Aircon Ledge: Common Property or Part of Your Own Lot

Nobody else can step onto your aircon ledge, and that settles nothing about who owns it. Three true things get mistaken for a boundary. Only your unit opens onto it, only your equipment stands on it, and only you pay to keep that equipment running. None of the three is a title, and together they describe a habit rather than a right.

The general shape is simple, and the exceptions are where owners get caught. What sits inside a lot is generally the owner's, and looking after it falls to the owner. What sits outside is usually common property, which the corporation maintains. Some things standing inside a lot are still common property by definition, including structural elements and the ducts that serve more than one unit.

The ledge is where this bites hardest, because it sits right on the seam. It lies outside your walls, and nobody else can reach it. It carries your machine, and it forms part of the building's outer shape. Two estates on the same road can answer differently, and neither is mistaken.

What a management corporation is, and where its powers come from, is a separate subject, covered by the guide on what an MCST is. That guide also sets out how common property is defined in general terms. HDB flats have no management corporation at all, and shared property in an HDB estate sits with the town council instead. For a flat, read the guide on HDB aircon ledge problems.

Your development's strata title plan settles the boundary. It is registered with the Singapore Land Authority and marks out what falls inside a lot. BCA's guidance for owners puts it directly: an owner identifies common property by referring to that plan. A copy can be bought from SLA, and there is a fee for it.

The management office should be able to answer from the plan without you buying a copy. BCA's worked example deals with grilles and louvres rather than ledges, and it splits the job between both sides. If the feature falls within the plan, maintaining it is the owner's. The office, in turn, is expected to read the plan and keep a record of what it found.

An office that has never written the answer down will improvise it, and improvised answers move when the officer moves. Ask for a determination taken from the plan, not a view. Then ask where that determination is filed.

Three things move with the answer, and one does not. Approval, repair of the platform, and access for building work all shift. The exception is any opening cut through the external wall. The outer face and the structure behind it are shared in nearly every development, so that part needs approval either way.

Approval is the first thing to change. If the ledge falls inside the lot, changing what stands on it runs into the by-laws on works, hours and appearance. BCA states the rule plainly: an owner cannot alter or change common property without the corporation's approval. The same holds where a job unavoidably uses common property, such as anchor points landing on an external wall.

Repair of the platform is a separate bill from repair of the machine. Spalling concrete, a failing finish or a corroded railing on a common property ledge is estate work, funded through the contributions every owner pays. The same defect inside a lot falls to the owner of that lot.

Access changes in a quieter way. Common property leaves the corporation with a standing reason to be there, since facade cycles, painting and repairs to shared structure all reach the ledge. Equipment sitting on it may have to be worked around or moved for that. Inside a lot, the reasons to come in are narrower, and how anyone safely reaches a high ledge is a separate question.

Separate the slab, the bracket and the machine before asking who answers for what. They are three objects, and one plan can give them three different answers. Owners picture a single thing called the ledge, which is why the answer feels contradictory when it arrives.

The machine is the owner's in every version of this. BCA is explicit for units inside a lot: maintaining the air-conditioning units and their supporting systems falls to the owner. Nothing about the boundary changes that.

The bracket is the part most people never think about; the exterior-features rules treat it as a feature in its own right. A metal or concrete bracket fixed to the building and to externally mounted equipment counts, and so does a similar supporting frame. Those rules define that equipment to include an air conditioning unit and its condensing equipment. The frame under your condenser has a standing of its own, apart from the slab and the machine.

Exterior features carry an upkeep duty, and that duty follows whoever answers for the feature. BCA describes that person as the owner of the building it is installed on, or whoever has daily charge of managing and maintaining it. Its own split, offered as non-exhaustive, places the supporting system of an air-conditioning unit on the owner's side; the list carries the same caveat as this page, that it depends on the strata title plan. Penalties sit behind the duty where a feature or its support falls because nothing was kept up.

A third answer sits between yours and the estate's. A management corporation can make a by-law giving an owner exclusive use and enjoyment of part of the common property, or special privileges over it. Conditions can be written into that by-law, including payments. The part stays common property throughout; what moves is who may use it, and on what terms.

How long the arrangement runs decides how hard it is to pass. An arrangement of under a year needs an ordinary resolution, and one running between one and three years needs a special resolution. Anything longer than three years needs a ninety per cent resolution. A lasting arrangement is therefore the hardest kind to create, and few estates hold one for condensers.

An exclusive use by-law does not move the boundary. The plan is untouched, and the allocated part is still common property. It also does not follow from an approval letter. Permission to install and a by-law conferring exclusive use are different instruments, made by different means, and neither is evidence of the other.

Where ordinary use of common property ends, and exclusive use begins, is a question of fact. Legal commentary notes that the line has not been drawn consistently. Treat any confident general answer with care. In practice, most condensers standing on common property here rest on approval and long habit rather than on a by-law of that kind.

Collect these answers in writing before the work is booked. Keep them with the unit's records rather than in a chat thread.

• •Which side of the lot boundary the ledge falls on, answered from the plan rather than from memory
• •Whether any exclusive use by-law attaches to that ledge, and its conditions
• •Who the office records as answerable for the platform, and who for the brackets holding the condenser
• •What making good means if brackets are moved or new holes are needed
• •Where all of that is filed, so the next officer and owner get the same answer