Lacking space without wanting to move: this is a common dilemma for families in Nantes, because between the price of land and attachment to their neighborhood, expanding often makes more sense than leaving.
One question remains: raise the roof, extend it to the ground, or add a veranda? Each solution addresses different constraints, and the right choice always depends on your land, your budget, and the existing structure.
In France, more than half of all homes are detached houses, according to INSEE: that's a lot of property that could be extended rather than sold. Let's take a closer look at this.
1. Ground floor extension: the most common solution
Horizontal extensions remain the most requested in France: they represent approximately 68% of projects, compared to 32% for vertical extensions.
Its popularity is due to its technical simplicity and controlled cost, and it is perfectly suited to single-storey houses with a fairly large garden.
The downside: it reduces the outdoor area and requires available land, which is not always the case in dense downtown areas.
2. Adding a story: gaining space without altering the garden
When the plot is small, adding a floor becomes a sensible option. Extending the building preserves the land and creates real added value, particularly appreciated in a sought-after urban area like Nantes.
One tax advantage worth noting is that the exemption from capital gains tax on the sale of a right to build upwards remains extended until the end of 2026.
Also expect a longer construction period, generally from three to eight months depending on the complexity.
3. The veranda: light and transitional space
More accessible, the veranda brings light and comfort without major construction work.
It is appealing for creating a sun-drenched dining area or a winter garden, and it is also an ideal intermediate option when you want to modestly extend your living space while enhancing its value.
However, pay close attention to its insulation, which is crucial for enjoying it all year round and not just during the warmer months.
In terms of budget, expect to pay between €1,500 and €2,000 per m² for an entry-level aluminium model, and up to €3,000 to €4,000 per m² for a high-end sliding glass extension.
4. Make the right choice with a professional
The land, the budget and the procedures matter, and the Local Urban Development Plan of Nantes Métropole imposes precise rules on height and footprint, and any extension exceeding 20 m² requires a declaration or a permit.
Hence the importance of surrounding oneself with a specialist capable of assessing the feasibility before embarking on the project.
A well-thought-out extension can increase the value of a home by 10 to 20%, provided, however, that architectural coherence and quality of execution are carefully considered.
This is precisely where an experienced builder brings their full value: they analyze the terrain, anticipate constraints and ensure a durable result.
Nantes homeowners wishing to secure their project can consult a recognized local player, such as https://www.maisons-drean.fr/ , and move forward more serenely at each stage of the project, from the initial diagnosis to delivery.
Raise the roof, extend the ceiling, or add glazing: the answer depends on you!
Take your time to compare several quotes and visit recent projects before making your final decision, but in any case, professional support transforms a simple desire for space into a controlled and rewarding project!
