A portable shelter for providing cover over an area, wherein the shelter is coupleable to a structure, the portable shelter comprising a first base member and a second base member, each of which are coupleable to the structure; two subframe assemblies, each subframe assembly comprising a vertical support member having a first end and a second end, wherein the first end is coupleable to a respective base member, at least two arm members, each having a first end and a second end, wherein the first end of each respective arm member is pivotally coupled to the second end of vertical support member, at least two brace members, each having a first end and a second end, each respective first end being coupled to the vertical support member and each respective second end being pivotably coupled to a respective arm member, a first coupling arrangement for pivotably coupling the respective first end of each arm member to the second end of the vertical support member, a second coupling arrangement, slideably coupled to the vertical support member, for coupling the respective first end of each brace member to the vertical support member; and a canopy supporting assembly coupled to the two subframe assemblies, wherein the canopy supporting assembly supports a canopy and provides cover over the area.