How much does a flat roof extension cost?

A flat roof extension increases the living area of a house by adding a room to create a new living space. A flat roof extension is an aesthetically pleasing, modern solution that offers great flexibility.

It's important to have a good estimate of the price of this flat roof extension if you want to bring this project to life under the right conditions. AKENA will work with you to create the layout you want, thanks to expert advice and expert craftsmen.

To estimate the price of a flat-roofed house extension, start by defining the project in detail, including the size and intended use. Do you need a light-filled house extension, a secluded office for teleworking, an extra bedroom or perhaps an open-plan kitchen overlooking the garden? Each of these projects has its own specificities that will influence the choice of materials, construction techniques and, consequently, the overall cost of the extension.

Next, check local regulations and the cost of any necessary permits. The choice of materials has a major influence on the budget, so compare the options for the structure, insulation and finishes. Get quotes for labour costs, which vary according to the region and the complexity of the project.

Don't forget to include costs for electricity, plumbing, insulation and waterproofing, which are essential for the comfort and durability of the extension. You should also budget for finishing and interior fittings, and add a margin of around 10-20% to cover any unforeseen circumstances.

Finally, explore the financing options available. Consulting a professional from the outset can help you establish an accurate budget and avoid surprises. You can count on AKENA to provide you with a fair estimate of the cost of this conversion.

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Flat roof extensions are popular for their design, which adds a contemporary touch to any home. In addition to its elegant appearance, this enlargement option is often less expensive than one involving a traditional roof. However, its appeal is not limited to its visual appeal.

In terms of durability, a flat roof is designed to stand the test of time with little maintenance required. Thanks to its solid design and the high-quality materials used at AKENA, it offers lasting protection against the elements and potential damage. In addition, its flat surface allows for the installation of skylights, providing a natural source of light that can illuminate the interior of the extension, reducing reliance on artificial lighting and promoting a bright and welcoming interior atmosphere.

When you're considering enlarging your living space, choosing a flat-roofed extension is a contemporary and elegant option. But how much does it cost per square metre? The cost of a house extension with a flat roof can vary considerably, typically between €900 and €3,200 per square metre if you want durable materials and a custom design. Depending on the surface area you require, here's an estimate of the budget needed:

10 m² flat roof house extension: between €9,000 and €32,000.
20 m² flat roof house extension: between €18,000 and €40,000.
Extension to a 30 m² flat-roofed house: between €27,500 and €50,000.
40 m² flat-roofed house extension: between €37,000 and €63,000.
Extension to a 50 m² flat-roofed house: between €45,000 and €90,000.
Flat-roofed house extension of 60 m² or more: between €50,000 and over €100,000.

*These price ranges are influenced by several factors, such as the choice of materials, the complexity of the architecture and the type of flat roof envisaged.

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When it comes to style, it's best to encourage a dialogue with the existing context! Opt for simple shapes and uncluttered designs, inspired by local architectural features. This approach is particularly appropriate if you have to comply with local planning regulations. However, to meet aesthetic and performance requirements, forget bricks and breezeblocks! When it comes to house building and extensions, there's no denying that wood and aluminium stand out for their unique characteristics.

Aluminium: the ultimate in contemporary enlargements

Aluminium is a modern, versatile material, perfectly suited to contemporary construction. Its lightness, strength and ease of handling make it a first-rate choice for framed structures. It is weather-resistant and low-maintenance, while offering a wide range of finishes to suit all architectural styles. The icing on the cake: it offers outstanding insulation, which can be further optimised with a powder-coated finish with a total thermal break, like that offered on our LOFT and LOFT A+ models.

Wood finish

Wood composite is chosen for its warm charm and natural appearance, making it a popular material for house extensions. That's why it's used as one of the materials used to finish our AKENA house extensions.

Each material has its own specific features to consider, depending on your needs, budget and vision. Need advice on choosing your material? Count on AKEMA to create your ideal outdoor space that's both functional and aesthetically pleasing.

The importance of insulation for your enlargement

Insulation is essential for maintaining a comfortable indoor temperature. It reduces heat loss in winter and minimises excessive heat gain in summer.

Insulation also contributes to better indoor air quality by limiting cold draughts and temperature fluctuations, which can cause damp and encourage the growth of mould.

In addition to the thermal aspects, the insulation of a flat-roofed extension also provides soundproofing, which should not be overlooked for day-to-day living comfort.

Calling in professionals to build a flat roof extension is highly recommended, if only to ensure that the work complies with the latest standards.

With AKENA, you benefit from technical expertise that supports you from A to Z. With over 40 years' experience, our passionate craftsmen can offer you solutions that are aesthetically pleasing, durable and functional, all tailored to your budget and your needs.

Calling on experts for your flat roof addition is a welcome step that will simplify your life in many respects: planning permission, waterproofing and insulation management, choice of materials and work safety, etc.

A flat roof extension project can be financed in a number of ways: through personal savings, by taking out a loan, or by applying for grants and subsidies. In particular, projects to improve the energy efficiency of the home can receive a helping hand from the government (zero-rate eco-loan, MaPrimeRénov', etc.).

Despite these schemes, a flat roof extension represents a significant investment. That's why AKENA can help you find financing solutions that fit your budget. We offer flexible payment plans and work closely with financial partners to help you make your dream a reality.

Whatever the size of your project, we're here to support you every step of the way, from concept to completion. Contact our experts today to discuss financing options for your flat roof extension.