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Introduced in the late 1960s, these 4-room HDB units were roughly 70 to 75 sqm. They were a massive step up from the 1- and 2-room emergency HDB flats, offering three bedrooms and a living area, but with very basic finishes and utility-focused layouts.
As the economy improved, HDB introduced the “New Generation” 4-room HDB flats, which grew to about 90 sqm. These were the first to feature “en-suite” master bathrooms (a toilet attached to the master bedroom), which was considered a significant luxury at the time.
Later in the 1980s, the 4-Room Model A became the gold standard, spanning roughly 100 to 110 sqm. They featured more generous kitchen spaces and separate dining areas.
Today’s 4-room BTO flats are typically standardised at 90 to 93 sqm (approx. 970 to 1,000 sq ft). While smaller than the Model A units of the 90s, they are designed with much higher space efficiency.
An interracial couple’s 4-room BTO renovation
This $45,000 renovation of a 1,001 sq ft 4-room HDB BTO flat serves as a vibrant “rojak” of cultures for newlywed interracial couple Nurul and Chen.
Eschewing structural hacking, the couple worked within the standard HDB footprint to create a Mid-Century Modern sanctuary that intentionally blends Chinese and Malay influences.
The design is a celebration of their shared journey—from their first meeting over a curry puff at the airport to their collaborative approach to homemaking, where Nurul took the lead on aesthetic decisions with Chen as her advisor.
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Modern Industrial 4-Room BTO Design
This $50,000 renovation of a 4-room HDB BTO flat at Skyville @ Dawson balances a modern industrial aesthetic with livable warmth.
Designed by Cynthia Liau of The Inside Job for newlyweds Royce Fam and Irene Li, the flat makes full use of its 23rd-floor position to highlight panoramic urban views.
The interior departs from a purely raw industrial look by incorporating wood-look laminates and an open-concept layout that ensures the living and dining areas feel spacious and welcoming rather than cold.
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A Retiree Uncle’s 4-Room HDB Renovation in Tampines
This $70,000 renovation of a 1,196 sq ft 4-room HDB flat in Tampines transforms a 35-year-old unit into a “back-to-basics” retirement sanctuary that doubles as a museum for a sprawling superhero toy collection.
The homeowner-designer, Calvin Ho, a creative entrepreneur, reconfigured the original 3-bedroom layout by knocking down one wall to create a bright, expansive living and dining area.
This open-plan space is grounded by engineered wood flooring in a herringbone pattern and features custom cabinetry specifically designed to showcase his curated selection of high-end figurines.
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One bedroom was opened up to become part of the living room. The spacious living and dining areas are where Miss Chew spends most of her time at home.
A lady’s $100,000 4-Room HDBDesign
This $100,000 renovation of a 1,254 sq ft 4-room HDB flat in Serangoon North Avenue 1 transforms a 40-year-old unit into a modern, neutral-toned sanctuary for a bachelorette and her dog.
Designed by Ovon Design, the project was strategically timed with HDB’s Home Improvement Programme (HIP) to address the flat’s aging infrastructure.
Having all the built-in cabinets, drawers and counter top on one side of the long and spacious kitchen keeps everything efficient and neat.
The most significant structural change involved opening up the third bedroom to enlarge the living area and combining the remaining two bedrooms into a massive master suite with a walk-in wardrobe, prioritising everyday comfort over underutilised guest spaces.
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$130,000 Retro 4-Room HDB Design
This $130,000 renovation of a 1,500 sq ft 3-bedroom resale HDB flat in Tampines is a wholesale transformation of a 24-year-old unit into an eclectic, “chapalang” sanctuary.
Designed by Gayle Leong of 3PSI for homeowners Jo Henson and Merlyn Hor, the project was a collaborative effort that prioritised storage and space-planning to accommodate the couple’s many hobbies and their love for entertaining.
The structural overhaul involved converting one bedroom into a massive walk-in wardrobe and expanding the master bathroom by repurposing space from the storeroom, resulting in a layout that feels both spacious and highly organised.
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