HDB Interior Design Singapore: How to Pick a Firm

Choosing an HDB interior design Singapore partner decides how smooth your renovation runs. Since HDB only lets licensed contractors in its Directory of Renovation Contractors touch your flat, and permits take about two weeks to process, the firm you sign with controls your handover date more than your mood board does.

Check the licence before you check the portfolio

Every renovation in an HDB flat must be carried out by an HDB Licensed Renovation Contractor listed in the Directory of Renovation Contractors. This is not a nice-to-have. If the company you hire is not on that list, HDB will not issue a permit, and works done without one can be ordered reinstated at your cost.

Here is how I verify a firm in under fifteen minutes:

1. Ask for the exact registered company name and UEN, not the marketing name on Instagram. Many design studios operate under a parent entity.
2. Search that registered name in HDB's Directory of Renovation Contractors. Confirm the licence is active and not expired or suspended.
3. Ask which entity will apply for the HDB renovation permit. The licensed contractor applies, not you, and not a freelance designer.
4. Request a past permit approval from a recent job with the flat address blanked out. A firm that renovates HDB flats weekly can produce one immediately.
5. Ask whether the same licensed entity holds the workmanship warranty. Sometimes the design house subcontracts everything and the warranty sits with a party you never met.

A studio that hesitates at step three is telling you something. Walk.

Read the quotation like a contract, because it is one

Most disputes I see are not about taste. They are about a quotation that said "carpentry for kitchen" and nothing else. A usable quote is itemised down to the running foot, the material, and the finish.

Look for these line items and reject the quote if they are missing:

• Hacking scope, listed wall by wall, with a note that no load-bearing walls, beams, columns or slabs are touched. Structural elements cannot be hacked in an HDB flat.
• Carpentry measured in running feet, with the carcass material, door finish, hinge and runner brand, and internal layout stated. Laminate carpentry on a 20mm carcass is not the same product as 15mm.
• Electrical works counted by point. Ten new power points and four data points is a number. "Rewiring works" is not.
• Flooring by square foot, with the exact product. Vinyl and laminate are both accepted in HDB flats, but a 5mm SPC plank and a 2mm glue-down vinyl behave differently for the next ten years.
• Countertop material and thickness. Quartz and solid surface are the common approved choices, and a 20mm quartz slab with a mitred edge costs more than a 12mm one.
• Permit application fee, protection works, debris disposal, and final cleaning. These get dropped from cheap quotes and reappear as variation orders.

Ask every shortlisted firm to quote the same written scope. If one comes in S$8,000 lower, find the missing lines before you celebrate. In my experience the gap is almost always carpentry depth, hardware grade, or disposal trips.

Test them on schedule, noise rules and site discipline

A 4-room BTO fit-out typically runs eight to twelve weeks. A resale flat with full hacking and rewiring runs twelve to sixteen. Your BTO renovation timeline only holds if the firm respects HDB's noise window: noisy works such as hacking and drilling are allowed on weekdays between 9am and 6pm, and are not permitted on Sundays or public holidays. A contractor who promises to "catch up on Sunday" is planning to get you a complaint from the neighbour below.

Put these questions to the project manager, not the salesperson:

• How many active sites are you personally running this month? Above eight and your site visits become rare.
• What is the sequence after key collection, and which trade comes first? The correct answer starts with hacking and plumbing diversion, not carpentry.
• Who does the joint inspection with me before carpentry installation, and will you send weekly photos?
• How do you handle the household shelter? The correct answer is that the shelter door stays, the walls are untouched, and only light fittings and laminated flooring go in.
• If my flat is a newer BTO with a balcony, what is the plan? The correct answer is that the balcony stays unenclosed, because HDB does not allow enclosing it, and the design works with outdoor-rated finishes instead.

Firms that answer these crisply have done the work. Firms that redirect you back to renders have not.

Where HDB interior design firms differ by flat type and budget

Not every studio is good at every job. A team that mostly does condo units will underestimate how much carpentry an HDB flat needs to feel finished, because HDB layouts rely on built-ins to reclaim floor area. A 4-room flat sits around 90 sqm, a 5-room around 110 sqm, and a 3-room around 60 to 65 sqm. In a 3-room, the difference between a 600mm and a 450mm wardrobe depth changes how the corridor feels, which is the kind of HDB flat space saving judgement that only comes from repetition.

On money, use market ranges as your filter. A 4-room BTO renovation commonly lands between S$30,000 and S$45,000. A resale flat of the same size commonly lands between S$50,000 and S$70,000 because of hacking, rewiring, and replacing wet-area waterproofing. If a firm quotes S$22,000 for a full resale package, they have either excluded hacking and electrical or they intend to raise variation orders later.

Ask for two references from the last six months in the same flat type as yours. Call them and ask one question: what went wrong, and how was it fixed? Every project has a problem. The useful signal is the repair behaviour.

Sign only after these five documents exist

1. A dimensioned floor plan with every carpentry piece drawn and labelled, not a mood board.
2. An itemised quotation matching that plan line for line.
3. A payment schedule tied to completed milestones. A common structure is 10 percent on confirmation, then progressive payments on hacking completion, carpentry installation, and handover, with a final 5 to 10 percent held until defects are cleared.
4. A written defects liability period. Twelve months on workmanship is the standard to push for.
5. Confirmation that the licensed contractor will apply for the HDB renovation permit, with the application submitted at least two to three weeks before your intended start date.

Never pay a large deposit before the permit is applied for. And never let anyone start hacking on a "permit is coming" verbal assurance.

Good HDB interior design is a procurement exercise as much as a creative one. When one accountable team owns the layout, the carpentry, the electrical plan and the schedule, you stop being the middleman between six trades who blame each other. That is the real argument for a whole-house customization approach: one measured plan, one production line for your carpentry, one warranty, and a home where the wardrobe depth, the socket heights and the lighting circuits were decided together instead of patched together. If you are about to collect keys, get your layout and carpentry drawings settled first, and let the permit clock run while you finalise finishes.