Windows are purchased once every few years — and their replacement involves costs and renovations. Therefore, when choosing joinery, not only appearance matters, but also the quality of materials, durability, and the integrity of the manufacturer.
We work exclusively with VEKA class A profiles – featuring a 3 mm outer wall and wide chambers that provide insulation, durability, and resistance to damage.
We reinforce the frames and sashes with steel that is 1.5–1.8 mm thick, which translates to stability and safety for years of use.
Our fittings provide comfort and safety in practice:
locking mushrooms with pressure adjustment (summer/winter)
staggered tilt (ventilation control)
handle rotation blockage with a lifter (protection against user error)
hinging for 130 kg in standard
We only use glass from renowned manufacturers – energy-efficient, noise-reducing, and UV radiation-limiting, which improve the microclimate and reduce heat loss.
Finishing is important to us.
We hand-grind the corners after processing, paying attention to aesthetics and precision of details. Each window is also equipped with sill strips with foam or a thermal balcony cover — as a standard, not as a “premium option”.
We don’t use substitutes. Ever.
We don’t skimp on steels, seals, or glass.
This ensures our products meet the highest standards — including those required for passive houses.
When you buy BONA windows, you are purchasing a refined, tested, and trustworthy product.
From material to installation — we do it the way we would want it in our own home.
