Loft's In Space

Here is another classic unnecessary apostrophe, unless a man called 'Loft' is in space! However, that is very unlikely to be advertised on top of a building site.

This is definitely not a contraction and surely not possessive either! Therefore, it is incorrect.

Sam Say's

Here is a classic SPaG fail, an unnecessary apostrophe. This might not be setting a very good example to the children that the sign was designed to protect!

This is definitely not a possessive apostrophe and 'says' isn't a contraction either!