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Last updated: 4 September 2024

Conservatory Insulation: A Complete Guide (2024)

  • Insulating a conservatory offers multiple benefits such as cost savings, enhanced comfort, improved energy efficiency, and increased property value. With proper insulation, you can use your conservatory all year round.
  • Selecting the most suitable insulation method for your conservatory (wall, roof, and floor insulation) will depend on your budget and energy efficiency goals.
  • The cost of insulating a conservatory can vary significantly, typically ranging from £2,000 to £8,000. Factors influencing the price include the size of the conservatory, the materials chosen, and the insulation method used.

Insulating a conservatory enhances its year-round usability by improving thermal efficiency, reducing energy bills, and increasing property value. Environmentally friendly options include multifoil insulation kits and insulated wall panels. Floor insulation methods vary based on floor type, with insulation boards or reflective foil for slab floors and underfloor insulation or insulated panels for raised floors.

Key benefits of conservatory insulation include sustainability, cost savings, and enhanced comfort. Proper insulation reduces the need for additional heating and cooling, lowers carbon emissions, and decreases energy bills. It also transforms the conservatory into a versatile, comfortable space, increases property value, reduces noise, and requires low maintenance.

It's crucial to compare quotes from different professionals to get the best value and optimal results. Start transforming your conservatory today—request multiple quotes from local insulation experts and make your space comfortable year-round. Don't wait—compare quotes now to find the best deal for your needs!

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Benefits of conservatory insulation

Insulating a conservatory offers several significant benefits, particularly in terms of sustainability, cost savings, and enhanced comfort. Below is an overview of the advantages.

Enhanced energy efficiency 

Insulating a conservatory is crucial to creating an energy-efficient home. By improving its thermal performance, you reduce the need for additional heating in winter and cooling in summer. This reduction in energy use directly contributes to lower carbon emissions, aligning with environmental sustainability goals​​.

Cost savings

Properly insulating a conservatory can substantially save energy bills. A well-insulated conservatory retains heat during the winter months and keeps it cooler in summer, reducing the need for artificial heating and cooling. For instance, replacing an old polycarbonate or glass roof with a solid, insulated roof can save homeowners up to £200 annually on energy bills​.

Enhanced comfort

Proper home insulation ensures your conservatory is usable year-round. Without insulation, conservatories often become too hot in summer and too cold in winter. Installing features like insulated conservatory wall panels and opting for the best insulation for conservatory roofs ensures a consistent, comfortable temperature. This makes the conservatory a more pleasant space, whether as a living area, workspace, or recreational room​.

Increased property value

Upgrading the insulation of a conservatory not only enhances comfort and reduces costs but also can increase the overall value of your property. A well-insulated conservatory is considered a valuable home extension, contributing to its market appeal and functionality​​.

Noise reduction

High-quality insulation materials can significantly reduce external noise, creating a quieter and more serene indoor environment. This is particularly beneficial for conservatories in noisy areas or close to busy streets​​.

Longevity and low maintenance

Modern insulation solutions, such as polycarbonate conservatory roof insulation and other advanced materials, are designed to be durable and require minimal maintenance. This ensures that the insulation benefits are long-lasting, providing homeowners with a sustainable and cost-effective solution over time.

How to insulate a conservatory

Insulating a conservatory can significantly enhance its comfort and energy efficiency, making it a usable space year-round. Here are several methods to insulate a conservatory, considering budget, DIY skills, and environmental impact.

Conservatory roof insulation

Various methods can increase thermal efficiency in a conservatory without compromising views. Here’s an overview of several effective conservatory roof insulation options, including their costs and effectiveness.

1. Internal conservatory roof insulation

This method involves creating a new insulated ceiling underneath the existing roof. It uses materials like conservatory insulation panels, which improve thermal efficiency by preventing heat loss in winter and reducing heat gain in summer. This effective and moderately priced method provides good insulation without replacing the existing roof.​

2. Replacing the conservatory roof

Installing a thicker polycarbonate roof insulation is a cost-effective way to insulate your conservatory. While it is cheaper than other methods, it offers moderate insulation. Polycarbonate roofs are easy to shape and install but may not provide the best thermal efficiency, especially in extreme weather conditions.

