Greening a small garage roof can cost anywhere from €400 to several thousand euros. Among other things, the prices depend on whether extensive or intensive green roofs are to be installed. What that is, which one is better suited for the garage roof and what costs can arise, you can find out below.
Hardy Sedum species are mostly used for green roofs
Extensive versus intensive green roofs
In principle, there are two different types of green roofs. In the case of extensive green roofs, layers with a thickness of 6 to 20 cm are used, while in the case of intensive green roofs, layers of up to 40 cm are applied to the roof. This has two consequences: On the one hand, significantly taller plants (even small trees) can be planted with intensive roof greening, the roots of which reach deeper and therefore require more soil, on the other hand, this - and the size of the plants - results in a significantly higher weight and up to 1000 or more kilograms per square meter.
Since a garage roof is usually not designed for such a weight, you should rather use an extensive variant when greening the roof of your garage. These are also significantly cheaper.
How much does a garage green roof cost?
You can find several complete packages on the Internet that include all the material you need for your green roof, making it easy to build your own. The prices for such complete sets range from €40 to €69 per sqm. You can read the exact prices of various providers in this Hausjournal article on carport green roofs. In the following table, we assume an average price of €50 per square meter and use this average to calculate the costs for green roofs for garages of different sizes. The calculation of the area in square meters was rounded up, since you cannot buy half a square meter online, only complete ones.
| garage type | Dimensions (W x L) | Area in sqm | Green roof costs |
|---|---|---|---|
| Small single garage | 2.85 x 5.50m | 16 sqm | around €800 |
| Larger single garage | 2.85 x 6m | 18 sqm | around €900 |
| double garage | 5.72m x 6m | 35 sqm | around 1750€ |
| small attached garage | 2.85 x 2.50m | 8 sqm | around €400 |
tips
In this article you can read how to green your garage roof step by step.