4-Room BTO Renovation in Singapore

A new 4-room BTO flat is close to a blank slate, so most of the budget goes into building the home up: flooring, kitchen and bedroom carpentry, painting, electrical work and the wet areas. Cost ranges below are third-party 2026 planning estimates, not Form & Space quotations or guaranteed prices. Obtain an itemised quotation for your own scope, including applicable GST and exclusions.

Form & Space is an HDB-registered renovation contractor with a valid HDB licence. We design the flat, make the carpentry in our own factory, and run the site as one team. If you would like a quotation based on your floor plan, get in touch.

What a 4-room BTO renovation typically costs in 2026

Industry guides put a typical 4-room BTO renovation in Singapore at roughly S$50,000 to S$70,000 in 2026. Two widely read sources publish slightly different ranges for a new 4-room flat:

Source	4-room BTO / new flat (2026)
Qanvast	S$50,000 to S$60,000
MoneySmart	S$51,000 to S$70,000

Typical market ranges quoted by Qanvast (February 2026) and MoneySmart (2026), as summarised in our HDB renovation cost guide. These are not Form & Space prices. Where you land depends on the length of carpentry, the kitchen and bathrooms, flooring, and how much layout change the plan needs. Use the figures to frame an initial budget, then compare itemised quotations on the same scope.

Typical scope of works

Because a new BTO is handed over with little built-in furniture, a full 4-room renovation usually covers most of the rooms rather than a single upgrade. A typical scope includes:

Flooring throughout the living areas and bedrooms, once any levelling or screeding is done. Replacing floor finishes needs an HDB permit.
Kitchen carpentry — cabinets, a worktop, sink and tap, plus plumbing and electrical points planned around how you cook.
Bedroom storage — full-height wardrobes and, where useful, a study or storeroom cabinet.
Other built-ins such as a TV console, shoe cabinet and service-yard or laundry storage. Built-in carpentry is usually one of the largest items in an HDB budget.
Painting, lighting and extra electrical points. New flats often arrive with a minimal socket count, so points and lighting are easier to plan before the carpentry is drawn.
Bathrooms — in a newly built BTO, HDB does not allow the original toilet wall and floor finishes to be removed for 3 years, to protect the waterproofing. Overlaying new tiles is often the practical option in those first years; replacing the finishes later needs a permit.
Optional layout or feature works, such as a partition, feature wall or ceiling, only where the walls allow it. Structural walls and the household shelter cannot be hacked or drilled.

Smart-home wiring, lighting scenes and extra data or power points should be settled at design stage, before the cabinets go in and the ceilings close. Every flat is different, so the reliable list is one drawn from your own floor plan and must-haves, not a standard package.

HDB rules and permits

You must use a contractor listed in HDB’s Directory of Renovation Contractors. That contractor applies online for the renovation permit on your behalf. Obtain the necessary permit before starting works that require approval. Our HDB renovation permit guide sets out the process in full. In short:

A permit is typically needed for hacking or building walls, replacing floor finishes, raising floors in wet areas, moving internal doorways, and replacing toilet finishes after the 3-year restriction.
Structural reinforced concrete walls, columns, beams and slabs must not be hacked. The walls of the household shelter must not be hacked or drilled, and its steel door must not be tampered with.
Window replacement must be done by a BCA Approved Window Contractor listed with HDB. A main door on a fire escape route must be half-hour fire-rated, with a door closer, and replacing it needs a permit.
Give written notice to neighbours within a radius of 2 units at least 5 days before work begins, and display the Notice of Renovation outside the flat throughout the works.

HDB allows general renovation from 9am to 6pm, Monday to Saturday, and noisy work such as hacking or tile cutting only from 9am to 5pm on weekdays. No renovation is allowed on Sundays and public holidays. Noisy work is also not allowed on the eves of New Year’s Day, Chinese New Year, Deepavali, Hari Raya Puasa and Christmas Day.

HDB’s guidance states that approved works must be completed within 3 months for new flats. Follow the specific completion period and conditions in your permit. Form & Space is an HDB-registered renovation contractor with a valid HDB licence, and we submit the permit application for the works we carry out.

From key collection to move-in

The on-site build is only part of the journey. Design, defects inspection and the HDB permit all sit around it, and they need to be planned in sequence.

