| Value | Category |
|---|---|
| 1 | Cement bonded bricks / stones |
| 2 | Cement, stones and mud |
| 3 | Mud bonded bricks / stones |
| 4 | Wood / branches |
| 5 | Concrete |
| 6 | Unbacked bricks |
| 7 | No outside wall |
| 8 | Other (specify) |
| 777 | Respondent does not want to respond |
| 888 | Not applicable |
| 999 | Don't know |