Barnsley Norse has been awarded the cleaning contract for eight of Wakefield and District Housing's (WDH) corporate buildings.
Wakefield and District Housing is one of the UK's largest social housing providers, responsible for more than 31,000 homes in the Wakefield district.
The three-year deal, worth at least £120,000 a year, includes WDH's headquarters - Merefield House.
The contract for all sites covers cleaning about 8,800 square metres of offices, reception areas and meeting rooms in public-facing sites.
The new contract began on 1 November.