Walt Disney Co. will begin a major expansion project next month at its first Hawaii resort in West Oahu, a year after its opening.

Aulani, a Disney Resort & Spa will add a third pool, splash zone, two food stations and retail space to its Hawaiian-themed offerings on 21 beachfront acres in Ko Olina.

Construction will start Sept. 10 and coincide with the final build out of the resort opening in mid-2013, the company said in a press release Wednesday. The cost of the project wasn’t disclosed.

Along with the expansion, the resort is temporarily closing its Wailana pool and bar in October through the duration of the construction. Its Makai Preserve stingray pond will permanently shut down for the new amenities.

The Waikolohe pool, two slides, a lazy river and Rainbow Reef snorkel experience will remain open.