My neighbour is building a new house right next to my boundary wall, their pillars are practically touching my wall. Is this allowed in India? What are the rules about boundary walls? Can I stop them? How?

Under Indian law, your neighbor cannot build their pillars touching your boundary wall. They must maintain a minimum distance from your property line, as per local building regulations. You can legally object to this construction, and if they don’t comply, you can file a complaint with the relevant authorities, potentially leading to a court order to stop the construction.