Version 1.5

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Prison Architect Update 5 has been released. Steam users will be automatically updated. Non-steam users can download the latest version from the builds page here:

You need an active forum account to access the builds from our website. If you haven’t already done so, please register your game here to gain access to the builds, the private forums, the bug database and the wiki.

Here is our video demonstrating the new features:

Performance optimisations[edit]

We focussed on performance this month, and achieved a speed boost of at least 50%. This work is ongoing.

  • Now defaulting to the VS2015 build, with the old VS2008 build still available for Safe mode (Prison Architect Safe Mode.exe). This gives a good speed improvement over the VS2008 version.
  • Asynchronous job search system. Instead of synchronously looking for a job, workers, guards, prisoners, doctors now place a request for a new job in a queue. This queue is processed during render phase of the game loop so shouldn't take up any time during the main game loop.
  • Speed up rendering of the Feed Prisoners Objective. This was particularly slow when there were a lot of hungry prisoners.
  • Rebuild the indoor/outdoor shadow mask only when a cell changes its material or indoor/outdoor status.

Thermodynamics (continued)[edit]

These operate on a seperate layer to the existing pipes, and can be overlaid without conflict.
Requires a large pipe connection of cold water, and a direct electrical connection.
You can run hot water pipes from this boiler in any direction.
Nb. Water will lose heat the further it gets from the boiler.
  • All radiators now require a hot water connection to function
  • Showers can take cold water or hot water.
When supplied with hot water, showers will also reduce a prisoner's Warmth need
When supplied only with cold water will apply a Frigid effect, which acts as a kind of short-term surpression while also spiking their Warmth and comfort needs.

3D mode has been discovered[edit]

This update we have improved 3D Mode with new shapes, new shaders operating on all objects, and better wall geometry. 3D mode remains very experimental.

  • Known bug: The mouse position is wrong when using graphics/Supersampling.
  • Known bug: Long pauses caused by geometry changing, eg wall construction/demolition


  • Thermodynamic map to use 16 bit number type to represent the temperature instead of 8 bit. This fixes a bug with fire showing negative temperatures.
  • 0010610: [Graphics] entire screen is black and white boxes