Wangwe wondered why the 15-storey building ended up costing more than the initially planned 36 floors, despite the project involving the elevation of an existing building.
He said that such a variation should not result in a 100 per cent cost increase.
"What made the 15 floors more expensive than building the revised 21 floors? Even if there were variations, it cannot be 100 per cent," said Wangwe.
The committee questioned the rationale behind the drastic reduction from 36 floors to 15 floors, especially since the work was in progress and the Bill of Quantities (BQs) was prepared for the 36 floors.
The committee sought to know if the BQs had to be revised due to the variation.
The committee demanded an explanation on why billions of shillings were paid for incomplete work.
But China Jiangxi International Limited Director Jimmy Ji told the committee they were on the site only to build and were not involved in the decisions on the variations.
"We are contractors and not involved in the decision-making of the variations. We are just on-site for construction purposes, and when the decision of variation was reached, we were building the 15th floor," Mr Ji said.