9 Best HDB BTO Interior Design Firms in Singapore (August 2026)

Before the list, the checks that matter most for a new flat. Start with registration: whoever renovates your BTO must be on the HDB Directory of Registered Renovation Contractors, because only registered contractors are allowed to carry out renovation works in HDB flats. It takes two minutes to check and it is non-negotiable.

Next, deposit protection. BTO renovations usually run on staged payments, so I look for firms under the CaseTrust-RCMA accreditation scheme, which requires a standard renovation contract and a deposit-protection arrangement. For a first-timer handing over money in stages to a firm you met a month ago, that safety net is worth a lot.

After the paperwork, three things separate the good BTO firms. Package transparency: the best ones give you an itemised quote so you can see what the carpentry, flooring and electrical each cost, rather than a single scary number. Carpentry quality: since built-ins eat most of a BTO budget, in-house or certified carpentry (Blum hinges and runners are a good sign) makes a real difference. And first-timer handling: reviews that mention patient guidance, clear timelines and no last-minute cost surprises matter more than glossy portfolio shots. Because so much rides on your specific flat type and budget, treat this as a shortlist to interview, not a ranking to obey.

For a new BTO the money goes mostly into carpentry, built-ins, flooring and finishes rather than hacking, so costs track closely with flat size and how much custom carpentry you want. Here are the ballpark design-and-renovation ranges I would budget for in 2026. These exclude furniture and appliances.

The single biggest lever is carpentry. A wall of custom wardrobes, a full-height kitchen and built-in feature units can add tens of thousands, while keeping built-ins lean is the fastest way to bring a BTO budget down. Always get an itemised quote so you can see exactly what is driving your number.

Here is the shortlist in one view, by what each firm does best for a new flat.

I weight Qanvast reviews that describe the process and timeline, cross-check HDB renovation-contractor registration and CaseTrust-RCMA accreditation, and favour firms with genuine BTO packages and in-house carpentry. Ratings and details were accurate when I wrote this but they move, so confirm the current picture with each firm before you sign. I update the list when my view changes.

It depends on how much design help you want. A renovation contractor executes the works, hacking, tiling, carpentry, electrical, but usually without a dedicated design service. An interior design firm plans the look, layout and carpentry, then manages the trades to deliver it. For a first BTO, most people benefit from a firm that does both, because the layout and built-in decisions are where a flat is won or lost. Whichever you choose, the firm doing the physical works must be on the HDB register of renovation contractors.

Earlier than most people think. I would start meeting firms two to three months before key collection, so you can compare quotes, lock in a designer and have works begin soon after you get the keys. Good BTO firms book up, especially around major key-collection periods, so leaving it until after collection often means waiting weeks for a slot. Getting your quotes and design direction sorted early also spreads out the decisions rather than cramming them into a stressful few weeks.

For a typical BTO, the renovation itself usually runs about 8 to 12 weeks once works start, on top of a few weeks for design finalisation and material selection. Heavy custom carpentry, imported materials or a larger flat can push it longer. Build in a buffer and do not schedule your move-in for the exact day the renovation is promised to finish, because a week or two of slippage is common even with good firms.

It is a strong plus, especially for first-timers. CaseTrust-RCMA accredited firms must use a standard renovation contract and provide deposit protection, which matters when you are paying a firm in stages for a flat that does not exist yet. It is not the only thing that makes a firm good, plenty of excellent designers focus on portfolio and reviews, but if you want the extra financial safety net, prioritise an accredited firm. You can check accreditation on the CaseTrust renovation scheme listing.