With the increase in customer traffic and demand for retail spaces inside the mall, a second phase called "New Wing" was added in 2003.

[7] In the 1990s, See Hoy Chan Holdings Group started developing a new town known as Bandar Utama comprising both residential and commercial areas.

[9] The IKEA store covered 7,431 square metres (79,990 sq ft) of space inside the mall.

The renovation included a relocation of the Jusco supermarket to the new area, additions of cinema screens, and a new entrance to the 1 First Avenue office building.

[3] An additional expansion of 592,015 square feet (55,000.0 m2) inside the mall included the third phase (known as 1 Utama E) which was opened on January 24, 2018.

[15] It features a surfing pool, a skydiving wind tunnel and several restaurants and cafes which aim to make the mall a multi-sport and entertainment venue alongside shopping.

Its 713 stores appeal to all economic strata,[4] from department stores such as AEON and Parkson,[2] to high-end international chains and multiple restaurants such as the Food District food court, Din Tai Fung, KFC, McDonald's, Texas Chicken, Dunkin' Donuts and Carl's Jr. and two cinema chains, TGV Cinemas and GSC.

[19] Aside from retail, 1 Utama offers sport amenities to the public including a bowling alley,[20] baseball cage,[21] climbing wall,[22] surfing pool and skydiving wind tunnel.

[25] The mall is connected to several major roads including Lebuhraya Damansara Puchong[26] and Lebuh Bandar Utama.

The first fire was on February 25, 2013, which started in a storage facility in the children's playground equipment store which caused the whole building to experience a power outage.

The heist was planned by a Latin American gang in advance before executing the burglary, which included hiding inside the mall as it closed, cutting off electricity, disabling the burglar alarm system, stealing CCTV recording units and melting safe doors using an oxy acetylene torch.