| Primary value | 3.0 m |
| Applies to | All buildings — residential and non-residential |
| Exceptions | Plots < 9 m deep → Local DCR relaxation possible |
| Plots > 18 m height → Increases per side-setback rules | |
| Residential plots < 251 sq.m → 1.8 m (NBC 2016, Part 3, Table 5) | |
| High-rise buildings (>15 m height) → Minimum 6 m all-round open space may be required for fire tender access, superseding basic setback rules (NBC 2016, Part 4). | |
| Row/Cluster housing → Can be lower (e.g., 1.8 m) and side setbacks may be zero, as per approved layout plans. | |
| Non-residential buildings > 10 m height → Increases by 1 m for every 3 m of additional height, up to a max of 10 m setback (NBC 2016, Part 3, Table 6). | |
| Measured as | Perpendicular distance from the rear face of the building to the rear property boundary. |
| Source | NBC 2016 — Part 3, Clause 8.2.3 (Tables 5 & 6) ✓ Verified |
The rear open space is critical for providing natural light and ventilation to habitable rooms, especially kitchens and bedrooms, as mandated by NBC. It also creates a separation distance from adjacent properties for fire safety and privacy, and provides essential space for locating utility services like septic tanks, sewer inspection chambers, and air conditioning outdoor units.
In urban residential plots, the rear setback is typically used as a private utility yard. It commonly houses underground water sumps (UGT), septic tanks, and provides access for maintenance of drainage lines. For larger buildings, it may accommodate DG sets or transformer pads, subject to fire safety clearances.