How to create custom scaffold templates in ASP.NET MVC5?

First, it looks like you have Visual Studio 2013 and 2012 both installed on your computer. I tried looking up the path you provided, I couldn't find it. On your path it looks like you're try to use MVC4 templates. Here is my path:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\
Common7\IDE\Extensions\Microsoft\Web\Mvc\Scaffolding\Templates

Below is how I customized my scaffold template for the BaseController:

1)Create folder call "CodeTemplate" directly in the project folder.

2)Go to below path, find MvcControllerWithActions folder copy all to folder "CodeTemplates"

   C:\Program Files (x86)\Microsoft Visual Studio 12.0\
    Common7\IDE\Extensions\Microsoft\Web\Mvc\Scaffolding\Templates

3)Go to CodeTemplates -> MvcControllerWithActions in your project.

4)There are two files, Controller.cs.t4 and Controller.vb.t4 in MvcControllerWithActions, if you used C#, delete Controller.vb.t4.

5)Open the Controller.cs.t4 file, modify the Controller name to BaseController, like below:

 public class <#= ControllerName #> : BaseController
    {
    }

6) Now, when you try to create MVC5 Controller using "add new scaffold item", it'll use the template you customized.

Hope it helps.