If your skylight is leaking or discoloured, you might wonder whether it’s better to replace just the dome or invest in a complete new skylight. The right choice depends on your skylight’s age, condition, and goals for your home. This guide explains the differences so you can make an informed decision.
Option 1: Replacing the Dome Only
What It Involves:
Removing the old dome and fitting a new cover on your existing skylight frame.
Key Advantages:
- Cost-Effective: Often 30–60% less expensive than a full skylight replacement.
- Faster: Usually completed in a single visit.
- Minimal Disruption: No need for roof re-work or extensive interior finishing.
- Fresh Appearance: Replacing a yellowed or cracked dome can transform a space.
When This Option Makes Sense:
- The frame and flashing are still in good condition.
- There are no recurring structural leaks.
- You’re happy with the current skylight size and location.
Considerations:
- If the frame is damaged or very old, replacing only the dome may be a temporary fix.
- Older frames may have reduced energy efficiency compared to modern units.
Option 2: Installing a New Skylight
What It Involves:
Removing the existing skylight entirely and installing a new unit with updated materials and flashing.
Key Advantages:
- Improved Energy Efficiency: Modern skylights often have better insulation and glazing.
- Fresh Flashing and Frame: Reduces the risk of future leaks.
- Customisation: Opportunity to change size, style, or placement.
When This Option Makes Sense:
- The frame or flashing shows signs of rot or corrosion.
- There are persistent leaks around the skylight base.
- You want to upgrade to a different style (e.g., vented skylight).
Considerations:
- Higher upfront cost
- May require interior repairs (e.g., plastering, repainting).
- Longer installation time.
Quick Comparison Table
| Feature | Replace Dome Only | Install New Skylight |
|---|---|---|
| Cost | Lower | Higher |
| Time Required | Fast | Longer |
| Disruption | Minimal | Moderate |
| Improves Frame Condition | No | Yes |
| Energy Efficiency Upgrade | Limited | Significant |
| Aesthetic Upgrade | Moderate | Full |
Illustrative Example
“A homeowner in Christchurch had a leaking skylight with a sound frame. They replaced the dome only, resolving the leak affordably in one day. Another homeowner in Wellington had an older timber-framed skylight with rot and chose a full replacement for long-term peace of mind.”
Key Takeaways
- Replacing the dome is cost-effective if the frame is in good condition.
- Installing a new skylight is recommended for structural issues or full upgrades.
- Always inspect for frame damage before deciding.
Need Personalised Advice?
If you’re unsure which option is best for your home, our team can help you weigh up the pros and cons.