The Pavilion IX renovation project included updating fire suppression systems and appliances and replacing window air conditioning units by connecting the pavilion to the University's central heating and air system. The project also included refinishing the original heart pine floors.

Pavilion IX is not large. It's only about 5000 square feet and rather than large columns in front, it has a curved entrance, which Jefferson modeled after the Hotel D'Guimard, which he saw in Paris.

The building was extended in the rear in the 1830s and a porch was added in the late 1800s. The kitchen was renovated in 1983, expanding it out to part of the porch. At some point, a window in the original rear wall was closed off. The project restored the window with translucent glass, and the current kitchen window in the rear wall was enlarged, letting in more natural light.