Search for “HDB aircon installation report” and you will find guides that cannot agree on what the form is called, where it goes, or who sends it. We install aircons in HDB flats every single day and file these reports as part of the job, so here is the accurate version, based on HDB’s actual published requirements rather than guesswork.
The short version
When a trained installer installs or replaces an air conditioning unit in your HDB flat, an installation report must be completed and sent to the HDB Branch managing your flat within 14 days of the installation. A proper installer handles this as part of the job. That is the whole obligation. Everything else you may have read, permits for every flat, uploading forms through My HDBPage, jail terms, is either only true in specific cases or simply wrong.
First, check which category your flat is in
HDB’s rules split flats by their electrical supply, and this changes what applies to you.
Flats with a 40 amps main switch, and flats upgraded under MUP or HIP: no permit is needed for aircon installation works at all. The installation still has to follow HDB’s guidelines, and the installation report still applies, but there is no approval to apply for beforehand.
Flats with a 30 amps main switch: these are typically older blocks, and the electrical loading of your aircon system matters. There are specific requirements on what can be installed, which is exactly the kind of thing your installer confirms during the site survey before quoting. This is one of the reasons we do site surveys in the first place: the answer depends on your flat, not on a generic article.
Not sure which you have? Open your DB box door and look at the main switch rating, or just send us a photo on WhatsApp and we will tell you.
Who must do the installation
HDB requires that installation or replacement of condensing units is carried out by air conditioner installers trained by the BCA, the Building and Construction Authority. This is not paperwork for its own sake. Condensing units hang on external walls and ledges above public spaces, and the trained installer requirement exists because a badly mounted compressor is a genuine safety hazard. All our installation teams meet this requirement, and it is worth asking any installer you engage to confirm theirs do too.
The installation report itself
The official document is Form AC-02, titled the Air-Conditioning Unit Installation Report for HDB Properties, and it is addressed to the Commissioner of Building Control. You can download the current form here (PDF, dated 28 March 2024), or get it directly from HDB. Some guides also mention a “Form ACP”, which does not exist on any current HDB document.
The report records your flat address, the installer’s details and training credentials, what was installed, and how, including the type of support used. It is completed by the trained installer, and it must reach the HDB Branch managing your flat within 14 days of installation. HDB accepts it by email to your managing branch, which is how it is usually done today.
Who actually submits it
The installer completes the technical sections because only they can certify how the unit was mounted. Any installer doing HDB work regularly will file the report as a routine part of the job, and at Lion City this is included with every installation, you do not need to ask. As the flat owner you remain responsible for the installation complying with HDB’s requirements, so the one thing worth doing is simple: ask your installer to confirm the report has been filed, and keep a copy. It is useful evidence of a compliant installation if you ever renovate, sell, or need to make an insurance claim.
What happens if it is never filed
Honestly: for most flat owners, nothing dramatic happens on day 15. But an unfiled report means an undocumented installation, and that surfaces at the worst times. If HDB queries the installation, if a downstairs neighbour reports a leak, or if an incident involves your condensing unit, the first question is whether the installation was done by a trained installer and documented. Non compliant installations can be required to be rectified or removed at your cost. The report costs nothing and takes minutes. There is no good reason to skip it.
Questions we get on this
Does replacing my old aircon with a new one need a report? Yes. Installation and replacement of condensing units both fall under the trained installer requirement, and a new installation means a new report.
Do I need HDB approval before installing? If your flat has a 40 amps main switch or was upgraded under MUP or HIP, no permit is needed. For 30 amps flats, requirements apply, and your installer should sort this out with you before any work starts, not after.
My installer never mentioned any report. Should I worry? It is worth asking them directly whether they filed it. If the answer is vague, that tells you something about the rest of the installation too.
Does this apply to condos? No. This is an HDB requirement. Condos have their own rules set by the MCST, which we covered in our condo aircon installation rules guide.
The easy way to get this right
Choose an installer who treats HDB compliance as part of the job rather than an extra. Every Lion City installation in an HDB flat includes the site survey, trained installation teams, proper mounting on the ledge or approved brackets, and the installation report filed with your managing HDB Branch. You get the copy for your records without asking. See how we install on our installation page, browse installed prices in our shop, or WhatsApp us at +65 8818 5781 with your floor plan and we will handle the rest, paperwork included.
Sources: HDB renovation guidelines for air conditioner installation works and HDB’s Form AC-02 installation report, both on hdb.gov.sg. Requirements current as of August 2026, check HDB’s website for the latest version.
