How to Insulate a Summer House

Summer houses have gained tremendous popularity as versatile garden spaces. To fully enjoy it year-round, one crucial aspect often gets overlooked: insulation.

Insulating a summer house is the key to making it a comfortable haven, no matter the season. It not only regulates the temperature inside but also reduces energy consumption. This means you can savour the tranquil ambience, even on chilly winter days or scorching summer afternoons.

Read on and join us as we explore the steps to create your cosy oasis!

Understanding the Importance of Insulation

BillyOh Outpost Insulated Building
BillyOh Outpost Insulated Building

Insulating a summer house offers benefits that enhance its usability and comfort. First, proper insulation enables effective temperature regulation. It keeps the interior cool during hot summer and warm in colder seasons. This creates an inviting and comfortable environment for various activities.

Second, insulation contributes to energy efficiency by reducing heat transfer. Well-insulated summerhouses requires less energy to cool or heat. This results in lower utility bills and reduced environmental impact.

Insulation also plays a vital role in noise reduction. It creates a barrier against external sounds. This ensures a peaceful and tranquil atmosphere inside the summer house.

Without insulation, maintaining a comfortable temperature becomes a challenge. Heat easily escapes through walls, roofs, and flooring while cold air seeps in. This can lead to uncomfortable conditions, limiting the usability of the space. Given these challenges, it is crucial to implement a proper insulation strategy.

Selecting Insulation Material

Wall insulation being installed

(Image Credit: Wallpaper Flare)

Several types of insulation materials are suitable options. Let’s explore a few common choices:

Fibreglass insulation

This widely used material consists of tiny glass fibres and is available in rolls or batts. Fibreglass is relatively affordable and offers good thermal performance. However, proper installation is crucial to avoid gaps that can reduce its effectiveness.

Foam board insulation

Made from polystyrene or polyisocyanurate, foam board insulation provides excellent thermal resistance. It comes in rigid panels that are easy to cut and install. While foam board insulation offers high insulation performance, it tends to be more expensive.

Cellulose insulation

Composed of recycled paper or plant fibres, cellulose insulation is an eco-friendly choice. It can be blown into wall cavities or applied as loose-fill insulation. Cellulose insulation offers good thermal performance and is effective at reducing noise. However, professional installation may be required.

Consider your budget, installation process, and insulation performance when selecting the material. The best one should align with your desired level of insulation and budget.

Insulating Walls, Roof, and Flooring

BillyOh Canvas Insulated Building
BillyOh Canvas Insulated Building

Insulating the walls of your garden summer house involves a step-by-step process. Begin by inspecting for gaps and air leaks. Seal them with caulk or weatherstripping, if there’s any.

Next, measure and cut insulation materials to fit between the wall studs, ensuring a snug fit. Secure the insulation in place with staples or adhesive, and cover it with a vapour barrier if needed. Finally, install drywall or panelling over the insulation to complete the process.

Insulating the roof is equally crucial to prevent heat transfer. Use insulation materials suitable for roofs, such as foam board or spray foam. Ensure proper coverage to minimise thermal bridging.

For the flooring, add an extra layer of insulation, such as foam or cork underlayment. Do this before installing the final flooring material. This helps reduce heat loss through the floor and enhances overall insulation performance.

Windows and Doors

BillyOh Studi Insulated Garden Room
BillyOh Studi Insulated Garden Room

Windows and doors can be major sources of heat loss or gain and allow drafts to enter the space. Properly insulating them is essential for maintaining a comfortable interior temperature.

To insulate windows, consider using weatherstripping to seal gaps and prevent drafts. Apply window film for an extra layer of insulation by reducing heat transfer. For even greater insulation performance, consider installing double-glazed windows. Such an addition comes with two panes of glass with a layer of insulating gas in between.

When it comes to doors, sealing gaps around the edges is crucial. Weatherstripping and door sweeps can be used to create a tight seal. Additionally, using draft stoppers at the bottom of doors can further enhance insulation.

BillyOh Insulated Summer Houses

When it comes to achieving excellent insulation, BillyOh Insulated Summerhouses make reliable choices. With their innovative designs and high-quality materials, each model offers exceptional insulation capabilities.

Enjoy all the relaxation of a summerhouse but with the added benefit of in-built insulation! Browse our available units here and get free delivery across most mainland UK!


Insulating your summer house is a crucial step for achieving year-round comfort.  With proper insulation, you can enjoy a peaceful retreat, no matter the season. Start your insulation journey and transform your summer house into a welcoming sanctuary!

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