I built a small one level house and nav meshed it, following the instructions on the Beth Nav Mesh tut video exactly. Seemed to work out perfectly, but my companion doesn't follow me through the door into the house and I can't figure out why, the whole floor is nav meshed. But he just stays outside when I enter the house.

Anyone got any ideas as to why? Perhaps I missed something needed for companions to enter an interior with you?

Here is a http://i110.photobucket.com/albums/n99/Shezrie/nav.jpg.

Looking at the pic, I do need to neaten it up a bit more, but of course that doesn't explain the companion problem.

You need to have a blue triangle in front of the door in order for NPC's to enter.

So just move the edge nearest the door to sit right along it's edge, re finalise and if a triangle turns blue you're sorted.

Solved! Thanks so much for the help!

No worries.

Looking at the picture again you might have issues with NPC's using the chairs & beds.
I'd change the nav-mesh so that it's under the blue furniture markers just to be safe.

You can do that, but you'll have NPC's trying to walk through the furniture more than they already do. I think they will use the chairs in the middle just fine, but you might want to drag the verts around the beds up a little closer to the bed.