Work will immediately begin on the University of Dayton Arena’s $72 million renovation, officials said. This is a rendering of the planned changes. CONTRIBUTED

TIMELINE: Here’s when to expect changes at UD Arena

Work will immediately begin on the University of Dayton Arena’s $72 million renovation, officials said.

In fact, some behind-the-scenes preparation work has already begun on the three-phase project, officials said. Work will ramp up in about three weeks from now.

Some of the biggest changes to the arena won’t be seen for several years. Those seeking better WiFi connections will have to wait until 2018-19, while air conditioning won’t flow through the building until 2019-20.

Here’s a look at when fans will see the big changes:

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