Before key collection. HDB’s MyNiceHome renovation guide advises you to start thinking about your theme and sourcing an interior designer or contractor before your key collection date, because the creative process takes time.
Inspect and report defects first. New BTO flats have a 1-year Defects Liability Period from the key collection date. You must report defects within 30 days of key collection, and before renovation works begin. MyNiceHome notes that defect repair work typically takes less than two weeks. Once renovation has started, it becomes much harder to tell whether a mark was left by the building contractor or the renovation team.
Settle the design and the quotation. We visit the flat, take measurements and prepare space plans, 3D views and a line-by-line quotation. There is no standard Form & Space package price; the quote follows your floor plan and agreed scope, with materials named so you can compare fairly.
Apply for the HDB permit. We submit the application as your listed contractor. Allow time for evaluation rather than assuming approval is immediate, and only start permit-controlled works once the permit is in hand. Neighbours still need at least 5 days’ written notice.
Build. Qanvast’s 2026 estimates put a 4-room renovation at roughly 8 to 10 weeks for both BTO and resale flats. These are market estimates, not permission to exceed HDB’s approved work period of 3 months for new flats. Ask us to distinguish design, fabrication and deliveries from the permit-controlled works on site.
Handover. We do a joint inspection, attend to defects and hand over a warranty you can hold us to, including the smart-home system once you are living with it.

How Form & Space works

We are a design-and-build studio, founded in Singapore in 2011. The same team is responsible for the drawings and for what arrives on site.

In-house carpentry. Kitchen cabinets, wardrobes and feature joinery are made in our own factory in Johor, Malaysia, to our shop drawings — checked before they ship, and installed by our own team. What is specified is what gets installed, and when something needs to change on site it can change in days, not weeks.
Smart home at drawing stage. We work closely with Aqara and Near, and plan lighting scenes, climate, blinds, access and sensors before a single conduit is laid, rather than retrofitting once the ceilings are closed.
One programme, one manager. After consultation and design, you receive a line-by-line quote and a programme. Site works are run by one project manager you can call, through to handover and after-sales support.

We also specify and install imported modular kitchens and wardrobes from Brun SG and modular+ where they suit the plan, coordinated with the carpentry and site work around them.

Some of our HDB projects

These completed HDB homes show how we work within HDB’s rules. They are not all 4-room BTO flats, and they are not quotations for a new job, but they give a sense of the carpentry, layouts and finishes we build.

Blk 8 Boon Keng (completed 2025) — a warm grey, walnut and brass palette, with a marble waterfall kitchen island, built-in laundry nook and a desert-print bedroom.
Blk 951 Hougang (completed 2022) — an industrial loft look, with raw concrete walls, a carved timber scripture sliding door and a compact home climbing wall.
Blk 447 Bright Hill Drive, Bishan (a 5-room HDB, completed 2023) — a modern heritage scheme with breeze-block screens, a Peranakan-inspired kitchen and calm, well-planned storage.

You can browse more work in our HDB project archive.

Frequently asked questions

How much does a 4-room BTO renovation cost in 2026?

Industry guides put a typical 4-room BTO renovation at roughly S$50,000 to S$70,000. Qanvast’s 2026 range for a new 4-room flat is S$50,000 to S$60,000; MoneySmart’s is S$51,000 to S$70,000. Your own cost depends on scope, materials and the length of carpentry. These figures are planning estimates, not a Form & Space quotation. See our HDB renovation cost guide for the full table and what drives the number up or down.

Do I need an HDB permit to renovate a new 4-room BTO?

Yes, for many common items, including replacing floor finishes, hacking or building walls, and moving internal doorways. Your contractor must be listed in HDB’s Directory of Renovation Contractors and applies for the permit on your behalf. Read the permit guide for the full list, the 3-year toilet rule, work hours and neighbour-notice requirements.

How long does a 4-room BTO renovation take?

Qanvast’s 2026 estimates put a 4-room renovation at roughly 8 to 10 weeks on site. That does not include design time, the 30-day defects-reporting window after key collection, or HDB permit approval. Approved works in a new flat must also be finished within HDB’s 3-month completion period, or the period stated in your permit.

Can I hack the toilet tiles in my new BTO flat?

Not in the first 3 years. HDB does not allow the original toilet wall and floor finishes in newly built flats to be removed during that period, to protect the waterproofing. You can lay new tiles over the existing ones instead, subject to HDB’s conditions. After 3 years, replacing them needs a permit.

Does Form & Space offer a fixed 4-room BTO renovation package?

No. We quote from your floor plan and an agreed, itemised scope, with materials named, rather than a published package price. That makes it easier to compare quotations fairly and to include only the work you actually need.

Planning a 4-room BTO renovation?

Tell us about the flat and when you collect the keys. We will visit, work through the layout and prepare a line-by-line quotation.

Call +65 6904 6996, message us on WhatsApp, or send a note through our enquiry page.

Form & Space is an HDB-registered renovation contractor with a valid HDB licence. Studio and showroom: 55 Lorong L Telok Kurau #02-57 Bright Centre, Singapore 425500.