentage — the comps an agent needs to value a home.
• Swedish-native. Money in SEK, areas in m², rooms, bostadsrätt fees (avgift), energy class, and a mortgage model that follows Swedish rules (amorteringskrav, ränteavdrag).
• Embeddable. Ships as a standalone MCP server and as a library so it can be composed into a larger multi-portal server.

Install

Claude Code / Claude Desktop (npx)

{
  "mcpServers": {
    "hemnet": {
      "command": "npx",
      "args": ["-y", "hemnet-mcp"]
    }
  }
}

From source

git clone https://github.com/chrischall/hemnet-mcp
cd hemnet-mcp
npm install
npm run build
node dist/index.js

Tools

Tool	What it does
hemnet_autocomplete_location	Resolve a place name ("Vasastan") to Hemnet location ids — the starting point for search.
hemnet_search_listings	Search active for-sale listings by location + filters (price SEK, rooms, m², property type, keywords).
hemnet_get_listing	Full detail for one listing (price, fee, running costs, m², rooms, tenure, energy class, broker, description, photos).
hemnet_get_listing_photos	Just the gallery photo URLs.
hemnet_search_sold	Search sold listings with final price, asking price, and over/under-asking %.
hemnet_get_sold_listing	Full detail for one sold listing.
hemnet_get_market_stats	Median/average final price and price-per-m² for a location.
hemnet_compare_listings	Fetch several listings at once for side-by-side comparison.
hemnet_get_by_address	Resolve a free-text street address to a live listing.
hemnet_calculate_mortgage	Local Swedish monthly-cost calculator (interest + amortisation + fee, gross & after-tax). No network.
hemnet_healthcheck	Verify the Hemnet GraphQL endpoint is reachable. Reports which transport served the probe (transport: direct fetch or the browser bridge, plus the configured HEMNET_TRANSPORT), the bridge's role/port/extension-link state (bridge, once a bridge exists), a classified error.kind (e.g. cloudflare_challenge, session_not_ready) and a next-step hint.

Example flow

1. hemnet_autocomplete_location { query: "Vasastan" }
   → location_id 925970
2. hemnet_search_listings { location_ids: ["925970"], rooms_min: 2, price_max: 6000000 }
   → listing summaries
3. hemnet_get_market_stats { location_ids: ["925970"], housing_form_groups: ["APARTMENTS"] }
   → median final price, price-per-m²
4. hemnet_calculate_mortgage { price: 4695000, interest_rate: 3.9, monthly_fee: 2800 }
   → monthly cost, gross and after-tax

Or pass a free-text location to any search tool and it resolves the top hit for you.

Money & units

All output records use numbers: price / final_price / fee_monthly in SEK, living_area_sqm / land_area_sqm in m², rooms as a number. A derived price_per_sqm is always included when price and living area allow it (even when Hemnet omits it, common on houses). The original Hemnet-formatted strings are kept alongside as *_formatted.

Library use

hemnet-mcp is also importable, so it can serve as a Hemnet portal source inside a larger project (e.g. a cross-portal realty orchestrator):

import { createHemnetClient, computeMarketStats } from 'hemnet-mcp';

const hemnet = createHemnetClient();
const { cards } = await hemnet.searchSales({ locationIds: ['925970'] }, { limit: 50 });
const stats = computeMarketStats(cards.map(formatSaleCard));

The library entry (import … from 'hemnet-mcp') re-exports the client, the normalised record types, the pure derivations (computeMarketStats, calculateSwedishMortgage, money/url helpers), and every tool registrar (registerHemnetTools(server, client) to graft the tools onto your own MCP server).

Development

npm test               # vitest (mocked transport, no network)
npm run test:coverage  # 100% coverage enforced on src/**
npm run typecheck
npm run build

Tests drive every tool and the client through an in-memory fake transport — no live hemnet.se calls. See CLAUDE.md for architecture, the GraphQL quirks, and contribution conventions.

License

MIT