Short answer
What you need to know first.
Before a flat-roof PV quote in Basel-Landschaft, owners should first clarify roof fabric, structural reserve, fall protection, fire safety, electrical and grid interfaces, and the cantonal notification or permit route. Only then can it be judged sensibly how densely the roof can be covered, which mounting system fits and whether the system can later be operated safely, maintainably and with proper documentation.
Important
This page is general information for flat-roof PV in Canton Basel-Landschaft and does not replace property-specific review by a structural engineer, roof planner, electrical specialist, municipality, grid operator, fire-safety office, insurer or funding body. Older roof membranes, skylights, protected status, lightning-protection systems, batteries, commercial loads or large connection capacities in particular require current requirements to be checked directly for the property.
Decision points
What determines the right path.
The first decision is roof condition. A PV system remains on the building far longer than many temporary roof repairs. If waterproofing, insulation, edge details, skylights or drainage need renovation in the next few years anyway, this question belongs before module layout. Otherwise a technically good system may later have to be removed at high cost simply because the roof was not assessed first.
The second decision is structure and loads. Flat-roof systems combine dead weight, ballast, wind loads, snow loads and maintenance loads. Swissolar refers to SIA 261 for structural requirements with wind and snow loads relevant in Switzerland. For owners this means: a layout sketch without load and roof-edge assessment is not a robust planning basis.
The third decision is occupational safety. Suva states that fall protection is mandatory for installing and maintaining solar systems and should already be planned during surveying and work preparation. On flat roofs this concerns roof edges, skylights, safe access, traffic routes and whether collective protection such as railings or side protection is possible.
The fourth decision concerns fire safety and cable routes. Swissolar names fire-safety requirements such as fire compartments, escape routes, locations of electrical equipment and accessibility as planning topics. Especially on commercial roofs, DC cables, inverter location, disconnection options, labelling and maintenance access must be planned so later inspection and emergency services are not faced with an unclear system.
The fifth decision is electrical responsibility. ESTI and Swissolar state that electrical installation work on PV systems requires authorisation and that tests, protocols and the safety certificate become relevant before handover. Clean flat-roof planning therefore does not artificially separate mounting, DC/AC work, measurement and test protocol, safety certificate and grid-operator documents.
The sixth decision is the Basel-Landschaft procedural route. Canton Basel-Landschaft describes notification instead of a building permit for many solar and photovoltaic systems in building and agricultural zones; exceptions include core, townscape-protection or heritage-protection zones and cultural or natural monuments of cantonal or national importance. For larger commercial roofs, this step must align with grid connection, schedule and documentation.
Sequence
How the project stays cleanly managed.
- 1
Carry out the roof surveyrecord waterproofing, insulation, slope, drainage, skylights, penetrations, edge distances, existing rooftop equipment, lightning protection and safe access. For older or commercially used buildings, the pre-check should also include non-walkable surfaces and possible hazardous materials.
- 2
Clarify structure and system variantcheck whether a ballasted, low-penetration or property-specific fixed system is possible and which load reserves exist. Only with this basis can row spacing, maintenance routes, roof-edge zones and technically sensible coverage density be defined.
- 3
Plan the safety and maintenance conceptdefine fall protection, access, skylight protection, traffic routes and later cleaning or maintenance before installation. Suva recommends including these measures from the start in surveying and work preparation; on flat roofs this is not a later accessory.
- 4
Bring electrical and fire-safety interfaces togethercoordinate cable routes, inverter location, equipotential bonding, surge protection, fire-safety requirements, labelling and disconnection options with the electrical specialist. It must be clear who holds which installation authorisation and which protocols will be available at handover.
- 5
Run the Basel-Landschaft procedure and grid connection in parallel: do not process municipality, zone, protected status, notification form or building application, responsible grid operator, connection request, metering concept and self-consumption one after another. For commercial properties, load profile, feed-in, storage, ZEV/vZEV or later expansions already affect the first quote.
- 6
Document handoverafter installation and commissioning, system layout, datasheets, photos, maintenance access, measurement and test protocol, safety certificate, grid-operator approval, monitoring access and responsibilities belong in an organised dossier. For property managers and commercial clients, this documentation is the basis for operation, insurance, inspection and later extensions.
Checklist
Questions to settle before the quote.
- Check roof membrane, remaining roof life and structure before module layout
- Plan fall protection, safe access and maintenance routes together
- Coordinate fire safety, cable routes, inverter location and electrical testing
- Do not separate the Basel-Landschaft notification or permit route from grid connection
FAQ
Common questions on this topic.
Sources
Official sources & references.
The responsible authorities are decisive. Always verify binding details – amounts, deadlines and conditions – for your specific property against the current status of the respective authority.