LONDONDERRY — Crews are beginning work to redevelop the Citizens Bank branch on Route 102 in Londonderry. The project will make the bank branch smaller, and construct a Convenient MD urgent care center and a third retail space on the same lot.

Town planner Colleen Mailloux said the project was granted conditional approval by the Londonderry Planning Board in February, final plans were signed in the beginning of June and crews just began work this week.

The existing 6,500-square-foot bank at 42 Nashua Road will be reduced in size to 3,200 square feet. Its five drive-thru lanes will be reduced to one lane.

The urgent care building will be 5,100 square feet and the additional retail building will be 4,000 square feet. Mailloux said the tenant for the retail space has not been named yet.

NH Six Realty Trust is the landowner. The Dubay Group is the engineering firm attached to the project.

Mailloux said the bank building was first built in 1972 and the redevelopment will also be an aesthetic upgrade.

“The new architecture definitely fits with more current architectural standards,” Mailloux said. “There was a lot of time spent on the review of that.”

During the construction period, bank customers will be able to do business at a temporary office trailer set up on the property, she said.

For Citizens, the redevelopment is part of an active program to “review and modernize” its branches, according to Sarah Lindstrom, Citizens Bank retail director for the Greater Boston and Southern New Hampshire area.

“As a result, our branch of the future will be smaller,” she said.

Driving the “strategic transformation” is a change in customer behaviors, especially with new technology that allows for mobile and online banking, as well as more advanced ATMs with more options, Lindstrom said.

“We really think technology is an enabler, not an either-or in the banking experience,” she said.

In fact, Lindstrom said about 86 percent of consumers still prefer to use their local bank branch for transactions because people still need or want that human interaction.

Lindstrom said branches will be redeveloped on a case-by-case basis.