Every year I get calls from condo owners who have already engaged a contractor, sometimes already started hacking, before finding out that their renovation needs approval from the management corporation. It usually ends in delays, extra costs, or having to reinstate work that was never allowed in the first place. Condo renovation is not like HDB renovation. You are not just dealing with HDB’s rules, you are dealing with a private management corporation strata title, or MCST, that governs the whole building and every owner in it. If you have just collected keys, are planning an addition and alteration project, or are buying a resale unit and wondering what past owners may have changed without permission, this is what I would want you to know before your contractor arrives.
Why condo renovation rules are fundamentally different from HDB
In an HDB flat, the rules come from one source, the Housing and Development Board, and they are largely uniform across the country. In a condo, every development has its own management corporation, formed under the Building Maintenance and Strata Management Act, and this MCST has its own by-laws on top of a baseline set out in the Second Schedule of the Act. Two condos next to each other can have quite different rules on things like flooring materials, working hours, or what counts as common property.
The key concept to understand is the difference between your unit and common property. Your unit is generally what is within the internal wall surfaces, but items like external walls, structural columns, balconies in some developments, aircon ledges, bay windows, and the roof are often common property even though they sit right next to or within your unit. Any work that touches common property, even something as simple as installing an aircon compressor bracket or enclosing a balcony, technically requires MCST approval, not just a renovation permit from your managing agent.
What typically needs approval, and what doesn’t
Cosmetic works like repainting internal walls, changing light fittings, or swapping out wardrobes usually do not need MCST sign-off, though your managing agent will still want advance notice for lift booking and access. Once you move into structural or common property territory, the requirements tighten considerably. Hacking of internal partition walls needs a structural engineer’s endorsement in most developments, because even non-load-bearing walls sometimes conceal services that affect neighbouring units.
Bathroom and kitchen works involving waterproofing are treated seriously almost everywhere, because a failed waterproofing membrane on a high floor can cause water seepage into the unit below, and disputes over seepage are among the most common and most expensive complaints MCSTs deal with. Many management corporations require a mandatory ponding test before you close up newly waterproofed areas, and some require photographic evidence submitted as part of the permit application. Flooring changes, especially replacing carpet or vinyl with marble or timber on higher floors, often trigger impact insulation requirements because of how sound travels between units in a concrete structure. Window and gate replacements facing the building’s exterior are usually restricted to approved designs, since they affect the building’s external appearance, which the MCST has a duty to maintain uniformly.
The approval process, deposits and what it actually costs in time
Most condos require you to submit renovation plans to the managing agent, sometimes with a registered contractor’s details, insurance coverage, and a method statement for any hacking or waterproofing work. A renovation deposit, commonly somewhere between five hundred and a few thousand dollars depending on the scope, is collected and refunded after a post-renovation inspection confirms no damage to common property, lifts, or corridors. This deposit is separate from anything you pay your contractor and is meant to protect the building, not to fund your project.
Approval timelines vary. Simple permits for non-structural work can be turned around within a few working days. Anything touching structural elements, waterproofing, or the building facade may need to go through the MCST council or a renovation sub-committee, which typically meets monthly, so factor that into your project timeline rather than assuming approval on demand. Renovation is also usually restricted to specific days and hours, commonly weekdays and Saturday mornings, with noisy or hacking work further restricted to protect residents’ quiet enjoyment, particularly in developments with a high proportion of owner-occupiers.
Common pitfalls, and what buying a resale unit doesn’t tell you
One issue I see often with resale condos is inheriting a previous owner’s unauthorised works. A balcony enclosed without approval, an aircon ledge converted into usable floor area, or a bay window built over without proper waterproofing can all become your problem the moment you take ownership, because the MCST’s obligation to maintain common property does not disappear just because ownership of the unit changed hands. If a defect surfaces or the MCST later enforces its by-laws, the current owner is typically the one required to reinstate the work, regardless of who did it originally.
This is why, when I advise buyers on resale condo purchases, I encourage them to ask the seller’s agent directly whether any past renovations required MCST approval and whether that approval was obtained and documented. It is also worth requesting a copy of the condo’s house rules or by-laws before your renovation planning goes too far, since some restrictions, such as prohibitions on marble flooring above a certain floor or restrictions on gas hob installations in certain units, are specific to the building and not something a generic renovation checklist will catch. A short conversation with the managing agent before you commit to a design can save weeks of rework later.
Getting the sequence right before you start
My general advice to owners starting a renovation is to treat MCST approval as the first step, not an afterthought squeezed in after the contractor has already been engaged. Get the by-laws, confirm what counts as common property in your specific development, and have your contractor submit method statements for anything involving hacking, waterproofing, or structural elements before signing off on a final design. It is a slower process than HDB renovation in some respects, but it exists to protect every owner in the building, including you, from the kind of seepage disputes and structural issues that are far more costly to fix after the fact.
If you are weighing up a resale purchase and want a clearer picture of what has or hasn’t been altered in a unit, or you are about to start planning your own renovation and want to understand a specific development’s by-laws before committing to a design, I am happy to help you think it through.
If you have questions about a condo purchase, an upcoming renovation, or want a second opinion on a unit’s history before you commit, feel free to reach out to me on WhatsApp or drop me a message. No pressure, just a straightforward conversation.