The bench also refused to vacate its stay on proposed amendments to the city's masterplan, rejecting the Delhi Development Authority's appeal.
"On the one hand, you have authorised colonies which follow rules and by-laws. On the other hand, you have unauthorised colonies which are not following rules and by-laws... Unauthorised colonies can't be placed in a better position than authorised colonies.
"We direct that construction should stop in unauthorised colonies till they follow by-laws," the bench said
The bench also questioned the authorities' intent in regularising unauthorised colonies, and said: "By regularising them you will say that whatever illegal they have done, will be regularised. You cannot have an area where there is no rule of law. Here, there are over 1,700 colonies".
The order came after taking into account the submissions of senior advocate Ranjit Kumar, who was assisting the court as amicus curiae, that by-laws do not apply to the illegal colonies and the construction was rampant there.
Additional Solicitor General Maninder Singh, appearing for the DDA, told the bench that building by-laws would be implemented in these colonies before they are regularised.
"The regularisation will be done as per the laws and building by-laws. Certificates, like fire, have to be obtained for regularisation of the existing buildings," he said.
The court also sought details and figures from Central Ground Water Board on the status of groundwater level in Delhi since 2000 onwards.
The Central government on April 9 had told the apex court that it has proposed to set up an STF to monitor issues relating to unauthorised constructions in Delhi and will take steps to demolish them.
The STF, to be chaired by the Vice Chairman of the Delhi Development Authority (DDA) and having representative from the office of Delhi's Lt Governor, the three civic bodies as well as the the New Delhi Municipal Council, the Delhi Jal Board, Delhi Police, Traffic Department, and Delhi's Transport, Revenue and Fire departments, will identify encroachments on the government land in Delhi and reclaim it.
It would also identify areas of congestion of traffic in Delhi and suggest measures to remedy the same to local bodies and other agencies.
The court was hearing pleas relating to the validity of Delhi Laws (Special Provisions) Act, 2006 and subsequent legislation protecting unauthorised construction from being sealed in Delhi.
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