1. What This Page Covers
This page explains exactly where our housing data comes from, how we calculate default home prices and rent levels, how often we update it, and why data accuracy varies between countries and cities.
Our goal is full transparency so you understand the strengths and limitations of our rent-vs-buy model.
2. Our Data Sources (Global)
We collect and aggregate data from a combination of official, public, and licensed sources.
Primary Data Sources
- Government statistics (census bureaus, property registries, tax authorities)
- National real estate databases and official transaction records
- Large property portals (median sale prices & rental prices)
- Financial institutions (typical mortgage rates, lending conditions)
Examples of Trusted Sources:
- 🇬🇧 UK: ONS, HM Land Registry
- 🇫🇷 France: INSEE, Notaires de France
- 🇩🇪 Germany: Destatis, Gutachterausschuss reports
- 🇺🇸 US/Canada: Municipal open data portals & aggregated listing data
Secondary / Modeled Data
For cities lacking direct data, we estimate using regional averages, comparable cities, and distance-weighted interpolation. Estimates may differ from real local prices by 10–20%, especially in smaller markets.
3. How We Calculate Default Values
The calculator pre-loads each city with typical home prices, monthly rent, and local transaction costs.
- City-Level Defaults: If direct market data exists, we prioritize it.
- Estimated Defaults: If direct data is missing, we use regional models.
Note: All values can be manually adjusted by the user.
4. Country-Specific Cost Assumptions
Housing costs vary significantly across countries. Below are baseline international assumptions used when generating default values:
| Country | Transaction Costs | Recurring Charges | Tenant Broker Fee |
|---|---|---|---|
| 🇺🇸 United States | ~3–5% | Property Tax | 0 months |
| 🇫🇷 France | ~7–8% (Notaire) | Taxe foncière | ~1 month |
| 🇩🇪 Germany | ~10–12% | Low annual tax | 1–2 months |
| 🇬🇧 UK | Stamp Duty | Council Tax | 0 months |
| 🇨🇦 Canada | Land Transfer + Fees | Property Tax | 0 months |
| 🇦🇺 Australia | State Stamp Duty | Council Rates | 0 months |
5. Updates & Accuracy
Update Schedule
- Home Prices: Monthly
- Rental Prices: Monthly
- Mortgage Rates: Quarterly
- Country Defaults: Annually
Known Limitations
- Data reflects city medians, not specific streets.
- Small cities may deviate more than metros.
- Local incentives may not be included.
6. How to Verify or Refine the Data
For the most accurate results, we recommend replacing our estimates with your own research:
- Check your country’s public sales registry for recent transactions.
- Browse local real estate platforms (Rightmove, Zillow, ImmoScout24, etc.).
- Get actual mortgage quotes from local lenders.
- Consult local tax authority websites for precise rates.
7. Report an Issue
If you find outdated or inaccurate data, please contact us with the city name and a link to a credible local source. We review all submissions and update when verified.
Disclaimer
This tool provides general financial modeling only. It does not constitute financial, tax, or legal advice. Consult local professionals before making major financial decisions.