City Hall, the home of City of Lincoln Council, will close half an hour earlier from September 5.
Its new opening times will be 9-4.30pm. City Hall will also open at 9am on Wednesday mornings, rather than 9.30am as it currently does.
Telephone calls will continue to be handled from 8.30am to 5pm Monday to Thursday and until 4.30pm on Fridays.
Jo Crookes, Head of Customer Services Revenues and Benefits at the City of Lincoln Council, said: “These changes will allow our teams to provide extra cover during our busiest periods, which means we can help customers quicker and more effectively.
“The new opening times reflect the results of the research, which showed that footfall after 4.30pm is very low. This move builds on the improvements we’ve made to the Customer Access Centre at City Hall, the new online services we offer and the new customer charter that we are currently developing.”