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Leka Xi Modular Systems – The perfect, energy-efficient living space addition for your home.
At Thermolite, we are an approved Leka installer of the Xi Modular Home Extension, Prefabricated Conservatory Base & Walls and the Garden Room Solution. We install these systems across the North West, providing lightweight, tiled replacement roofs and high-performance solutions for conservatories and extensions.
Leka Xi Modular Home Extension
The Leka Xi Modular Home Extension is one of the UK’s premium systems.
It is typically installed on concrete pads, reduces groundworks, speeds up installation, and cuts mess and disruption – ideal for a new build, conservatory, a single-storey extension, or replacing an underperforming space.
Meticulously engineered by Leka and fabricated by Thermolite, this home extension improves the energy efficiency of your home and looks aesthetically pleasing too.
Completely bespoke to you, when you choose an Xi Modular Home Extension, you will have peace of mind that your living space is tailored to you and insulated for year-round comfort.
Leka Xi: Prefabricated Conservatory Base & Walls
The Leka Xi is a clean, sustainable alternative to a traditional brick-built conservatory.
The system saves time, mess and stress and is typically installed on either concreate pads or structural ground screws.
It is carefully engineered by Leka and is perfect for upgrading an outdated design, or for building a brand new conservatory.
Similar to the Modular Home Extension, this system is completely unique to you. It also offers unparalleled quality, performance and style. With many benefits including efficiency 365 days a year, it is a fantastic extension option.
Leka Xi Garden Room Solution
The Leka Xi Garden Room is a premium, composite system that is built for life.
They are beautiful, insulated and crafted with no timber, corrosion and provide zero condensation.
The spaces are highly insulated with market leading U-Values and are built in weeks, not months thanks to their precision- engineered and Thermolite-assembled models.
Installed by our experts, the Leka Xi Garden Room reduces mess and disruption, making it a great option for homeowners like you. With a whole host of benefits, this living space is also completely tailored to you.
Benefits Of Our Leka Xi Systems
All of our Leka Xi systems are completely bespoke to you.
Our ethos here at Thermolite is to provide high-quality living space solutions to all of our customers across the North West and our Leka systems offer exactly that.
Learn more about each of the systems we offer by heading to the Leka Systems and Leka Garden Rooms websites.
We have an excellent team of professional installers, so when you have chosen your system, they will be on hand to offer you advice as well as fit your new living space in a matter of weeks.
Contact us for more information today.
The Leka Xi Wall & Base System – How It Works
If you are curious to know how the Leka Xi Wall & Base System works, see the breakdown below! The system delivers a lighter structure with superior base insulation – ideal for conservatory upgrades, extensions, or single-storey home extensions.
Step 1 – Adjustable Feet
Depending on the ground conditions at the installation site, the supporting feet can typically be installed on basic concrete pads, reducing the need for extensive groundwork.
The adjustable capability of the feet accommodates varied floor levels, ensuring a precise and level finish upon completion.
Step 1b – Ground Screws
Ground screws provide an excellent alternative to concrete pads for foundations.
These innovative, structurally tested products are suitable for various ground conditions and are typically installed in under a day. Installation companies also offer ground surveys, saving you hassle and time.
Step 2 – Base System Installation
After laying a sufficient membrane over the ground area, the pre-manufactured GRP base system is installed. This includes a floor perimeter beam and structurally advanced supporting joists, thermally enhanced with PIR insulation sheets placed between them..
Step 3 – Modular Wall System
The Leka Xi wall is highly modular. Each wall is custom-made to the required height and width, then delivered in lightweight sections for rapid installation and a clean site.
Step 4 – Roof Installation
Once the modular framework is installed, the appropriate roof system is added. Various roof options can complement your installation, including:
- Flat Roof
- Orangery Roof
- Tiled Roof
Step 5 – Insulation
High-grade EPS insulation is pre-cut to size and neatly installed between the thermally efficient GRP framework.
Step 6 – Plastering and Flooring
After installing windows and doors, internal energy-efficient plasterboards are added, along with high-grade Weightrock flooring. This provides a surface ready for plastering and the application of your preferred floor covering.
Step 7 – External Finish
Once the structure is complete, choose your finish:
• Maintenance-friendly GRP brick, timber, or stone skins (quick to install)
• Render-ready board to receive a wet render coat by a plasterer
• Bespoke/combined finishes on request
Summary: Fast Installation
In most cases, the Leka Xi system, including any roof, can be installed and completed in less than a week, eliminating the need for heavy groundwork, reducing mess, and shortening build time.
Because the Leka Xi system is a permanent, high-quality structure that meets Building Regulations, it is classed as a “proper” extension rather than a temporary structure like a conservatory. When it comes time to sell, your home will be valued as having an extra usable room. We can even finish the exterior in brick-slip or render to ensure it blends seamlessly with the rest of your house.
You actually get more room for your money. Traditional brick walls are very thick, which eats into your internal floor area. Leka Xi walls are significantly thinner while providing better insulation than a standard cavity wall. In most cases, you gain up to 52% more internal floor space, giving you more room for that dining table or sofa you’ve been eyeing.
Absolutely. This is where the Leka Xi systems shines Traditional builds require heavy diggers for deep foundations and skips for tons of soil. The Leka Xi systems are modular and lightweight, meaning components can be carried through a standard side gate or even through the house if necessary. They usually sits on specialised ground screws or concrete pads, requiring zero heavy machinery.
Yes. Unlike old-fashioned conservatories that are “too hot in summer and freezing in winter,” the Leka Xis are built more like a modern house than a sunroom. They use high-performance GRP (Glass Reinforced Plastic) and thick PIR insulation. This creates a thermal break, meaning heat stays inside during the winter and is reflected away in the summer, keeping your energy bills manageable.
Unlike traditional brick-and-mortar builds that can take months, the Leka Xi systems are designed for speed. Because the components are precision-engineered and prefabricated off-site, a typical installation (including the base, walls, and roof) can be completed in weeks not months. This significantly reduces the time you spend living on a “building site.”