Here's how you can approach negotiating the price for your desired 4-BHK duplex apartment:
Before Negotiation:
Research: Check similar projects in the area and their pricing for 4-BHK duplexes. This will give you a benchmark for negotiation.
Feasibility: Confirm with the builder if combining two 2-BHK flats into a 4-BHK duplex is structurally possible. Get this confirmation in writing. There might be limitations due to load-bearing walls etc.
Negotiation Points:
Bulk Purchase Discount: Highlight that you're purchasing two units, generating a larger sale for them. Request a discount for this bulk purchase.
Double Charges for Amenities: Point out that you're essentially paying double for amenities like water, STP, power backup, etc., by buying two flats. Negotiate a combined rate for these considering the shared usage.
Structural Changes: Negotiate for the builder to absorb some or all the cost of structural changes needed for combining the flats. This is because it saves them the cost of finishing another separate unit.
Payment Terms: If possible, offer a faster payment turnaround in exchange for a better price. This incentivizes the builder to close the deal quickly.
Alternative: Express willingness to walk away if negotiations aren't satisfactory. However, ensure you have explored other options and are genuinely prepared to do so.
Reaching Your Budget:
With your budget of 1.6-1.7 Crore, aim for a price per square foot lower than the quoted 7000/sqft for the flats.
Negotiate a combined price for the two flats that falls within your budget, considering the saved amenity charges and potential discount for structural changes.