I Block
I Blocks () are a design of public housing in Hong Kong. It is mainly divided into three variants: Single I, Double I, and Triple I. Only a few estates currently have I blocks as of today. The existing blocks were built between 1981 and 1983. Variants 
The I block can be divided into three variants: Single I, Double I, and Triple I.

Etymology 
The building looks like the letter I. There are three wings - two long and one at the middle. It can be modular by connecting another or two more I blocks. This gave birth of Double I and Triple I. Naming 
Unlike other blocks, Double I blocks are only given one name. Such examples include Mei Fung House in Mei Lam Estate and Shek To House in Shek Wai Kok Estate. History 
The first I blocks was completed in 1981, located at Sun Tin Wai Estate. (Shing Wai House, Foo Wai House, Yan Wai House, Fung Wai House, Wing Wai House) The first Double I buildings are located at Shun Tin Estate, completed about the same as shown above. The last I blocks to be built are located at Chak On Estate, completed in 1983. Overview 
Usually, the height of I blocks may vary. (14-21 stories) Only medium and large units are provided inside the block. (32-39 sqm) Therefore, in public housing estates, it is built with Old Slab to balance the size of units. Due to the I block taking a lot of space and units focusing on only one size, the I block was stopped being built in future projects. Therefore, few currently have I blocks as of today. Single I: Single I block contains 27 units per floor. Double I: Double I block contains 54 units per floor. Triple I: Triple I block contains 81 units per floor. List of blocks 
The I blocks take up a large amount of space. Therefore, most are found in the new towns of Sha Tin, Kwun Tong, Sham Shui Po, and Tsuen Wan. See also 
 Types of public housing estate blocks in Hong Kong
H Block (Hong Kong)

References

External links 

Single I Floor Plan
Public housing in Hong Kong