Green Roofs and Facades – Untapped Potential for Climate Adaptation
Cities need more greenery to address the consequences of climate change – yet open spaces are scarce. Green roofs and facades open up additional vegetation spaces, improve the microclimate and are an important building block for climate adaptation in urban areas as well as in smaller municipalities. For gardening and landscaping companies and landscape architects alike, this opens up a future-proof market segment that requires specialised knowledge and implementation expertise. Our trade fair in September 2026 will once again offer a hands-on forum for exchange. You can find more information on the GREEN – BLUE PATH topic area on our website. This article provides the key basic knowledge on green roofs and facades, which also offers exciting perspectives for municipalities.
Where Parks Reach Their Limits, Green Buildings Take Over
New space for green areas seems scarce in many places. Yet it is worth looking up – at roofs and facades. There is a great deal of untapped potential here. For context: in many cities, green roofs already cover around ten percent of suitable roof surfaces, taking the 2023 Monitoring Report on the German Strategy for Adaptation to Climate Change on the website of the German Environment Agency as a benchmark. Germany is said to be a world leader in new greening projects, as Dr Gunter Mann, President of the German Association of Building Greening (BuGG), explains. In 2024, around nine million square metres of roof area were newly greened in Germany, as documented in the BuGG Building Greenery Market Report 2025 (available in German only) on the association’s website. New facade greening projects, by contrast, account for only about 1.5 percent of this figure, according to BuGG, and the share in existing buildings is likely to be even lower. It is always worth remembering: this is not an either-or decision – green roofs and facades can easily be combined and even reinforce each other’s positive effects.
The Key Question: Green Roof or Photovoltaic System?
The assumption that green roofs compete with photovoltaic systems is now considered outdated. Extensive greening and PV systems work very well together when the modules are mounted on frames. The vegetation provides evaporative cooling and thereby increases panel efficiency, while the PV system offers additional shading – a highly effective combination with both ecological and energy performance benefits. This assessment is shared by the Environment Department of the City of Nuremberg, which provides an information sheet on combining green roofs and photovoltaics as a PDF. Even without solar panels, green roofs reduce heat, store rainwater, reduce pressure on the sewer system, protect the roof waterproofing and strengthen urban greenery.
The assumption that green roofs compete with photovoltaic systems is now considered outdated. Extensive greening can be excellently combined with PV when modules are mounted on stands. The vegetation provides evaporative cooling and thereby increases panel efficiency, while the PV system provides additional shading – a powerful overall system with ecological and energy-related benefits. This view is supported by research from the Fraunhofer Institute for Solar Energy Systems ISE. Further details can be found in the “Green-Roof Photovoltaics” project description on the ISE website. Even without solar panels, green roofs reduce heat, store rainwater, reduce pressure on the sewer system, protect the roof waterproofing and strengthen urban greenery.
Types of Green Roofs
A distinction is made between two main types:
- Extensive greening – lightweight, shallow, low-maintenance, ideal for retrofitting
- Intensive greening – taller build-ups, more diverse plants, greater weight, ideal for new builds and renovation
Demand is growing – and in many places, funding programmes additionally support implementation. This also applies to facade greening, which, despite growing attention, still occupies something of a niche.
Facade Greening: Vast Untapped Surface Potential
More and more municipalities are integrating facade greening into heat action plans, promoting greening measures and embedding vertical greening in sustainable urban planning. Modern systems – ground-based, container-based or wall-mounted – make implementation safe and predictable. Accordingly, demand for expert planning and maintenance is growing – a real opportunity for landscape planners and gardening and landscaping contractors. For green roofs and facades to function reliably in heat, heavy rainfall and dry periods, specialist expertise is required.
The following skills are expected:
- structural assessment of roofs and facades
- climate-resilient plants and suitable substrates
- functioning drainage and irrigation systems
- consulting, documentation and knowledge of standards
- long-term maintenance and development concepts
- consulting on the integration of PV systems
Maintenance in particular is developing into a stable, recurring line of business – from inspection rounds to irrigation and replanting.
Conclusion: A Market with a Future – and Opportunities for Landscaping Businesses
Green roofs and facades are central building blocks of climate adaptation and sustainable urban planning. They open up environmentally and economically attractive prospects for the gardening and landscaping sector. Businesses that qualify now and are familiar with funding opportunities will become sought-after partners for municipalities, planners and the housing industry.
