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Hi,
Is it common to pay interior designers for design cost upfront and then get the quote based on materials we choose etc? One designer I narrowed is quoting this way. My dilemma is I would lose the design cost if i dont go with him based on his quotes.

also any reliable/quality interior designers in north bangalore, do provide reference

Design Cost & Execution cost are 2 separate things.

You can pay him the design cost and get the material break up details.

Simultaneously using the same design inputs, you can also take quotes from other carpenters/modular interior service providers also.
Later you can decide whom to reward the contract. Its not mandatory that you need to take quotes only with the designer suggested carpenter.