Doors & Flush Doors · Bathroom
Flush Doors for Bathrooms
A bathroom door faces more sustained moisture than almost any other door in the house, which makes the core grade the single most important choice you'll make.
| Aspect | Standard Interior Flush Door | BWP Bathroom Flush Door |
|---|---|---|
| Core grade | MR (moisture-resistant) | BWP (boiling waterproof) |
| Water resistance test | Resists ambient moisture only | Passes a 72-hour boiling-water test without delaminating |
| Typical lifespan in wet use | Shortened significantly by sustained moisture | 10–15 years or more in regular bathroom use |
| Recommended thickness | 30–35mm | 30–32mm, matched to the frame |
| Recommended width | 750–900mm (bedroom) | 600–750mm (bathroom standard) |
Flush vs Panel vs PVC/WPC for Bathrooms
BWP Flush Door
The most common choice — good moisture resistance at a reasonable cost, with a wide range of laminate and veneer finishes.
PVC/WPC Door
Fully waterproof and immune to termites, at a higher cost — worth considering for bathrooms with especially heavy, sustained moisture exposure.
Panel Door
Less common for bathrooms since the extra joints in a panel door are more vulnerable to water ingress than a flush door's uniform flat surface.
Getting the Sizing Right
Standard bathroom door heights run 1980–2100mm, with 700mm being a commonly preferred width for a comfortable but space-efficient opening.
When to Consider WPC Instead
If the bathroom sees especially heavy use or direct water contact near the door, a fully waterproof WPC door may be worth the extra cost over even a BWP flush door — see our WPC vs plywood guide for that comparison, and our marine plywood guide for more on BWP grade performance.
Frequently Asked Questions
What is the best door for a bathroom?
A BWP-grade (boiling waterproof) flush door is the most common and cost-effective choice for bathrooms; a fully waterproof PVC/WPC door is worth considering for especially heavy moisture exposure.
What size flush door is used for bathrooms?
600–750mm width (700mm is a common preferred size) and 1980–2100mm height are typical for bathroom doors, with 30–32mm thickness.
Can a standard MR-grade door be used in a bathroom?
It's not recommended — a bathroom's sustained moisture exposure will shorten an MR-grade door's lifespan considerably compared to a BWP-grade door built for that level of exposure.
Is a PVC door better than a BWP flush door for bathrooms?
PVC/WPC doors are fully waterproof and immune to termites, making them a strong option for heavy-use bathrooms, though BWP flush doors remain a reliable, more affordable choice for typical residential use.
How long does a BWP flush door last in a bathroom?
Typically 10 to 15 years or more with regular use, provided the door is properly sealed and not left in standing water.
Need the Right Board for Your Project?
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