Service Phases per HOAI 2021
HOAI Service Phases 1–9
Technical Equipment – System Groups 4, 5, 6, 8. All basic services transparently presented.
The 9 Service Phases
Our System Groups
Specialist planning of technical equipment per § 53 HOAI
AG 4
High-Voltage Systems
KG 440–450
- ●High, medium and low voltage systems
- ●Self-generation (emergency, UPS, PV)
- ●Low-voltage switchgear
- ●Low-voltage installations
- ●Lighting systems
- ●Lightning protection / earthing systems
AG 5
Telecommunications & IT Systems
KG 450–460
- ●Telecommunications systems
- ●Search and signal systems (call systems)
- ●Time service systems
- ●Electroacoustic systems (PA/VAS)
- ●TV and multimedia systems
- ●Hazard detection systems (FAS, IDS)
AG 6
Conveying Systems
KG 460
- ●Elevator systems
- ●Escalators and moving walks
- ●Inspection platforms
- ●Transport systems
- ●Crane systems
AG 8
Building & System Automation
KG 480
- ●Automation devices (DDC)
- ●Control/regulation cabinets
- ●Management/operating devices (BMS)
- ●Room automation (KNX/DALI)
- ●Building management system (BACnet)
Fees per HOAI 2021
Since the 2021 amendment, the HOAI serves as an orientation framework. The minimum and maximum rates are no longer binding, but still form the basis for fair and transparent fee agreements.