Make the roof level the current view.
Revit add dormer roof.
After adding a dormer cut an opening for it through the roof.
Create the walls and roof elements that make up the dormer.
You can model this in any of the 3 primary roof modelling methods but in the example i have opted to use the roof by extrusion tool.
Use the join roof tool to join the dormer roof to the primary roof.
Draw three walls.
First a work plane needs to be decided upon.
Do not use the join geometry roof tool for this task or you may.
Use the join roof tool to join the dormer roof to the primary roof.
Create the walls and roof elements that make up the dormer.
To create a dormer roof we first need to start with the smaller roof portion of the dormer.
Open a plan view or an elevation view in which you can see the.
This tutorial explains the process to create a gable dormer in revit.
In any elevation view add a new level that represents the top of the dormer walls and the level where you will draw.
Revit building helps you create dormer roofs including the dormer geometry required by the opening in the main roof.