HDB blocks completed on/ after 1 January 1994 or have undergone the Main Upgrading Programme (MUP)/ Home Improvement Programme (HIP) are provided with higher electrical loading of 40amps main switch.
If you are unsure of your block's electrical loading, you can use the Electrical Loading of Your HDB Block e-Service to check. You need not apply for a permit from HDB to install an air-conditioner or higher capacity electrical equipment/ appliances if your flat is provided with higher electrical loading.
You are responsible for the proper installation, safety, and stability of your air-conditioner (casement/ window unit/ split type).
The Town Council has imposed the following conditions for flats which have an air-conditioner installed on their ledge.
Check for the requirements and guidelines if your flat is provided with a 30 amps main switch.
Types of Electrical Work
Installation of air-conditioner (casement/ window unit/ split type) using an existing approved 15 amps power point or 20 amps isolator provided by flat owner or HDB
Installation of air-conditioner (casement/ window unit/ split type) using new 15 amps power point or new 20 amps isolator
Yes. You need to apply for an electrical permit for a 15 amps power point/ 20 amps isolator before you can have the air-conditioner installation carried out
Maximum Total Running Current Allowed
Air-Conditioner Condensing Unit - Maximum Allowed Weight
3/ 4/ 5-room/ Executive Masionette/ Multi-Generation
(with 4 bedrooms)
(with 5 bedrooms in converted block)
While this category of flats do not require a permit to carry out installation works, you should still familiarise yourself with the guidelines in place.
Guidelines Governing the Installation
Installation of air-conditioner (casement/ window unit/ split type) using existing approved 15 amps power point or 20 amps isolator provided by flat owner or HDB
The running current of air-conditioner should be restricted by a 20 amps double pole (DP) isolator or 15 amps power point
A maximum of 2 split-type air-conditioner condensing units can be installed
The maximum weight allowed is 110kg per wall panel regardless of whether the installation is on the external wall or air-conditioner ledge
For wall mounted air-conditioner condensing units, each wall panel is allowed to have only 1 air-conditioner condensing unit
Installation of air-conditioner (casement/ window unit/ split type) using new 15 Amps power point or new 20 Amps isolator
If you wish to change ownership of your flat without a sale (i.e. without monetary consideration), find out more about the types of ownership changes and the eligibility conditions.