Hidden costs in Ghaziabad property nobody talks about

Visited some projects in Ghaziabad last weekend, especially around Madhuban Bapudham. Gulmohar greens ka ek project bhi dekha. Builder ne jo price quote kiya, usmein toh bahut kuch missing hai. Matlab, registration, stamp duty, interior, society maintenance ka fund… I had no idea it’d be so much extra! Yeh sab costs pehle se kaise factor karein? What else am I missing jo builder nahi batayega? Koi checklist hai kya for first-time buyers? Ab samajh nahi aa raha ki total budget kaise banayein. Has anyone faced this hidden cost shocker?