The all-in-one option

Are you looking for high quality windows that won’t let you down in the years to come, give you the security you need and are uncomplicated to use? If so, then Castello windows by Weru are the right choice for you. Whether you opt for a recessed or semi-recessed system, Castello can meet all your design expectations. This window system has all the key benefits rolled into one, and with an impressive price-performance ratio.

The versatile all-round window

Whether old building renovation or new build project, when you opt for Castello you can look forward to years of enjoyment from your new windows. The reliable inner workings, high degree of operating convenience and reliable hardware make sure of this. In order to satisfy your own personal taste, countless design and colour variants are available for you to choose from and the extra optional features allow you to adapt Castello to your individual requirements. The optional concealed hardware, for example, has greater aesthetic appeal and ensures a clean line.

Castello (Recessed)

Technical features of Castello

 Profile system 5-chamber profile
Installation depth: 70 mm
View: recessed and semi-recessed
2 gaskets
Frame: PVC profile with general steel stiffening
Sash: PVC profile with general steel stiffening
Thermal insulation Thermal transmission coefficient of window up to Uw = 0.76 W/(m²K)
Thermal transfer coefficient of glazing up to Ug = 0.4 W/(m2K)
Sound insulation Sound insulation value of window up to RW = 44 dB
Gaskets Inserted EPDM gaskets (exceptionally weather resistant and highly resilient)
Security 100 kg hinges
Standard mushroom cam locks
Can be upgraded to security class WK 3 according to DIN EN 1627–1630
Hardware fixing All security-relevant and load-bearing components are screwed into steel
Maximum sash sizes Windows 1500 mm x 1400 mm
Balcony doors 1200 mm x 2500 mm



  • Outstanding quality with tried-and-tested technology
  • Large range of products satisfies each individual requirement
  • Reliable classic for renovation and new build projects

Long service life
With Castello, all hardware is screwed into the all-round steel reinforcement
– not just the PVCu, for example. This guarantees problem-free functionality for decades.
Enhanced security
Security corner transmissions are a standard feature of the basic version and ensure greater burglary deterrence. By apply a comprehensive safety concept, the degree of burglary deterrence can be increased up to security class WK 3.
More design variety
We can also manufacture Castello window frames in different widths depending on your individual construction situation; to admit more light via small bathroom windows
for example.
Thermally-separated steel reinforcement
The transmission of heat is significantly reduced by introducing polyamide webs and a polyurethane insulation core between the sections of steel reinforcement (thermal separation).
For the Castello and Palazzo
5-chamber systems the Uf value of
0.2 W/(m2K) has therefore been improved and is now 1.1 W/(m2K).
Permanently tight
Our high-quality EPDM gaskets deliver what they promise, even after many years. The exceptionally weather- resistant material is highly resilient which guarantees long-term tightness. This avoids draughts and heat losses
Ease of cleaning
Owing to their smooth, highly- compressed surface, the profiles are especially dirt-repellent and easy to clean and attract less dust due to the lower static charge. The windows are easy to clean as there are no corners and recesses in the frame.