Why choose Avenir Renovations?
Why enlarge a single-storey house?
Single-storey houses offer many advantages in terms of comfort, but their space is sometimes limited. The extension then becomes an obvious choice, both for comfort and for enhancing value.
Anticipate or respond to a life change
Adding a bedroom for a child, creating a home office for remote work, or adding an additional bathroom are all reasons to rethink the layout. A single-storey extension allows you to do this without level constraints, which is ideal for elderly people or those with reduced mobility.
Enjoy the fluidity of spaces
Expanding a single-storey house with an annex allows you to preserve continuity between spaces by creating wide openings to the new room. This avoids corridors, stairs, and makes circulation more natural and brighter.
Enhance your property value
A well-designed annex increases the living space, improves overall comfort, and increases the resale value of your home. It is a smart investment, especially if you optimize the orientation, openings, and energy performance of the project.
Our solutions for creating a single-storey extension
Avenir Rénovations offers several types of extensions for single-storey houses, according to your needs, your land, and your budget.
The technical and aesthetic advantages of a single-storey extension
The single-storey extension has four technical and aesthetic advantages: improved accessibility, modular fit-outs, harmonious integration with the existing building, and excellent thermal and energy performance.
A single-storey extension is naturally suited for people with reduced mobility. No steps, no stairs, no level differences: everything is smooth and secure.
Guest room, parental space, independent studio, office, or playroom: the extension can serve a multitude of functions, with a fully customizable layout.
Our partner architects ensure that the proportions, materials, and aesthetics of your house are respected. The result is coherent and enhancing.
The extension is designed according to Belgian PEB standards: top insulation, high-performance joinery, controlled ventilation. Comfort is guaranteed all year round.
What is the price of a single-storey extension in Belgium?
Prices depend on the materials used, the finishes chosen, and the constraints of the land (foundations, access, connections).
| Type of single-storey extension | Average price per m² including tax |
| Masonry extension with sloped roof | 1,500 to 2,200 € |
| Modern flat roof extension | 1,600 to 2,400 € |
| Single-storey wooden extension | 1,300 to 2,100 € |
A clear, free, and personalized quote is provided after a site visit.
Why choose Avenir Rénovations?
- Local agencies throughout Belgium
- Solutions tailored for single-storey houses
- Personalized support from A to Z
- Complete coordination of the work
- Handling of urban planning procedures
- Ten-year guarantee on completed work
FAQ: single-storey extensions and annexes
Is a single-storey extension always allowed?
Whether single-storey or not, in Belgium, any house extension is subject to approval from the local authorities. A planning permission request is generally required. Acceptance criteria vary by municipality, project size, height, distance from property boundaries, and exterior appearance. Single-storey annexes are generally well accepted as they maintain the building's volume and often respect the alignment of constructions. At Avenir Rénovations, we anticipate all these requirements from the design phase. We collaborate with partner architects who know the local rules and build a solid, compliant, and optimized file to obtain the permit as quickly as possible.
How to ensure good energy performance?
Our annexes are designed to meet Belgian energy performance standards (PEB). To achieve this, we use high-performance insulating materials for walls, floors, and roofs. We also integrate high thermal efficiency frames, a compliant ventilation system, and optimized natural lighting. The quality of execution is also crucial: we ensure careful installation, without thermal bridges, with perfect air and water tightness. At the end of the project, a PEB certificate can be issued by an independent expert. This way, you benefit from real thermal comfort, controlled energy bills, and a better score in case of a potential resale.
Can I stay in the house during construction work?
In most cases, yes. A single-storey annex is built outside the existing structure, which often allows you to continue living in the house during the work. However, a brief interruption may be necessary at the time of connection or opening between the two volumes. We plan this step in advance to make it as short and least disruptive as possible. The site is secure, disturbances are limited, and you are kept informed of progress. If special conditions require temporary relocation, we assist you in organizing this transition.
Expand your single-storey home effortlessly with Avenir Rénovations
Comfort, accessibility, enhancement… The single-storey home extension offers multiple benefits without complication. Trust Avenir Rénovations to transform your needs into a coherent, aesthetic, and perfectly executed project.
