GUILLEN as a manufacturer and installer of industrialized woodwork is not only concerned with the aesthetic appearance of the units produced in his factory, but its functionality and adaptability to the needs of our customers and of course in the potential impact in the environment.

We have a strict quality control in the design of the joinery units in our standard series, supported by both the Spanish Association for Standardization and Certification (AENOR) (mark N as certificate No. 008/000143) as the Technical Research Association of Woodworking Industries (AITIM) (quality seals re 1-41-01, -03, 06/05/01, 09/16/01, and -02).

We apply our Quality Management according to the UNE-EN ISO 9001:2015 certified by AENOR with the right to use the brand ER-0533/2009.

In recent years we have carried out an extensive research and development program for new products in order to adapt the woodwork in the field of fire resistance, ventilation and soundproofing to current trends.

The development of these new carpentry product, in collaboration with relevant suppliers and Accredited Laboratories, has led to patent, through the Spanish Patent and Trademark Office, any of them according to utility models with publication numbers: 1037570, 1049878, 1049982 and 1052471.

Finally, on February 24, 2012, have been granted to "GUILLEN Industrias de la Madera" the certification in the FSC® seal with License Code: FSC-C109916