Any building taller than five storeys and coming up along a stretch of Kalighat Road close to chief minister Mamata Banerjee’s house will need the approval of the state security advisor, according to an order issued by the Calcutta Municipal Corporation’s commissioner on Wednesday.

The restriction will remain in force on a stretch that extends 150m to the south and 300m to the north of the Kalighat Road-Hazra Road crossing.

“Erection of any new masonry building above the height of 15.50 metres from the ground within 150 meter of either side of Kalighat Road and Hazra Road in south (and) up to 300 metres towards north requires special approval of the security advisor, government of West Bengal,” the order says.

A civil engineer said a 15.5m-high building usually has five storeys.

Kalighat Road, which is intersected by Hazra Road, merges with Harish Mukherjee Road in the north and goes towards the Kalighat temple in the south.

Chief minister Mamata Banerjee lives on Harish Chatterjee Street, which runs parallel to a portion of Kalighat Road. Her nephew, Diamond Harbour MP Abhishek Banerjee, lives not too far from her house.

The municipal commissioner’s order says the measure was being adopted “for the purpose of security and safety of the important Z-Plus category protected VIPs”.

The bar will only apply to new buildings and not existing structures.

The order added that if any building in the area above the stipulated height “commenced, carried on or completed without obtaining approval of the security advisor”, the CMC will “by written notice direct the owner to demolish or alter the building”.

The CMC may also demolish or alter the building “at the expense of the owner”.

Some CMC officials said as far as they could remember, there were a couple of projects on the restricted zone that were still under construction and with approved plans of more than five-storeys. They were “not sure” if construction of these buildings would be stopped following the order.