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Certification (BIRN) QNG – Reduce CO₂, Make Use of KfW Funding
Are you planning to construct a new residential building and want to focus on sustainability?
And would you like to realize this with funding of up to €150,000 per residential unit through a subsidized KfW loan No. 297 or No. 298, with the current (01/2026) interest rate starting at 1.42%?
If so, certification under Quality Sustainable Building (QNG) at the QNG-PLUS or QNG-PREMIUM level is essential.
However, sustainable construction is far more than an ecological trend—it is a forward-looking standard that combines environmental responsibility with economic benefits. As much as 55% of a building’s total CO₂ emissions are generated during the construction phase alone. Taking action early not only makes an active contribution to climate protection, but also delivers long-term advantages through lower operating costs and attractive funding opportunities.
ESTATE ENGINEERS works with you to develop individual, climate-friendly concepts that rely on low-emission materials, resource-conserving construction methods and compliance with recognised standards - such as DGNB, KfW Efficiency House 40 NH or the state-subsidised QNG certification (Quality Seal for Sustainable Buildings). This certification is the key to funding programmes such as the KfW loan ‘Climate-friendly new build’, which enables funding of up to €150,000 per residential unit, depending on the design.
The requirements for QNG certification are comprehensive: CO₂ limit values based on a life cycle analysis, ecological and social criteria, aspects such as healthy living, comfort, accessibility and resource-saving operation must be fulfilled and documented. For owners, investors, private house builders and planning partners, this means complex processes, many interfaces - and a clear need for professional project management.
ESTATE ENGINEERS manages the organisation and coordination of sustainable construction and certification for you. We ensure the structured involvement of all parties involved, take over communication with certification bodies and specialist planners as auditors and ensure that all QNG criteria can be fulfilled efficiently, with quality assurance and on time. In addition, we actively support you in applying for and utilising state subsidies - from consultation and application to documentation.
Our goal: sustainable properties that impress in ecological, economic and functional terms. With our experience, our network and our commitment to quality, we make your construction project ready for a subsidisable and sustainable future - from planning to handover.
ESTATE ENGINEERS - your partner for sustainable construction with responsibility, structure and vision.
Preparation | Planning | Realisation
ESTATE ENGINEERS supports you with certification (BIRN) in accordance with QNG - for residential and non-residential buildings, new builds and refurbishments. We coordinate processes, certificates and partners - competently, on schedule and eligible for funding.
Efficiency | Sufficiency | Consistency
ESTATE ENGINEERS supports you with certification (BIRN) in accordance with QNG - for residential and non-residential buildings, new builds and refurbishments. We coordinate processes, certificates and partners - competently, on schedule and eligible for funding.
All certificates are fully eligible.
Definition | Accounting | Evaluation
ESTATE ENGINEERS
STATE ENGINEERS creates life cycle assessments (LCA) for new construction and existing projects that comply with funding and certification requirements
Life cycle assessment in accordance with DIN EN 15978 with:
Result: Verifiable LCA result report for subsidy programs and sustainability certifications (KFN, KNN)
Definition | Differentiation | Decision
ESTATE ENGINEERS analyses the life cycle costs for all building products and variant calculations
