Property tools.
No signup required.
Calculators and interactive maps for property investors, developers, and agents. Built on the same data that powers the Homedata API.
Calculators
Instant answers to the numbers that matter most in any property deal.
Stamp Duty Calculator
SDLT for any UK purchase. Updated for April 2025 thresholds. Covers FTB, home movers, additional properties, and non-residents.
GDV Calculator
Gross development value, profit on cost, and profit on GDV for any residential scheme. Land cost, build cost, and professional fees.
Mortgage Calculator
Monthly repayments with full amortisation schedule. Repayment and interest-only modes. Capital vs. interest breakdown chart.
Rental Yield Calculator
Gross and net yield with full cost breakdown — agent fees, maintenance, insurance, void periods, and mortgage interest.
Interactive Maps
Explore property data geographically. Powered by live Homedata API data on Mapbox.
Property Explorer
Search any UK address and explore nearby properties on an interactive map. Satellite and street view modes. 36 million properties.
Live Listings Map
Browse live for-sale and rental listings on a map. Filter by postcode, property type, and bedrooms. Colour-coded by sale/rental/STC status.
Planning Applications Map
Every planning application plotted on a map. Filter by status, type, and date. Data from 417 local planning authorities across England and Wales.
Build your own tools
These tools run on the same Homedata API available to developers. Embed property data directly into your platform — mortgage calculators pre-filled from address lookups, yield tools powered by live price data, risk assessments from your own UI.
Comparables
20 recent sold/let prices near any UPRN for AVM and yield benchmarking
Price Trends
30 years of median prices by outcode — monthly granularity, volatility score
Address Retrieve
Full property record from a UPRN — EPC, bedrooms, floor area, predicted price
Learn from the blog
Practical guides that go deeper than the calculators.
How to Calculate Property Development Feasibility
GDV, profit on cost, and residual land value — with Python code to pull market comps from the API.
InvestorsBuild a Rental Yield Calculator with Live UK Property Data
Gross and net yield calculation using real comparables and price trends from the API.
DataCouncil Tax Bands API: VOA Data for Every UK Property
Look up council tax bands by UPRN or postcode. Practical patterns for proptech platforms.