Passengers at Charleston International Airport are encountering extensive construction work today as airport expansion and renovation begins in earnest.

The four lanes closest to the terminal building will be closed for several months as work begins on replacing the front brick wall with glass to allow more light into the building. A construction crane will also be parked in the closed lanes to work on the roof, where a dome will be placed over the main lobby.

Two of the lanes could reopen in April, but the other two will be closed for much of the year, according to Airports Director Paul Campbell.

Inside, passengers will be routed along makeshift corridors around construction zones to the two concourses.

The airport is undergoing a $189 million renovation and expansion, including the addition of five new gates, a third baggage carousel, consolidated security checkpoints, a new rental car pavilion and extensive cosmetic changes.

Work is expected to be completed in August 2015.

Reach Warren L. Wise at 937-5524 or twitter.com/warrenlancewise.