DeleteWalls is a command that deletes all walls in the current file.
This project was built in Visual Studio 2019. Download it here.
This sample references Revit 2021's RevitAPI.dll and RevitAPIUI.dll.
Find RevitAPI.dll and RevitAPIUI.dll in your Revit 2021 install location and note its location.
Clone this repository and open DeleteWalls.sln in Visual Studio.
In the DeleteWalls C# project, repair the references RevitAPI and RevitAPIUI. You can do this by removing and re-adding the references, or by opening the DeleteWalls.csproj for edit and manually updating the reference paths.
Build DeleteWalls.sln in Release or Debug configuration.
Note: Although the project will be always migrated to latest release of Revit, it should be also working with previous releases (after re-built by the corresponding references & packages).
Find DeleteWalls.addin and place in the Revit Addins folder (C:\ProgramData\Autodesk\Revit\Addins\201*\ for Windows 7, 8, and 10).
Edit the .addin file and edit the <Assembly> value to point to the location of Autodesk.DeleteWalls.Command.dll.
Start up Revit and open a Revit file.
Under the Add-Ins ribbon tab, click the External Tools drop-down, then click DeleteWalls.