Bathroom renovation is among the most technically complex and cost-intensive scopes in any Singapore home renovation. It involves wet works, waterproofing, plumbing, electrical (for lighting, exhaust, and in some cases water heaters), and tiling — all compressed into a space that is, in a standard HDB flat, typically 4 to 7 square metres. Cost overruns in bathroom renovations are common, and they are almost always attributable to one of two causes: incomplete scope definition at quotation stage, or failure to address underlying waterproofing issues before tiling commences.
- Cosmetic refresh (fixtures only, no hacking): $2,500 – $5,000
- Mid-range renovation (full hack, tile, new fixtures): $7,000 – $12,000
- Premium full renovation (high-end tiles, fittings, rain shower): $14,000 – $25,000
- HDB master bathroom (larger, full renovation): $9,000 – $16,000
- HDB requires waterproofing to a minimum 1,800mm height on shower walls
Bathroom renovations reward homeowners who understand the scope before committing. The difference between a cosmetic refresh and a full gut renovation is not merely cosmetic — it reflects fundamentally different approaches to the longevity of the space. This guide walks through cost by scope, component-level pricing, the wet/dry works distinction, HDB’s waterproofing requirements, and what to demand from any contractor before signing.
Bathroom Renovation by Scope: Understanding the Spectrum
Cosmetic Refresh (No Hacking)
A cosmetic bathroom refresh involves replacing fixtures and fittings — toilet bowl, basin, tap, shower head, accessories — without any hacking of existing tiles. This scope is appropriate only when existing tiles are in sound condition with no cracking, hollow spots, or active leaks. A full fixture replacement with no hacking costs $2,500 to $5,000 for a standard HDB common bathroom, inclusive of labour and supply of mid-range fittings. This scope offers the lowest disruption and shortest timeline (typically 3 to 5 days) but provides no improvement to waterproofing integrity.
Partial Renovation (Floor Only or Feature Tile Replacement)
Some homeowners opt for partial renovations — for example, hacking and replacing only the floor tiles while retaining existing wall tiles, or replacing the shower wall tiles while leaving the floor intact. This approach is cost-effective in theory but carries a risk: partial hacking can disturb adjacent tile bonding, leading to hollow areas that subsequently crack or leak. If the existing tiles show any signs of hollowness (identifiable by tapping), a full hack is almost always more economical in the long run. A partial renovation costs $4,000 to $7,500 depending on scope.
Full Renovation (Complete Hack and Fitout)
A full bathroom renovation involves complete hacking of all existing floor and wall tiles, full application of new waterproofing membrane, new tiling throughout, replacement of all fixtures, and upgrade of lighting and electrical points where required. This is the only scope that provides a genuine reset of the bathroom’s waterproofing system — and in Singapore’s context, where leakage between floors is a common dispute between neighbours, proper waterproofing is not optional. A full mid-range renovation for a standard HDB common bathroom (4 to 5 sqm) costs $7,000 to $12,000. A full renovation for a master bathroom (5 to 7 sqm) costs $9,000 to $16,000 depending on specifications.
Bathroom Renovation Cost by Component
Hacking Works
Full hacking of floor and wall tiles in a standard HDB bathroom costs $1,200 to $2,500, depending on the number of existing tile layers and site access. Bathrooms with multiple layers of overlay tiles — common in older resale flats — cost more to hack and may require additional debris removal and surface preparation. Hacking generates significant noise and dust, and HDB restricts hacking to Monday to Saturday between 9:00am and 5:00pm (with a midday break on certain days in some HDB blocks).
Waterproofing
Waterproofing is the most critical and most frequently cut-cornered item in Singapore bathroom renovations. HDB requires waterproofing to a minimum height of 1,800mm on shower walls; reputable contractors apply membrane to the full height of wet area walls as best practice. Two-component cementitious waterproofing membrane — the standard commercial specification — costs $800 to $1,800 for a standard HDB bathroom. This is not a line item to economise on: a failed waterproofing membrane leads to leakage through the floor slab, potential structural damage, and disputes with the downstairs neighbour that can cost tens of thousands of dollars to resolve.
Tiling (Supply and Installation)
Tile supply and installation for a complete HDB bathroom (floor and walls) costs $2,500 to $5,500, depending on tile size, format, and the complexity of the layout. Large-format tiles (600x600mm and above) in bathrooms require a higher standard of substrate preparation and are more expensive to lay due to levelling requirements. Mosaic or feature tiles, particularly for a dedicated shower feature wall, add $500 to $1,500 to the tiling budget. The tile specification itself — from a $2/sqft standard ceramic to a $15+/sqft premium porcelain — drives a significant portion of the variance in overall bathroom cost.
Sanitary Fixtures (Toilet Bowl, Basin, Shower)
Mid-range sanitary fixtures for a complete bathroom — wall-hung or floor-mounted toilet bowl, vanity with basin, shower mixer, fixed rain shower or shower column — cost $2,000 to $4,500 for supply and installation. Upgrading to a wall-hung toilet with concealed cistern adds $600 to $1,200 for the in-wall cistern frame. Premium European brands (Grohe, Hansgrohe, Roca, Duravit) double or triple the fixture cost but deliver meaningfully better performance and aesthetics over a twenty-year service life.
Shower Screen or Bath Enclosure
A standard frameless or semi-frameless tempered glass shower screen costs $600 to $1,500 installed. Full glass shower enclosures (three-sided) cost $1,200 to $2,500. Frameless glass with minimal hardware commands a premium but delivers a cleaner aesthetic and is easier to clean in Singapore’s hard water conditions.
