Finnish housing and property data right in Claude and ChatGPT.
Your AI finds answers in official sources instead of guessing: prices and rents by postcode, a housing company's trade register status, building permits, protection and flood risk, population trends and housing decisions of the Consumer Disputes Board. 23 datasets from 8 authorities in the same conversation.
Works in Claude and ChatGPT. Without a subscription you get 3 questions a week.
Who it's for
Write a sales brochure from an analysis of the housing company's documents, and answer buyers' questions with official figures. The agent can also see your own housing company analyses, if you have analysed the documents in the service.
Rent levels and how they're changing, rent increases on the official index, cash flow with interest-rate scenarios, and who is responsible for which maintenance.
Screen areas by yield and trend, check a whole portfolio at once, and pull long time series into your own models.
Every answer shows its source, area level and period.
What is an MCP connection, and why use one?
An ordinary AI chat looks for housing information on the open web: in listings, news and discussion forums. A figure it finds may be years old, refer to a different area or be made up altogether, even if it sounds convincing. It can't reliably check postcode-level rents or pending building permits, for example.
MCP (Model Context Protocol) is the way an AI app uses an external data source. Once Asunto-Osake Tulkki is connected, the AI pulls figures straight from our database instead of guessing. The data comes from official sources such as Statistics Finland, the Finnish Tax Administration, SYKE and the Finnish Heritage Agency, and it is updated and checked regularly. Every answer tells you where the figure comes from and whether it is measured or estimated. If the data doesn't exist, the answer says so.
What an answer looks like
Every answer states its source and its limits, so you know which figures you can rely on. (These examples are English renderings of real answers given in Finnish.)
Is Käpylä Church protected?
Yes, on two separate grounds. The building is individually protected under the Church Act: protection typically extends to the interior too, and repairs need the approval of the parish and the Finnish Heritage Agency, not just a building permit. The building also lies in the RKY area called Käpylän puutaloalueet ja Käärmetalo (a nationally significant built cultural environment), which separately restricts changes to the façade and streetscape. Note: this source doesn't cover protection markings in the local detailed plan (the sr marking), which is the most common form of protection for an ordinary flat in a block. Check that with the municipality separately.
get_protection_status · Finnish Heritage Agency built heritage register, CC BY 4.0
What is the rent level for two-room flats in central Helsinki (00100)?
The model estimate is €23.36/m² per month (room type: two-room flats). It is based on a postcode-level anchor rent, adjusted with the rent index for the Helsinki 1 sub-area from the anchor quarter (2025Q4) to the present (2026Q2). The change has been only +0.1%. Reliability class: stable, meaning the estimate passed the stability check.
get_rent_level · Statistics Finland rent statistics
What new housing is coming to Härmälä-Rantaperkiö in Tampere (33900)?
There are 16 new residential building projects under way in the area: 15 blocks of flats and one small house, 440 new homes in total. The figure only covers new-build permits granted in the last three years that are still active, not renovations or other alterations to existing buildings, so it describes specifically the new supply coming to the area.
get_construction_pipeline · Ryhti (SYKE) avoimet_lupa_rakennukset
A rent of €850/month is tied to the cost-of-living index, base index January 2024, minimum increase 3%. What is the new rent? Two-room flat, 50 m², Tampere (33100).
The new rent is €875.50/month, €25.50 more than now. The cost-of-living index was 2,322 points in January 2024 and 2,385 in August 2026, a rise of 2.71%. On the index alone the rent would be €873.06, so the lease's 3% minimum increase applies. Market comparison: the new rent is €17.51/m² per month against an estimated area rent of €14.79/m² per month (estimate, 2026Q2), 18.4% above the estimate. Half of the total rents for privately financed two-room flats in Tampere are between €695 and €857 (median €779), so the new rent is above that range. This is a position in the distribution, not a judgement on whether the rent is reasonable. The calculation only holds if the index, the base index month and the minimum increase are the lease's own terms.
calculate_rent_increase · Statistics Finland, cost-of-living index (11xl) and rent statistics (15fc)
Which postcode areas in Oulu have the best gross yield for two-room flats?
19 of Oulu's 46 postcode areas made the ranking. The top three: Rajakylä (90580) 14.29% (price €918/m², 14 sales in 2025; rent €10.93/m² per month, 63 leases 2025Q4), Pyykösjärvi-Puolivälikangas (90550) 12.20% (€1,191/m², 47 sales; €12.11/m² per month, 90 leases) and Koskela-Oulu (90560) 11.42% (€1,106/m², 42 sales; €10.53/m² per month, 48 leases). Gross yield is the rent times 12 divided by the price, before any costs, so the maintenance charge, tax and empty months are not included. Rajakylä's figure rests on only 14 sales, so it is sensitive to individual transactions. The other 27 areas were left out of the ranking because the price or rent is missing, or is based on fewer than 10 sales or leases.
screen_areas · Statistics Finland, prices (13mu) and rents (13eb)
What the AI agent sees
Claude and ChatGPT show 19 tool names. Behind them are 23 datasets from 8 authorities and public bodies, and the AI combines them into one answer. The full list is below.
Prices and sales
Rents
Population and area
Housing company, costs and financing
Buildings and risks
Leases, law and decisions
Every figure travels with its source, area level and period, and missing data is stated plainly.
- Unlimited use of the MCP tools
- All 23 datasets above
- The same account in Claude and ChatGPT
- Cancel any time
Need a deeper analysis of the housing company's own documents? Explore the main app →
Connect once, ask whenever you like
Add Asunto-Osake Tulkki as a custom connection in Claude or ChatGPT, using the address below.
Sign in with your Asunto-Osake Tulkki account and approve the connection. No separate pairing code is needed.
Ask about an address, a postcode or a property: the tools fetch the answer with its source and reliability, and your AI replies in your language.
https://mcp.asunto-osaketulkki.fi/mcpClaude.ai or the Claude desktop app.
- 1Open Settings → Connectors and choose Add custom connector.
- 2Paste the MCP address, name it Asunto-Osake Tulkki and choose Add. Then choose Connect.
- 3Sign in with your Asunto-Osake Tulkki account and approve the connection. You'll return to Claude automatically.
You can allow the read-only tools permanently in Claude's settings.
Requires a Plus, Pro or Business plan. Works in the browser at chatgpt.com.
- 1Open Settings and turn on Developer mode. It's usually under Apps or Plugins.
- 2Create a new connection (Create or Add MCP server), paste the MCP address and choose OAuth as the authentication method.
- 3Sign in with your Asunto-Osake Tulkki account and approve the connection. Then pick the connection from the tools menu in a chat.
Claude and ChatGPT fetch the tool list when you connect and remember it. New data and refinements show up straight away, but a new tool only becomes available once you refresh the list. In Claude: Settings → Connectors → open Asunto-Osake Tulkki → the three-dot menu (⋮) in the top right corner → Refresh tools list. In ChatGPT: refresh the connection in the app settings. If there's no refresh option, disconnect and connect again. We announce new tools on the Updates page (in Finnish).
You sign in with the same account as on asunto-osaketulkki.fi. If you don't have an account yet, you can create one when you sign in. Without a subscription you get 3 questions a week, and unlimited use costs €9.90/month.
Connect your AI agent today.
Asunto-Osake Tulkki's property data is one question away.
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