# Trident Block

Trident Blocks (Chinese: Y型大廈)，sometimes referred as TR，is a three-wing design. Trident blocks are split into four types, which are Trident 1, Trident 2, Trident 3, and Trident 4. They are mostly built between 1984 and 1992. Most Trident blocks are used as public housing or Home Ownership Scheme estates.

## Overview

The origins of the name suggest that the building is Y-shaped, with three wings. The look of the building and the units look different than one another. The design has low flexibility and the height can't be changed. It takes a lot of land. Therefore, most are located in the new towns of Hong Kong.

## Types
### Trident 1

Trident 1 blocks are 35 stories tall and have 36 units per floor. Most units could only accommodate 3 or fewer people.
Trident 1 blocks can be found in Cheung Hong Estate, Shan King Estate, Fu Shin Estate, Lok Wah Estate, Mei Lam Estate and Lei Tung Estate. Lei Tung Estate currently holds the record with the most Trident 1 blocks at 4.
Trident 1 blocks have 12 units per wing. It has 36 units per floor. A typical Trident 1 block has 1,224 units, but some can have up to more than 1,300. This is why units are subdivided.
In Cheung Hong Estate, there is two designs of Trident 1 blocks. Fu Shin Estate currently has a Trident 1 block with an odd number of units per floor, which is 30. Trident 1 blocks are rarely sold.

### Trident 2

A Trident 2 block is 35 stories tall with 816 units and 8 units per wing. There are 24 units per floor. 3/4 of units are classed as Type B, meaning families with 4 or 6 people can live in this type. This is the first time that a concept called 'a house with multiple rooms' is used. 1/4 of the units are Type C units, meaning 7 or more can live there. They are located in the each end of the wing.
Most of them are completed between 1984 and 1989. The first Trident 2 block completed is in Cheung Wah Estate. Other blocks include Pok Hong Estate and Cheung Hong Estate. In fact, in some cases, Trident 2 blocks are also found in Home Ownership Scheme estates, like Ching Shing Court, May Shing Court, and Fung Shing Court. It is only available to Green Form Subsidised Home Ownership Scheme members, an early form of Home Ownership Scheme. The last Trident 2 blocks are in Long Ping Estate. The record holder for the most Trident 2 blocks in an estate is Lei Tung Estate, with 6 blocks.

### Trident 3

Trident 3 blocks are 35 stories tall and have 24 units per floor, with 8 units per wing. It can have 800 to 1100 units. It is also the first design to feature air conditioning and the first to use prefabrication (Tai Wo Estate). It takes up a lot of land. It is mostly found in the new towns of Hong Kong. Most are completed between 1987 and 1992. Heng On Estate currently haves the first Trident 3 blocks. It can be found in Tin Yiu Estate and Tak Tin Estate. There are some cases where Trident 3 blocks end up in Home Ownership Scheme courts. Ching Nga Court and Ching Tai Court are the only HOS courts to have Trident 3 blocks.

### Trident 3A

There are also Trident 3 blocks that have ‘subdivided units’. For example, two of the wings have 5 subdivided units at the end while one of the wings have 4 subdivided units. Therefore, it brings the total up to 32 units per floor with 14 subdivided units. This variant is called ‘Trident 3A’.

### Trident 4

Trident 4 blocks are similar to Trident 3 blocks, but take up less space. Usually, these types of blocks are 35 stories in height. Some are even shorter due to height restrictions by Kai Tak Airport, like Tung Tau Estate, Tsui Wan Estate, Siu Sai Wan Estate, and Lei Cheng Uk Estate. It only has only 414 - 850 units in a Trident 4 block, 6 to 9 units per wing, and 18 to 25 units per floor. The first Trident 4 blocks are in Wah Kwai Estate. The last Trident 4 blocks are completed in Tin Yiu Estate. Lei Cheng Uk Estate and Choi Ha Estate also have Trident 4 blocks. Some Home Ownership scheme courts also have Trident 4 blocks. Fung Chuen Court and Chung Nga Court are the only HOS courts to have Trident 4 blocks.

## Gallery

* Trident 1 blocks in Lei Tung Estate, Ap Lei Chau. They are built in 1987.
* Trident 2 blocks in Tin Ping Estate, Sheung Shui. They are built in 1986.
* Trident 2 blocks in Po Lam Estate, Tseung Kwan O. They are built in 1988.
* Trident 3 blocks in Heng On Estate, Ma On Shan. They are built in 1987.
* Trident 3 blocks in Tin Yiu Estate, Tin Shui Wai. They are built in 1992.
* Trident 4 blocks in Lei Cheng Uk Estate, Sham Shui Po. They are built in 1989.

