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Engineering services according to HOAI

Nine service phases. One point of contact.

The picture shows four employees of Zentrale Technik standing around a 3D model and discussing engineering services in accordance with HOAI © Filip Warchalowski/STRABAG

Engineering services from A to ZT!

Zentrale Technik (ZT) offers comprehensive engineering services in accordance with the German Fee Structure for Architects and Engineers (HOAI), accompanying you through all phases of your construction project - from the initial concept to final completion.

With its expertise in service phases 1-9, Zentrale Technik ensures efficient and successful design, execution and supervision.

All HOAI service phases from a single source

  • Preliminary Study
    The picture shows two employees of the Zentrale Technik smiling as they look at a laptop and talk about the HOAI service phases. © Daniel Wanders/STRABAG

    The foundation for your construction project

    In service phase 1, we assess the project’s framework conditions, identify the client’s needs and analyse the initial project requirements.

    Our aim is to gather all relevant information in order to make an informed decision about the next design steps.
  • Preliminary planning
    The picture shows five employees from the central technology department exchanging ideas as part of service phases 1-9. © Daniel Wanders/STRABAG

    A well thought-out planning concept

    The aim of service phase 2 is to develop the initial designs and concept ideas and to check their feasibility.

    We develop various solutions to meet the client's tasks and requirements.
  • Design planning
    An employee from the central technology department stands in front of a large screen with a plan of the service phases. © Filip Warchalowski/STRABAG

    From vision to precision

    From the initial preliminary planning to the detailed planning of architecture, structure and technology.

    In service phase 3, we concretize the entire planning, create detailed drafts and determine the final design.
  • Approval planning
    The picture shows three employees from Central Technology sitting in front of a laptop and discussing a service phase. © Daniel Wanders/STRABAG

    The step to planning permission

    In service phase 4, we prepare all the necessary documents and evidence for submission to the building authorities in order to obtain approval for the construction project.

    Thanks to our networking both within and outside the Group, we ensure a seamless basis.
  • Implementation planning
    The picture shows two employees from Central Technology talking to each other. © Filip Warchalowski/STRABAG

    Precise planning, strong execution

    In service phase 5, we take care of a comprehensive presentation of the structural implementation and execution.

    We develop technical details, create detailed plans and drawings and specify materials and techniques for the construction work.
  • Preparation of the award
    The picture shows an employee of the central technology department pointing at a large screen. © Daniel Wanders/STRABAG

    Setting the right course

    We make the selection process effective and transparent with detailed and careful preparation of the contract award.

    Our aim in service phase 6: to ensure economic success, cooperation based on partnership and smooth project progress right from the start.
  • Involvement of the awarding
    The picture shows two employees from Central Technology shaking hands and smiling. © Daniel Wanders/STRABAG

    At your side with help and advice

    Are you looking for suitable partners and expertise for your construction project? We actively support you in your search!

    In service phase 7 , we help with the tender review, conduct negotiations and ensure that all contractual and legal requirements are taken into account in the contracts.
  • Object monitoring
    The picture shows two employees from Central Technology in safety clothing on a construction site. © Daniel Wanders/STRABAG

    Strong together - we lend a hand

    After all, the best planning is useless if the implementation on the construction site does not work.

    In service phase 8, we ensure that the construction project is implemented professionally on the construction site and bring together the various contacts and trades in an integrated manner.
  • Property management
    The picture shows two employees from Central Technology in front of a green façade. © Daniel Wanders/STRABAG

    Everything under control - even after handover

    Whether maintenance, servicing or warranty support - in service phase 9, the final phase of our engineering services in accordance with HOAI, we also look after your building after completion.

    Benefit from our experience and let us look after your building efficiently and sustainably.

Engineering services according to HOAI: Your advantages

Your construction project will be a success with us! Rely on engineering services that deliver more. With our expertise in service phases 1-9, we are at your side from A to ZT.

  • Complete support: All HOAI service phases from a single source
  • Experience & expertise: you have over 1,300 experts at your side
  • Individual solutions: Customized planning according to your requirements
  • Maximum planning security: clear processes and seamless project coordination
  • Safety: We are part of STRABAG and ZÜBLIN
  • A portrait of Niels Dürr, Member of the Board of Management at Central Technology.

    We in Central Engineering think about construction projects across all service phases - with foresight and engineering expertise you can rely on. As part of STRABAG and ZÜBLIN, we create solutions that last.

    Niels Dürr
    Head of Central Technology

Engineering services according to HOAI - FAQ

  • What is the HOAI?

    The HOAI (Fee Structure for Architects and Engineers) defines how planning and monitoring services are structured and assessed. It defines the so-called service phases, which are the smallest assessed units. Each phase contains the basic services that are required for the proper fulfillment of a contract.

    In addition, there are special services that are named in the HOAI but are not assessed via the fee tables. The fee for these is agreed individually.

    Since the 2021 reform, freedom of contract applies: the HOAI table values serve as a guide but are no longer binding. However, the HOAI remains a recognized set of rules for describing and structuring planning services.

  • What are the HOAI service phases?

    The HOAI divides project management in property planning into nine service phases. Each phase has a clearly defined area of responsibility:

    Service phase 1: Basic evaluation
    Service phase 2: Preliminary planning
    Service phase 3: Design planning
    Service phase 4: Approval planning
    Service phase 5: Implementation planning
    Service phase 6: Preparation for awarding
    Service phase 7: Participation in awarding
    Service phase 8: Project supervision
    Service phase 9: Project support

    This structure ensures transparency and a clear distribution of tasks. Important: The percentage weighting of the phases depends on the service profile. Depending on the scope of services, not only the percentage shares differ, but in some cases also the content and number of service phases. All nine phases are relevant for project planning, while fewer service phases are provided for structural planning and these are weighted differently.

    Are you planning a construction project and need professional support?
    Contact us for engineering services in accordance with HOAI - we will reliably guide you through all service phases 1-9.

  • How are fees calculated according to HOAI?

    The fees are based on the chargeable costs of the project and the service phases provided. Each phase contributes a certain percentage to the total fee. These percentages vary depending on the service profile, for example between building planning and technical equipment.

    Basic services are assessed via the service phases. Special services are agreed in addition. Since 2021, fees can be freely negotiated - the HOAI tables serve as a mathematical and content-related guide for determining fees.

You have a goal. We have the plan.

Whether it's a vision, project idea or concrete construction project - we get your goals off the ground with engineering expertise and clear planning. Together, we design well thought-out solutions that last.

Find out more about central technology