Your family is growing or you need a home office? Home extension is often more economical and less stressful than moving. In Luxembourg, several options are available: lateral extension, elevation, conservatory, loft conversion…
Types of Extensions Available
Lateral Extension (Ground Floor)
Building a new room attached to your house. The most common solution.
Ideal for: adding a bedroom, office, living space. Typical area: 15-50m² Average price: €1,800-2,500/m²
Elevation (Adding a Floor)
Adding an extra level to your existing house.
Ideal for: doubling space without using garden. Typical area: entire house footprint Average price: €2,200-3,200/m²
Conservatory
Glazed extension, often between living room and garden.
Ideal for: gaining light, creating a winter garden. Typical area: 10-30m² Average price: €1,200-2,000/m²
Loft Conversion
Converting unused attic into living space.
Ideal for: bedrooms, office, playroom. Average price: €1,000-1,800/m²
Building Permit: When is it Required?
In Luxembourg, any modification to footprint or height requires planning permission.
Permit required:
- Solid extension (masonry, timber frame)
- Elevation
- Conservatory over 10m² (depending on commune)
- Facade modification
Prices by Extension Type (2026)
| Type | Price/m² | 25m² Extension |
|---|---|---|
| Masonry extension | €1,800-2,500 | €45,000-62,500 |
| Timber frame extension | €2,000-2,800 | €50,000-70,000 |
| Elevation | €2,200-3,200 | €55,000-80,000 |
| Standard aluminium conservatory | €1,200-1,800 | €30,000-45,000 |
| Loft conversion | €1,000-1,800 | €25,000-45,000 |
