If you've purchased land using only a bond paper, which is not a registered document, your ownership and the legality of any construction may be questionable. Even if the area isn't officially registered with GHMC, you will likely need to obtain construction permissions from the relevant local authority, such as GHMC or HUDA. It is strongly advised to consult with a local legal expert, providing them with all your documentation, to understand the specific local laws and ensure you proceed correctly.