The deficiencies, plus conservation, rehabilitation, and upgrading, were addressed when a major, $52 million renovation was researched in 1996 and undertaken between 2002 and 2006. Public Works and Government Services Canada contracted the Thomas Fuller Construction Company (operated by the building designer's great-grandsons) to manage a project that fixed leaks in the roof and crumbling mortar in the walls on the exterior, as well as extensive repairs to the wood and plaster work and the installation of climate control systems on the interior. Also done at the time was a nine-metre-deep excavation of the bedrock beneath the library building, in order to provide more storage space, mechanical areas, and a link to an existing loading dock. The project used precision survey, laser measurement, photogrammetry, and the then fledgling technology of Computer Aided Three Dimensional Interactive Application. After four years of work, the library was opened to the public, with tours of the library resuming on 5 June 2006, though Thomas Fuller Construction filed a $21 million lawsuit against the Crown for cost overruns.