Chapter 4
Site Planning & External Firefighting Provision
Chapter 4 governs the provision of space, roads, and infrastructure around buildings to enable effective external firefighting operations by SCDF. It sets out requirements for fire engine accessways and access roads (widths, gradients, turning facilities, loading), fire access openings in external walls, proximity to rising main breeching inlets, and private fire hydrant provision and water supply. The requirements scale with building Purpose Group, habitable height, and floor area.
Scope: All buildings requiring fire engine access in Singapore, covering Purpose Groups I–VIII. Specific provisions vary by PG classification, habitable height, accessible floor area (for PG III–VII) and gross cubical extent (for PG VI & VIII).
Source: SCDF Code of Practice for Fire Precautions in Buildings 2023. This is a guidance summary — always verify against the full Fire Code clause text.
Critical points
Every part of a fire engine accessway/access road must be within an unobstructed distance of 50m from a fire hydrant (public or private).
CriticalClause 4.4.1aPublic hydrants on one side of a road cannot serve developments on the other side of the road unless the road has at most two lanes regardless of traffic direction.
CriticalClause 4.4.1bBuildings requiring island-site fire engine accessway must have a ring (looped) fire hydrant pipe system, with isolation valves ensuring no more than one hydrant is out of service at any time.
CriticalClause 4.4.1ePrivate fire hydrants above reduced level 125m (where more than one hydrant is above RL125m in the same plot) must comply with wet rising main storage/pumping requirements per SS 575 and Table 4.4A.
CriticalClause 4.4.2b & 4.4.2cFire hydrant mains passing through buildings must be fire-resistance protected to the same standard as the structural element they pass through, located in common circulation areas, kept away from explosion-risk areas, and labelled 'FIRE HYDRANT MAIN' (min 50mm).
ImportantClause 4.4.3Siting and types of fire hydrants must comply with SS 575.
ImportantClause 4.4.1dA locking device shall keep all hydrant valves in the open position during normal operation; underground valves must remain open at all times.
ImportantClause 4.4.1f
Compliance thresholds
| Parameter | Value | Condition | Clause |
|---|---|---|---|
| Max unobstructed distance from any part of accessway/road to nearest fire hydrant | 50 m | All fire engine accessways and access roads | Clause 4.4.1a |
| Min diameter of private fire hydrant pipe and bulk water meter | 150 mm (nominal bore) | Private hydrant system receiving direct supply from public mains at RL ≤125m | Clause 4.4.2a.(1)(b) |
| Max AFA for direct mains supply without storage (PG III/IV/V/VII) | 1000 m² | Largest compartment AFA, PG III, IV, V & VII | Clause 4.4.2a.(1)(a) |
| Max AFA for direct mains supply without storage (PG VI & VIII) | 500 m² | Largest compartment AFA, PG VI & VIII | Clause 4.4.2a.(1)(a) |
| Min running pressure at most remote hydrant | > 2 bar | Where flow rate = 0.9× nearest public hydrant flow, direct supply path | Clause 4.4.2a.(1)(c)(ii) |
| Max pressure drop across bulk water meter | 1 bar | Private fire hydrant system | Clause 4.4.2a.(1) Note |
| Min flow rate — PG I & II hydrant | 27 L/s | PG I & II | Table 4.4A |
| Min water supply duration — PG I & II | 45 min | PG I & II | Table 4.4A |
| Min flow rate — covered car park (PG II/III/IV/V/VII) | 38 L/s | Covered car park, any AFA | Table 4.4A |
| Min flow rate — PG III/IV/V/VII, AFA ≤1000m² | 38 L/s | PG III, IV, V & VII, AFA ≤1000m² | Table 4.4A |
| Min flow rate — PG VI & VIII, AFA ≤500m² | 38 L/s | PG VI & VIII, AFA ≤500m² | Table 4.4A |
| Min water supply duration — PG VI & VIII | 90 min | PG VI & VIII (vs 45 min for other PGs) | Table 4.4A |
| Min running pressure at hydrant | 2 bar | All private fire hydrant systems (Table 4.4A) | Table 4.4A |
| Max diesel in day tank — outdoor emergency generator | 1000 litres | Outdoor emergency generator day tank | Clause 5.2.4b.(3) [referenced via Ch.4 context] |
| Dry private hydrant breeching inlet — max distance from accessway/road | 18 m | Dry private fire hydrant breeching inlet | Clause 4.4.2b.(3)(b) |
| Dry private hydrant — max distance from nearest wet hydrant | 50 m | Dry private fire hydrant | Clause 4.4.2b.(3)(b) |
| Dry private hydrant pipe diameter | 150 mm | Dry private hydrant connected to four-way breeching inlet | Clause 4.4.2b.(3)(a) |
Interactive decision tree
Assess private fire hydrant requirement