Why Kim Lâu, Hoang Ốc and Tam Tai are three separate checks
These three taboos are independent. Kim Lâu divides the lunar age by nine to see whom it harms, Hoang Ốc counts six palaces from the lunar age to see whether the house may be abandoned, and Tam Tai compares the birth year's earthly branch triad with the building year. An age can break one rule and pass the others, so the three should never be merged into a single lookup.
It is also worth saying early: this is a widespread folk custom, not a binding rule. Feng shui specialists quoted in the media say the decisive factors are timing, land, orientation and the land's energy, while age is only a minor part. Some go further and say any age can build, and the real question is whether the land and direction are favourable at that time.
Which ages does the 2027 Đinh Mùi year affect?
The 2027 Đinh Mùi year carries the earthly branch Mùi. Under the common Tam Tai rule, the Hợi, Mão and Mùi triad hits Tam Tai in Tỵ, Ngọ and Mùi years. So in 2027, people born in Hợi, Mão and Mùi years fall under Tam Tai. Kim Lâu and Hoang Ốc, by contrast, depend on each person's lunar age, so there is no fixed list of ages tied to the year itself.
How to calculate each check
Kim Lâu: lunar age divided by nine
Take the lunar age and divide by nine. If the remainder is 1, 3, 6 or 8, the age breaks Kim Lâu. Remainder 1 is Kim Lâu Thân (harms oneself), 3 is Kim Lâu Thê (harms the spouse), 6 is Kim Lâu Tử (harms children), and 8 is Kim Lâu Lục Súc (harms livestock). A ready lookup list from Tuổi Trẻ includes 12, 15, 17, 19, 21, 24, 26, 28, 30, 33, 35, 37, 39, 42, 44, 46, 48, 51, 53, 55, 57, 60, 62, 64, 66, 69, 71, 73 and 75.
Hoang Ốc: counting six palaces on the hand
The six palaces run: Nhất cát (good), Nhị nghi (prosperous), Tam địa sát (illness), Tứ tấn tài (wealth and fortune), Ngũ thọ tử (separation, lifespan concerns), Lục hoang ốc (hard to finish, no success). Count on the six finger joints, starting at palace 1 for age 10, palace 2 for age 20, palace 3 for age 30, and so on. A ready lookup list from Tuổi Trẻ includes 12, 14, 15, 18, 21, 23, 24, 27, 29, 30, 32, 33, 36, 38, 39, 41, 42, 45, 47, 48, 50, 51, 54, 56, 57, 60, 63, 65, 66, 69, 72, 74 and 75.
Tam Tai: by earthly branch triad
- Thân, Tý, Thìn: Tam Tai in Dần, Mão, Thìn years.
- Tỵ, Dậu, Sửu: Tam Tai in Hợi, Tý, Sửu years.
- Hợi, Mão, Mùi: Tam Tai in Tỵ, Ngọ, Mùi years.
- Dần, Ngọ, Tuất: Tam Tai in Thân, Dậu, Tuất years.
Quick comparison table
| Check | Based on | Short method | Breaks when |
|---|---|---|---|
| Kim Lâu | Lunar age | Divide by nine, read remainder | Remainder 1, 3, 6, 8 |
| Hoang Ốc | Lunar age | Count six palaces | Lands on Tam địa sát, Ngũ thọ tử, Lục hoang ốc |
| Tam Tai | Birth year branch vs building year | Triad lookup | Hợi, Mão, Mùi group meets Tỵ, Ngọ, Mùi years |
Whose age should be checked?
Folk custom usually checks the husband's age, following the saying that marriage looks at the woman's age while house building looks at the man's. The common explanation draws on yin yang and the five elements: the husband represents yang and is seen as the family pillar. This is a cultural convention, not a natural law, and many families today are more flexible, especially when the wife owns the land or is the main earner. This article does not claim one way is absolutely right; it simply states which convention it follows.
What if all three are broken?
Borrowing someone else's age for ground breaking is the common folk answer. Modern feng shui specialists, however, say borrowing an age is only psychological, does not neutralise anything, and can create paperwork trouble. The view quoted in the press is that there is no need to borrow an age; instead, ask a person with good fortune to perform the ground breaking on behalf of the owner, ideally a healthy middle aged person, without transferring any title or asking anyone else to raise the ridge beam.
Note too that these taboos apply only to new construction or major work touching foundations, roofs or extra floors. Small repairs and interior work do not require an age check, and buying a house to live in or invest does not require one either.
Preparing offerings for the ground breaking ritual
This list is a reference; each region and family may adjust it. Ask elders in your family or a local ritual practitioner to match local custom.
- Incense, candles, joss paper.
- A five fruit tray, fresh flowers, betel and areca.
- Boiled chicken or roast pork, sticky rice, regional cakes.
- White wine, tea, water.
- Salt, rice, a little clean soil or sand.
- A small hoe or shovel for the symbolic dig.
- A small table or clean mat, offering trays.
Safety note: burn incense, candles and joss paper on a heat resistant tray, away from foam, plastic, paint cans and temporary wiring. Do not burn joss paper indoors or near flammable construction materials. Extinguish ash and candles completely before leaving.
Ritual order
Step 1: Choose date and time
Pick the date and time by the local lunar calendar or with the ritual practitioner's guidance. If someone else will perform the ground breaking, agree on who that is in advance, ideally a healthy middle aged person with good fortune.
Step 2: Set up the offerings
Clear the spot where the table will stand, avoiding waterlogged ground or the edge of the foundation pit. Arrange incense and candles centrally, fruit and food to the sides. On an active site, fence the ritual area off from machinery and heavy materials.
Step 3: Light incense and pray
The officiant lights incense and prays. The prayer should state the owner's name, the land address, the date and time of ground breaking, and ask the local earth deity and spirits to witness and bless the construction. There is no need to memorise a long fixed text; sincerity and clear information matter more.
Step 4: Ground breaking
After the prayer, the officiant makes one symbolic dig with a hoe or shovel. Some regions scatter salt and rice, others bury a little clean soil or sand. Joss paper may be burned afterwards, keeping the fire in a safe area and fully extinguished.
Step 5: Close and record
Clear the offerings and keep a note of the date, time and officiant's name for later reference. If construction runs past Lunar New Year into the next year, that is normal for large projects; do not shorten stages just to avoid the taboo, as builders warn that construction time should follow the project scale first, and that starting in the rainy season makes foundation work harder.
Key takeaways
Kim Lâu, Hoang Ốc and Tam Tai are three different calculations, not substitutes for one another. In the 2027 Đinh Mùi year, the Hợi, Mão and Mùi groups hit Tam Tai, while Kim Lâu and Hoang Ốc must be calculated per person from the lunar age. All of this is folk reference that varies by region and family, with no single correct version. Land, orientation, finances, paperwork and construction quality remain the most important factors.
