Development means the carrying out of building, engineering, mining or other operations in, on, over or under land, or the making of any material change in the use of any buildings or other land (Town & Country Planning Act section 5 ). Since development includes building where the Planning Act is appropriate Planning Permit is also required.
Under the Building Act, permission is required for any of the following :
a. Construction/Erection of building
b. Demolition of building
c. Additions/alterations and external repairs
d. Temporary building & Farm House
e. Change in use of building from one use class to another e.g. Residential to Commercial