Door

[Cynder loves Portal]

I usually use the player spawn model as reference for door height.

Is that right or I should add on a bit extra?

 

[I dinne ken]

128 is usually fine for small entrances. Anything over that is good for larger ones.

That's TF2's scaling, other source games are typically shorter.

 

[Bull]

You can also grab some of the doorframe props and place them as prop_static to get some reference as for what Valve uses