Bathroom Renovation Guide 2026

Bathroom Renovation Checklist Australia 2026 Complete Planning Guide: $8,000-$25,000 Costs, AS 3740 Waterproofing, 4-8 Week Timeline

What do you need to know before renovating a bathroom in Australia? Complete checklist with step-by-step planning, cost breakdown by size, waterproofing requirements, and design considerations.

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The Wombat Team

Updated 15 April 2026

Guide

Quick Answer 5 min read

Complete Bathroom Renovation Checklist

A successful bathroom renovation follows four key phases: Pre-Renovation (2-4 weeks planning, permits, design, quotes), Demolition Phase (3-5 days demo, waterproofing prep, asbestos check), Installation Phase (2-3 weeks tiling, plumbing, electrical, fixtures), and Finishing Touches (3-5 days painting, sealing, final inspection). Total timeline: 3-5 weeks. Critical checkpoints: AS 3740 waterproofing certification, licensed tradies for all plumbing/electrical, final inspection before handover. Costs: $15k-$30k mid-range.

Checklist Overview

Get 3-5 detailed quotes from licensed contractors. Check permits required (council/strata). Finalize design, fixtures, tile selections. Plan temporary bathroom access. Remove old fixtures, tiles, vanity safely. Check for asbestos (pre-1990s homes). Dispose of waste at licensed facility. Prepare substrate for waterproofing. Waterproofing + AS 3740 certification. Floor + wall tiling (7-10 days cure time). Plumbing rough-in, electrical, ventilation. Install vanity, toilet, shower, fixtures. Grout sealing (wait 48-72 hours cure). Painting, mirror, accessories installation. Final inspection + waterproofing sign-off. Deep clean before handover

Critical Success Factors

Never skip waterproofing certification - it's legally required in Australia. AS 3740 compliance prevents $10k-$30k water damage repairs. Only hire licensed plumbers and electricians (check licenses at servicensw.gov.au). Allow 48-72 hours cure time for tiles before grouting. Test all fixtures before final sign-off. Keep existing plumbing layout to save $3,500-$7,500. Add 15% contingency for hidden issues (common in pre-1990s homes).

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Local factors

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Bathroom Renovation Costs by Size: Small, Medium, Large Pricing 2026 Australia

Small Bathroom (3-4sqm)

Ensuite or powder room • Basic fixtures • Standard finishes

Budget Refresh

$8,000-$12,000

• Paint & new fixtures
• Budget tiles/vinyl
• Basic vanity & mirror
• Standard toilet & taps
• 1-2 week timeline

Standard Renovation - Most Popular

$12,000-$18,000

• Full retile & waterproofing
• Mid-range tiles
• Quality vanity & storage
• New shower screen
• 2-3 week timeline

Premium Quality

$18,000-$25,000

• Designer tiles & finishes
• Premium fixtures & fittings
• Custom vanity & storage
• Heated towel rail
• 3-4 week timeline

Medium Bathroom (5-7sqm)

Main family bathroom • Bath & shower • Full storage

Budget Refresh

$12,000-$18,000

• Cosmetic updates only
• Budget materials
• Off-the-shelf vanity
• Basic fixtures
• 2-3 week timeline

Standard Renovation - Most Popular

$18,000-$28,000

• Complete renovation
• Quality tiles & fixtures
• Semi-custom vanity
• Separate bath & shower
• 3-4 week timeline

Premium Quality

$28,000-$40,000

• Luxury finishes
• Premium tiles & stone
• Custom cabinetry
• High-end fixtures
• 4-6 week timeline

Large Bathroom (8sqm+)

Master ensuite • Luxury features • Custom design

Standard Renovation

$20,000-$30,000

• Quality finishes
• Standard fixtures
• Walk-in shower
• Double vanity option
• 4-5 week timeline

Premium Quality

$30,000-$50,000

• Designer finishes
• Premium fixtures
• Custom cabinetry
• Underfloor heating
• 5-6 week timeline

