Muhurth is fixed in 2 steps shown as 2 rules tables below.
- Find the days suitable in a month. Select the day. This is based on Month, Day, Nakshatra, Tithi, Yoga, and Karana.
- Find the time of the event. This is based on the horoscope of that moment. What is rising ? What is setting or going to set ? etc.
Rules Table I
| No. | Good | Avoid |
| 1 | Nak = Mrgasiras, Revati, Chitra, Anuradha, Svati, Shatataraka, Hastha, Pusya, Dhanishta, Utthara, Uttarashada, U. Bhadrapad and Rohini | Nak = Bharani, Karthika, Thiruvathira, Ayilyam, Puram, Vishakam, Thrikketta, Pooratam, Pororuttathi. Veda Nak. |
| 2 | Day = TU SU | |
| 4 | Shukla 2,3,5,7,10,11,13,15 | Tithi = riktha 4,9,14, amavasya, S8 and K8 1st half of K7, S1 and P15 2nd half of K3,K10 and S11 |
| 7 | Month = Vaishakh, Paush, Phalgun, Shravan and Margasheersh. Some say Jyesha Karthik and Maagh. | Month = Mithunam, Karkatakam, Kanni, Dhanu,
Meenam. Karthika Nathu Vela = (Metam 26 to Etavam 10). Paush |
Rules Table II
| No. | Good | Avoid |
| 3 | Lag = Sthira Rasi = Tau Leo Sco Aqua | Lag = Metam, Thulam, Makaram, Sunrise Rasi
NavamshaLag and RasiLag = Mesh, Thul, Simha |
| 5 | No Papa grahas in 1,4,7,10,8 | One planet in 4 |
| 6 | Moon nak direction not in front or facing main door. | Mars in 8 |
| 8 | Aparanham and after Sunset to 2:00 a.m. | |
| 9 | Vrsha chakra - From Sun Nakshatra
4,5,6,7,15,16,17,18,23,24,25,26,27 -- or
Counting 1 from Sun Nakshatra |
|
| 10 | Sun Moo Jup Ven in neech or in 3,6,11,12 | |
| 11 | Shubh Karan | |
| 12 | Night time |
Rules
| Planet | Significator |
| Ravi | Griha Kartha |
| Moon | Wife |
| Jupiter | Sukh |
| Venus | Vitta |
| No. | Rasi Sun is in | Start building house from | Start Water Reservoir from |
| 1 | Mesh | Vayavya North West | Ishanya North East |
| 2 | Vrshab | Niririt South West | Ishanya North East |
| 3 | Mithun | Niririt South West | Ishanya North East |
| 4 | Kark | Niririt South West | Vayavya North West |
| 5 | Simha | Aagneya South East | Vayavya North West |
| 6 | Kanya | Aagneya South East | Vayavya North West |
| 7 | Tula | Aagneya South East | Niririt South West |
| 8 | Vrischik | Ishanya North East | Niririt South West |
| 9 | Dhanu | Ishanya North East | Niririt South West |
| 10 | Makar | Ishanya North East | Aagneya South East |
| 11 | Kumh | Vayavya North West | Aagneya South East |
| 12 | Meen | Vayavya North West | Aagneya South East |