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I have an object representing a room. I want to cut a door on it. I planed to use knife tool, because I do not know any better for this - any other (or "proper") idea would be good too BTW. I want to move X units from the corner on the bottom edge and make a cut from there (green dot) to the top. How can I do this?

room

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    $\begingroup$ I would simply use loop cut and position it about at the right place, then select the cut. After that, go to the right-hand-side panel in the 3D view. (Aka. Properties, hit N to open.) Scroll around (it's somewhere up, I don't exactly remember where). You should find three numeric inputs for the x, y and z of the selection. There you can enter the exact value you want. Pro tip: For any numeric input in blender, you can use basic mathemathical operators in them. $\endgroup$ – Mörkö Oct 7 '15 at 7:14
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Use the knife tool or loop cuts to build your mesh, and then here is a trick to move a vertex or edge to a precise position relative to the corner:

  1. select the vertex or edge you want to move
  2. move it all the way to the corner, validate
  3. move it back (for example with GX), enter the distance on the keyboard.

enter image description here

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There is no direct way, sadly, afaik. One different way is to cut anywhere on the edge, and then move the vertices where you need precisely (in your image, along the x axis). Or you could also just create a vertex in the middle of the edge (by subdividing) then move it on x axis and then cut with the knife tool using snapping, to that precisely positioned vertex.

Note, you can also position a vertex on the edge by using "vertex slide" SHIFTV, and see its precise position on the edge in the viewport activating, in the properies panel (press N) mesh display > edge info > length

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