3. Conservatory foil insulation

Foil insulation, such as EcoQuilt Expert and YBS SuperQuilt, involves adding reflective layers that bounce heat back into the room during winter and reflect heat out during summer. This method is inexpensive, easy to install, and highly effective at maintaining a stable temperature. Due to minimal material usage, it is also an eco-friendly option.

4. Tiled roof conversions

Replacing the existing roof with a solid, insulated tiled roof offers excellent thermal insulation, allowing year-round conservatory use. Although this method is more expensive and typically requires professional installation, it provides the highest level of thermal efficiency and can increase property value​.

5. Glass roofs with insulation

Glass roofs, combined with internal insulation, enhance thermal efficiency while allowing natural light to flood the conservatory. Though more expensive than polycarbonate, glass roofs provide a pleasant aesthetic and better insulation, making them a durable choice for maintaining a bright, airy space​.

6. Solar control films

Solar control films can be applied to the conservatory windows to limit sunlight and reduce heat gain in summer. This method is affordable and maintains garden views, but it is less effective in winter and may require frequent replacement.

7. Thermal blinds and roof drapes

Installing thermal blinds or roof drapes is a budget-friendly DIY solution. These options provide some insulation by capturing heat in pockets, though they are more effective at blocking heat in summer than retaining it in winter. They can also obstruct views, which may be a drawback for some homeowners.

Conservatory floor insulation

Insulating the floor of a conservatory is crucial for enhancing energy efficiency and comfort. The methods vary depending on whether the floor is a slab or already raised. Here are the main techniques for both types:

Slab floors

  • Insulation boards: Insulation boards, such as PIR or polystyrene boards, can be laid directly on the concrete slab before adding the final flooring. These boards provide a solid insulation layer, effectively preventing heat loss through the ground. This method is highly effective and provides significant thermal benefits. It is relatively straightforward to install, though it may require professional input for the best results.
  • Insulated screed: Mixing insulating materials into the concrete screed, which is applied over the slab, combines structural and insulating properties. This method creates an effective barrier against heat loss and is more permanent. However, due to the process's technical nature​​, it typically requires professional installation.
  • Reflective foil insulation: Reflective foil insulation can be laid on the slab before the final flooring is installed. This method works by reflecting heat into the conservatory, enhancing thermal efficiency. It is a cost-effective and easy-to-install solution suitable for DIY enthusiasts​.

Raised floors

  • Underfloor insulation: For floors that have already been raised, installing insulation beneath the floorboards is effective. Materials such as mineral wool, fibreglass, or rigid foam boards can fill the gaps between the joists, preventing heat from escaping through the floor. This method is efficient and relatively straightforward to implement​.
  • Insulated floor panels: Insulated floor panels can replace existing floorboards or be laid on top of them. These panels provide a continuous layer of insulation, reducing heat loss and improving energy efficiency. They are easy to install and suitable for DIY projects, making them popular for conservatory floor insulation​.

Additional considerations

  • Damp-proof membrane: Adding a damp-proof membrane before laying insulation materials is crucial regardless of the floor type. This prevents moisture from penetrating the insulation and causing damage, ensuring its longevity and effectiveness​.
  • Floor coverings: Choosing the right floor covering, such as carpets or rugs, can also add an extra layer of insulation. Carpets, especially those with high stitch counts and thick padding, provide excellent thermal benefits and enhance comfort​.

Conservatory wall insulation

Insulating the walls of a conservatory is essential for improving energy efficiency and comfort throughout the year. Here are some effective methods for conservatory wall insulation:

Internal wall insulation

  • Insulated conservatory wall panels: These panels can be attached to the interior walls of the conservatory. They are highly effective in preventing heat loss and can be easily installed. These panels not only improve thermal efficiency but also enhance the conservatory's aesthetic appeal. This method suits a DIY approach, making it both cost-effective and practical​​.
  • Insulating plasterboard: Insulating plasterboard combines insulation material with plasterboard, offering a streamlined method for improving thermal efficiency. This type of insulation is easy to install and provides a smooth finish that is ready for painting or wallpapering. It’s a practical solution for insulating without extensive construction work​.

