The Conditions for Salaah

1- The clothes worn in salaah must be taahir (cleen).

2- The body of the musallee must be taahir.

3- The place of prayer must be taahir.

4- It should be the correct time for salaah.

5- The musallee must be face towards Qiblah.

6- Niyyah for salaah should be made.

7- The awrah must be properly covered.

source : Fiqhul Islam,Deeniyaat Book 3