Solar Energy vs. Historic Preservation: A Conflict of Interests
Photovoltaics on listed buildings is a topic of increasing relevance. On the one hand, climate goals and rising energy prices demand the expansion of renewable energies. On the other hand, heritage law protects the historical appearance of buildings. For solar installers and homeowners, this means: a lot is possible – but not everything, and not without approval.
Legal Basis
Historic preservation is a matter for the individual federal states. The heritage protection laws of the federal states regulate which changes to protected buildings are permissible. Since the amendment of the Building Energy Act (GEG) and various state building regulations, PV on monuments is increasingly being facilitated – however, an approval requirement still exists.
- PV systems on monuments require heritage approval
- The lower heritage authority is responsible
- Approval chances depend on the location and visibility
- Removable installations are often preferred for approval
What Increases Approval Chances
Location Selection
Systems on the roof side facing away from the street have better chances than those on the visible side. Flat roofs behind parapets or inner courtyard roofs are also often less problematic.
Inconspicuous Technology
Modules in roof tile colors, in-roof systems, and minimally invasive fastening techniques improve approval prospects. Every visible technical element is critically evaluated by the authority.
Removability
Installations that can be removed without permanent alteration of the building fabric are preferred by heritage authorities. This also applies to cable routing and roof penetrations.
Roof Penetrations in Monuments
Cable penetration through the roof is a particularly sensitive point for monuments. Drilled tiles or large-scale changes to the roof skin are often not approvable. Minimally invasive solutions that do not disturb the historical roof appearance are required.
NEXCAPE roof penetrations made of TPU offer advantages here: they only replace a single tile, do not require drilling or cutting, and can be completely removed when the system is dismantled. The flexible TPU material conforms to historical tile profiles without changing the roof structure.
Recommendation for Solar Installers
For listed buildings, early coordination with the authority is recommended – ideally before the offer phase. A well-thought-out concept with inconspicuous technology and removable installation significantly increases the chances of approval.
NEXCAPE penetrations in variants for 2, 4, and 6 PV cables (optionally with PE) adapt to historical tile shapes due to their flexibility. Manufactured with 3D printing in Germany, UV-resistant, and installable without tools.
Discover minimally invasive roof penetrations: to the TPU roof penetrations for solar cables
