Anywhere in Britain and Ireland.

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The brown polygons on the map indicate areas that are currently being used for housing.

The green polygons indicates areas currently being used for golf courses.

Click on the or icons on the map to select an area.

The Golfulator calculates the area of the selected region being used for each purpose.

Click on the buttons to jump to different cities.
Golfulating

Click the square at the top-left of the map to get started.
Location lookup by locationiq.
(This works for Britain and Ireland).
Documentation and methods and raw data are on The GitHub repo.
Housing and golf-course polygons are extracted from OpenStreetMap and are the copyright of the OSM contributors.
Missing residential land or golf courses can be corrected on open street map by anyone and will be reflected on this tool later.
The Map API is hosted on a free-tier server on Azure. I wrote the server myself, the code is awful. If this site gets popular it will go down.