As per Maharashtra Co-operative Societies Act, 1960, model Bye-laws of Co-operative Housing Societies (2014/2023), the Balcony attached to a flat is part of the flat holder’s exclusive use, but the outer façade, structural slab, beams, and elevation are common areas. Therefore any permanent alteration affecting elevation technically requires society permission.
However covering the balcony with steel sheets / temporary roofing considered as minor alterations for safety / weather protection are not treated as unauthorized construction unless they increase carpet area, change structural load and affect fire safety or elevation drastically.
The Temporary, removable coverings, no extension beyond sanctioned balcony area, no obstruction to light, ventilation, or safety of others and no encroachment on common areas or neighbour’s rights do not come under illegal construction.
A society cannot selectively enforce rules when the same deviation exists widely.
The MC cannot issue removal notices unless there is a General Body Resolution or PMC has issued a specific demolition / removal notice or if the structure is permanent RCC / masonry extension. The Steel sheets / temporary terrace covering do not meet this threshold.
If MC still issues notice you may issue a reply notice denying the allegations and you may demand PMC authorization / legal basis.
You may even approach the Deputy Registrar (Co-op Societies) for harassment or a Co-operative Court for injunction against selective action