Flat-roofed house extension

The installation of a flat roof is less complex and potentially less expensive than its sloping counterpart. The simplicity of the structure means that construction costs and times can be reduced, not to mention the advantages in terms of maintenance and long-term durability.

Modern construction technologies have considerably improved the energy performance of flat roofs. With the use of high-quality insulating materials, a flat-roofed house extension can offer excellent thermal insulation, thus reducing heating and air-conditioning requirements. This energy efficiency translates into significant savings on energy bills.

While a pitched roof can also be insulated effectively, the techniques and materials needed to achieve a comparable level of insulation can be more expensive or complex to implement, due to the very structure of the roof.

One of the major advantages of the flat-roof extensions that we offer our customers is the increase in natural light. Roof and front infill options, such as polycarbonate and glass, maximise light while providing effective insulation. In addition, the various opening solutions, such as sliding leaves or knock-out doors, ensure a smooth transition between inside and outside, in a way inviting nature into the house. Tempted? We understand why!

When choosing the materials for your extension, think about sustainability and ecology. Vegetated roofs or recycled insulation are not only in keeping with the times, but they can also have a positive influence on your application. Town halls are increasingly favouring projects that are part of an environmental protection approach.

The surface area of the house extension is a determining factor in the calculation of the price of a flat-roofed house extension. As you can imagine, the more space to be added, the more materials, labour and time the project will require, which has a direct impact on the overall budget.

Indeed, each additional square metre means an increase in the need for a foundation, load-bearing structure, roofing materials, and electrical and plumbing systems, if necessary.

In addition, the size of the room can also impact indirect costs such as building permits or soil studies, which are often required to validate the feasibility of the construction site. It is therefore essential to properly assess the scale of the planned extension in order to better anticipate the associated expenses, taking into account both immediate desires and potential future changes in the living space.

Each material has its own characteristics in terms of value, durability, maintenance and aesthetics. They also offer different possibilities for customising the extension according to taste and available budget.

The use of high-end materials such as aluminium can significantly increase the price of the project. However, it is important to consider the longevity and maintenance costs, as initial savings on cheaper solutions could result in additional expenses in the long term.

At AKENA, we favour aluminium because of its many qualities that meet our high standards in construction and design. It is distinguished by its lightness and robustness, offering unparalleled resistance to extreme weather conditions, from high heat to corrosion. It is an ideal choice for structures requiring both strength and aesthetics, as it lends itself to various finishes and multiple colours, allowing for complete customisation to adapt perfectly to the existing architecture. It can even be combined with wood finishes to give a warm touch to your home enlargement, or with glass in the front or roof for maximum light.

Here is an idea of the price of a flat-roofed house extension according to its composition:

• Aluminium extension with wooden finishes: between €2,000 and €3,000/m².
• Glazed extension: between €1,800 and €2,200/m².

Flat-roofed extensions have the advantage of offering clean, modern lines. Various finishes add a unique aesthetic dimension to the extension. At AKENA, for example, we offer a variety of cornice finishes that can vary between traditional, contemporary or more designer styles.

Other specific decorative elements, such as flames, crests or forget-me-not motifs, allow the structure to blend harmoniously with the existing architecture or give it its own identity. These details, although often subtle, require special expertise and additional materials, thus influencing the overall budget.

However, advanced roof customisation is not just about aesthetics: it can also include improved functionality, such as special insulation solutions. It is even possible to opt for a glass roof to benefit from optimal light.

At AKENA, we designed and installed a custom-made house extension with a flat roof. This construction includes free-standing sandwich panels and an elegant glass dome with a double slope on the roof. Designed to accommodate a 24 m² kitchen and equipped with various comforts, the entire project was completed for a total cost of €60,684.