Unfortunately a temporary structure is defined in legislation as building which is not intended to remain where it is erected for more than 28 days
Yes it looks like it would be permitted development, however it's always worth checking in advance with the local planning authority as there may be planning conditions attached to the property which remove certain permitted development rights. This is particularly more prevalent on newer properties and estate housing. Bear in mind that under planning legislation car ports are still classed as an extension to the house and are considered differently to sheds and outbuildings etc.
Planning permission would be required unless it satisfies the requirements for permitted development which are as follow:
No more than half the area of land around the "original house" would be covered by additions or other buildings.
No extension forward of the principal elevation or side elevation fronting a highway.
No extension to be higher than the highest part of the roof.
Maximum eaves height of any extension within two metres of the boundary to be not more than three metres.
Maximum eaves and ridge height of extension to be no higher than existing house.
Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
Materials to be similar in appearance to the existing house.
On designated land (ie Conservation Areas, Areas of Outstanding Natural Beauty etc) no side extensions.