There's a question we get asked on almost every free quote visit across Melbourne: "Should I go fixed or ventilated?" It sounds simple. It isn't - or at least, it shouldn't be answered with a shrug and "depends on your budget."
The choice between a fixed and a ventilated skylight actually has a meaningful impact on how a room feels, how much you'll spend over the next decade, and how well the skylight performs in Melbourne's unpredictable climate. So let's go through it properly.
What Is a Fixed Skylight?
A fixed skylight is a sealed glazed unit set permanently into the roofline. It brings natural light into a room but does not open - there's no mechanism, no handle, no remote. Light in, nothing out.
That simplicity is actually one of its greatest strengths. Fixed skylights are the most installed type in Australian residential homes for good reason: they're straightforward to waterproof, they have no moving parts to fail, and they do exactly one job with quiet consistency.
What Is a Ventilated Skylight?
A ventilated skylight (also called an opening or operable skylight) does everything a fixed unit does - admits light - but also opens to allow fresh air in and stale, humid air out. The opening mechanism can be manual (a rod or handle), electric (switch or remote), or fully automated via sensors.
Velux's INTEGRA range is the premium example: solar or mains-powered, with a built-in rain sensor that closes the skylight automatically when it detects moisture. For Melbourne homeowners who've learned to never trust a clear morning sky, that feature alone is worth a conversation.
Fixed vs Ventilated: Head-to-Head Comparison
| Feature | Fixed Skylight | Ventilated Skylight |
|---|---|---|
| Function | Light only | Light + airflow |
| Installed cost (standard) | AU$1,200–AU$2,500 | AU$1,800–AU$3,500 |
| Moving parts | None | Opening mechanism + seals |
| Maintenance requirements | Minimal - glass clean + flashing check | Seals, hinges + mechanism every 2–3 yrs |
| Moisture / condensation control | Moderate | Excellent - vents humidity out directly |
| Energy efficiency (summer) | Good with Low-E glass | Excellent - heat escapes when open |
| Noise / weather seal | Superior - fully sealed | Very good - dependent on seal quality |
| Smart home integration | Limited | Full - electric models + app control |
| Installation complexity | Simpler | Slightly more complex (electric models need electrician) |
| Long-term durability | 20–25+ years | 20+ years with servicing |
Cost Comparison
Budget is often the deciding factor - but it's worth understanding why ventilated skylights cost more before concluding they're not worth it.
| Skylight Type | Installed Cost (AU$, incl. GST) | What adds to the cost |
|---|---|---|
| Fixed (single-glazed) | AU$1,200–AU$1,800 | Entry-level unit |
| Fixed (Velux double-glazed) | AU$1,500–AU$2,500 | Premium glazing |
| Ventilated (manual) | AU$1,800–AU$2,600 | Opening mechanism |
| Ventilated (electric) | AU$2,200–AU$3,500 | Motor + electrical wiring |
| Velux INTEGRA (rain sensor) | AU$2,800–AU$4,500 | Automation + rain detection |
Energy Efficiency: Which Performs Better in Melbourne?
Melbourne's climate demands a skylight that can handle both extreme summer heat and genuinely cold winter mornings. Neither type has an outright edge here - but the glazing and how you use the skylight matters enormously.
| Climate factor | Fixed (Low-E double-glazed) | Ventilated (electric, Low-E) |
|---|---|---|
| Summer heat management | Good - glass limits solar gain | Excellent - open to release hot air |
| Winter warmth retention | Excellent - no seal gaps | Very good - quality seals essential |
| Condensation risk | Moderate in humid rooms | Low - ventilation removes humid air |
| Passive cooling potential | None | High - stack effect draws cool air in |
| Energy star performance | Good | Excellent (Velux INTEGRA rated) |
One thing worth understanding is the stack effect: hot air rises. An open ventilated skylight at ceiling level creates a natural convection current that draws cooler air in through lower openings and exhausts hot air upward. On a Melbourne summer evening, this can meaningfully cool a room without touching the air conditioning.
Pros and Cons: Fixed Skylights
Pros and Cons: Ventilated Skylights
Moisture, Condensation, and the Melbourne Climate
Melbourne homeowners deal with condensation more than they often realise. A hot shower on a cold morning, a kitchen running all evening, a laundry with a vented dryer - all of these push moisture into the air. If that moisture has nowhere to go, it lands on the coldest surface in the room: often the skylight glass.
Surface condensation on a fixed skylight isn't a fault - it's physics. But it can lead to water pooling, mould growth on surrounding plasterboard, and general deterioration if left unmanaged over years. A ventilated skylight opened regularly eliminates the problem at the source.
Maintenance: What to Expect from Each
Fixed skylight maintenance
Fixed skylights are genuinely low-effort. A glass clean when you notice build-up, and a visual check of the flashing and roof seal every 3–5 years - ideally after a heavy storm season. That's essentially it.
Ventilated skylight maintenance
Slightly more involved, but still manageable. The opening mechanism, hinges, and perimeter seals should be inspected and lubricated every 2–3 years. Electric motor mechanisms on Velux and equivalent models are designed to last the product's lifespan, but like any mechanical component, they can need attention over a 20-year period. Budget for occasional servicing and it becomes a minor ongoing cost rather than a surprise.
Long-Term Value: Which Is the Better Investment?
Here's the honest answer: a ventilated skylight in the right room delivers more long-term value than a fixed unit in the wrong one. And vice versa.
A fixed Velux double-glazed skylight in a south-facing living room will provide beautiful, even light for 25+ years with almost zero intervention. That's exceptional value. But a fixed skylight in a bathroom that ends up with a persistent condensation problem - mould, water damage, repainting - costs far more in the long run than upgrading to a ventilated unit at installation time.
Match the skylight type to the room's actual needs, and both types deliver outstanding long-term returns.
Frequently Asked Questions
Not Sure Which Is Right for Your Home?
Our team visits homes across Melbourne every day. Book a free consultation and we'll walk through your rooms, your roof, and your budget - and give you an honest recommendation on the spot.
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