You are advised to check your block's electrical loading before the air-conditioner installation. Alternatively, you can also call our toll-free Branch Office Service Line on 1800-2255432.

Types of Electrical Work	Need Permit?
Installation of air-con (window unit, split unit and casement type) using existing approved 15 Amps power point or 20 Amps isolator provided by flat owner or HDB	No
Installation of air-con (window unit, split unit and casement type) using new 15 Amps power point or new 20 Amps isolator	Yes. You need to apply for a electrical permit for a 15 Amps power point/20 Amps isolator before you can carry out the air-con installation

Flat Type	Max. Total Running Current Allowed	AirCon Condensing Unit Max. Weight Allowed
1/2 room	5 Amps	80 kg
3/4/5-room/ Multi-Generation	8.5 Amps	80 kg
Exec Apt (with 4 bedrooms)	8.5 Amps	80 kg
Exec Apt (with 5 bedrooms in converted block)	11 Amps	80 kg

Types of Electrical Work	Need Permit?
Installation of air-con (window unit, split unit and casement type) using existing approved 15 Amps power point or 20 Amps isolator provided by flat owner or HDB	No
Installation of air-con (window unit, split unit and casement type) using new 15 Amps power point or new 20 Amps isolator	No

• No control on running current of electrical appliances, but to be restricted by 20amps DP isolator or 15amps power point
• No restriction on number of casement/window unit air-conditioners
• Maximum of 2 split-type air-conditioner condensing units (maximum weight of 110 kg each) are allowed to be installed externally
• For wall mounted air-con condensing units, each wall panel is allowed to mount only 1 air-con condensing unit

Flat owner shall be responsible for the proper installation, safety and stability of the air-con (casement/window unit/split type).

1. Air-con must be installed only by a BCA trained air-con installer
2. To submit the SP Services Ltd (SPSL) Form CS/5H endorsed by HDB to SPSL for testing of the new wiring
3. For Air-con mounted on the outside of the flat, flat owner is required to submit the installation report to the HDB Branch Office managing their flat within 14 days after installation. Alternatively, the flat owner can email the installation report to the HDB Branch Office managing their flat



1. Method of installation/location of air conditioner window unit and split type condensing unit (including the condensed water discharge pipe) must be in accordance with the approved location and method of installation. You may verify with the Branch Office managing your flat for the approved location and appropriate installation method
2. All piping for the air conditioner must be run internally
3. Air-con window unit and/or split type air-con condensing unit (ACU) are not allowed to be located along the common corridor
4. Flat owner shall ensure the air-con installer insulates all air-con pipes joints to prevent condensation/dripping of water
5. Condensation water must be properly discharged into a nearby internal floor trap
6. Upon completion of the installation work, flat owner and the air conditioner installer shall verify and ensure the running current of the air conditioner does not exceed the approved electrical rating
7. Air-con (casement/window unit/split type) must not cause any vibration in the building and rubber padding should be provided at the base of the air-con condensing unit (ACU)
8. No hacking of holes or openings through existing reinforced concrete structures within the unit
9. No embedment of air-con pipe in reinforced concrete slab, column and reinforced concrete beams
10. For pre-cast facade with tiles, a single opening of 50mm x 50mm per panel for the running of refrigerant pipe is allowed. However the flat owner/tenant must ensure that the air-conditioner installer checks the wall tiles surrounding the location of the opening for the bolts and refrigerant pipes are not delaminated. Any delaminated tiles have to be removed
11. To safeguard the public, air-con installer has to ensure that safety precautions are taken during the installation



1. Flat owner shall, at his own expense, maintain the external wall face free from stains at all times
2. Flat owner shall, at his own expense, maintain the air-con at all times to avoid causing any inconvenience or nuisance to nearby occupants
3. Flat owner shall abate any nuisance should it arise, failing which, he may be required by HDB to stop the use of or remove the air-conditioner



1. The Town Council has imposed the following conditions for flats with air-conditioner ledge:

• Flat owner shall:
  • Not tamper with the air-con ledge which is part of the common properly maintained and managed by the Town Council, and
  • Ensure that air-con ledge is kept clean and free from of obstruction at all times
• Air-con ledge is only to be used for placing of ACU and nothing else
• Flat owner shall grant HDB, Town Council, other Government authorities and their authorised persons the right of entry into the premises to carry out routine checking and maintenance work to the air-con ledge

No tray or receptacle should be placed beneath and/or on top of any air-conditioning unit so as not to create a condition favourable for mosquito breeding. NEA may take legal action against anyone who creates a condition favourable to the breeding of mosquitoes.

Last Updated on 19 Jan 2010