How many windows are there in New York City?
Google- Whitney Chard
Estimate the number of windows in Delhi?
? Clarifying Questions and Assumptions
- We are considering the Windows of buildings and not that of any kind of Vehicles.
- We are considering the windows of residential buildings and not that of any workplace, hotel, or Hostels.
- Defining windows to be normal windows and not that space for air circulation.
- Considering 2 parts of the window to be 1 window.
? Approach and Calculations
- The population of Delhi is 3 crore.
- Assuming the number of family members is 4, therefore, the number of families = 75 lakhs.
- Now assuming some people own their own house and not flat. Since Delhi is a metropolitan city I think that this number could be around 20% of the total population. Therefore making the population flat/rentals to be = 60 Lakhs
- Now dividing it based on Income. Assuming the Ratio to be the same as that of India
- High Class (10%)
- Upper Middle Class (20%)
- Lower Middle Class (30%)
- Low Class (40%)
- Now defining the types of flats and average windows in each flat
- 3bhk ? 3 bedrooms, 1 hall, 1 kitchen ? 6 windows. Considering each bedroom has 1 window, the kitchen has 1 window for ventilation and the hall has 2 windows.
- 2bhk ? 2 bedrooms, 1 hall, 1 kitchen ? 5 windows. Considering each bedroom has 1 window, the kitchen has 1 window for ventilation and the hall has 2 windows.
- 1bhk ? 1 bedroom, 1 hall, 1 kitchen ? 3 windows. Considering each bedroom has 1 window, the kitchen has 1 window for ventilation and the hall has 1 window.
- 1RK ? 1 hall cum bedroom, 1 kitchen ? 2 windows. Considering each bedroom has 1 window, the kitchen has 1 window for ventilation.
3BHK2BHK1BHK1RKTotal Windows
| High Class = 6 lakhs | 30% = 1.8 lakhs family | 70% = 4.2 lakhs family | 0% | 0% | 1.8 * 6 + 4.2 * 5 = 32 lakhs |
| Upper Middle Class = 12 lakhs | 10% = 1.2 lakhs family | 80% = 9.6 lakhs family | 10% = 1.2 lakhs family | 0% | 1.2*6 + 9.6 * 5 +1.2 * 3 = 59 lakhs |
| Lower Middle Class = 18 lakhs | 0% | 0% | 50% = 9 lakhs family | 50% =9 lakhs family | 93 + 92 = 45 lakhs |
| Low Class = 24 lakhs | 0% | 0% | 0% | 100% = 24 lakhs | 24 * 2 = 48 lakhs |
| Total Windows | 184 lakh windows |
- Now assuming the number of windows in an average house:-
- Every house has 3 rooms for a family of 4, a guest room, dining room, Kitchen ? Number of windows 3 + 3 + 3. Let’s assume 10 windows on an average
- And assuming a family of 8 people in the house making it ? 7.5 lakhs family
- Number of windows for these families ? 7.5 lakhs*10 ? 75 lakhs windows
? Number of windows in the residential building = 2.6 crore windows