Planning a 4 room resale renovation in Singapore? 21 Interior Studio is a studio that provides useful renovation and interior design advice for resale HDBs. Whether you’re designing spaces, building custom storage, planning the kitchen, choosing lighting, flooring or finishes, it’s all possible to plan around your lifestyle. From a modern, minimalist look to a more timeless interior, thoughtful design can help you maximize your space and build a comfortable home. Explore renovation ideas, discover practical layouts, and get professional guidance to transform your 4-room resale flat into a beautiful and functional living space.