New sun tunnel systems are brighter, more energy-efficient and designed to prevent condensation and weather problems.
When Should You Replace a Sun Tunnel?
Over time, older daylight systems can suffer from:
- Discoloured or cracked domes
- Failed flashing allowing water ingress
- Condensation inside the tube
- Loss of light output
- Damaged reflective lining
- Aged seals or poor insulation
A replacement solves these issues in a single visit, with minimal disruption and a noticeable improvement in interior brightness.
Typical Sun Tunnel Replacement Process
- Inspection of existing sun tunnel
- Removal of old dome, flashing and tubing
- Installation of a new daylight system
- Correct sealing and roof weatherproofing
- Testing for light output and air tightness
Most replacements can be completed in a few hours.
Rigid vs Flexible Sun Tunnel Comparison
| Type | Best For | Light Output | Typical Cost (Installed) |
|---|---|---|---|
| Rigid | Maximum daylight, longer tube runs | Very high | £900 – £1,800 |
| Flexible | Tight loft spaces, easy replacement | Moderate | £600 – £1,200 |
Brand Comparison Table
| Brand | Suitable Roof Types | Warranty | Notes |
|---|---|---|---|
| Velux | Pitched & flat | 10 years | Most popular choice with UK installers |
| Solatube | Pitched, flat & long tube systems | 10–25 years | Premium daylight technology, very bright |
| Fakro | Pitched roofs | 10 years | Good value alternative with solid performance |
| LiteLite | Pitched roofs | 5 years | Affordable, easy to replace older systems |
Pricing Comparison Table
| Replacement Job Type | Average UK Cost |
|---|---|
| Dome replacement only | £80 – £300 |
| Flexible tube replacement | £400 – £800 |
| Full rigid system replacement | £900 – £1,800 |
| Flat roof sun tunnel replacement | £1,200 – £2,500 |
Velux vs Solatube Replacement Comparison
| Feature | Velux Sun Tunnel Replacement | Solatube Replacement |
|---|---|---|
| Typical light output | High | Very high |
| Best for | Standard roof distances, pitched roofs | Longer runs, complex layouts, premium jobs |
| Replacement difficulty | Moderate | Moderate to high |
| Product range | Pitched and flat roof kits | Wide range of specialist daylight systems |
| Typical installed cost | £800 – £1,600 | £1,200 – £2,500 |
Flat Roof vs Pitched Roof Replacement
| Roof Type | Complexity | Typical Work Involved | Average Cost Range |
|---|---|---|---|
| Pitched Roof | Moderate | Replace dome, tube and flashing around tiles/slate | £600 – £1,800 |
| Flat Roof | Moderate to High | Specialist flat roof kit, sealing around membrane | £1,200 – £2,500 |
Signs Your Sun Tunnel Needs Replacing
- You notice water marks on ceilings around the diffuser
- Light output has reduced significantly over time
- There is visible condensation inside the tube
- Dome looks cloudy, yellow or cracked
- Roof flashing looks cracked or lifted by weather
Replacing the system solves performance issues and protects your roof from leaks and damp.
Leading Products We Replace
Velux Sun Tunnels
Well-known for quality and reliable flashing kits, especially for pitched roofs.
Solatube Daylighting Systems
Extreme brightness, long warranty and advanced moisture control features.
Fakro Light Tunnels
Great balance between cost and performance, good all-round choice.
LiteLite Tubular Rooflights
Popular for quick, affordable replacements on older systems.
Installation Benefits
- Fast installation
- Weatherproof flashing systems
- Improved energy performance
- Cleaner, brighter daylight
- Better insulation and condensation control
New sun tunnel systems often include enhanced reflective linings which can deliver up to 30% more light than some older models.
Typical Replacement Costs
As a guide:
- Standard replacement: £600 – £1,200
- Premium system upgrade: £1,200 – £2,500
- Extra insulation and moisture control: £50 – £150
For an accurate cost, request free quotes from vetted local installers.
Get Free Sun Tunnel Replacement Quotes
Tell us a few details about your existing system and receive up to four free quotes from local specialists. All installers are vetted, insured and experienced in replacing damaged or older sun tunnels.
Brighten your home and protect your roof — request your free replacement quotes today.
Frequently Asked Questions
Can my existing roof opening be reused?
In many cases, the existing opening can be reused, especially if you are replacing an older sun tunnel with a similar size and type. Your installer will confirm this during the survey.
Will replacing my sun tunnel damage my roof?
A professional installer will remove the old system carefully and fit new flashing and seals to protect your roof. When done correctly, the roof remains fully weatherproof.
Do I need scaffolding for a sun tunnel replacement?
For bungalows and some low roofs, access can often be achieved using ladders and safety equipment. Taller properties and complex roofs may require scaffolding or a mobile tower.
How long does a sun tunnel replacement take?
Most replacements are completed within a few hours. More complex jobs or flat roof systems may take longer, but usually still within a single day.
Is it better to repair or replace my sun tunnel?
If the problem is minor, such as a small leak or damaged seal, a repair may be enough. However, if the dome, tube and flashing are all ageing or damaged, a full replacement is often more cost-effective and provides better long-term performance.