How can I take down walls/doors that I made?

I made an 1x1 shack first, but now i have a 4x4 shack and I want to take down the wall + door. How can I do this?

[editline]28th September 2013[/editline]

Sorry, but I really need to know this. Also, how can I see wall health?

Repair it putting wood in your 3 spot on your hot bar and looking at the wall. Then push 3. This will repair the wall some and tell you how much hp is left.

Thanks.

you can blow it away with c4 and the dorr can be chopped away i think but not wall.

Walls can ONLY be damaged by explosive charge.