External wall insulation

  • Cladding: External cladding involves adding a layer of insulation material on the outside of the conservatory walls, which is then covered with a protective and decorative cladding material. This method is highly effective but may require professional installation due to the complexity of the work. Cladding helps in improving both thermal efficiency and the appearance of the conservatory.
  • Insulated render systems: This involves applying a layer of insulation material to the exterior walls and covering them with render. This method effectively enhances the conservatory's thermal properties while providing a durable and weather-resistant finish. Due to the technical skills required, professional installation is recommended for this method​.

Conservatory window insulation

Ensuring your conservatory is comfortable year-round involves effective window insulation. Here are some methods to improve the thermal efficiency of your conservatory windows:

  • Double glazing: Double glazing is one of the most effective ways to insulate conservatory windows. Modern double-glazed units trap air or gas between two panes of glass, significantly reducing heat loss and preventing cold air from entering. Although replacing all the glass in your conservatory can be expensive, it is a worthwhile investment for those planning to use the space frequently throughout the year​​.
  • Solar control film: Applying solar control film to the windows is a cost-effective method of limiting the amount of sunlight entering the conservatory. This film reflects up to 80% of the sun’s rays, helping to keep the conservatory cool in the summer. However, it is less effective in winter and may reduce window visibility. Ensuring professional installation can prevent peeling and maintain the film's aesthetic appeal.​
  • Draught excluders: Draught excluders around the window frames can prevent cold air from seeping into the conservatory. This is a simple, cost-effective method of enhancing insulation and improving comfort without significant alterations​.
  • Secondary glazing: Secondary glazing involves adding a secondary pane of glass or plastic inside the existing windows. This creates an additional barrier to heat loss and can be a more affordable alternative to replacing the entire window units with double glazing. Secondary glazing is particularly effective in older conservatories where replacing windows is not feasible​​.

By incorporating these methods, you can significantly improve the thermal efficiency of your conservatory windows, ensuring a comfortable space regardless of the season.

Conservatory insulation cost

The average conservatory insulation cost can vary significantly depending on the methods and materials used. Let’s examine the factors that can impact the cost. 

Factors affecting cost and duration

The cost of conservatory insulation depends on several factors:

  • Type of insulation: Materials like polycarbonate, glass, or multi-foil come at different price points.
  • Size of the conservatory: Larger conservatories require more materials and labour.
  • Professional vs. DIY: Professional installation ensures quality but is more expensive than DIY.
  • Geographical location: Prices vary based on local labour rates and material costs.

Installation typically takes 1-2 days for roof insulation and can extend to several days for comprehensive insulation involving floors and walls.

Cost breakdown by size

Here’s a detailed cost comparison for various insulation types based on conservatory size:

Conservatory SizeInternal roof insulationNew timber roof insulationAluminium panel insulation
3m x 2m£2,000 - £4,500£5,000 - £8,000£750 - £1,000
3m x 3m£2,000 - £4,500£5,000 - £8,000£1,000 - £1,100
    4m x 4m£3,000 - £3,750£5,000 - £8,000£2,000 - £2,750
6m x 4m £4,750 - £5,000£5,000 - £8,000£2,750 - £3,000
8m x 6m £6,000 - £7,000£5,000 - £8,000£3,750 - £4,000
These costs are market averages. For a more accurate understanding, get a local installer to QUOTE now!

Examples of floor, wall, and window insulation costs

  • Floor insulation: Depending on the size and type of insulation used, installing underfloor insulation can cost between £500 and £1,500.
  • Wall insulation: Depending on the wall area and insulation material, the cost of using insulated conservatory wall panels can range from £1,000 to £3,000.
  • Window insulation: Depending on the number and size of windows, upgrading to double glazing or adding thermal blinds/curtains can cost between £500 and £2,000.

The cost of insulating a conservatory can vary widely based on several factors. For optimal results, consider consulting with professionals to get accurate quotes and ensure high-quality installation.

DIY conservatory insulation

Insulating a conservatory can greatly enhance its comfort and energy efficiency. While some insulation methods can be tackled as DIY projects, others may require professional expertise for optimal results. Here’s a look at the DIY options for insulating your conservatory's roof, floor, and walls, along with their pros and cons.

