The absence of approved building plans for buildings on a  property constitutes, in our law, a latent defect in property. Avoetstoots  clause in a sale agreement will address this issue and protect an innocent  seller from comebacks from the purchaser.  
For example, seller X, unawares  that there were no plans for certain of the buildings on his property, will not  be liable to buyer Y to make good his (Y’s)additional expenses incurred  when his planned renovation to his new home involves costs of subsequent  approval of existing renovations.
A question that often arises in this regard is the issue of  wendy houses. Is approval required? The Building Standards and Building  Regulations Act requires that property owners obtain municipal approval  generally in respect of all buildings, additions and renovations, no matter how  small. 
However, in certain instances relating to smaller changes, full plan  approval is not required, but the municipality must still be approached for  written consent that formal; building plan approval is not required.  "Minor building works" include, amongst others: 
iv.           "tool  shed not exceeding 10 m2 in area;
v.            child's  playhouse not exceeding 5 m2 in area;
vi.           cycle  shed not exceeding 5 m2 in area;
vii.          greenhouse  not exceeding 15 m2 in area;
x.            any  pergola;
xi.           private  swimming-pool", etc.
These building works do not constitute a general exemption:  the municipality must still be approached for written authority that plan  approval is not required.
