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First DGNB Certification of a Serial Renovation

Berlin / Nuremberg, June 15, 2026 – The joint serial renovation project by ecoworks and Dawonia in Nuremberg is the first serial renovation project ever to receive DGNB Silver certification as well as the "Qualitätssiegel Nachhaltiges Gebäude" (QNG) (Quality Seal for Sustainable Buildings). Furthermore, as the first serial renovation, the project achieves the Sustainability Class (NH Class) under the Federal Funding for Efficient Buildings (BEG).

Pioneering for the industry: With the QNG seal, the project receives recognized proof of sustainability, which not only documents high quality standards but also confirms the long-term ecological and economic viability of the solution. “We are delighted that the NH Class enables a 5 percent repayment subsidy under KfW funding for this project and, in the long term, for further follow-up projects for our customers,” says Emanuel Heisenberg, founder and CEO of ecoworks.

From Renovation Project to Certified Sustainability Reference

The joint project between ecoworks and Dawonia comprises three multi-family apartment buildings built in 1966 in Nuremberg, with a total living area of 4,799 m² and 72 apartments. “The successful implementation of the demanding KfW Efficiency House 55 NH standard by the two project teams fills us with great pride. A result that is unique in this form so far,” says Sebastian Gefeller, COO of Dawonia.

The DGNB Silver certification now achieved, including the QNG seal, confirms this ambition: With an overall compliance rate of over 50 percent and a top score of around 76 percent in the Ecology section, the project sets new standards for existing buildings undergoing serial renovation.

“Serial renovation offers great potential to bring sustainability standards to the building stock more quickly and more broadly. Due to the high level of prefabrication and standardization, quality requirements can be systematically implemented and transparently proven via certifications. We therefore see significant potential to secure the quality of renovations through certification processes and to roll out sustainable solutions on a broad scale using serial technologies,” says Dr. Christine Lemaitre, CEO of the DGNB.

About ecoworks
ecoworks is the housing industry's partner for affordable, energy-efficient renovation. As a general contractor, ecoworks accompanies housing companies from the initial idea to mass-market serial implementation. With an 80 percent degree of prefabrication, ecoworks plans, designs, and installs facade and roof elements to renovate multi-family apartment buildings to NetZero standard within a few weeks. The Berlin-based company is considered a pioneer and innovation leader for serial renovation in Germany and is currently working on more than 20 projects nationwide.

About Dawonia
With around 25,000 apartments, Dawonia is one of the largest real estate companies in Munich and southern Germany. A team of around 360 employees is dedicated every day to ensuring that Dawonia's tenants and buyers feel completely at home in their own four walls. For 90 years, Dawonia has been planning, developing, building, and managing modern and affordable apartments. Through consistent investments, the portfolio is continuously maintained, modernized, and expanded; sales revenues and rental income are largely reinvested. Active and agile portfolio management is the success strategy for the future viability of the company, which has belonged to an owner consortium led by Patrizia Alternative Investments (PATRIZIA SE) since 2013.

About the DGNB
The German Sustainable Building Council (DGNB) is Europe's largest network for sustainable building. Since its foundation in 2007, it has been committed to promoting sustainability in the construction and real estate industry in a holistic manner. With its certification system, the DGNB evaluates buildings and districts based on ecological, economic, and social criteria throughout their entire life cycle. The aim is to create transparency, ensure quality, and support the transformation toward a climate-neutral building stock.

Press Contact ecoworks
ecoworks GmbH
Lübecker Str. 1-2, 10559 Berlin
Press inquiries: presse@ecoworks.tech

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