What does a green roof cost per m² in Belgium in 2026?
Last updated: April 2026
A green roof, also known as a living roof or sedum roof, is a sustainable solution that is increasingly popular among homeowners and local authorities alike. Beyond its aesthetic appeal, a green roof delivers tangible benefits: it improves water management by retaining rainwater, reduces the urban heat island effect, extends the lifespan of the waterproofing system, and supports local biodiversity. In many Dutch cities, municipalities actively subsidize their installation.
The cost of installing a green roof ranges from €42 to €95 per m², depending on the system chosen and the condition of the roof structure. Simple sedum cassette systems for extensive green roofs are the most affordable option, while intensive systems with deeper substrate layers and larger planting varieties are significantly more expensive. A crucial consideration is whether the existing roof structure can carry the additional weight of substrate and plants, which sometimes requires structural reinforcement.
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This is an estimate based on average 2026 prices. Actual costs may vary. Always request multiple quotes for an exact price.
Cost factors
The total cost usually consists of:
- Substrate and planting: 35-45% of the total
- Drainage layer and root barrier: 20-30% of the total
- Installation labor: 25-35% of the total
- Structural inspection and preparation: 5-15% of the total
These percentages can vary depending on the type of green roof (extensive or intensive) and the condition of the existing roof structure.
Why do prices vary?
- Type of green roof: An extensive sedum roof (€45-€65/m²) is lighter and cheaper than an intensive system with deeper substrate and more planting choices (€70-€100/m²).
- Load-bearing capacity of the roof: An intensive green roof weighs 150-400 kg/m² when wet, while an extensive system weighs 60-150 kg/m². If the existing structure needs reinforcement, costs can increase significantly.
- Roof surface and accessibility: Larger surfaces are relatively cheaper due to economies of scale. Difficult-to-access roofs increase labor costs due to the use of cranes or special equipment.
- DIY versus professional installation: Sedum cassettes can in principle be installed yourself on flat roofs, saving 25-35% in labor costs. For sloped roofs or intensive systems, a professional roofer is required.
Subsidies & incentives
Green roofs qualify for municipal subsidies in many Dutch cities. Schemes vary by municipality, but subsidies can cover a significant portion of installation costs.
Municipal Subsidies
Most major municipalities offer a contribution per m² of installed green roof:
- Average subsidy amount: €15-€40 per m² (locally determined)
- Coverage: Typically 20-50% of total installation costs
- Minimum surface: Generally 6-10 m² depending on the municipality
Examples of Municipal Schemes
Examples of cities with active green roof subsidy programs:
- Amsterdam: Subsidy via the Climate-Resilient Amsterdam programme
- Rotterdam: Scheme via the Rotterdam Rooftop Programme
- Utrecht, The Hague and other cities: Check the municipal subsidy portal for current schemes
Calculation Example
- Green roof 40 m² at €60/m² installation cost = €2,400 totalMunicipal subsidy at €30/m²: 40 m² × €30 = €1,200 subsidyNet investment after subsidy: €1,200
Application Process
Keep the following steps in mind:
- Apply for the subsidy before installation begins (often mandatory)
- Keep invoices and photos for accountability purposes
- Check whether the company installing the green roof is recognized by your municipality
Regional price differences
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