Are you living with a polycarbonate conservatory roof, or thinking about one? Polycarbonate is cheap and light, but it is also the main reason many conservatories are too hot in summer, too cold in winter and noisy when it rains.
This guide explains what polycarbonate roofs are, their pros and cons, and the best alternatives if you want to upgrade.
What is the best alternative to a polycarbonate conservatory roof?
The main alternatives to a polycarbonate conservatory roof are insulated roof panels, glass and a tiled or solid roof. For most homeowners, insulated panels such as CosyPanels® offer the best balance: they replace the polycarbonate sheets in your existing frame, insulate far better, cut rain noise and are usually fitted from one day, with prices from £3,146 including VAT. A tiled roof gives the highest thermal performance but costs more and often needs structural work, while glass looks smart but still loses heat.
Get a free quote to replace your polycarbonate roof
How the alternatives compare
| Option | Typical cost | Insulation | Rain noise | Installation |
|---|---|---|---|---|
| CosyPanels® insulated panels | From £3,146 including VAT | High (U-value around 0.8 W/m²K for 40mm panels) | Much quieter | From 1 day, into your existing frame |
| New polycarbonate roof | £6,300–£12,150* | Low | Noisy | Quick |
| Tiled or solid roof | £7,875–£15,188* | Highest | Quiet | Several days; may need structural work |
| Glass roof | £9,450–£18,225* | Medium | Moderate | Several days |
*Ballpark full-replacement prices for a 3×3.5m to 4.5×4.5m conservatory, from Checkatrade’s conservatory roof replacement cost guide (March 2026). See our conservatory roof replacement cost guide for more detail.
What is a polycarbonate conservatory roof?
Polycarbonate is a lightweight, impact-resistant thermoplastic that has long been a popular choice for conservatory roofs because it is cheap and easy to install. It lets in natural light and is far lighter than glass, which reduces the load on the conservatory frame.
Its low cost made it the default choice for many conservatories built over the last few decades. As better options have become available, many homeowners are now upgrading their polycarbonate roofs to make the room usable all year round.
Different types of polycarbonate roof
Clear polycarbonate
Clear polycarbonate lets in the most natural light and is the cheapest option. However, it can scratch easily, needs regular cleaning to stay clear, and offers little privacy or shade.
Tinted polycarbonate
Tinted polycarbonate reduces glare and adds some shading and UV protection. The trade-off is less natural light, and it still needs regular cleaning.
Multi-walled polycarbonate
Multi-walled polycarbonate has several layers with air gaps, which insulate better than single sheets and add durability and UV protection. It costs more and needs careful installation, and its insulation is still limited compared with insulated panels or a solid roof.
Advantages of polycarbonate roofs
Lightweight and easy to install
Polycarbonate is much lighter than glass, which simplifies installation and reduces the load on the conservatory structure. Depending on your type of conservatory, it can usually be fitted quickly.
UV protection
Most polycarbonate roofs include UV protection, which helps protect you and your furniture from harmful rays.
Low upfront cost
Polycarbonate’s main advantage is price. It offers basic performance at a low cost, which makes it attractive on a tight budget.
Range of styles
Clear, tinted and multi-walled options give some choice over how much light and shade you get.
Disadvantages of polycarbonate roofs
Poor insulation
Polycarbonate lets heat escape in winter and builds up heat in summer, so many polycarbonate conservatories are uncomfortable for much of the year and expensive to heat or cool.
Noise during rain or hail
The sound of rain or hail on a polycarbonate roof can be very loud, which makes the room hard to relax in during bad weather.
Scratches and impact damage
Polycarbonate is a relatively soft material, so it scratches easily and can be damaged by impacts or falling objects.
Discolouration
Over time, sunlight and weather can cause polycarbonate to yellow or go cloudy, which makes the conservatory look dated and lets in less light.
Expansion, contraction and leaks
Polycarbonate expands and contracts with temperature changes, which can lead to leaks if it isn’t installed and maintained properly.
Ongoing maintenance
Regular cleaning is needed to prevent dirt build-up, scratches and discolouration.
Replacement options for polycarbonate conservatory roofs in detail
CosyPanels® insulated roof panels
CosyPanels® replace the polycarbonate sheets in your existing roof frame with lightweight insulated panels. Each panel has a high-density XPS insulation core between rigid PVC outer layers, with up to 50mm of insulation.
- Far better insulation: our 40mm panels have a U-value of around 0.8 W/m²K, helping keep the room cooler in summer and warmer in winter.
- Quieter: the insulated core greatly reduces the noise of rain and hail.
- Lightweight: under 8 kg per m², so in many cases no structural changes are needed, subject to survey.
- Less condensation: warmer internal roof surfaces help reduce condensation.
- Quick to install: fitted from one day.
- Peace of mind: a 2-year insurance-backed guarantee and a 10-year product warranty.
- Clear pricing: from £3,146 including VAT, covering complete installation, testing and handover. See our conservatory roof insulation cost guide.
Every conservatory is different, so we check suitability at a free survey before confirming a fixed price.
Glass roofing
A glass roof gives a sleek, modern look and keeps the room bright, and modern glass insulates better than many polycarbonate sheets. However, it costs considerably more, still loses heat in colder months and can overheat in strong sun.
Pros: attractive appearance; lets in plenty of light; better insulation than some polycarbonate.
Cons: higher cost; heat loss in winter; can overheat in summer.
Tiled or solid roof
A tiled or solid roof offers the highest thermal performance and makes the conservatory feel like a full extension. It is the most disruptive option: it usually needs structural reinforcement and building regulations approval, takes several days to install and reduces natural light.
Acrylic roofing
Acrylic is lightweight, durable and UV-resistant, with good clarity. It tends to cost more than polycarbonate and is less impact-resistant, and its insulation is similarly limited.
Choosing the right replacement for your conservatory
- Comfort: if your conservatory is too hot, too cold or noisy, choose an option with real insulation, such as insulated panels or a tiled roof.
- Usage: if you want to use the room all year as part of your home, prioritise insulation over light.
- Budget: polycarbonate looks cheapest at first, but replacement, cleaning and higher heating bills add up over time.
- Disruption: insulated panels fit your existing frame and are usually fitted from one day; a tiled roof is a bigger building project.
The importance of professional installation
Whichever option you choose, professional installation is essential to make sure the roof fits properly, stays watertight and meets the relevant standards. Ask for a fixed, written quote that explains exactly what is included.
Frequently asked questions
What is the best alternative to polycarbonate roofing for a conservatory?
For most homes, insulated roof panels such as CosyPanels® are the best balance of comfort, cost and disruption. They fit your existing frame, insulate far better than polycarbonate and are usually fitted from one day. A tiled roof insulates best but costs more and often needs structural work.
Can I replace polycarbonate conservatory roof panels with insulated panels?
Yes. In many cases, insulated panels slot into the same frame that holds your polycarbonate sheets, so no structural changes are needed. Suitability is confirmed at a free survey.
How much does it cost to replace a polycarbonate conservatory roof?
A full replacement with new polycarbonate typically costs £6,300–£12,150 depending on size (Checkatrade, March 2026). Replacing the polycarbonate sheets with CosyPanels® insulated panels starts from £3,146 including VAT.
Do I need planning permission?
Planning permission is rarely needed if the conservatory’s size and height stay the same. Whether building regulations apply depends on your conservatory and the type of roof, and we confirm this at your survey.
Ready to replace your polycarbonate roof?
Book a free quote with CosyPanels and find out how much more comfortable your conservatory could be.