Price of extension and enlargement of house per m2

House enlargement is a challenging and rewarding property project that offers many advantages. In addition to expanding your living space to meet growing family needs or simply to add an extra touch of comfort to your daily life, it also significantly increases the value of your property on the property market! Nevertheless, it is crucial to fully understand the costs associated with such a project in order to develop a precise and realistic budget, which will enable you to realise your dream of expansion without running into any unpleasant financial surprises... At AKENA, we specialise in house extensions with the best value for money. That is why we are particularly competent in the in-depth analysis of the various factors to be taken into account when estimating the cost of a house extension. Construction materials, labour costs, ancillary costs... we want to provide you with all the information you need to make an informed decision and prepare your extension project in the most efficient way possible.

A well-planned house enlargement can not only increase the value of your property, but also transform your living space into a place where it is good to live. But how can you estimate the cost of such a project? We will guide you through the main factors that influence the price of a house extension, so that you can start to evaluate this development for your home.

The amount of work required for a house extension is directly related to its surface area in square metres. This is often the main factor influencing the cost of the project! The larger the surface area to be covered, the more building materials, skilled labour and time you will need to complete the work, which will inevitably increase the final cost. But beware! The larger your project, the less the price per square metre can be.

In addition, the style of the extension plays a crucial role in determining the price. If you opt for an off-the-shelf collection, you could benefit from a more economical but perhaps less personalised solution. Conversely, a complex, custom-made design that is designed to blend in harmoniously with the existing architecture, although more aesthetically pleasing, will require a larger budget due to the need for specific materials and perhaps advanced construction techniques. Are you considering something more modest and simple? This option may be more affordable, but it is essential not to compromise the quality and structural integrity of the extension. Each of these options, with its specificities, will have a significant impact on the final estimate of the cost of your extension, so it is crucial to consider them carefully in relation to your budget and your expectations in terms of aesthetics and functionality.

Akena Véranda - Salle de réception lumineuse

Aluminium, as a material choice for a house extension, is distinguished by its unique combination of lightness, strength and design flexibility. It is a popular choice for window frames, doors, and even for entire extension structures, especially for conservatories or orangery-type extensions. From a financial point of view, although the initial investment in aluminium may be higher than that for traditional materials such as wood, its long-term advantages may justify the additional cost. Aluminium does not rust, is weatherproof and requires little maintenance, which can result in savings on maintenance costs in the long term. In addition, its thermal insulation efficiency has been improved thanks to modern technologies such as thermal break, making aluminium extensions competitive in terms of energy performance. The cost of aluminium varies according to fluctuations in the metals market, but the investment can vary significantly depending on the complexity of the design, the quality of the chosen material, and the insulation specifications. By incorporating aluminium into your extension project, you are investing in durability and aesthetics, potentially increasing the value of your property while benefiting from a low-maintenance structure. As a general rule, the price of an aluminium extension varies between €2,000 and €3,000 per square metre. Finally, for an aluminium extension with large areas of glazing, you can expect to pay between €1,800 and €2,200 per square metre.

Akena Véranda - Salle à manger sur piscine

How does the workforce influence the budget for an extension?

The cost of labour varies significantly depending on the region and the skill level of the tradespeople hired. On average, hourly rates for tradespeople can vary from €30 to €60 per hour excluding VAT, depending on their speciality. It is important to budget for professional services such as those of an architect or structural engineer, which are often necessary to ensure compliance with building standards and optimise the integration of the extension into the existing building.

The costs associated with the energy requirements of your enlargement

With the current thermal regulations (RT 2020), aimed at reducing the energy consumption of new buildings and significant extensions, insulation is becoming an important factor in the planning of your project. Investing in high-quality insulation may increase initial costs, but will result in substantial energy savings in the long term. Modern heating, ventilation and air conditioning (HVAC) systems also represent a significant initial investment, but are essential to guarantee the comfort and energy efficiency of the extension.

Plumbing and electricity are often major expense items for a house extension.

If your project involves an additional kitchen or bathroom, the extension will require significant plumbing work. The electrical implications can also be significant, especially if you are planning a large area. These costs depend largely on the proximity of existing electrical and plumbing lines and the complexity of the work to be done.

The estimated costs presented below are likely to vary considerably depending on several factors, including the geographical location of the project, the materials used, labour and other criteria mentioned above that play a crucial role in determining the final budget. However, let's look at some average prices per surface area.

For extensions of less than 20 m², such as the addition of a small office to work from home more efficiently or a conservatory to enjoy the sunny days, the estimated expenses are between €20,000 and €30,000. These projects, ideal for those wanting a new functional space without undertaking extensive building work, generally do not require any major modifications to the existing structure. This helps to make the process relatively simple and economical, while offering an excellent return on investment in terms of added value to the property.

Extension projects from 20 to 40 m², for example to enlarge a living room to create a more spacious and welcoming living space, or to add one or two bedrooms to accommodate a growing family, involve costs ranging from €30,000 to €60,000. Although these projects are more ambitious and may require additional foundation work, structural adjustments to maintain the integrity of the building, and sometimes even the demolition of certain load-bearing walls, they offer a significant opportunity to improve the functionality and appeal of the house, which justifies the investment.

