solver

Select one of the good walls and using the same wall type handle, drag it over the problem walls.

Yes

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I started with your plan -- 2 story + attic. Yes if walls are not already there -- see the video. No, the program is smart enough to only build roofs over the highest room. Being able to automatically create walls when you build a new floor is just a bonus. What you are really doing is telling the program to set things up so you can draw on a new floor. It creates a virtual floor. Think of it like you are drawing on paper. You draw the first floor, then get another sheet and draw the 2nd, and another to draw the basement etc. Watch on YouTube: http://youtu.be/t71oVyTYB58?hd=1

Read what I said above -- you don't build a new floor -- you already have one. I'd also suggest using auto roofs and leaving auto rebuild foundation on.

You already have a 2nd floor. Just draw the walls you want above the addition and set the ceiling height in the room they form.

The simple answer is -- you have Pro, so use its manual roof tools to draw the roof you want. Or, attach the plan file (close Pro first) and say what the roof on the addition should look like and someone will take a look. I see a bunch of other issues with the windows. Is everything correct? Can't say without seeing the issue. You can always download the latest Pro trial and see for yourself.

Since this is a small and simple structure, and you have Pro, so why not use its manual roof tools. Getting a roof like this to auto build is possible as I show above, but much easier and far quicker with manual roof planes.

Auto built roof.

Auto Dormers cannot cross multiple roof planes. You need to form the dormer manually. Search the forum for dormer for some recent info/videos.

Control-Alt-S will start the spin. Any key press/mouse click will stop it. Control-Alt-S again spins in opposite direction. Open the camera and change the Incremental Rotate Angle to set the speed -- small angle like .5 for slow, higher numbers for faster.

Control-Alt-S will start the spin. Any keypress will stop it. Control-Alt-S again spins in opposite direction. Open the camera and change the Incremental Rotate Angle to set the speed -- small angle like .5 for slow, higher numbers for faster.

Watch on YouTube: http://youtu.be/hZDZwAWTFTY?hd=1

Couple of unrelated tips. Watch on YouTube: http://youtu.be/13roaJrFWps?hd=1

I don't think so. I looked in Pro 2019 Trial (the oldest I have installed) and the walls are correct. Without being able to see the problem first hand, I cannot offer suggestions on a fix. I'd sent this in to support and see what they say.

Watch on YouTube: http://youtu.be/W1_aLNPs0wo?hd=1

Here are a couple of suggestions. Consider flipping the master bath and closet so you can have windows in the bathroom. On the front, maybe jog the wall back just a bit so the stairwell is clearly distinguished. And an idea for the bath.

I don't see a problem.

You will need to attach the plan file -- close Pro first.

To get the overhang to behave, try this Looks like you have multiple pitches, so you will need to set some walls to override the default. For the center gable, try a Dormer, or the Gable/Roof Line tool.

Make that space a room (Room Divider) and lower its ceiling.

Just like a window -- use plan view. Center the ones below in 3D.

2019 and 2021 does. I don't have 2020 to check.

Plan Check

Make a thick wall, then use the Wall Niche tool.