Prefabricated shower pan

1. A prefabricated shower pan for installation on an installation site having a waste outlet hole, the prefabricated shower pan comprising:

a drain hole extending through a shower pan floor and configured to communicate with the waste outlet hole at the installation site via a drain assembly;

the shower pan floor having a flat slanted upper surface;

one or more side walls, each surrounding and supporting a portion of a circumference of the shower pan floor;

an accommodation space disposed below the drain hole and configured to accommodate the drain assembly for connecting the drain hole and the waste outlet hole; and

a plurality of support structures attached to a lower surface of the shower pan floor and the one or more side walls, and each of the plurality of support structures extends to an installation subfloor when the shower pan is installed on the installation subfloor,

wherein the drain assembly is one selected from a straight drain, an offset drain, and a side/elbow outlet drain, and the accommodation space is a continuous space enclosed by the shower pan floor, the subfloor at the installation site, and at least one of the one or more side walls, and

wherein a height of the accommodation space, measured from the installation floor to the bottom of the drain hole, is at least 2 inches but not more than 6 inches and a width of the accommodation space is at least 7 inches.

2. The shower pan of claim 1 , wherein the plurality of support structures form a grid of interconnected supports.

3. The shower pan of claim 2 , wherein the accommodation space is defined by the plurality of support structures, the shower pan floor, and at least one side wall.

4. The shower pan of claim 3 , wherein a ratio of a width of the shower pan and the width of the accommodation space is 4:1.

5. The shower pan of claim 2 , wherein the accommodation space is surrounded by the plurality of support structures and the shower pan floor.

6. The shower pan of claim 1 , wherein the one or more side walls has a height of at least 6 inches, the drain hole has a height of at least 3 inches.

7. The shower pan of claim 1 , wherein the shower pan floor comprises a water receiving step defining a water receiving area disposed around the drain hole, the water receiving area configured to receive water from the shower pan floor, and

wherein a height of the water receiving area is lower than a height of the shower pan floor and the water receiving area has a slanted surface towards the drain hole.

8. The shower pan of claim 7 , wherein a height of the one or more side walls is greater than the height of the shower pan floor, and the height of the water receiving area is higher than a height of the drain hole.

9. The shower pan of claim 1 , wherein at least one of the one or more side walls has an opening configured to accommodate a passage of a connecting member to pass through the opening.

10. The shower pan of claim 9 , wherein more than one of the one or more side walls has an opening, each opening is configured to accommodate a passage of the connecting member to pass through each opening.

11. A shower pan installation kit comprising:

the shower pan of claim 1 ; and

a shower pan drain assembly.

12. The shower pan installation kit of claim 11 , wherein the shower pan drain assembly is one selected from a straight drain, an offset drain, and a side/elbow outlet drain.

13. The shower pan of claim 7 , wherein the water receiving area in the shower floor pan defines an upper ceiling of the accommodation space and the plurality of support structures and an front end wall amongst the one or more side walls defines a circumference of the accommodation space.