Aircon Installation for HDB Flats Singapore — from $2,200

Installing aircon in an HDB flat has rules that condos and landed homes do not — where the outdoor unit can sit, who is allowed to do the work, and how the piping is run. aircons.sg installs across BTO, resale and existing flats by BCA-licensed technicians who do it to HDB guidelines, so it is done right the first time. The quote you get is the price you pay.

HDB aircon installation pricing

System	Standard inverter	Premium (Daikin/Mitsubishi Electric)
System 2 (2 indoor + 1 outdoor) — typical 3-room flat	from $2,200	from $2,800
System 3 (3 indoor + 1 outdoor) — typical 4-room flat	from $2,800	from $3,300
System 4 (4 indoor + 1 outdoor) — 5-room / executive	from $3,500	from $4,500

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HDB aircon installation rules you should know

The outdoor condenser must sit on the flat's designated aircon ledge, on proper brackets — roof and common-corridor installation are not allowed in most blocks.
Work must be carried out by a BCA-licensed contractor; DIY or unlicensed installation can breach HDB rules and void manufacturer warranties.
Piping is run neatly along approved routes, trunked where it is visible for a clean finish.
Older flats may need an electrical isolator or a dedicated point added — we check this at the survey.
We work to these guidelines as standard, so your installation passes without compliance headaches.

Which system does your flat need?

The right configuration depends on how many rooms you want cooled, not just the flat size. As a starting point we confirm at the free site survey:

3-room flat — usually a System 2 (two bedrooms, or one bedroom plus living room).
4-room flat — usually a System 3 (two to three bedrooms plus living room).
5-room / executive — System 3 or System 4 depending on whether the living and dining areas are cooled.
Bedroom units are typically 9,000–12,000 BTU; living/dining areas 18,000–24,000 BTU. We size each room properly so nothing is under- or over-powered.

What's included in the price

Free site survey and BTU recommendation
Indoor and outdoor unit mounting on proper HDB ledge brackets
Insulated copper refrigerant piping (standard length) and drainage piping
Electrical wiring and isolator connection
Vacuum, leak test and correct gas charge
Full system performance test on every unit
Removal and disposal of your old units, on request
1-year installation warranty, plus the manufacturer's warranty on the units

Extra copper piping beyond the standard run, concealed trunking, or a new electrical point are quoted upfront on the survey — never added afterwards.

Our HDB installation process, step by step

Free site survey — we check your rooms, ledge, power and piping routes, and recommend the system size.
You choose the brand and system; we give a clear, final quote.
On installation day we mount the indoor units and the outdoor condenser on proper ledge brackets.
Insulated copper piping and drainage are run along approved routes and trunked where visible.
Electrical wiring and the isolator are connected to specification.
The system is vacuumed, leak-tested and gas-charged correctly — the step cheap installers most often rush.
We test every unit, confirm cooling, and remove your old units if requested.

BTO, resale or existing flat

BTO: new flats usually need the full piping run, brackets and points installed from scratch. We time the work around your renovation so trunking and false-ceiling work line up neatly.

Resale: we can reuse sound existing piping where it meets standard, or replace ageing copper and brackets — the survey tells us which is worth keeping.

Existing flat upgrade: replacing an old system is straightforward; we remove and dispose of the old units and install the new system to current guidelines.

Frequently asked questions

Do I need HDB approval to install aircon?

For HDB flats you must engage a BCA-licensed contractor and follow HDB rules on outdoor unit placement — condenser units sit on the designated aircon ledge with proper brackets, never on the roof or common corridor in most blocks. We handle the compliance so the installation is done correctly the first time.

How much does aircon installation cost for a HDB flat?

As a guide: a System 2 (2 indoor units) from $2,200, a System 3 from $2,800, and a System 4 from $3,500. Premium brands such as Daikin and Mitsubishi Electric are priced higher — System 2 from $2,800, System 3 from $3,300 and System 4 from $4,500. The quote is final.

Which aircon system do I need for my HDB flat?

A rough guide: a 3-room flat usually suits a System 2, a 4-room a System 3, and a 5-room or executive flat a System 3 or 4 depending on whether you cool the living room as well as the bedrooms. We confirm the right configuration at the free site survey.

Can you install aircon in a new BTO?

Yes. New BTOs often need the full piping run and brackets installed from scratch. We handle BTO, resale and existing-flat installations, and time the job around any renovation so trunking and ceiling work line up neatly.

How long does HDB aircon installation take?

A System 3 or System 4 in a typical HDB flat is usually a full day, including mounting, piping, wiring, vacuum, gas charge and testing. We give a precise timeline after the free site survey.

Do you supply the aircon or do I buy it?

Either works. We can supply units at competitive pricing across Daikin, Mitsubishi Electric, Panasonic, LG and Midea, or install units you have already bought. The installation workmanship carries a 1-year warranty either way.

Do I need to inform my town council before installation?

For standard ledge installations following HDB guidelines, a licensed contractor handles the job within the rules. If any external or visible works fall outside the norm, we advise you before starting so there are no compliance surprises.

Other aircon services we offer

Aircon Installation (all property types) — from $1,200
Aircon Servicing — from $25/unit
Aircon Chemical Wash — from $135
Aircon Chemical Overhaul — from $200
Aircon Repair & Gas Top-Up — from $45 incl. pre-check
Aircon Installation Cost — what the price includes and what can change it

Aircon Installation for HDB Flats in Singapore