Help Corner

General Construction Work

Determine the Acceptable Noise Level (ANL)

Is the construction site located inside a Designated Area (DA)

Yes No

Type of area containing the Noise Sensitive Receiver (NSR)

(i) Rural area, including country parks or village type developments

(ii) Low density residential area consisting of low-rise or isolated high-rise developments

(iii) Urban area

(iv) Area other than those above

Degree to which the NSR is affected by industrial area or major road

Time period of construction work

All days during 1900-2300 hr, and general holiday during 0700-2300 hr.

All days during 2300-0700 hr.

Is the duration of the Construction Noise Permit (CNP) under application greater than 14 days

Yes No

Degree at which the NSR is affected by noise from nearby construction site with CNPs

Under
GW-TM

Under
DA-TM

ANL
dB(A)

ANL

dB(A)

Determine the total Sound Power Level of Powered Mechanical Equipment (PME)/Specified Powered Mechanical Equipment (SPME)
-
-	Items of standard PME to be used		No. of unit







-	Item of non-standard PME to be used	Sound Power Level	No. of unit

Total Sound Power Level dB(A)

SPME
Sound Power Level dB(A)

Determine the Corrected Noise Level (CNL) at the NSR
-	Distance between the nearest NSR facade (with windows, doors or opening) and Notional Source Position of PME		m
-	Effect of barrier / screening
		There is substantial barrier between NSR facade and all items of PMEs
		All noisy PMEs are totally screened when viewed from the NSR
		NSR is a building directly adjacent to the construction site such that none of the PMEs will be visible from NSR
		None
-	Will the noise level be increased due to the confined or reverberant nature of the immediate locality of the construction site or the NSR		Yes No

CNL at nearest NSR

dB(A)

CNL at nearest NSR

dB(A)

CNL - ANL=

dB(A)

If the CNL is greater than the ANL, a CNP shall not be issued unless it is a special case under the Technical Memorandum on Noise from Construction Work Other Than Percussive Piling (GW-TM) and Technical Memorandum on Noise from Construction Work in Designated Areas (DA-TM)
Note: All calculations above are for quick reference only. The issuance of the Construction Noise Permit shall be subject to the result of a thorough technical assessment in accordance with the procedures in the relevant Technical Memoranda.