For extensions of more than 40 m², which include major additions such as the construction of a new wing with master bedroom suites with adjoining bathrooms, or large kitchens equipped with modern technology, the cost can rise from €60,000 to over €100,000. These large-scale projects require careful planning and an in-depth analysis of the structural and aesthetic implications to ensure perfect integration with the existing building. Obtaining specific permits, potential modifications to the exterior appearance of the house, as well as the involvement of architects, interior designers and landscape architects to harmonise the additional space with the property as a whole, are all factors that increase costs, while offering the possibility of creating customised living spaces that perfectly meet the needs and desires of the owners.

To summarise:

Surface area of the enlargement	Lowest prices observed (€)	Highest recorded prices (€)
10 m²	9 000	32 000 €
20 m²	18 000 €	40 000 €
30 m²	27 500 €	50 000 €
40 m²	37 000 €	63 000 €
50 m²	45 000 €	90 000 €
60 m²	+ 50 000 €	+ 100 000 €

22 396€

AKENA house extensions offer a whole host of customisation options. Materials and textures, colours, design... request your free and transparent quotation now for an initial price estimate! Here are some examples of current prices, as well as details of our flagship collections, which are highly popular with homeowners.

Type of extension by AKENA	Surface area of the extension	Price including tax for the realisation (from)
Living room extension	14 m²	38 220 €
Kitchen extension	24 m²	60 684 €
Conservatory extension (LOFT)	19 m²	29 533 €
Conservatory extension to living room (LOFT)	20 m²	38 464 €

Price of an AKENA house extension according to type: LOFT collection

The LOFT collection from AKENA is a true representation of modernity and elegance. Characterised by its interior finish with flat ceiling, this collection offers a generous volume accentuated by straight lines, promising a harmonious integration with the existing architecture of your home. But the LOFT collection doesn't just seduce with its design; it also excels in terms of performance. Thanks to its ultra-insulating roof made up of multiple layers of insulating materials, it provides a high level of thermal and sound insulation. This winning combination of contemporary aesthetics and energy efficiency makes the LOFT collection the ideal choice for those looking to enlarge their living space without compromise.

LOFT A+ Collection: insulation, innovation and efficiency

For those looking for an even more innovative extension solution, the LOFT A+ collection also offers undisputed advantages such as excellent value for money. This improved version is based on a roof designed with a single bevelled insulating panel, with a thickness varying from 76 to 211 mm. It incorporates a 3% slope, not only for a distinctive design but also to optimise rainwater runoff. Covered with an EPDM membrane, the roof guarantees a perfect seal with the gutter, eliminating the risk of infiltration. In terms of insulation, the R-value of the LOFT A+ collection varies between 5 and 8.26 depending on the depth of the roof, thus offering flexibility in terms of energy performance adapted to your specific needs.

Consult the prices of our other extensions here.

If you are the proud owner of a house, you may already know how essential it is to have a space that matches your changing lifestyle. When space starts to run out, instead of moving, consider a whole new approach: extending your house. With personalised solutions and a team of qualified professionals at your side, extending your home can offer undeniable practical and aesthetic advantages. Here are a few reasons why this option could well be your best property decision.

Create a home that suits your lifestyle

Your home should be a reflection of who you are and how you like to live. House extension offers the freedom to customise your spaces to better suit your current needs. Whether you want a new bedroom to accommodate a growing family, a home office for better concentration, or even a gym for a healthier life, the possibilities are endless. By choosing to enlarge your home, you can design spaces that are perfectly suited to your lifestyle. More than just adding square metres, it's a renewal of your interior space and your daily comfort that is within reach.

A process supported by certified professionals

A house extension is a major project that requires a variety of skills, from architecture to construction. One of the most important advantages is having a team of specialists to guide you through the process. These professionals can turn your ideas into reality by providing innovative solutions while complying with current regulations. The experience of these seasoned builders not only ensures quality design and construction, but also guarantees that your project will be managed efficiently and on time. You can therefore begin your extension project with the confidence that every step will be taken care of.

An aesthetic that blends in with the existing architecture

Concerns about the appearance of your home after an extension are legitimate, but the results can in fact be quite harmonious. When you work with professionals, the transition between the original house and the enlargement is smooth. Imagine a natural undulation of the roof lines, materials in perfect harmony with those of your main house, or a play of natural light that continues from the old ‘wing’ to the new section.

Beyond the immediate advantage of increased living space, a house extension is also a long-term investment. Depending on your location and the specifics of your property market, adding rooms can significantly increase the resale value of your property. What's more, by working with sustainable materials and environmentally responsible equipment, you ensure that your home continues to increase in value by keeping up with current trends and ecological concerns.

Ultimately, the biggest reason why a house extension is worthwhile is the transformation it brings to your daily life. A new, well-designed space can bring a significant quality of life, providing places for relaxation, work or leisure that improve the harmony of your home. It then becomes clear that a house extension is much more than just adding square metres... Let yourself be surprised by its advantages!