So far this year, about 1,000 rooms have been added in these two major hospitality markets.
"Two prime markets in India, Delhi-NCR and Mumbai are expected to see an addition of 6,798 rooms by the end of 2015," Cushman & Wakefield said in a statement.
During 2014, Delhi-NCR and Mumbai hospitality markets have shown a downward trend in Average Occupancy Rate (AOR) whilst the Average Daily Rate (ADR) in both cities have recorded an increase of 2 per cent.
"Despite hopeful economic outlook on the table, supply- side growth may stifle gains in hotel performance in the short-term," it said.
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The consultant recently released its report 'Hotel Views' on year-end updates and forecast on the hotel markets across Asia and Australia covering over 18 gateway cities and prime destinations.
"Both Mumbai and NCR-Delhi are feeling the impact of supply-side growth that has outpaced the generation of demand. Over 11,000 keys and 16,000 keys are planned to enter the market between 2014 and 2018 for Mumbai and NCR Delhi respectively, significantly adding to rooms' inventory and placing pressure on potential gains in Occupancy and ADR," C&W said.
C&W Director, Hospitality India, PR Srinivas said: "The stability of the global market along with the strength of the Indian Rupee would be critical in assuring a healthier performance by these two gateway markets of India."
With a stable government at the centre actively promoting India as a destination, these two markets will be the likely beneficiaries of the expected traffic to India, he added.