Rule of law also envisages that the illegal constructions which are constructed in violation of law must be demolished. If a structure is an illegal structure, even though it has been demolished illegally, such a structure cannot be permitted to come up again.
If there is an illegal construction then, one can go to the municipal corporation of the city and can lodge a complaint with the proper procedure. The municipal corporation will send a notice to the residents/owner of the property.
A notice is sent to the person residing in the illegal construction and is given a time period for reply. The person is also provided sufficient time period by the municipal corporation for obtaining a stay order from the court. If no action has been done by the owner then the construction is liable for demolition. The government has also launched an online portal, through which one can file a complaint against illegal construction. A person can also file a complaint with police and can take help for prevention of illegal construction.
That is, If there is an illegal construction then, a complaine in the municipal corporation of the city and can be lodged. Muncipal corporation will take the action accordingly.
Reference: section 340, section 336(2) of Delhi Municipal Corporation Act 1957