Learn from other peoples Interior Design nightmares through reading these articles on blacklisted interior design firms right here in Singapore and not fall prey to one of them. Always be cautious about the interior design firm you are about to engage. Choosing an interior designer that is not reputable is a costly affair.
Google is your best friend. Always check on their reviews on Social Media (Facebook, Forums, Interior Design Portals) and how long they have been in business. There are various interior design groups for home owners on Facebook that you can engage with to learn more about their experiences.