Service phases under the HOAI
From the first idea to support after completion: the German HOAI fee code divides planning services into nine phases. We guide you through all of them — as architects and as specialist planners.
Placeholder content: the final texts for this page are still to come. Structure, percentages and the calculator are already final.
Basic evaluation
Clarify the brief, advise on the overall scope, prepare the basis for decisions.
- G
- 2 %
- TW
- 3 %
- TA
- 2 %
Preliminary design
Develop the planning concept, align objectives, produce a first cost estimate.
- G
- 7 %
- TW
- 10 %
- TA
- 9 %
Design development
Work the concept up into a complete design — with a reliable cost calculation.
- G
- 15 %
- TW
- 15 %
- TA
- 17 %
Approval planning
Prepare and submit the documents for all required permits.
- G
- 3 %
- TW
- 30 %
- TA
- 2 %
Execution planning
Develop the design into a build-ready solution with all detailed specifications.
- G
- 25 %
- TW
- 40 %
- TA
- 22 %
Preparation of contract award
Draw up service specifications, determine quantities, compile tender documents.
- G
- 10 %
- TW
- 2 %
- TA
- 7 %
Assistance with contract award
Obtain, examine and evaluate tenders — through to the award with a cost quotation.
- G
- 4 %
- TW
- —
- TA
- 5 %
Site supervision
Supervise execution, control costs, support acceptance and documentation.
- G
- 32 %
- TW
- —
- TA
- 35 %
Post-completion support
Site inspections to identify defects before the limitation periods expire.
- G
- 2 %
- TW
- —
- TA
- 1 %
Fee shares per service profile: G = buildings and interiors (sec. 34 HOAI), TW = structural design (sec. 51, phases 1–6 only), TA = technical equipment (sec. 55).