Roof insulation

DIY conservatory roof insulation methods include installing reflective foil insulation, using insulation boards, and applying solar control film. These methods generally involve measuring, cutting, and securing insulation materials to the roof structure.

The pros of DIY roof insulation are that it is cost-effective, provides immediate results, and is suitable for small-scale projects. However, potential cons include the risk of improper installation, less durability compared to professional methods, and the risk of leaks if not sealed correctly.

Floor insulation

You can lay insulation boards or rolls under the flooring and install underfloor heating mats for floor insulation. This involves removing the existing floor covering, laying the insulation material, and then replacing the floor covering.

This approach has the benefits of increased comfort and energy efficiency and relatively simple installation. On the downside, it can be time-consuming, requires lifting the existing floor, and may involve structural complications.

Wall insulation

Methods for DIY wall insulation include applying insulated plasterboard, installing insulated conservatory wall panels, and using thermal wallpaper. This process involves securing the insulation material to the wall frame and finishing with plaster or decorative covering.

The advantages are improved thermal efficiency and enhanced comfort. However, it can be labour-intensive and, if not properly installed, can cause moisture issues.

Professional installation

While DIY conservatory insulation can be cost-effective and rewarding, hiring a professional ensures proper installation and long-term benefits. Professionals bring expertise and efficiency, addressing structural issues that may not be apparent to DIY enthusiasts.

What is the best insulation for a conservatory?

There isn't a single "best" insulation method for conservatories; the choice depends on individual needs. Choosing the best insulation for a conservatory depends on various factors, including budget, aesthetics, desired efficiency, and the specific parts of the conservatory you want to insulate. Here's a breakdown of the best options based on these factors:

Best sustainable insulation

Tiled roofs, like the SupaLite Tiled Roof, are highly effective and sustainable. They feature 185mm of insulation and a waterproof membrane, offering excellent thermal efficiency with a U-value of 0.15 W/m²K. These durable roofs can significantly reduce energy bills​.

Best cheap insulation technique

The most budget-friendly option is to install a thicker polycarbonate roof or add an extra layer. While not as efficient as other methods, it is cost-effective and offers moderate insulation improvements.

Best aesthetic option

Combining a glass roof with insulated panels, like the SkyVista from SupaLite, maintains natural light and thermal efficiency. This option balances aesthetics and functionality, keeping the conservatory bright and airy​​.

Best insulation for a glass conservatory

Solar control film and thermal blinds are effective methods for a glass conservatory. The film reflects sunlight, reducing heat in summer, while thermal blinds retain heat in winter. These options are cost-effective and maintain aesthetic appeal.

Alternative ways to make your conservatory warmer

To keep your conservatory warm without extensive renovations, consider these effective and practical methods:

  • Tinted glass: Installing tinted glass can help retain heat during the colder months and reduce glare from the sun in the summer. This is an effective way to improve the thermal efficiency of your conservatory while maintaining its aesthetic appeal.
  • Fitting curtains and blinds: Curtains and blinds are simple yet effective solutions for retaining heat. Thermal blinds and heavy curtains create an extra insulation layer, preventing heat loss and blocking drafts. They also allow you to adjust light and privacy levels.
  • Multifoil and thermal wadding insulation: Using multifoil insulation or thermal wadding is a cost-effective DIY method. This involves layering insulation materials under the roof and securing them in place. While this can significantly reduce heat loss, it might not be as effective as professional insulation, but offers a good balance of cost and efficiency.
  • Underfloor heating and rugs: Installing underfloor heating can provide a steady source of warmth from the ground up, keeping the conservatory cosy even in winter. If underfloor heating is not feasible, adding thick rugs or carpets can help insulate the floor and reduce heat loss.

Find local conservatory insulation installers near you

When considering conservatory insulation, comparing multiple quotes is crucial to ensure you get the best value for your money. Different installers may offer varying prices, materials, and methods, so gathering a few quotes allows you to make an informed decision.

For optimal results and peace of mind, always consider professional installation. It ensures that insulation materials are properly installed, maximising efficiency and durability. Don't wait to make your conservatory a comfortable, year-round space.

Get started today by finding local conservatory insulation installers near you and requesting multiple quotes to find the best deal for your needs. Transform your conservatory into a warm, inviting space - request your quotes now!

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