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HDB BTO renovation, Singapore

BTO renovation in Singapore, priced and permitted properly

Every cost band on this site carries a date and a source. Every rule links to HDB. You get the scope, the permit path and the number before you commit.

  1. 01 PERMIT

    Hacking always
    needs one

    All demolition and hacking of walls, partial or complete, needs HDB’s prior written approval before anything starts.

    hdb.gov.sg · read 2026-08-31

  2. 02 HOURS

    Mon to Fri
    9am to 5pm

    Restricted works only. General works such as painting and screed run Monday to Saturday until 6pm.

    hdb.gov.sg · read 2026-08-31

  3. 03 DEADLINE

    3 months for
    a new block

    From the date the permit is granted. Existing blocks get 1 month.

    hdb.gov.sg · read 2026-08-31

What it costs

Sourced cost bands, not a guess

Published renovation costs for an HDB BTO flat vary far more than any single average suggests. The bands below are third-party datasets, each named and dated. They are ranges, not quotes: your number comes from a scope, and a scope comes from the flat.

BTO renovation cost by flat type n=3 bands · S$
  1. 3-room BTO S$25k to 50k
  2. 4-room BTO S$51k to 62k
  3. 5-room BTO S$40k to 115k

Ranges as published by each source, not averaged together. Where two sources disagree, both are shown rather than reconciled.

Sources interiordiary.com.sg 2026-08-31qanvast.com 2026-08-31moneysmart.sg 2026-08-31

There is no 2-room row above because no source we hold publishes one. The 2 room BTO renovation page gives the itemised line costs that are documented instead.

How it runs

Four steps, and what HDB wants at each

  1. Scope and measure

    We walk the flat after key collection, measure every run, and write down what you want changed and what HDB will let you change.

    No charge Utilities account with SP Services must be open first

  2. Permit and drawings

    Your contractor files the electronic application. Wall demolition needs the flat’s floor plan submitted with it.

    HDB charges nothing for the permit itself Only a Directory of Renovation Contractors firm may file it

  3. Hacking and wet works

    Demolition, tiling and anything touching the bathroom happen first, inside the restricted-hours window.

    Making good the cut surfaces is a separate line Mon to Fri, 9am to 5pm only

  4. Carpentry and finish

    Kitchen and wardrobe carpentry is fabricated to a fixed specification, then installed, then painted.

    Usually the largest single line item Complete within 3 months of the permit on a new block

By flat type

Renovating a 2, 3, 4 or 5 room BTO

3 room BTO renovation: itemised cost, layout and scope 3 room bto renovation 3 room BTO renovation: itemised cost, layout and scope 4 room BTO renovation: real cost range, layout and scope 4 room bto renovation 4 room BTO renovation: real cost range, layout and scope 5 room BTO renovation: cost, layout and reclaiming corridor space 5 room bto renovation 5 room BTO renovation: cost, layout and reclaiming corridor space 2 room BTO renovation: what fits, what it costs and what HDB restricts 2 room bto renovation 2 room BTO renovation: what fits, what it costs and what HDB restricts

The rules

What HDB allows, in plain words

Most of what decides a BTO renovation is not taste, it is the Housing and Development (Renovation Control) Rules 2006 and the guidelines under them. Only a firm on HDB’s Directory of Renovation Contractors may renovate your flat, and the penalty for using one that is not runs to a fine of up to S$5,000 on conviction, for the flat owner as well as the contractor.

Which works need a permit · When work is allowed to happen · What is banned outright

Guides

Before you commit to anything

HDB renovation permit: what needs one, who applies and how long it takes hdb renovation permit HDB renovation permit: what needs one, who applies and how long it takes HDB renovation time: permitted hours, quiet days and completion deadlines hdb renovation time HDB renovation time: permitted hours, quiet days and completion deadlines HDB Optional Component Scheme: should you opt in or opt out optional component scheme HDB Optional Component Scheme: should you opt in or opt out

Get a free quote

Tell us the flat and when you collect keys. We reply within one working day with a scope discussion and an indicative cost band.

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Checked against primary sources · updated 2026-08-31