DIN 276 and HOAI — cost groups in fee planning

Brief definition

HOAI governs fees for architectural and engineering services. DIN 276 structures construction costs into cost groups. In early design, both systems are used in parallel — cost groups support cost estimating; HOAI governs remuneration for planning services.

Practice

• Early phases: rough cost-group estimates from areas and building construction
• Detailed design: detailed BoQ quantities per cost group
• Alignment of fee band vs. actual planning effort remains separate

AIGO relevance

AIGO accelerates quantity take-off and norm-compliant data for cost groups 300/400/500 — as a reliable basis for cost estimating and tendering, not as a substitute for HOAI.