Our Company – Harnois TCH ALPES

Discover Harnois group

« Each project is subject to a thorough review and specifications. »

This is a national network of independent companies entirely dedicated to Processes and The Harnois Charter, thus offering the guarantees of the national’s 1st habitable space creation.

We are real creators of space. All of our experience is at your disposal, Harnois processes ally tradition and modernity. The techniques we use have been developed by a true framing professional, carpenter himself for over thirty years.

This partnership therefore allows multiple human sized agencies, it is so we can listen to you and your projects.

TCH ALPES of Harnois network offers services in the following departments:
74, 73, 38, 69, 01


M € in turnover

The HARNOIS Processes in France represent a turnover of about € 40 million with a score of exclusive concessionaires.

thousands of cellars

Nearly 30,000 cellars were built in France by Harnois group since its creation.

thousand attics

To date, the group Harnois completed nearly 80,000 attics in France since 1976.

years of experience

TCH ALPES of Harnois group LEADER for 30 years in attics layout.

Our History

  • 1981International launch

    An advertising campaign, cellars associated with attics, provides the international launch of Harnois processes.
  • 1979International Construction Industry Trade Fair

    The Interational Construction Industry Trade Fair of 1979 awards the best innovation award to the Harnois cellar.
  • 1979HARNOIS becomes a brand

    HARNOIS is a registered trademark, backed by a national network of companies.
  • 1975The company’s creation

    In 1975, Georges Harnois has upset many misconceptions, being the inventor of attics transformation processes and the creator of a new profession. The Harnois process now represents 80% of the attics market in France.