This excludes the cost of hiring the Nasrec expo centre and catering costs.
Party insiders said while all the rooms would be occupied, this total figure excluded rooms and suites booked for leaders at their own expense, for campaign lobbyists, personal security and drivers.
The costs budgeted by the party for accommodation exclude any additional costs from delegates breaking or destroying anything in the hotels, the source noted.
Some ANC leaders with a penchant for luxury living are rumoured to have booked suites at exclusive five-star establishments across the province.
The ANC hotel bill ranges from R500 a night for some delegates up to a premium of R1,550 a night for rooms booked for the party's top leadership.
The hotels are booked as far as Centurion in the north, and Kempton Park in the east.
The party negotiated for delegates to be served dinner at their hotels at an additional cost.
The hotel with the most ANC delegates is Birchwood Hotel, on the East Rand; it is expected to house close to 900 delegates.
Rooms in a four-star hotel in upmarket Sandton were booked for members of the national executive committee but more than half of its members preferred to sort out their own accommodation.
Luxury buses and minibuses have been arranged to ferry delegates and ANC guests from the conference venue in Nasrec to their hotels across the province.
Delegates have to check out by the latest on Thursday morning.