A renovation goes well or badly long before anyone picks a paint color. It goes well or badly when you choose the firm.
Here is a number worth sitting with. In 2025, CASE logged 787 complaints against renovation contractors in Singapore, down from 962 the year before. Prepayment losses in that same category fell from about S$728,814 to roughly S$190,667. That is a real improvement, and it happened because homeowners got more careful about who they hand money to and when. It did not happen because the industry fixed itself.
So the vetting still falls to you. What follows is the part I can speak to as a designer, which is how to read a firm, a portfolio, and a proposal, plus the paperwork layer Singapore adds on top. Those are two different jobs and most homeowners only do one of them.
First, know which of the three you are actually hiring
People use these titles loosely and then get surprised by what shows up.
An interior designer handles layout, materials, and the look of the thing, and usually coordinates the subcontractors on your behalf. A contractor does the physical work. For an HDB flat, that contractor has to be listed in HDB's Directory of Renovation Contractors, and using one who isn't can bring a fine of up to $5,000. A design-build firm takes both jobs under one contract, which cuts down on finger-pointing and also cuts down on your leverage.
There is no universally correct answer. If you have a clear vision and want it protected through construction, the case for hiring a designer is strong. If you know exactly what you want built and mostly need it built well, a good contractor is the cheaper route.
Some scopes also require specific licenses no matter who you hire. Electrical work needs an EMA-licensed worker. Air-conditioner installation needs a BCA-registered installer. Structural work needs a Qualified Person, meaning a registered architect or professional engineer, who submits the building plans to BCA for approval before anyone starts.
The paperwork layer, by housing type
Get this settled in the first conversation, not the fourth. A firm that shrugs at approvals is telling you something.
HDB flats
Your contractor must be on the DRC list. Noisy work, meaning hacking, tile-cutting, heavy drilling, is permitted only on weekdays between 9am and 5pm, and never on weekends, public holidays, or the eves of the major public holidays. General non-noisy work runs 9am to 6pm Monday through Saturday, with nothing on Sundays or public holidays. Permit fees change, so ask who files and who pays rather than assuming.
Condominiums and strata units
Read your MCST house rules before you read a single quote. They are often stricter than the national rules on hours, lift protection, and deposits. Internal work that doesn't add floor area generally doesn't need planning permission. But if the work increases gross floor area, the URA application has to include a letter from the management corporation confirming it has authorised the work by a 90% resolution, which is a much higher bar than most people expect and a much slower one.
Worth knowing before you fall in love with a plan that moves a wall. Plenty of condos can be transformed without touching one, and high-end finishes and a few statement pieces will do more for a unit than a layout change that needs 90% of your neighbours to agree.
Landed and private homes
Structural changes and additions usually pull in URA planning permission and BCA plan approval. Bring the Qualified Person in early. Approvals are the part of the timeline nobody pads for, and a QP engaged at the last minute cannot fix a design that was never going to be approvable.
Building a shortlist worth your time
Portfolios, site visits, and neutral reviews. In that order. Advertising tells you who has a budget, not who has taste.
Directories are useful for the first pass because they put portfolios and homeowner feedback in one place, which is faster than opening thirty tabs. If you're comparing Singapore interior design firms before you start booking consultations, that's a reasonable place to start narrowing. What a directory can't tell you is whether the firm is any good, so treat a listing as a lead and nothing more.
What I look for when I read reviews isn't the star rating. It's whether the same complaint shows up three times. One unhappy client is life. Three clients describing the same communication failure is a process problem, and process problems do not improve on your project.
The credentials that mean something
DRC listing for HDB work. CaseTrust accreditation for the firm. SIDAC accreditation for the individual designer. bizSAFE if the scope warrants it.
CaseTrust is the one doing real work for you. Accredited firms have to carry a deposit performance bond, bill progressively, and use the CaseTrust Standard Renovation Contract. That is not a badge, it is a set of financial safeguards aimed squarely at the failure that produced those prepayment losses. CASE is pushing to accredit 500 renovation contractors with subsidies covering up to 80% of the cost, so the pool is growing and there's less reason to skip it than there used to be.
The red flags run the other way and they are consistent everywhere I've worked. Vague scopes. Timelines that are suspiciously short. Pressure to prepay a large sum. A refusal to visit the site before quoting, which is a refusal to be held to the number. Contracts with no milestones in them.
Make them all quote the same scope
Three quotes for three different scopes is three pieces of useless information. Write the scope once, hand the same document to everybody, and ask each of them to price it.
A proposal you can actually evaluate names the deliverables, drawings, material schedules, shop drawings. It carries an itemised bill of quantities with real brands or stated allowances. It gives lead times and says how often someone will be on site. It states defect liability and warranty terms. It has a written variation-order process, and a timeline showing the critical path through hacking, wet works, and carpentry.
An allowance of "quality tile, $80/sqm" is not a specification. It is a placeholder for an argument you'll have in month three.
Money, tied to work
Use CaseTrust standard terms where you can. Ask for proof of deposit protection. Pay progressively, and hold back a final tranche until defects are cleared.
Tie payments to work you can look at, not to dates on a calendar. Dates arrive whether or not the carpentry does. And put approvals in writing, all of them, including the ones given verbally on site. If it comes to a dispute, the paper is the whole case, and your escalation path runs through CASE, mediation, and potentially the Small Claims Tribunals.
Set the budget before you set the scope. Renovation costs and design fees are separate conversations, and knowing roughly what a designer's fee looks like keeps the second one from ambushing the first.
The part nobody screens for
All of the above keeps you safe. None of it makes you happy. Compliance is the floor, not the goal.
When you look at a portfolio, don't look for pretty. Look for a project shaped like yours, at your scale, with your constraints, and then ask who ran it day to day. The name on the door is frequently not the person on your site.
Then ask about function before finishes. The firms I trust settle circulation, outlet positions, and storage before anybody opens a tile sample, because function and beauty were never a trade-off. A designer who leads with a mood board and works backward to your daily routine has the order reversed.
One more thing, and it's the hardest part of this whole process. Figure out what you actually love, as opposed to what you think you should love. Those are different, and the gap between them is where most regretted renovations live. Houses should be lived in and every room should be enjoyed, which means the test isn't whether the finished space photographs well. It's whether you relax in it.
If you hire a firm without accreditation
You might get flexibility, a better price, or a designer whose eye is worth the risk. What you give up is the standard contract and the deposit bond, and you should know you're giving them up rather than discover it later. Verify the credentials the firm does have, get the milestones written down, and keep more money on your side of the table for longer.
FAQ
Do HDB renovation contractors have to be registered?
Yes. For HDB flat renovations the contractor must appear in HDB's Directory of Renovation Contractors, and noisy work has to stay inside HDB's permitted days and hours. Using an unlisted contractor can bring a fine of up to $5,000.
Does a condo renovation need MCST approval?
Usually. Check the by-laws and house rules before work starts, particularly on working hours, lift protection, deposits, and anything touching common property. Work that increases gross floor area also needs the management corporation's 90% resolution letter for the URA submission.
Should I pay a large deposit up front?
No. CASE and CaseTrust guidance both point to deposit protection and milestone-based progressive payments. A firm that needs most of the contract value before verifiable work exists is asking you to carry its cash-flow risk.
Designer or contractor for a first renovation?
If you can describe exactly what you want built, a good contractor will build it. If you can't, a designer earns the fee in the decisions you don't yet know you have to make, and in catching the ones that are expensive to reverse.
