House extension prices in Belgium

The average costs of a home extension based on area in Belgium

The cost of a home extension in Belgium varies significantly depending on the added surface area. For a 20 m² extension, budget between 20,000 and 40,000 euros. A 30 m² extension generally ranges between 30,000 and 60,000 euros, while a 50 m² project can reach 50,000 to 100,000 euros in Belgium. These ranges most often include:

• the framework,
• the insulation of the created volume,
• the interior walls,
• standard finishes.

The rate per square meter ranges between 1,000 and 2,000 euros depending on the complexity of the project and the quality of the materials used in Belgium. These amounts serve as a basis for evaluation, as several parameters can affect the final cost of your extension in Belgium.

Home extension budget based on project type in Belgium

The type of extension you choose greatly influences the overall cost. Each configuration has specific advantages and variable rates depending on your needs and the technical constraints of the site in Belgium.

Price of a veranda in Belgium

The veranda remains one of the most affordable home extension solutions in Belgium. For a classic structure of 20 m², expect to pay between 15,000 and 35,000 euros.
Aluminum models start around 800 euros/m², while wooden versions reach 1,200 euros/m².

Premium verandas, equipped with insulated roofing and reinforced glazing, can exceed 1,500 euros/m² in Belgium. This extension offers excellent value for quickly expanding your living space.
Installation generally involves a concrete slab and various electrical connections, elements to be included in your overall budget in Belgium.

Cost of an attached garage in Belgium

An attached garage represents an investment ranging from 8,000 to 25,000 euros, depending on the area and desired features.
For a simple 20 m² garage, budget between 400 and 800 euros/m².
Versions equipped with a motorized door, complete insulation, and quality finishes reach 1,000 euros/m² in Belgium.

Adding an additional level to create storage space increases the cost by 30 to 50 %.
This type of extension significantly enhances your property value in Belgium while protecting your vehicles. The project requires electrical connections, a ventilation system, and suitable foundations, elements to be included in your estimate.

Cost assessment based on project difficulty in Belgium

The technical complexity of your extension in Belgium directly influences the final budget. Any intervention on the existing structure or any significant architectural modification incurs additional expenses that can be substantial for the Belgian site.

Simple extension without structural intervention

When it is attached to the house without touching the load-bearing structure, a simple extension is the most economical option in Belgium. Expect to pay between 1,000 and 1,400 euros/m² for this type of project.
This method mainly involves opening the existing wall and building the new adjoining part.

The foundations remain separate from those of the original building, which significantly simplifies the progress of work in Belgium. This solution is perfect for expanding a kitchen, creating an additional bedroom, or setting up a workspace.
Completion times are generally short, limiting disturbances and additional costs to the Belgian project.

Extension including a roof modification

Modifying the roof to harmoniously integrate your new extension increases the budget by 20 to 40 % in Belgium. For these more complex projects, budget between 1,400 and 2,000 euros/m².

This type of intervention requires the expertise of specialized professionals and a detailed technical study.
Partial removal of the covering, adjustment of the framework, and creation of watertight connections represent the main challenges of the project in Belgium.

Even though the cost is higher, this solution provides optimal architectural integration and better valuation of your property.
During the work, enhanced protection against rain and Belgian weather conditions is essential.

The administrative formalities and their influence on project costs in Belgium

The administrative procedures represent a significant item in the budget of a home extension in Belgium. A prior declaration incurs costs of around 150 euros for the file, while a building permit, required for extensions exceeding 20 m², involves costs that can reach 760 euros in Belgium.
The involvement of an architect becomes necessary if the total area of your home exceeds 150 m² after extension, adding 8 to 12 % to the overall project cost.

Soil analyses, sometimes required depending on the nature of the Belgian terrain, represent an additional cost ranging from 1,000 to 2,500 euros.
Some municipalities in Belgium also impose specific aesthetic or technical rules, which can increase the price of materials and the complexity of implementing the project.

Why choose our general company to carry out your extension in Belgium?

The choice of building specialist is crucial for the success of your home extension project in Belgium. At Avenir Rénovations, we make this step a simple process through a comprehensive formula: design, execution, and coordination fully integrated.
No more multiple intermediaries and repeated delays! Our unified team ensures smooth organization and optimized rates thanks to our direct partnerships with Belgian material suppliers.

Unlike some architects who delegate the execution, our renovation company in Belgium masters every phase of the project to guarantee impeccable quality.

This centralized management limits errors, eliminates defects, and strictly adheres to your deadlines and initial budget in Belgium.

Guarantees and support after the completion of your extension in Belgium

At Avenir Rénovations, we stand out in Belgium with an exemplary quality commitment designed to fully protect your investment.
Our ten-year guarantee covers all issues that may affect the solidity of your extension or prevent its normal use. You are thus perfectly secured, with no unpleasant surprises, anywhere in Belgium.
In case of any anomalies detected after the project, our response is immediate, complete, and transparent.

The guarantee of perfect completion, valid for one year, ensures the correction of any minor defects related to the finishes of your extension in Belgium.
Unlike other companies that multiply costly maintenance contracts, we focus on impeccable execution from the start. This approach holds our team accountable and ensures the durability of every project completed in Belgium, while avoiding additional costs for you.

With Avenir Rénovations in Belgium, you benefit from absolute peace of mind and a stress-free home extension, with no surprises and no hidden expenses.

Tips for mastering your extension budget in Belgium

Our renovation company transforms your budget into a true lever of success thanks to in-depth expertise in Belgium.
Your Project Manager analyzes your home extension project for free to identify the most advantageous solutions:

• optimized shapes,
• high-performance materials offering the best value for money,
• strategic organization of the site.

Our precise knowledge of the Belgian market allows us to guide you towards the most favorable periods and anticipate unforeseen expenses.
Thanks to our exclusive partnerships with suppliers in Belgium, you benefit from negotiated rates that are completely inaccessible to individuals.

At Avenir Rénovations, we also offer modular options that allow you to adapt your investment to your financial capabilities.
Our clear and detailed quote guarantees no surprises and complete visibility on your project in Belgium.

With Avenir Rénovations, optimizing your budget becomes simple and obvious. We maximize every euro invested to bring to life the home extension you envision in Belgium.