Create the dormer roof and join it to the main roof.
Revit roof dormer.
Use the join roof tool to join the dormer roof to the primary roof.
Move the walls to the dormer.
Create the roof opening and finish the dormer.
This video demonstrates the following.
Do not use the join geometry roof tool for this task or you may encounter an error when creating the dormer opening.
Select the wall type and constraints for a dormer that will be added to a roof.
To use this do the following.
Revit 2021 inclined rafter joining roof rafter to dormer rafter paul building and architectural design autodesk beam inclined micrographics revit 2021 roof rafter when a dormer roof joins the main roof the rafters are not in line.
After adding a dormer cut an opening for it through the roof.
Use the modify sub elements button to select your newly placed points.