Ordnung SIA 112 (2001) – Swiss Service Model for Planning and Construction
The Ordnung SIA 112, also designated as Schweizer Norm SN 508 112, is a regulatory framework published by the Schweizerischer Ingenieur- und Architektenverein (Swiss Society of Engineers and Architects). Released in June 2001, this document establishes a standardized service model (Leistungsmodell) for construction processes in Switzerland. It replaces the 1996 version and serves as the primary structural reference for coordinating interdisciplinary planning teams and owner-contractor relationships throughout the lifecycle of a built asset.
The scope of the document encompasses new construction, renovations, maintenance, and reuse projects across building construction, civil engineering, plant construction, and landscape architecture. It defines six distinct phases and twelve sub-phases, beginning with strategic planning and extending through to facility management. The model integrates with specialized service and fee regulations such as SIA 102, 103, 104, 108, and 110, providing a common vocabulary for service areas (Leistungsbereiche), modules (Module), and sub-phase objectives (Teilphasenziele).
The document provides detailed tables for each project phase, identifying expected outcomes, necessary decisions from the property owner, and potential service modules for the planning team. It also includes the Allgemeine Vertragsbedingungen (AVB), which govern the legal and contractual obligations between the parties involved in the planning and execution process.
Project Phases and Sub-Phases
The service model categorizes the lifecycle of a building into six phases, each containing specific sub-phases to manage planning progress and decision-making.
- Phase 1: Strategic Planning: Includes sub-phase 11 (Bedürfnisformulierung, Lösungsstrategien) focused on defining needs and solution strategies.
- Phase 2: Preliminary Studies: Comprises sub-phase 21 (Projektdefinition, Machbarkeitsstudie) and sub-phase 22 (Auswahlverfahren) for feasibility and selection processes.
- Phase 3: Project Design: Divided into sub-phase 31 (Vorprojekt), 32 (Bauprojekt), and 33 (Bewilligungsverfahren / Auflageprojekt) for permitting.
- Phase 4: Tendering: Focused on sub-phase 41 (Ausschreibung, Offertvergleich, Vergabeantrag) to reach awarding readiness.
- Phase 5: Realization: Covers sub-phase 51 (Ausführungsprojekt), 52 (Ausführung), and 53 (Inbetriebnahme, Abschluss) for commissioning.
- Phase 6: Facility Management: Addresses sub-phase 61 (Betrieb) and 62 (Erhaltung) for operation and maintenance.
Overall Management and Project Organization
The document defines the role of the Gesamtleiter (Project Lead), who is responsible for the professional and administrative management of the planning team. The legal structure of this role is typically organized through two primary variants.
- Planervertrag (Contract SIA 1012/1): A contract between the owner and a planning collective where one member acts as the Gesamtleiter.
- Einzelplanervertrag (Contract SIA 1012/3): A contract between the owner and a lead professional who then hires sub-planners via Subplanervertrag (Contract SIA 1012/4).
The Gesamtleiter is typically an architect for building projects and an engineer for other types of construction. Responsibilities include communication with the owner, setting up the project organization, ensuring quality assurance, and coordinating the information flow and documentation between all participants.
General Contractual Conditions (AVB)
The Allgemeine Vertragsbedingungen (AVB) included in the document define the rights and obligations of the parties. Key legal provisions include:
- Duty of Care: The professional must protect the owner's interests and achieve defined goals according to recognized technical rules.
- Liability: The professional is liable for damages resulting from faulty performance, including lack of coordination or failure to meet deadlines (Article 9.1).
- Statute of Limitations: General claims expire after ten years (Article 11.1). Claims regarding defects in the building expire five years after acceptance of the work (Article 11.21).
- Payment Terms: Invoices are generally due within thirty days of receipt (Article 5.1).
Frequently Asked Questions
What is the primary purpose of the SIA 112 service model?
It provides a standardized structure for the planning and realization of construction projects, defining phases, sub-phases, and the distribution of responsibilities between owners and planners.
How many project phases are defined in SIA 112?
The document defines six phases: Strategic Planning, Preliminary Studies, Project Design, Tendering, Realization, and Facility Management.
Who is responsible for commissioning in Phase 5?
In sub-phase 53 (Inbetriebnahme, Abschluss), the planning team and Gesamtleiter organize the handover of the building to the owner and the training of operating personnel.
What is the warranty period for building defects under SIA 112?
According to Article 11.21 of the AVB, claims for defects in the building expire five years after the acceptance of the work or the respective part of the work.
What is sub-phase 33 focused on?
Sub-phase 33, Bewilligungsverfahren / Auflageprojekt, focuses on obtaining the building permit and verifying costs and schedules to approve the construction credit.
Can the SIA 112 model be used for infrastructure projects?
Yes, it is explicitly designed for use in building construction (Hochbau), civil engineering (Tiefbau), and landscape architecture (Freianlagen).
