CONSTRUCTION of the eagerly anticipated $4 million Margaret Olley Art Centre in Murwillumbah is proceeding at a rapid pace, with the venue on track to be completed by December.

Gallery director Susi Muddiman said the slab floor incorporating 273 cubic metres of concrete was poured last week on the centre that will reproduce the studio and home of the much-loved artist who died at her Sydney home in 2011.

Thousands of red feature tiles were delivered this week to match the neighbouring Tweed River Art Gallery.

Work has also started on the standalone artist-in-residence studio neighbouring the centre.

"We're on track for Margaret Olley's home studio to be unpacked in November," Ms Muddiman said.

In the meantime, the number of tours of the "secret" storage shed currently holding Olley's artist's studio have been expanded from three to six due to public demand for a sneak peek at the items to be showcased at the centre. The tours are sold out.

Ms Muddiman said ABC television was set to film the tour that takes place on September 3.

The centre will honour the much-loved artist's wish that her artist's studio and elements of her Paddington home be re-created in a purpose-built extension to the Tweed River Art Gallery. The first sod was turned in April.