Danish manufacturer Velux is one of the established system providers for timber construction projects with its roof windows and roof exits. While the brand has historically been known primarily for manually operated tilt-turn windows for residential buildings, the portfolio today also includes electrically controlled variants with integrated ventilation and shading technology. For planners and contractors in timber construction, thermal performance values, installation dimensions, and compatibility with timber structures are the decisive factors.

Product lines: GGL, GPU and flat roof windows

The core assortment is divided into three main series: The GGL line comprises manually operated tilt-turn windows with a timber core and plastic outer shell, which are particularly used in attic conversions. The thermal transmittance coefficients range from 1.0 to 1.3 W/(m²·K) depending on the glazing, with triple glazing filled with argon forming the standard for KfW energy-efficient building renovations. The GPU variant with white polyurethane coating is designed for wet rooms and bathroom applications, while the flat roof window series CVP is designed for roofs with a 0 to 15 degree pitch.

For architects and carpentry firms planning with laminated timber beams or cross-laminated timber elements, the installation depth of the frames is relevant: Velux specifies a frame height of 95 mm for the GGL models, which integrates well into conventional rafter construction with 60 to 80 mm rafter height. However, for multi-storey timber structures with higher requirements for sound and fire protection, additional glazing options and insulated frames are necessary, which Velux offers as system components.

Market position and differentiation

In the German-speaking market, Velux competes with providers such as Roto and Fakro. While Roto increasingly focuses on low-maintenance fittings and modular additional products, Velux positions itself through a comprehensive system offering: frames, insulated frames, roller shutters and sun protection all come from a single source. Manufacturers do not publicly disclose market shares, but industry observers assume that Velux is a leader in the premium segment with approximately 30 to 35 percent market share.

A distinguishing feature is the integration of smart home controls: The Velux Active platform combines electric window drives with sensors for temperature, humidity and CO₂ concentration. For larger timber construction projects with multiple roof windows – for example in apartment buildings or office buildings – central control can reduce maintenance costs and automatically regulate indoor air quality.

Recent developments: Photovoltaics and building integration

Recent product updates concern the integration of photovoltaic elements into the roof window frames as well as optimized glazing with selective coatings to reduce summer overheating. Velux has also further developed flashing frames for connection to metal coverings and slate, which is relevant for architects when planning roof landscapes under heritage protection or historically oriented timber construction projects.

For contractors in interior finishing, the supply chain is crucial: Velux operates its own production facilities in Europe, so lead times are typically three to four weeks – an advantage over import-dependent providers who can face bottlenecks due to freight delays. For timber construction companies that plan timber framing and roof construction in one operation, Velux offers technical planning documents in BIM format that can be directly integrated into common CAD systems.

Conclusion: System provider with a focus on thermal insulation and automation

With its roof window lines, Velux primarily covers residential and commercial construction with pitched roofs. The thermal performance values meet current EnEV and KfW requirements, while the system integration of shading, ventilation and smart home controls provides planning security for larger timber construction projects. For contractors in windows and doors, the question of interfaces with timber-aluminium window systems from other manufacturers such as Schüco remains relevant, as mixed window systems are often used in renovations.