In Switzerland, construction projects follow a structured framework defined by the SIA 102/108 standard. These phases ensure a methodical progression from the first sketch to the final handover. Here are the stages where Rhône-Electra Engineering is involved as electrical engineering consultants, illustrated by the increasing level of project detail.
| Phase description | Level of project detail |
|---|---|
Phase 3.31 — Preliminary designThe project takes shape. The architect proposes a site layout, building form, materials and energy targets. A recognisable floor plan now emerges, with rooms clearly identified. The electrical engineer mainly produces energy sizing calculations and cost estimates at this stage Rough cost estimate: ± 15% |
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Phases 3.32 / 3.33 — Design development and building permitBuilding components are calculated and dimensioned. Scaled drawings show cross-sections, elevations and construction details. This is also the stage for the building permit application: compilation of the public enquiry dossier, liaison with public authorities and administrative follow-up. Rhône-Electra Engineering produces electrical layout drawings and supports clients through the building permit process. Detailed cost estimate: ± 10% |
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Phase 4.41 — TenderThe drawings are detailed enough to issue invitations to tender. Each trade receives precise specifications with quantities and requirements. Bids are compared and contracts awarded. For the electrical scope, tender documents take the form of CAN specifications (standardised item descriptions) detailing the planned equipment and installation methods Every socket, every light fitting is positioned. |
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Phase 5.51 — Execution planningExecution drawings integrate every contractor's details: cable routes, exact positions of electrical panels, schematic diagrams. Materials and equipment are finalised. The electrical engineer produces the final drawings, distribution board schematics and all the documentation required for execution This is the installation drawing — ready for the construction site. |
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Phase 5.52 — ConstructionThe construction site is in full swing. The engineer coordinates contractors, verifies that execution matches the drawings, and monitors costs and timelines. Our engineers are present on site to ensure every electrical installation matches the plans exactly. |
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Phase 5.53 — CommissioningThe building is finished. Every installation is checked, defects are remedied and works are formally accepted. The complete file is handed over to the building owner. The electrical engineer takes part in the formal acceptance inspections and produces the as-built documentation 2-year warranty period. The project is delivered. |
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Rhône-Electra Engineering supports its clients as electrical engineers from the preliminary design phase through to commissioning, with an on-site presence at every critical stage.
Illustrations: SIA, section Vaud — Construire avec des professionnels