Luxury Custom

$50,000-$80,000+

• Luxury stone & tiles
• High-end European fixtures
• Full custom design
• Smart features & automation
• 6-8 week timeline

Complete Cost Breakdown: Labour, Fixtures, Tiles, Waterproofing 2026 Australia

Based on a typical medium bathroom renovation ($22,000 total):

Tiling & Waterproofing $6,600 (30%)

Vanity & Cabinetry $4,400 (20%)

Fixtures (Toilet, Taps, Shower) $3,300 (15%)

Plumbing Work $2,860 (13%)

Electrical & Lighting $2,200 (10%)

Demolition & Waste Removal $1,540 (7%)

Painting & Finishing $1,100 (5%)

Step-by-Step Planning Timeline: 4-8 Weeks Total Project Duration Australia

Phase 1: Planning (2-4 weeks before)

• Set budget: Determine total spend including 10-15% contingency
• Measure space: Create accurate floor plan with all measurements
• Research & inspiration: Collect design ideas, Pinterest boards, colour schemes
• Get 3+ quotes: Compare licensed bathroom renovators
• Check compliance: Confirm if council approval needed (rare for bathrooms)

Phase 2: Selection (2-3 weeks before)

• Choose tiles: Wall tiles, floor tiles, grout colour (order 10% extra)
• Select vanity: Size, style, storage, basin type (undermount/vessel)
• Choose fixtures: Toilet, taps, shower head, shower screen, accessories
• Select lighting: Downlights, vanity lights, exhaust fan (all IP rated)
• Confirm waterproofing: Ensure licenced waterproofer booked

Phase 3: Pre-Construction (1 week before)

• Arrange alternative bathroom: Set up temporary facilities
• Clear bathroom: Remove all items, medicine cabinet, accessories
• Protect access paths: Cover floors/stairs from bathroom to street
• Confirm delivery dates: Ensure all materials arrive before/during reno
• Final contractor meeting: Confirm timeline, scope, payment schedule

Phase 4: Construction (3-6 weeks)

• Week 1: Demolition, plumbing rough-in, electrical rough-in
• Week 2: Waterproofing (requires 7-day cure + certification)
• Week 3-4: Tiling walls and floors, grout, seal
• Week 4-5: Install vanity, fixtures, shower screen, accessories
• Week 5-6: Painting, final electrical/plumbing, clean, handover

Essential Design Considerations: Ventilation, Lighting, Storage, Accessibility Australia

Layout & Space Planning

• Minimum clearances: 600mm in front of toilet/basin, 900mm shower opening

• Door swing: Consider outward opening or sliding doors for small spaces

• Storage planning: Include recessed niches, wall cabinets, vanity drawers

• Future accessibility: Consider grab rail positions, curbless shower option

• Keep plumbing location: Moving toilet/basin adds $1,500-$3,000 to costs

Fixture Selection Guide

• Toilet: Back-to-wall ($300-$800) vs wall-hung ($600-$1,500)

• Basin: Undermount (easiest clean) vs vessel (statement piece)

• Shower: Standard 900mm ($400-$800) vs walk-in ($1,200-$3,000)

• Tapware: Chrome (cheapest) vs brushed brass/black (trending, 30% more)

• WELS rating: Choose 4+ star fixtures for water efficiency rebates

Tiles & Material Selection

• Floor tiles: Must be slip-resistant (R10+ rating for wet areas)

• Wall tiles: Large format (600x300mm+) = less grout, modern look

• Natural stone: Requires sealing every 1-2 years, shows water marks

• Porcelain vs ceramic: Porcelain is denser, more water-resistant, 20% pricier

• Grout colour: Lighter grout shows more dirt, charcoal/grey most practical

Lighting & Ventilation

• IP rating required: IP44+ for bathroom, IP65+ for shower zone

• Layered lighting: Downlights + vanity lights + feature/mirror lighting

• Exhaust fan size: Minimum 25L/s extraction, bigger for bathrooms 8sqm+

• Ducting: Must vent directly outside, not into roof cavity (causes mould)

• Timer switch: Keeps fan running 10-15 mins after light off ($50 upgrade)

Waterproofing Requirements AS 3740: Mandatory Compliance Standards 2026 Australia

Why Waterproofing is Non-Negotiable

Waterproofing is legally required by Australian building codes and must be certified by a licensed professional. Poor waterproofing is the #1 cause of bathroom failures, leading to water damage, structural rot, and mould that costs $10,000-$30,000+ to rectify.

