HDB Renovation Guide Singapore: Contractor vs ID Firm
This HDB Renovation Guide Singapore weighs up hiring a contractor against an interior design (ID) firm for your 2025 or 2026 flat. The takeaway is simple: contractors are cheaper and give you more control, but only firms listed on HDB's Directory of Renovation Contractors can legally file renovation permits. Pick the wrong help and your application gets bounced.
What a renovation contractor actually does
A contractor handles the physical works. Hacking, tiling, plumbing, rewiring, carpentry installation. They follow a plan you hand over, or a drawing you already have. You source the look yourself.
Most owners who know exactly what they want take this route. You speak straight to the people on site. No design fees, no mood boards, no slow debate about aesthetics.
- Lower fees, often 20 to 40 percent below an ID package.
- You own every design call and the weekly schedule.
- Best for resale flats where hacking and layout fixes are the main job.
What an interior design firm brings to the table
An ID firm plans the space, drafts the drawings, and coordinates the trades. They turn a bare 4-room into a finished home. You get one contact instead of chasing plumbers, tilers, and carpenters on your own.
The cost sits higher. A 4-room BTO package in 2025 ran S$30,000 to S$66,000, while resale hit S$50,000 to S$85,000. ID firms cluster at the top of that range because coordination is baked into the quote.
- Space planning and 3D drawings before a single wall moves.
- One contract covering carpentry, tiling, electrical, and plumbing.
- A project manager who handles defects through the warranty year.
Only DRC-listed firms can file your permit
This HDB Renovation Guide Singapore point trips up the most first-timers. Under HDB's Renovation Control Rules 2006, permit works must be carried out by contractors on the Directory of Renovation Contractors (DRC). That covers hacking non-structural walls, toilet tile changes, window and grille swaps, door repositioning, and rewiring beyond existing points.
Approval takes up to three weeks, or three to seven days for simple jobs. The permit stays valid for three months on a BTO flat and one month on a resale. Miss that window and you start the form again.
The cost and control trade-off
Here is the real maths. Carpentry eats roughly 40 percent of a typical budget. Electrical and plumbing take 25 percent. Tiling and flooring claim 20. Painting fills the last 15. An ID firm's design fee lands on top of all that.
With a contractor you keep that money but spend your own weekends. I have watched owners save S$8,000 to S$15,000 going contractor-direct, then burn two weeks of leave running the site.
How to decide for your flat
Go contractor if your layout is settled and you enjoy specs. Go ID firm if the flat needs reworking and you travel for work. Either way, check the DRC list before you sign anything.
Keep 10 to 15 percent of the budget as contingency. Resale flats throw surprises: hidden water stains, old wiring, uneven floors. The firm or contractor you pick should write their one-year defect warranty into the contract before works begin.
