It is believed that about 25 people were working at the site when the incident happened.
The emergence of new players has sparked stiff market competition.
Big contractors contributed the most to last month's rise in non-performing loans.
Demand for the product has been lukewarm since the beginning of the year.
Construction activity dipped as some customers postponed projects amid polls uncertainty.
The country presents a profitable and growing market for solar equipment.
The guidelines require new buildings to be fitted before use.
The taxman has so far enlisted a total of 52,000 landlords against a target of 100,000.
The marketplace is dominated by quacks looking to make quick money doing shoddy work.
The state should offer incentives to encourage builders to focus on affordable homes.
Amsons Group offered Sh23.6bn to acquire 100% of Bamburi shares.
The company has secured financial backing for a 300MW geothermal project.
Yapı Merkezi is expected to complete the 272-kilometre railway in 48 months.