## List of blocks

Trident Blocks in Hong Kong Isl. and Kowloon :
| Hong Kong Isl. and Kowloon | Eastern New Territories | Western New Territories |
| Trident Blocks in Hong Kong Isl. and Kowloon DistrictEstates/HOS CourtsQuantity by typeCompletion Y1 Y2 Y3 Y4 Eastern Tsui Wan Estate - - - 4 1988 - 1989 Siu Sai Wan Estate - - - 4 1990 King Tsui Court - - - 1 1991 Fung Wah Estate - - - 2 Southern Lei Tung Estate 2 6 - - 1987 Wah Kwai Estate - - - 5 1990 - 1991 Sham Shui Po Lei Cheng Uk Estate - - - 2 1989 Wong Tai Sin Chuk Yuen North Estate - - 8 - 1987 and 1989 Fung Tak Estate - - 4 1 1991 - 1992 Tung Tau Estate - - - 2 1991 Lower Wong Tai Sin Estate - - - 4 1989 - 1990 Fung Chuen Court - - - 1 1991 Pang Ching Court - - 1 - 1991 Kwun Tong Lok Wah Estate 4 - - - 1985 Tsui Ping Estate (North) - 1 - - 1986 Tsui Ping Estate (South) - - - 2 1989 - 1990 Hing Tin Estate - - 3 - 1987 - 1988 Choi Ha Estate - - 1 2 1989 - 1990 Tak Tin Estate - - 3 2 1991 - 1992 Hong Ying Court - - 1 - 1991 Total 6 7 21 32 ♦ | Trident Blocks in Eastern New Territories DistrictEstates/HOS CourtsQuantity by TypeCompletion Y1 Y2 Y3 Y4 Sha Tin Mei Lam Estate 1 - - - 1985 Fung Shing Court - 3 - - May Shing Court - 2 - - 1984 - 1985 Pok Hong Estate - 3 - - 1985 Heng On Estate - - 6 - 1987 Yiu On Estate - - 2 4 1988 - 1989 Hin Keng Estate - 4 1 3 1986 - 1988 Kwong Yuen Estate - - 2 4 1989 - 1990 Kwong Lam Court - - - 3 1990 Tai Po Fu Shin Estate 2 4 - - 1985 Kwong Fuk Estate - 2 - - Tai Wo Estate - - 6 - 1989 Po Nga Court - - 3 - Fu Heng Estate - - 3 3 1990 - 1991 Chung Nga Court - - 1 - 1992 Wan Tau Tong Estate - - 3 - 1991 - 1992 Yat Nga Court - - - 2 1991 Chung Nga Court - - 1 2 Northern Cheung Wah Estate - 2 - - 1985 Tin Ping Estate - 3 2 1 1986 - 1987 and 1989 - 1990 Wah Ming Estate - - 4 3 1990 On Shing Court - - - 1 Sai Kung Po Lam Estate - 4 - - 1988 Tsui Lam Estate - 4 - - King Lam Estate - - 3 2 1990 - 1991 Ho Ming Court - - 1 - 1990 Total 3 31 38 30 ♦ | Trident Blocks in Western New Territories DistrictEstates/HOS CourtsQuantity by typeCompletion Y1 Y2 Y3 Y4 Kwai Tsing Cheung Hong Estate 2 2 - - 1985 - 1986 Ching Shing Court - 1 - - 1986 Tsing Yi Estate - 2 1 1 1986 and 1989 Cheung On Estate - - 6 - 1988 - 1989 Cheung Fat Estate - - 1 - 1989 Ching Nga Court - - 1 - Cheung Hang Estate - - 1 3 1990 Yuen Long Shan King Estate 3 3 - - 1985 Tin King Estate - - 2 1 1990 Kin Sang Estate - - - 4 1989 Leung King Estate - - 5 2 1988 - 1990 Siu Pong Court - - - 1 1991 Siu Lung Court - - - 1 Siu Hin Court - - - 2 Siu Kwai Court - - 1 1 1990 Tuen Mun Long Ping Estate 3 - - 1987 and 1989 Tin Yiu Estate - - 3 2 1992 Total 5 11 21 16 ♦ |