Solar for Condo Penthouses in Singapore

Not automatically, and this is worth settling before a penthouse owner spends any time on quotes. Singapore's own Court of Appeal has already tested the exact assumption behind the question, in a case about a penthouse roof reachable from nowhere else in the building.

• A roof stays common property under Singapore law whenever it's capable of being used or enjoyed by more than one unit, not only when it's physically shared.
• Sit Kwong Lam v MCST Plan No 2645 [2018] confirmed this for a penthouse's own roof, reachable only from that unit, with no other access point.
• Whether your specific roof is different comes down to the strata title plan, not the word "penthouse" on your listing.
• If the roof is common property, the path forward is the same MCST ordinary resolution process every other strata home uses.

Doesn't owning the penthouse mean the roof above it is mine?

A penthouse's roof isn't yours by default, even when you're the only person who can physically get to it. The Building Maintenance and Strata Management Act defines common property broadly: any area that isn't part of an individual owner's own lot, and that's capable of being used or enjoyed by occupiers of two or more units, counts as common property.

The Court of Appeal has ruled that "capable of being enjoyed" doesn't require anyone else to actually set foot there. A roof's mere presence above the building, visible and part of the shared structure, can be enough on its own.

What did the actual court case involve?

A penthouse owner on the 30th floor of a Singapore condominium built timber decking, carried out other roof works, and installed an air-conditioning unit on the flat roof above his own unit, without getting management approval first. He argued the roof was effectively his, since only his unit could reach it.

The Court of Appeal disagreed. The roof was accessible to other subsidiary proprietors through a common staircase, and under the statutory test, that made it common property regardless of who actually used the access. The owner was found to have made unauthorised alterations to property that wasn't his to modify alone.

So what actually decides who the roof belongs to?

Two conditions, both of which have to be true for an area to count as common property: it isn't comprised within any individual lot, and it's used or capable of being used by occupiers of two or more lots. If either condition fails, the classification changes.

A small number of strata developments do draw their title plans so that a penthouse's roof sits entirely within that unit's own lot boundary, or gets designated as "limited common property" for that unit's exclusive use. Neither is the norm, but neither is impossible.

What if the strata title plan doesn't clearly say either way?

An ambiguous strata title plan does happen, and Singapore has a specific forum for exactly this dispute: the Strata Titles Boards, set up under the same Act to rule on classification and other common-property disagreements between an owner and their MCST before either side needs to go to the High Court.

A Board's ruling on whether a specific roof counts as common property, limited common property, or part of an owner's lot is binding, which makes it a genuine last resort if a strata title plan reads ambiguously and the MCST and owner can't agree on a reading.

How do I actually find out which situation I'm in?

Request your strata title plan and share certificate from your MCST's managing agent or council secretary. Every subsidiary proprietor is entitled to see these, and asking for them costs nothing.

The plan shows your unit's lot boundaries as surveyed and registered, and anything sitting outside that boundary defaults to common property unless a specific clause says otherwise. Guessing from the fact that you bought a "penthouse" gets this wrong more often than it gets it right, which is exactly what the 2018 case turned on.

What if the roof genuinely does turn out to be my own lot?

A roof confirmed as the penthouse's own lot puts you in one of the more workable strata micro-cases available, closer in practice to a landed homeowner's decision than to the rest of your building's. You'd still need BCA structural loading sign-off and a licensed installer, same as anyone.

One thing worth confirming directly with SP Group before assuming too much: whether your unit carries its own individual electricity account, separate from the building's shared supply, since that's what actually determines whether exported solar can earn Simplified Credit Treatment. A private roof lot doesn't automatically come with a private meter.

And if it's common property, like most are?

A roof confirmed as common property works the same way it does for any strata development: nothing goes up without an ordinary resolution passed at an AGM or EGM, and the whole MCST shares in that decision, not just the unit with the best access.

The full mechanics, timelines, and the export-credit limitation that typically comes with master-sub-metered buildings are covered in Sunnify's strata and cluster home solar guide, which applies here without modification. Being the penthouse doesn't shorten that process or change the vote you need.

What's the actual next step?

Get the strata title plan before you get a quote, since that single document settles who actually owns the roof, something the address on the listing never could. If your roof is genuinely your own, run the Sunnify solar estimate the same way a landed homeowner would.

If it's common property, the strata and cluster home guide covers exactly what an MCST proposal needs to succeed. And if your building is a walk-up rather than a tower, the same lot-boundary check applies, covered in Sunnify's guide to solar for walk-up apartments.