This semi-detached house from the 1960s had been home to the same family for more than two decades. Initially slated for energy-efficiency upgrades alone, a closer look revealed deeper issues and untapped potential throughout. This discovery prompted Wendling Architektur from Cologne to undertake a comprehensive renovation and expand the unused attic space. The result speaks for itself: the building now captivates with timeless, classical elegance—inside and out.

Premium mineral insulation and a robust new clinker facade do more than enhance indoor climate—they virtually eliminate future maintenance concerns. The new wood-aluminium windows sit in harmonious frames of dark red brick and substantial natural stone sills. Two newly added dormers give the roofline visual interest. Designed without overhanging eaves and finished in uniform dark tiles with colour-matched titanium zinc details, the roof maintains a refined restraint. Every detail has been thoughtfully executed, lending the structure a refined character and striking the perfect balance between contemporary design and classical tradition.Inside, the original floor plan remains largely intact across both levels—save for a formerly unused loggia, now converted into living space. All visible surfaces received a complete refresh: concrete-finish porcelain tiles define the bathrooms, kitchen, and entry; traditional mosaic oak parquet graces the living areas. The original natural stone staircase between ground and first floors was preserved in pristine condition. A sculptural white-lacquered steel spiral staircase now anchors the interior, ascending to the converted attic. This new upper-level apartment—featuring two generous dormer windows—extends the home for the owners' daughter and her family, while the open stairwell preserves a visual connection to the parents' quarters below. The flexible layout encompasses living spaces, a full bathroom, and a small kitchenette.State-of-the-art building systems round out the transformation: an air-source heat pump, central ventilation, water softening, and a substantial solar array installed across the dormer roofs all bring the home into the 21st century. Underfloor heating—engineered as a slim-profile system to fit the existing floor structure—provides warmth throughout. A KNX-based smart home system orchestrates countless functions seamlessly. The basement houses all the mechanical systems with room to spare—including a newly installed sauna.

www.wendlingarchitektur.de

Photography:
Ben Van Skyhawk
www.benvanskyhawk.com

(Published in CUBE Cologne Bonn 02|25)