BNK/BNG Auditor: Expert Construction Supervision for Sustainable Residential Buildings

A BNK/BNG auditor is a specialized expert in sustainable construction who has been trained and certified by Bau-Info-Recycling-Netzwerk GmbH (BiRN). As a neutral or project-based specialist, the auditor oversees the entire certification process from the initial planning phase through to the final completion of a residential building.

Since successful certification under the Sustainable Small-Scale Residential Construction Rating System (BNK) or the Sustainable Buildings Rating System (BNG)—which are the key prerequisites for the government-issued QNG seal (Quality Seal for Sustainable Buildings) and the coveted KfW funding, the auditor plays a key role in the modern construction process.

What are the responsibilities of a BNK/BNG auditor?

The auditor provides comprehensive support to building owners, architects, and planners. Key responsibilities include:

• Goal Definition and Consulting: Defining sustainability goals in the early planning phase and providing strategic consulting to ensure all criteria are met.

• Documentation and Evidence: Comprehensive recording of the 19 required criteria in the areas of ecology, economics, socioculture, and process quality (including life cycle assessment).

• Interface Coordination: Facilitating communication between design specialists, building owners, and the certification body.

• Quality assurance in construction: Monitoring and inspecting construction work on-site to ensure compliance with strict quality standards.

The Benefits of Having a BNK/BNG Auditor by Your Side

Whether it’s a single-family or two-family home or a larger residential complex with more than five residential units: A qualified auditor not only saves you valuable time during the planning and application process, but also ensures you receive the maximum grant amount from KfW.

Are you planning a sustainable construction project, or do you need an experienced BNK/BNG auditor for your certification? Contact us—we’ll support your project from the very beginning.