Downsizing to a compact flat — resale questions for Chandigarh

Secondary market deals in Mullanpur Garibdass, are they genuinely better for all-in costs? Kids have moved out, so we're selling our big house and just want a manageable 2BHK flat. Log kehte hain resale mein negotiation zyada hoti hai, but hidden charges ka darr hai. Any tips on what to look out for beyond registration and stamp duty?