NEA boundary noise limits in Singapore, explained
Every industrial premises in Singapore has a legal noise limit measured at its property boundary, not at the machine. Here's what the regulation actually requires, and how it's assessed.
AWhat the regulation covers
Boundary noise from factory premises is regulated under the Environmental Protection and Management (Boundary Noise Limits for Factory Premises) Regulations, administered by the National Environment Agency (NEA). The limit is set at the boundary of the affected premises — the property next door, not your own — and varies by what kind of premises that neighbour is and what time of day it is.
This is a different framework from construction noise control (which covers temporary works) and from workplace noise exposure (a worker-safety standard enforced separately) — boundary noise limits apply to the ongoing operating noise of a factory or industrial premises.
BThe actual limits
NEA publishes permissible noise levels as an equivalent continuous noise level over a 5-minute measurement, broken down by the type of premises affected and the time of day:
| Affected premises | Day (7am–7pm) | Evening (7pm–11pm) | Night (11pm–7am) |
|---|---|---|---|
| Noise-sensitive (e.g. hospitals, schools) | 65 dBA | 60 dBA | 55 dBA |
| Residential | 70 dBA | 65 dBA | 60 dBA |
| Commercial | 75 dBA | 70 dBA | 65 dBA |
| Factory | 75 dBA | 70 dBA | 65 dBA |
The lower limit at night reflects that the same physical noise level is more disruptive outside working hours — a factory backing onto a residential block has to control its noise significantly more tightly after 11pm than during the day. See NEA's own industrial noise control page for the full regulatory detail.
CHow compliance is assessed
Compliance is checked by measuring actual sound pressure levels at the affected boundary, not by inspecting equipment specifications. That means the same machinery can be compliant on one site and non-compliant on another, depending on distance to the boundary, intervening structures, and what's on the other side of the fence. A desk-based estimate is not a substitute for a real measurement.
If a boundary measurement exceeds the applicable limit, NEA can issue directions requiring the operator to reduce the noise, with escalating enforcement for continued non-compliance.
The limit that applies to you is set by your neighbour, not by you: a factory whose noise reaches a residential boundary must meet the residential limit — not the higher factory-to-factory limit — even if the site itself is zoned industrial.
Frequently asked
What is the actual regulation that sets these limits?
The Environmental Protection and Management (Boundary Noise Limits for Factory Premises) Regulations, enforced by NEA. It sets permissible noise levels measured at the boundary of the affected premises, not at the source.
Do the limits change at night?
Yes — every premises category has a lower limit in the evening (7pm-11pm) and a lower limit again at night (11pm-7am) than during the day (7am-7pm), reflecting that the same noise level is more disruptive outside working hours.
Which limit applies to my factory?
The limit that applies is set by the type of premises your noise affects, not by your own premises type — a factory whose noise reaches a residential boundary must meet the residential limit, not the (higher) factory-to-factory limit.
What happens if a boundary measurement exceeds the limit?
NEA can issue directions to reduce the noise, and continued non-compliance can lead to enforcement action. The practical fix is source-level attenuation (duct silencers, enclosures, vibration isolation) verified by a follow-up boundary measurement, not a one-off adjustment.