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Flat-Pack Homes and Energy Efficiency

Last modified: 09.07.2024
Street view of modern new-build homes featuring a variety of façade finishes, including silicone render. These energy-efficient homes demonstrate the visual appeal and thermal performance achievable with external wall insulation. EWI Store supplies a full range of EWI systems to suit contemporary architectural designs.

In an era when sustainability and efficiency are at the forefront of societal concerns, flat-pack homes are emerging as a compelling solution in the housing market. These prefabricated homes, known for their affordability and ease of assembly, also impact energy efficiency. This blog will explore how flat-pack homes revolutionise the housing industry, offering economic and environmental benefits.

Flat-pack homes, or prefabricated or modular homes, are manufactured in sections at a factory and then shipped to the building site, where they are assembled. This method streamlines the building process, providing a quick and efficient alternative to traditional on-site construction. The concept of flat-pack homes has been around for decades but has seen a resurgence due to technological advancements and a growing interest in sustainable living. The construction of flat-pack homes begins in a controlled factory environment where various sections of the house—such as walls, floors, and roof panels—are built. These components are then transported to the site, where they are pieced together, often with the aid of cranes and skilled labour. This assembly process can take just a few days, significantly reducing the time it takes to build a home compared to traditional methods. Flat-pack homes can be constructed using various materials, each offering different benefits in terms of cost, durability, and energy efficiency.

SIPs are among the most popular materials for flat-pack homes due to their excellent insulation properties and strength. These panels consist of an insulating foam core sandwiched between two structural facings, typically made of oriented strand board (OSB). SIPs are known for their energy efficiency, as they provide a high level of airtightness and continuous insulation, reducing heating and cooling costs. Top-down view of prefabricated timber frame panels assembled on-site. These panels, filled with insulation between OSB boards, offer fast and effective construction with excellent thermal and acoustic properties. Available through EWI Store, our insulation-compatible systems support off-site and modular construction.

ICFs are another common choice for constructing flat-pack homes. These forms are made from two layers of reinforced concrete with insulation between them. ICF homes are highly durable and resistant to extreme weather, fire, and pests. They also provide superb insulation, which helps maintain a consistent indoor temperature and reduce energy consumption. Close-up of interlocking EPS blocks forming an insulated concrete formwork system, with embedded steel reinforcement. This energy-efficient construction method improves thermal performance and structural strength, ideal for modern low-energy buildings. EPS formwork and accessories are available from EWI Store.

BlokBuild is a newer method involving large, modular blocks that interlock to form the home's structure. These blocks can be made from various materials, including wood, concrete, or composites, and are designed for quick assembly. Homes built with BlokBuild technology are modular, scalable, and flexible in design. Crucially, BlokBuild blocks are filled with insulation. For example, recently completed new build homes featured on Grand Designs are manufactured by BlokBuild. The prefabricated building blocks are filled with mineral wool, offering significant thermal and acoustic insulation

Light gauge steel framing is used for its durability, resistance to termites, and fireproof qualities. It's lighter than traditional steel frames, making it easier to transport and assemble. This material is often used for interior and exterior framing and is known for its strength, making it suitable for multi-storey buildings.

Traditional timber framing is still popular for flat-pack homes. It offers a classic aesthetic and robust structure. Timber is a renewable resource, making it an environmentally friendly option. It also has natural insulating properties and design flexibility.

One of the standout features is their superior insulation. The components used in these homes are often designed with high-performance insulation materials that far exceed traditional construction standards. This reduces heat loss during winter and less heat gain in summer, leading to lower energy consumption for heating and cooling. Flat-pack homes benefit from precision engineering and factory-controlled conditions during their manufacturing process. This ensures a high level of airtightness, minimising drafts and leaks that can compromise energy efficiency. An airtight home maintains a consistent indoor temperature more effectively, reducing the need for excessive heating or cooling. Many flat-pack home manufacturers incorporate energy-efficient appliances and systems into their designs. These include high-efficiency heating, ventilation, and air conditioning (HVAC) systems, as well as energy-saving lighting and water-heating solutions. These features further contribute to the home's overall energy efficiency, helping to lower utility bills and reduce the household’s carbon footprint. The modular nature of these systems makes them particularly well-suited for integrating renewable energy sources. Solar panels, wind turbines, and rainwater harvesting systems can be easily incorporated into the design, allowing homeowners to generate their own energy and reduce reliance on non-renewable sources.

The streamlined construction process translates to significant cost savings. These homes are typically more affordable than traditionally built houses because they reduce labour time and minimise material waste. The cost savings extend beyond construction, as the energy-efficient features reduce ongoing energy bills, providing long-term financial benefits. The pre-fabrication process means that the homes can be assembled on-site in a fraction of the time it takes to build a traditional home. This reduces labour costs and allows homeowners to move in sooner, reducing the financial strain of long construction timelines. The precision manufacturing process produces less material waste than conventional construction methods. Components are cut to exact specifications in a factory setting, ensuring minimal offcuts and excess materials. Any waste generated is also easier to manage and recycle in a controlled factory environment. Flat-pack homes contribute to a lower carbon footprint in several ways. The efficient use of materials, reduced need for on-site machinery, and lower energy consumption during the home’s lifetime all help decrease the overall environmental impact. Furthermore, the ability to incorporate renewable energy systems means that these homes can operate with minimal reliance on fossil fuels.

Planning permission for prefabricated homes is similar to any new builds.

There are two key types: Outline Planning Permission (OPP) and Detailed Planning Permission (DPP). OPP confirms that a plot is suitable for residential development but does not permit the construction of a specific home design. Within three years of receiving OPP, you must secure DPP, which allows you to build a home according to detailed specifications concerning design, materials, layout, and location on the plot. Before purchasing a plot for your build, consider several regulatory and environmental factors. Check if the plot is in a conservation area or has historical planning rejections, which might indicate potential complications. Understanding any restrictive covenants in the title deeds that might limit development types or styles is essential. Additionally, ensure the plot has proper access, potentially affecting future maintenance costs and responsibilities. Preparing your planning permission application involves compiling detailed documents and plans. You'll need precise site plans, building designs, and possibly artist’s impressions or 3D models. Environmental impact assessments, including surveys for protected species and tree preservation orders, are critical. Information about infrastructure—such as access to public roads and utilities—and risk assessments for factors like soil contamination and flooding risks are also necessary. Once your application is ready, submit it through your local council's digital platform or in person. The process involves consultations with the local authorities, environmental agencies, and possibly neighbours. A planning officer will inspect the site, and you must pay a variable application fee. If your application is initially rejected, maintain communication with the planning officer, as many are open to discussing revisions that can lead to approval without an additional fee. If necessary, you can also appeal the decision, supporting your appeal with documentation demonstrating compliance with local regulations.