4-Room vs 5-Room HDB Renovation Cost in Singapore (2026)

Choosing between a 4-room and a 5-room flat changes your renovation budget, but less than most people expect. This guide compares the 4 room HDB renovation cost with a 5-room flat, for both BTO and resale, using the ranges Singapore renovation guides quoted in 2026.

These are indicative ranges for a standard specification. Quotes vary by firm, scope and finishes.

4-room HDB renovation cost vs 5-room: the price ranges

A 4-room flat is roughly 90 square metres and a 5-room roughly 110, so the 5-room has around a fifth more floor area. Yet at the low end of the BTO range the gap is only about S$5,000, and at the high end about S$12,000.

Why a bigger flat is not proportionally more expensive

Some of the biggest costs are fixed per flat, not per square metre:

• Both usually have one kitchen and two bathrooms to rebuild, and these are the most technical, costly rooms.
• Electrical distribution, plumbing connections and permits do not double with floor area.
• The extra space in a 5-room is mostly more flooring, painting and a larger living or bedroom area, which cost less per square metre than kitchens and bathrooms.

Where a 5-room does cost more is carpentry (more wardrobes, a larger TV feature and bigger kitchen runs), tiling and painting area, and extra lighting and electrical points.

How specification changes the number

For a 4-room flat, guides commonly describe three tiers:

Moving from standard to premium usually adds more than moving from a 4-room to a 5-room does. Your choices matter more than the flat type.

What drives your final quote

1. Custom carpentry: wardrobes, shoe cabinets, feature walls and kitchen cabinets are usually the largest single item.
2. Hacking and layout changes: removing a non-structural wall adds demolition, rebuilding and permit work. See the HDB renovation rules.
3. Resale condition: older flats often need rewiring, new pipes and re-waterproofing. Read resale HDB renovation hidden costs.
4. Wet areas: the kitchen and bathrooms. See the HDB kitchen and bathroom cost guides.
5. Finishes: tile grade, countertop material, fittings and lighting.

How to budget for either

• Decide your maximum budget, then ask designers what it realistically buys.
• Keep a 10-15% buffer, more for resale flats.
• Get three itemised quotes for the same brief so you compare scope, not just totals.
• If the budget is tight, spend on the kitchen, bathrooms and carpentry you will use daily, and defer decorative extras.

See our full HDB renovation cost guide and compare HDB interior designers on Layered.

Frequently asked questions

How much more does a 5-room renovation cost than a 4-room?

For a standard BTO, ranges quoted in 2026 suggest roughly S$5,000 to S$12,000 more. Kitchens, bathrooms and permits are similar, so the difference is mostly extra carpentry, tiling and painting.

Is a resale 4-room cheaper to renovate than a BTO 5-room?

Not usually. A resale 4-room (about S$55,000 to S$75,000) often costs as much as or more than a BTO 5-room (about S$45,000 to S$67,000) because of hacking, rewiring and re-waterproofing.

What is a realistic budget for a 4-room BTO?

Many homeowners spend between S$40,000 and S$55,000 for a standard specification, with a buffer on top.