It has emerged that some of the materials in the market are sub-standard.
The rising costs have been associated with the high global oil and steel prices.
Low cost panels and building blocks will boost affordable housing in Kenya.
Locals urged to improve their standards so as to compete with Chinese firms.
Project seeks to improve the living conditions of 5.4 million slum dwellers.
Nine people were believed to be working at the site when the incident occurred.
Developers will be allowed to build up to 75 floors in high-density areas.
The much-awaited summit will take place on June 12-13, 2025.