Electrical Works
Bathroom electrical works typically cover lighting replacement (concealed LED cove or surface-mounted), exhaust fan replacement, and storage water heater replacement if applicable. A comprehensive electrical package for a bathroom runs $600 to $1,500 depending on scope. Instant water heaters are generally preferred in Singapore over storage heaters for their space efficiency and consistent performance; a quality instant heater (Ariston, Joven, or equivalent) costs $200 to $450 for supply and installation.
Wet Works vs Dry Works: Why This Distinction Matters
HDB distinguishes between wet works and dry works in its renovation regulations. Wet works — defined broadly as works involving waterproofing, hacking, tiling, and plumbing modifications — require a renovation permit and must be carried out by licensed tradespeople. Dry works — painting, carpentry, fixture replacement without plumbing modification — are generally permit-exempt and can proceed without HDB approval. Understanding this distinction is important because wet works carry a mandatory curing period for waterproofing membranes (typically 24 to 48 hours) before tiling can proceed. Contractors who skip this curing period to accelerate the timeline are compromising the waterproofing integrity of the installation.
HDB Waterproofing Requirements
HDB’s renovation guidelines specify that all wet area floors must be waterproofed before tiling, and that shower area walls must be waterproofed to a minimum height of 1,800mm. The waterproofing membrane must be applied over a properly prepared substrate — any cracks, spalling, or contamination in the substrate must be repaired before membrane application. Flood tests (filling the wet area with water to a depth of 25mm and holding for 24 hours) are best practice before tiling proceeds, allowing any membrane failures to be identified and rectified. Your contractor should carry out a flood test as a matter of course; if they do not, request one explicitly.
How to Evaluate Bathroom Renovation Quotations in Singapore
Interior design firms and renovation platforms in Singapore — including Qanvast-matched designers and Livspace renovation packages — typically present bathroom renovation as part of a whole-home package. This makes it difficult to compare individual bathroom costs against market benchmarks. When bathroom renovation is unbundled from a whole-home package, interior design firms typically price a full mid-range HDB bathroom renovation at $12,000 to $18,000 — 30 to 50 per cent above the equivalent direct contractor price — reflecting design fees, material margins, and project management costs built into the quotation structure.
Hock Star provides standalone and whole-home bathroom renovation services at direct contractor pricing. Our quotations are fully itemised — each line item is priced separately so you can see exactly what you are paying for. We handle all HDB permit applications, conduct waterproofing flood tests as standard, and provide a workmanship warranty on all wet works.
Disclaimer: References to third-party platforms and firms are provided for market context only. Pricing and service quality vary by project and individual provider.
Conclusion: Prioritise Waterproofing, Specify Clearly, and Choose the Right Contractor
Bathroom renovation in Singapore is an area where the cheapest quote almost always proves the most expensive in the long run. Waterproofing failures, hollow tile work, and poor-quality fixtures will require remediation — and remediation in a bathroom means full rehacking, which starts the cost clock again from zero. The way to avoid this outcome is to prioritise waterproofing specification, demand itemised quotes, and choose a contractor with demonstrable experience in HDB wet works.
Hock Star specialises in bathroom renovation for HDB and condo homes across Singapore. BCA-licensed, HDB-registered, and fully transparent on pricing. Request your free bathroom renovation quote from Hock Star today.
Frequently Asked Questions
How much does a full bathroom renovation cost in Singapore for an HDB flat in 2026?
A full mid-range bathroom renovation for a standard HDB common bathroom (4 to 5 sqm) in Singapore in 2026 costs $7,000 to $12,000, inclusive of full tile hacking, waterproofing, new tiling throughout, toilet bowl, basin, shower fixtures, and basic electrical works. A master bathroom renovation costs $9,000 to $16,000 for equivalent scope. Premium specifications with high-end European fixtures and large-format tiles push costs to $14,000 to $25,000.
What are HDB’s waterproofing requirements for bathroom renovation in Singapore?
HDB requires that all wet area bathroom floors be waterproofed before tiling, and that shower area walls be waterproofed to a minimum height of 1,800mm. The waterproofing membrane must be applied over a properly prepared substrate. Best practice is to conduct a flood test — filling the wet area to 25mm depth and holding for 24 hours — before tiling proceeds, to identify any membrane failures. Your contractor should apply waterproofing as part of any full bathroom renovation scope.
Do I need an HDB permit for a bathroom renovation in Singapore?
Yes. An HDB renovation permit is required for wet works, including tile hacking, waterproofing, plumbing modifications, and electrical rewiring in bathrooms. Fixture replacement without plumbing modification may not require a permit, but any work involving hacking or plumbing changes must be covered by a valid permit. Your contractor must be HDB-registered and must submit the permit application before any wet works commence.
Can I renovate only part of my HDB bathroom to save money in Singapore?
Partial bathroom renovations — such as replacing only floor tiles or only fixtures — are possible but carry risks. Partial hacking can disturb adjacent tile bonding, and retaining old waterproofing while replacing tiles means the waterproofing system remains of uncertain integrity. If existing tiles show hollow spots (identifiable by tapping), a full hack is typically more economical long-term. A cosmetic refresh replacing only fixtures without hacking costs $2,500 to $5,000 but does not address underlying waterproofing.
How long does a bathroom renovation take for an HDB flat in Singapore?
A full bathroom renovation for an HDB flat typically takes 10 to 14 working days from commencement of works, inclusive of hacking (1 to 2 days), waterproofing and curing (2 to 3 days minimum), tiling (2 to 3 days), fixture installation (1 to 2 days), and final finishes. The waterproofing curing period cannot be compressed without compromising membrane integrity. Add 3 to 5 working days for HDB permit processing before works commence.