Cities: Skylines

Cities: Skylines

1,865 ratings
Building Themes (Green Cities)
File Size
0.561 MB
Jun 21, 2015 @ 11:20am
Oct 20, 2017 @ 10:43am
36 Change Notes ( view )

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Building Themes (Green Cities)

This mod makes possible to apply building themes to a district or the whole city. Only buildings which are contained in one of the selected themes will grow in a district. You can subscribe to theme mods from the workshop, or create your own themes in the game.


This mod is not compatible with:

What This Mod Does
  • Adds 'Themes' tab to districts policies panel where you can select a theme for a district or the whole city. The mod unlocks the panel from the start.
  • Adds Building Theme Manager (accessible from the 'Themes' tab) where you can edit existing themes and create your own themes
  • Provides two built-in themes, 'European' and 'International'
  • Improves the building footprint selection (important for themes with only small buildings)

Use 'Themes' tab to enable or disable district's themes. You can specify any number of active themes. If no theme is active for a district it will mean that any growable is allowed.

By default no theme will be activated. Make sure that the "European" style is enabled in the content manager styles section.

By default, districts will use the city-wide theme setting. You can check the 'Enable Theme Managament for this district' checkbox to control the theme setting for a district separately

If you redraw district's borders the buildings not belonging to district's theme won't disappear. When it's time for them to upgrade they will level up to a building that is allowed in the district.

If you want to allow custom workshop assets in a district, you can either add them with the Theme Manager (see below) or check the 'Allow buildings which are not in any theme' checkbox.

What This Mod Doesn't Do
  • It won't corrupt your save games if you disable it (though cloned buildings will disappear)
  • It doesn't unlock European growables for non-European biomes or vice versa. Enable the European building style in the content manager to do that.

How To Add Custom Themes And Modify The Built In Themes: Theme Manager

You can open the Theme Manager in the 'Themes' tab.

On the left is the list of themes. Select a theme and add and remove buildings. There is a live preview (which can be rotated) on the right!

Click on a building in the list to select it. There are 2 advanced options which can be controlled:
The spawn rate controls the chance that a building appears. Note that it only works when you add multiple buildings with the same zone type, level and footprint size.
The upgrade building can be set if you want the building to upgrade to a specific building (like the same building model with a pool and solar panels).

It is important to understand how the simulation works:

When you create a new empty zone, a level 1 building will spawn first (so you have to include one in your theme). This building will upgrade to a level 2 building when certain requirements are met. The level 2 building needs to have the same width, and a length which is equal or smaller. Example: L1 2x3 low-density residential will upgrade to: L2 2x3 or L2 2x2 or L2 2x1 low-density residential.

If there is enough space, the game will expand the front- or backyard of a building to a maximum length of 4 cells (e.g. a 2x2 building will spawn as 2x4). This mod changes the behavior a little bit, which can be used by asset creators: If there are no props or trees in the expanded backyard, the size will be set back to the original size. That way it is possible to create neighbourhoods with only 4 cells wide blocks. The UK Terraced Housing theme uses this feature.

Asset Cloning

The Theme Manager also allows you to clone buildings and assign different levels to them. This can be used if you don't have enough buildings for all wealth levels, or if you just want more variety by assigning all buildings to all levels. To clone a building, select it in the list and press the 'Clone Building' button in the bottom right. Enter a name to identify your clone in the building list and select the wealth level. The clone will appear in the building list.

Important: Clones will be created during the level loading process. You have to go back to the main menu and reload your save to generate the clones.

Important: When you delete the theme that contains clones, these buildings will disappear when you load your city the next time! The same happens when you disable the mod, or when the mod fails to load. But: Your save files are not broken.

The cloning feature can be disabled completely in the mod settings.

How To Add Custom Themes: Theme Mods

We created some "Theme Mods" which automatically add new themes. These mods do not include the required building models! Subscribe to the Building Collection that is mentioned in the mod description! You will find the new themes in the 'Themes' policy tab.

Building Theme: UK Terraced Housing

Adds a British row houses building theme. Don't forget to upvote rik4000's creations! Without his excellent work, this theme would not have been possible!

► Required Building Collection
► Theme Mod
Building Theme: American Trailer Homes

Adds an American low-density homes building theme. Don't forget to upvote DethKwok's creations! Without his excellent work, this theme would not have been possible!

► Required Building Collection
► Theme Mod

How the mod saves your data
  • Custom Building Themes and options are stored in an XML file ({Steam folder}\steamapps\common\Cities_Skylines\BuildingThemes.xml)
  • District theme assignment data is saved in the game save.

You do not have to edit these files! Everything can be configured in the game.

Upcoming Features
  • Theme sharing option: Upload your theme to the workshop with two clicks
  • More cloning options: Change the zone type, color variation or density of a building
  • A better 'No High Rises' policy which checks the building height

Feel free to comment. If you have any errors/exceptions please don't paste them or output_log to comments. Use pastebin or similar tool.

Source Code[]

Using the C# detours code[] created by Sebastian Schöner, released under the MIT license.
Popular Discussions View All (16)
Nov 14 @ 1:53pm
PINNED: Not working? Post your bug reports here!
Nov 2 @ 12:23pm
PINNED: Post your ideas for custom Building Themes!
May 31 @ 8:59am
Suggestion: Enable spawning buildings from levels >1
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boformer  [author] 5 hours ago 
@WTC You probably messed up the themes. To reset the themes, delete the file {Steam folder}\steamapps\common\Cities_Skylines\BuildingThemes.xml.

That will also delete themes you made.
WTC1973 22 hours ago 
Yeah, something's wrong with this mod for me... themes are off, two of the themes (vanilla and European) aren't there and when I go to turn them on and see the buildings I've selected, it's just blank. It may be a mod conflict, but, I just... I-I don't know.
boformer  [author] Nov 17 @ 2:58am 
maybe one of the other mods you are using breaks the save mechanism.
Rewtkid Nov 16 @ 2:15pm 
Does anybody know why it keeps shutting off and I have to keep reenabling it in the policy manager.
tired-broad-53 Nov 15 @ 10:07am 
I just wanted to take a moment to personally say “Thank You!” for your time, effort and hard work to provide this mod. It enhances my gaming experience, and I do so appreciate you for providing this to all of us.
boformer  [author] Nov 15 @ 7:01am 
@Retkid To enable the euro theme on international maps, enable the "Euro/Vanilla" building style in content manager.
Rewtkid Nov 14 @ 5:12pm 
I had to enable international or european. I guess you need one or the other. No idea on that array index out of range?
Rewtkid Nov 14 @ 5:06pm 
I have a question what if I dont like the brown high residential eurapeon vanilla do i have to use it? I am trying to disable it but high dense res wont build i think i am confused.
boformer  [author] Nov 14 @ 3:48pm 
I just tested the mod. It seems like no update is necessary.

If you have problems, please test the mod in isolation. Most of the time the problems are caused by conflicts with other mods, and I'm not able to provide support for that.
Rewtkid Nov 14 @ 1:51pm 
Nope that array index out of range error keeps popping up on load. I really like this mod so i just close the error twice but its annoying please fix. out put log. Simulation error: Array index is out of range.
at BuildingThemes.Detour.ZoneBlockDetour.SimulationStep (.ZoneBlock& zoneBlock, UInt16 blockID) [0x00000] in <filename unknown>:0
at ZoneManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at ZoneManager.ISimulationManager.SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManager.SimulationStep () [0x00000] in <filename unknown>:0
at SimulationManager.SimulationThread () [0x00000] in <filename unknown>:0 [Core]