Neighbour Interference In Building Repair Work

We own the first floor of a double-storey property with roof rights in West Delhi. The ground floor of the said property is owned by a different family, but the house has been unoccupied for years now. We have to initiate the renovation because the house was built in 1970s, and is now falling apart. The ground floor is locked, and neighbours do not cooperate. All we need is access to the veranda to repair foundation pillars. Considering that we already have written approval from SDMC that pillar repair work comes under Clause No. 2.14 of “Building Permit Not Required”, and a previous court ruling allowing us to do authorised construction on our respective floors, if we start repair work through their veranda, without entering into their house, can that be deemed trespassing.