Resale HDB vs Condo Renovation: Rules in Singapore

Two homeowners renovating in the same month — one in a resale HDB flat, one in a condo — are actually working under two entirely different rulebooks, even if the renovation looks similar on a moodboard. Assuming the rules transfer from one property type to another is one of the most common, and costly, mistakes homeowners make. Here is what actually changes.

Who You’re Actually Asking Permission From

For HDB flats, there is a single national authority: HDB itself, with a standardised permit process and a Directory of Renovation Contractors (DRC) that every contractor must be listed on. For condos, there is no single national authority — each development has its own Management Corporation Strata Title (MCST), governed by the Building Maintenance and Strata Management Act, setting its own by-laws, deposits, and approval process.

What is permitted at one condominium may be refused at another a few streets away, which is why checking your specific MCST, not a general guide, is the only way to confirm what you can actually do.

Resale HDB: What’s Different From a BTO

• The 3-year bathroom wall and floor restriction that applies to new BTO flats typically does not apply. By the time you buy resale, that window has usually lapsed.
• Scope is often larger: old tiles, wiring and iron piping frequently need to be removed, and HDB mandates that iron pipes in resale flats be replaced with copper piping — this is not optional.
• A Single Line Diagram prepared by a Licensed Electrical Worker is a required part of the permit submission for resale renovations.
• Permits generally need a minimum 21-day lead time before hacking begins, with approval itself taking around 2–3 weeks.
• Hacking is typically limited to 3 consecutive days, with noisy works restricted to 9am–5pm on weekdays and a quiet hour from 1–2pm.
• Structural walls, reinforced concrete beams, columns and household shelters remain completely off-limits — no permit covers modifying these, regardless of flat type.
• Older resale flats sometimes carry unauthorised works from a previous owner, which may need to be reinstated before a new permit can be issued. Worth checking before you finalise your renovation budget.

Condo: What’s Different

• MCST approval replaces the HDB permit process, typically taking 2–4 weeks depending on the development.
• A refundable renovation deposit is standard. Commonly S$1,000–S$10,000 depending on the estate and scope, plus a separate non-refundable admin or permit fee of roughly S$200–S$500.
• Contractors need HDB licensing for basic works or BCA licensing for structural work, and MCSTs commonly require public liability insurance of at least S$1 million.
• Working hours vary by estate but commonly fall within 9am–5pm weekdays and 9am–1pm Saturday, with no work on Sundays or public holidays.
• Because you share walls, floors and ceilings with neighbours, works like wall hacking, waterproofing, electrical upgrades above 15 amps, and flooring changes that could affect the unit below all typically require approval — while cosmetic work like painting often does not.
• Protecting common property matters financially, not just as courtesy: your deposit is deducted for any damage to lifts, corridors or shared areas, refunded only after a joint inspection confirms none.

The One Mistake That Costs the Most

A homeowner at an East Coast condo once instructed a contractor to demolish a bathroom partition wall to create an ensuite — a straightforward request at many HDB flats. The MCST rejected the wet-wall demolition after the fact, and rectification plus the resulting delay cost the homeowner roughly S$18,000 and three months.

The lesson is not that condos are stricter across the board — it is that assuming the last home’s rules apply to this one is the single most expensive assumption you can make.

A Practical Checklist, Regardless of Property Type

• Confirm which authority actually governs your unit — HDB, or your specific development’s MCST.
• Confirm your contractor’s licensing matches your property type — HDB DRC listing, BCA registration, or both.
• Confirm permitted working hours and hacking windows before your schedule is finalised, not after.
• Budget for permit and deposit costs separately. These are frequently excluded from initial renovation quotes — our BTO renovation budget guide covers where the rest of the money goes.
• For condos, get your MCST’s by-laws in writing directly from the managing agent, not a verbal summary from your agent or contractor.
• Check what your renovation contract should include before you sign it.

Ace’s Design has run renovations across BTO, resale HDB and condo developments across Singapore since 2018, and manages the permit or MCST submission process as part of every project, so you are not the one chasing approvals mid-renovation. Once the rules are clear, ideas for your specific flat type are the next question — or get in touch for a property-specific renovation plan.