MP John Mbadi, on the public investments committee, led the uproar over the original order.
"We couldn't understand how members of parliament would sit on a seat costing about 400,000 Kenyan shillings - about $5,000 - that by any standards could put up some small house for someone," he told the BBC.
"It was just completely ridiculous," he said.
Our reporter says many argued the eventual cost of the chairs was still too high.
David Langat, who looks after industrial activities within Kenyan prisons, said all the materials were sourced locally but the chair moulds were expensive.
He told the BBC the chairs, which weigh more than 50kg each, were fireproof and came with a 30-year guarantee.
At the moment Kenya has 220 members of parliament, but the chamber has been fitted with 350 chairs - the number of MPs to be elected next March under the country's new constitution.
Kenyan MPs have often been criticised for giving themselves salary increases - they are among the highest paid in Africa.