A Xuan Kong Da Gua reading hangs on one number — the bearing the building faces — so a renovation changes the reading only if it changes that number. Repainting, rearranging rooms or rebuilding the interior leaves the pair exactly where it was. Moving the main entrance to another side, or rebuilding the front so the building faces a different way, gives it a new facing hexagram and a new sitting hexagram behind it.
Why room-by-room sequencing does not apply
Some Feng Shui methods read a building sector by sector and so have an order in which to disturb them. Xuan Kong Da Gua, as the ring defines it, does not: it assigns hexagrams to bearings 5.625° wide, not to the eight sectors of a floor plan, and a building is read from the one it faces and the one behind it. A renovation plan that ranks rooms by “their hexagram” is using the retired stacked-trigram idea, not the ring.
When a renovation does change the facing
If the main door moves or the front is rebuilt, measure the new facing the same way as the old one: a level compass away from metal, corrected for magnetic declination. Then check the new pair. Is its 卦運 in the half of the cycle the period stands in (in Period 9, 下元: 卦運 6–9)? Does the new bearing avoid the boundaries — within one line (0.94°) of a hexagram boundary, or on the line between two palaces (大空亡) or two mountains (小空亡)? A new facing chosen a few degrees off a boundary is worth more than one chosen by eye.
Timing against the period
The verdict turns with the calendar only at the halves of the 180-year cycle. Period 9 (Li Chun 2024 to Li Chun 2044) and Period 8 before it both belong to 下元, so a pair that was timely in 2020 is timely now. The next turn is the Li Chun of 2044, when Period 1 opens in 上元: pairs with 卦運 1–4 become timely and pairs with 卦運 6–9 do not. A renovation meant to last decades can weigh both halves.
References
Canonical sources that inform this guide.
- Feng Shui/Xuan Kong Da Gua/Compass Location · WEBSITE
- Feng Shui/Xuan Kong Da Gua/Binary Representation of the 64 Hexagrams · WEBSITE
- Bagua (Eight Trigrams) · WIKIPEDIA
- I Ching · WIKIPEDIA