Small bathroom renovation cost on the Sunshine Coast
A small 3–5m² bathroom on the Sunshine Coast costs between $4,000 for a cosmetic refresh and $40,000 for a full gut-and-rebuild with layout change. The variance isn’t random — it comes down to four decisions: scope, tile choice, whether plumbing moves, and how the waterproofing membrane is handled in Queensland’s subtropical humidity.
Quick answer — small bathroom renovation cost on the Sunshine Coast
| Scope | Cost range | Timeline | What’s included |
|---|---|---|---|
| Cosmetic refresh | $4,000–$10,000 | 1–2 weeks | Paint, regrout, new mirror, new tapware, accessories |
| Refresh + vanity swap | $7,000–$15,000 | 2–3 weeks | Cosmetic + new drop-in vanity, new toilet |
| Mid-range full reno (keep layout) | $15,000–$25,000 | 4–6 weeks | New tiles, vanity, toilet, shower screen, taps |
| Full gut + rebuild (same layout) | $22,000–$40,000 | 6–7 weeks | Everything new + new waterproofing |
| Full reno + layout change | $30,000–$50,000 | 8–10 weeks | Moving plumbing rough-in, structural changes |
Three things that decide small-bathroom cost on the Sunshine Coast
1. Whether plumbing moves
Keeping the toilet, vanity, and shower in their current positions saves $3,000–$5,000 every time. The moment plumbing rough-in moves — even by 600mm — a licensed plumber needs to relocate copper feed lines and drain pipes through the slab or subfloor. On Sunshine Coast slab homes this often means concrete cutting ($800–$1,500) plus structural patching ($600–$1,200). The smaller the bathroom, the bigger the proportional hit. On a $25k mid-range reno, moving the toilet 1m adds 15–20% to the total.
2. Tile choice as the biggest variable cost
Tile cost alone can swing a small-bathroom budget by $4,000–$8,000. Builder-grade ceramic floor and wall ($30–$50/m² supply, $80–$110/m² installed) sits at one end. Premium large-format porcelain (600×1200mm at $80–$150/m² supply, $150–$220/m² installed) sits at the other. On 12–18m² of tile coverage in a small bathroom, the gap is real. Mid-range tip: spend up on the feature wall (visible from doorway) and use cheaper-but-quality tile on floor and shower walls.
3. Waterproofing in subtropical humidity
Sunshine Coast bathrooms see 70–85% relative humidity for 5+ months a year. Standard waterproofing membrane (compliant with AS 3740) costs $1,000–$1,500 for a small bathroom. Premium membrane systems with extended-cycle warranties (Wet-Tite, Selleys Wet Area, Crommelin) add $300–$700 but extend service life from ~10 to 15–20 years. Skipping waterproofing or using a cheap installer is the false economy of bathroom renos — a wet-area leak discovered 5 years later is a $15,000–$25,000 rebuild on top.
Itemised example — Buderim 4m² mid-range full reno
| Item | Cost |
|---|---|
| Demolition + cartage of existing fixtures | $1,400 |
| Plumbing rough-in (same-position, no relocation) | $2,200 |
| Electrical (light fitting + exhaust fan wiring) | $650 |
| Waterproofing membrane (AS 3740 compliant) | $1,200 |
| Floor tile 5m² @ $90/m² installed | $450 |
| Wall tile 12m² @ $110/m² installed | $1,320 |
| Vanity custom 900mm + stone benchtop | $2,800 |
| Toilet incl install | $850 |
| Frameless shower screen | $1,400 |
| Mixer taps + shower set (premium chrome) | $1,500 |
| Exhaust fan (humidity-rated) | $480 |
| Mirror + LED light fitting | $620 |
| Towel rails + accessories | $380 |
| Builder labour + project management | $7,500 |
| TOTAL | $22,750 |
Frequently asked questions
Can I DIY a small Sunshine Coast bathroom reno?
Some of it. Paint, mirrors, accessories, towel rails — all DIY-friendly. But waterproofing must be done by a licensed waterproofer in Queensland under AS 3740, and any plumbing or electrical work needs a licensed trade. DIY without compliance voids insurance on future water damage.
How long does a small bathroom reno take?
1–2 weeks for cosmetic. 4–6 weeks for a mid-range full reno (keep layout). 6–7 weeks for a full gut-and-rebuild. Add 2–3 weeks if the layout changes and plumbing moves. Tile supply lead times can add a week or more for premium or imported tile.
Do I need council approval for a small bathroom reno on the Sunshine Coast?
No for like-for-like (same layout, same plumbing positions). Yes when you’re moving plumbing significantly, changing the room size (knocking out a wall), or creating a new bathroom. Approval through Sunshine Coast Council is straightforward but adds 2–4 weeks lead time.
What’s the cheapest way to refresh a small bathroom?
Paint, regrout, new mirror, new tapware, new light fitting, new towel rails — around $2,000–$4,000 total if you DIY the paint and accessories. It buys you 3–5 more years before a full reno is needed, assuming the waterproofing is still intact.
How does Sunshine Coast humidity change the brief vs Sydney or Melbourne?
Three changes. (1) Anti-mould paint and silicone-grade sealants — standard latex paint mildews fast. (2) Humidity-rated exhaust fans with auto-sensing — cheap timer fans don’t run long enough. (3) Premium waterproofing membranes are worth the extra $300–$700 because the humidity cycle accelerates standard-membrane breakdown.
← Back to Sunshine Coast bathroom renovation cost hub