Lebanon — After three months of wrangling with developers, the Lebanon Planning Board voted on Monday to approve an 117-unit subdivision off of Prospect Street.

New construction will add 43 single-family homes and 74 townhouse-style units to the Prospect Hill development near Lebanon Middle School. About 54 homes north of the proposed expansion are already complete and are expected to share infrastructure costs and a homeowners association with neighbors to the south.

Plans for the expansion project have long been in the works and were approved by the city as recently as 2014. But progress stalled when Manchester-based developer Brady Sullivan Properties missed the filing date to request an extension for the project, which then started a formal hearing process in September.

In subsequent meetings, board members and the public grew concerned about the quality of work on the first round of homes and roads already completed by Brady Sullivan, and the groups debated whether it would be wise to lower a security bond on the remaining work there. Monday’s meeting was less contentious, though, with board members worried most about traffic.

Ultimately, the board decided to order a new traffic report to gauge road conditions once 90 of the new units are filled.

The report will specificity study the Laplante Road and Moulton Avenue intersections with Route 4. Brady Sullivan will be responsible for mediating any traffic caused by its developments.

Officials with the developer said on Monday they expect it will take a year to complete infrastructure projects on the site, and a timeline for the new homes will depend on buyers’ interest. With business booming, they predicted all homes could be finished in two years.