Areas Requiring Waterproofing

✓ Shower area: Full height (minimum 1800mm) on all walls, full floor
✓ Bath area: 150mm above bath edge on walls, 100mm beyond bath footprint
✓ Basin area: 100mm behind basin, 150mm around basin on walls
✓ Entire floor: Must be fully waterproofed including under toilet
✓ Penetrations: All pipes, drains, fixtures must be sealed with bands

Waterproofing Process & Timeline

1. Surface prep: Clean, level substrate (cement sheet/concrete)
2. Membrane application: 2-3 coats liquid membrane or sheet membrane
3. Reinforcing: Fabric tape on all joints, corners, penetrations
4. Curing time: 7 days minimum before tiling (critical - do not rush)
5. Certification: Licensed waterproofer issues compliance certificate

Warning: DIY Waterproofing is Illegal & Risky

In most Australian states, waterproofing must be completed by a licensed waterproofer and certified. DIY waterproofing voids insurance, fails building inspections, and costs significantly more to fix when it inevitably leaks.

Money-Saving Strategies for Bathroom Renovations Australia

Smart Savings (Maintain Quality)

• Keep existing layout: Avoid moving plumbing (saves $1,500-$3,000)
• Off-the-shelf vanity: Custom cabinetry costs 50-100% more
• Large format tiles: Faster install = lower labour costs
• Mix materials: Use expensive tile as feature wall only
• Standard shower screen: Custom costs 2-3x more ($800 vs $2,000)
• Time renovations right: Winter has more availability, better quotes

Risky Savings (May Cost More Long-Term)

• Unlicensed tradies: No insurance, no warranty, illegal waterproofing
• Cheapest materials: Budget tiles crack, cheap tapware leaks
• Skipping exhaust fan: Causes mould within 12 months
• DIY plumbing/electrical: Illegal, dangerous, voids insurance
• Rushing waterproofing: Not allowing proper cure time causes leaks
• Skipping contingency: 10-15% buffer essential for hidden issues

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FAQ

Frequently Asked Questions

Clear answers to the questions homeowners usually ask before comparing quotes.

How much does a bathroom renovation cost in Australia?

Bathroom renovation costs vary by size and quality. Small bathroom (3-4sqm): $8,000-$18,000 for budget reno, $15,000-$25,000 mid-range, $25,000-$40,000+ premium. Standard bathroom (5-6sqm): $12,000-$25,000 budget, $20,000-$35,000 mid-range, $35,000-$60,000+ premium. Large ensuite (7-8sqm+): $18,000-$35,000 budget, $30,000-$50,000 mid-range, $50,000-$100,000+ premium. Costs include demolition, waterproofing, tiling, fixtures, plumbing, electrical, and labour.

How long does a bathroom renovation take?

Bathroom renovation timelines depend on scope. Cosmetic refresh (no layout changes): 1-2 weeks including tile replacement, new fixtures, painting. Standard renovation (same layout): 3-4 weeks for full strip-out, waterproofing, retiling, new plumbing fixtures. Complete rebuild (layout changes): 4-6 weeks including structural work, plumbing relocation, electrical additions. Add 1-2 weeks for council approval if CDC required. Weather delays and material availability can extend timeline 1-2 weeks.

Do I need waterproofing for bathroom renovation?

Yes, waterproofing is mandatory for all wet areas in Australian bathrooms per Building Code (AS 3740). Required waterproofing areas: shower floors and walls up to 1.8m high, bath surrounds to 150mm above bath rim, bathroom floors (entire floor recommended), and behind all wall tiles in wet zones. Licensed waterproofer must certify work. Cost: $800-$2,500 for standard bathroom. Non-compliant waterproofing causes leak damage ($5,000-$50,000 repairs) and voids insurance.

