A transfer apparatus for receiving the chair seat of a wheelchair and supporting the chair seat in the base of a washing enclosure. The transfer apparatus has a chair support member including a chair support track section that can be positioned in the washing enclosure base. The transfer apparatus also has a bridge portion including a bridge track section that is movably mounted to the chair support member. The bridge portion transitions between a storage position and an in-use position. In the in-use position the bridge portion is engaged with the wheelchair and the bridge track section is aligned with the chair support track section. The chair seat can be translated from the wheelchair along the bridge track section to the chair support track section when the bridge portion is in the in-use position and engaged with the wheelchair.