Awesome ASCII skillz...

Detached
Code:
   ---------
/ \
/ \
/ \
| |
| House 1 |
| |
| |
---------------



Semi-detached
Code:
   -------------------------
/ | \
/ | \
/ | \
| | |
| House 1 | House 2 |
| | |
| | |
-------------------------------



Terrace
Code:
   -----------------------------------------------------
/ | | | \
/ | | | \
/ | | | \
| | | | |
| House 1 | House 2 | House 3 | House 4 |
| | | | |
| | | | |
-----------------------------------------------------------