What is the best tile size for small bathrooms?

For small bathrooms (under 5sqm), large format tiles (600x600mm or 600x1200mm) create illusion of more space with fewer grout lines. Avoid busy patterns or very small mosaics which make space feel cluttered. Light colors (white, cream, light grey) reflect light and enlarge perception of space. Consider vertical stacking of tiles to add height. Floor-to-ceiling tiling in shower makes space feel larger. Budget $40-$80/sqm for quality porcelain tiles, $80-$150/sqm for premium natural stone.

Should I move the toilet when renovating?

Moving the toilet adds $500-$2,000 in plumbing costs depending on distance moved and floor type. Only move if: improving ergonomics or layout efficiency, creating space for larger shower or vanity, fixing poor original placement, or relocating from external to internal wall. Concrete slab floors make toilet relocation expensive ($1,500-$3,000) due to cutting slab and relocating waste pipes. Timber floor homes easier and cheaper ($500-$1,000). If budget tight, keep toilet in same location to save costs.

How much does bathroom waterproofing cost?

Professional bathroom waterproofing costs $800-$2,500 for standard bathroom (5-6sqm). Pricing breakdown: Shower base and walls (up to 1.8m): $500-$1,200, full bathroom floor: $300-$600, bath surround: $200-$400. Large bathrooms (7-8sqm+) cost $1,500-$3,500. Must use licensed waterproofer - DIY waterproofing usually fails and insurance won't cover leak damage. Waterproofer provides 10-year warranty. Includes membrane application, testing, and certification required for council/certifier approval.

What ventilation is required in bathrooms?

Australian Building Code requires mechanical ventilation (exhaust fan) if no external window, or window under 10% of floor area. Minimum exhaust rate: 25 litres/second for bathrooms. Exhaust fan must: vent directly outside (not into roof space), have backdraft damper, operate via light switch or separate switch. Quality exhaust fan costs $150-$400, installation $250-$600. For windowless bathrooms, consider ceiling-mounted exhaust with timer or humidity sensor ($300-$800) to prevent mould and moisture damage.

Can I renovate my bathroom myself?

You can do some DIY work but licensed trades required for: plumbing (licensed plumber only), electrical (licensed electrician only), waterproofing (licensed waterproofer), and gas (licensed gasfitter if gas hot water). DIY-friendly tasks: demolition, painting, tiling (if competent), installing vanity/mirror, grouting, sealing. Risks of unlicensed work: insurance void for water/electrical damage, cannot obtain compliance certificates, difficulty selling property, $5,000-$50,000 fines. Save money by doing demolition/preparation yourself, then hire licensed trades for regulated work.

What is the best flooring for bathrooms in Australia?

Porcelain tiles are the best choice for Australian bathroom floors - waterproof, durable, slip-resistant when textured, easy to clean, and available in endless designs ($40-$150/sqm installed). Natural stone (travertine, marble, limestone) looks premium but requires sealing and costs more ($80-$200/sqm). Avoid: laminate (swells with water), hardwood (warps), carpet (harbors mold). Choose tiles with R10+ slip rating for wet areas. Large format tiles (600x600mm) reduce grout lines and cleaning. Ensure proper falls to floor waste (1:100 minimum slope).

Is it worth renovating bathroom before selling?

Bathroom renovation typically returns 60-80% of cost in added property value, making it worthwhile if bathroom very dated or dysfunctional. High-ROI updates: fresh paint and new fixtures ($2,000-$5,000 spend, $3,000-$6,000 value add), modern tiling and waterproofing ($8,000-$15,000 spend, $10,000-$18,000 value add). Complete high-end reno ($30,000-$60,000) may not return full investment unless in premium suburb. Focus on neutral, modern finishes appealing to broad buyer market. Dated 1980s-1990s bathrooms definitely benefit from renovation before sale.