"Surprisingly, NCR one of the worst-hit residential markets in recent years - has seen the least decline of merely 6 per cent during this period," he added.
The current average size of flats in NCR is nearly 1,390 sq ft.
MMR has the least average apartment size among all top cities, and also recorded the highest drop of 45 per cent from 960 sq ft in 2014 to 530 sq ft in 2019.
Pune registered 38 per cent reduction in sizes during this period, with the average apartment size currently at 600 sq ft.
Anarock said that the average sizes in both MMR and Pune are calculated on the carpet area while for the remaining cities it is based on the built-up area.
Chennai, Bengaluru and Hyderabad have seen size reduction of 8 per cent, 9 per cent and, 12 per cent, respectively, over the past five years.
The current average size of properties in Hyderabad (at 1,570 sq ft) is the maximum among the top seven cities. Similarly, the average size of properties in Bengaluru is also comparatively bigger at about 1,300 sq ft while in Chennai it is about 1,190 sq ft.
Meanwhile, Kolkata saw sizes reduce by 9 per cent over the past five years to 1,120 sq ft now against 1,230 sq ft in 2014.
"Among the major factors contributing to the escalating 'claustrophobia effect' of shrinking apartment sizes, demand for affordable homes in metros tops the list," Puri said.
Also, buyers are increasingly looking to avail the government's credit subsidy benefits for affordable housing. These require a home to be priced less than Rs 45 lakh and not exceed 60 sq mt carpet area or approximately 850 sq ft built-up area (including overall loading).
Moreover, the goods and services tax (GST) for affordable housing is one per cent as against five per cent for mid-segment homes.
"In short, buyers get reduced costs and added benefits, but lose out on space. Developers get to attract more buyers," he added.
On further analysis, Anarock said that affordable homes priced less than Rs 40 lakhs have seen the maximum decline in sizes over the previous years, while ultra-luxury homes saw the least.
Affordable homes priced less than Rs 40 lakhs saw average sizes reduced by 28 per cent - from 750 sq ft in 2014 to 540 sq ft in 2019.
Mid-segment apartments priced from Rs 40 lakhs to Rs 80 lakhs saw sizes reduced by 17 per cent - to 950 sq ft in 2019 from 1,150 sq ft in 2014.
Premium homes priced between Rs 80 lakhs to Rs 1.25 crore saw a 21 per cent reduction in sizes from 1,450 sq ft in 2014 to around 1,140 sq ft in 2019.
Luxury homes priced between Rs 1.5 crore to Rs 2.5 crore saw an 18 per cent reduction in average sizes - from 1,640 sq ft to 1,350 sq ft.
Ultra-luxury homes priced more than Rs 2.5 crore saw a mere 8 per cent decline in average sizes over the last five years from 2,400 sq ft in 2014 to around 2,200 sq ft in 2019.
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