Positive Social Housing

Habitat Social Positif (HSP) is a pioneering project to build the first low-cost housing with the "Bepos Effinergie 2013" label in France, carried out in partnership with the Castelnaudary town council, Habitat Audois, Terreal and the Andréossy high school.



Habitat Social Positif (HSP) was born out of an initial exchange between the mayor of Castelnaudary and the president of the Terreal group, Hervé Gastinel, who were keen to put regional skills to use in the service of positive energy housing, prefiguring the houses of 2020. HSP is a collaborative project to build positive energy houses that are comfortable in all seasons, robust, inexpensive and use locally manufactured construction products.

The HSP project is an exemplary territorial project, imagined by key players in the Languedoc Roussillon region

Faced with the challenges identified by the Languedoc-Roussillon Region, the need for efficient housing to cope with demographic growth (30,000 new inhabitants per year) and the risk of climate change (Climate Plan 2030), the need for a sector that promotes the training of professionals and the acquisition of cross-disciplinary skills, The Languedoc-Roussillon Regional Council, in perfect coordination with the ADEME in the region, has decided to promote, through the allocation of technical and financial support, exemplary operations and to promote, on a regional scale, innovative experiences in terms of development, urban planning and the environment. The project of the Commune of Castelnaudary, for the development of phase 1 of the "Vallons du Griffoul" ZAC, fits perfectly into the scheme defined by the region.

An eco-neighbourhood in Castelnaudary: the Vallons du Griffoul

The Vallons du Griffoul ZAC won the "New Sustainable Urban Forms" prize awarded by the Languedoc Roussillon Region in 2010.

Designed on the model of an eco-neighbourhood, it offers new forms of housing in a sustainable, innovative neighbourhood; it is adapted to the needs of the population in all its diversity, respecting the local identity and environmental requirements.

As part of its sustainable development policy, the Commune of Castelnaudary has drawn up a project limiting the impact on the environment, ensuring energy control and paying particular attention to the environmental quality of the ZAC, designed as an eco-neighbourhood, combining consumption efficiency, technical and energy requirements, densification and mixed-use development with a concern for privileged relations with nature, agricultural space and water.

The eco-neighbourhood completes the existing urban fabric, in line with the commune's sustainable development objectives:

  • Urban form and integration: limitation of heights, reduced use of cars, presence of cycle paths, pedestrian paths, proximity of public transport
  • Mixed use: the housing will be individual, grouped individual and collective, and a quarter of them will be in the social stock
  • Water: rainwater recovery, equipment to limit consumption, welcome booklets for future occupants
  • Biodiversity: preservation of woodland
  • Bioclimatic orientation: living rooms facing south
  • Energy: low consumption buildings and solar thermal hot water
  • Waste: pre-sorted areas and composters
  • Materials: local, natural, certified
  • Controlled cost
  • Consultation

Locally produced building materials

The materials used to build these houses are produced in TERREAL group factories located in the Languedoc Roussillon and Midi Pyrénées regions. The various local production sites employ over 630 people.

The clay and sand used to manufacture the bricks, tiles and other decoration and exterior design products selected for the HSP houses come from quarries located within a limited geographical area.

The manufacture of these products cannot be relocated and the quality of the raw materials determines the intrinsic quality of the finished products marketed by the Terreal Group.

These products have been subjected to a life cycle analysis, and many of them have an environmental and health declaration sheet which is available free of charge at www.inies.fr or on request from TERREAL.

  • Colomiers: TERREAL Calibric TH Evolution and TERREAL raw earth partitions
  • Lasbordes: TERREAL monolithic accessories and TERREAL BMI 30 insulated monolithic brick
  • Ségala: TERREAL DCL clay roof tile
  • Lahera : LaheSafe TERREAL insulating and airtight shell; Solterre TH2 TERREAL solar thermal system; Solterre PV TERREAL solar photovoltaic system and LaheRoof TERREAL heat recovery system

An indispensable anchoring in the territories to contribute to the development of local life.


Building HSP means building the future now

The design elements of the Habitat Social Positif (HSP) project were born of the shared desire of the TERREAL group, a building envelope specialist, the town of CASTELNAUDARY and HABITAT AUDOIS to build a comfortable home in all seasons, with significantly reduced energy consumption below the RT2012 thermal regulations, fully accessible to people with reduced mobility and at a perfectly controlled construction cost.

This ambitious experimental project is a pioneering project for the future RT 2020 thermal regulations, which will set comfort and performance rules for new "positive energy" homes, i.e. homes that consume less energy than they produce.

Démarche pédagogique TERREAL HSP


The challenge shared by all of the project's stakeholders, the Languedoc-Roussillon Region and ADEME is that the two dwellings in the Positive Social Housing Project (PSH) are truly low-energy dwellings and therefore consume little energy, including the share of consumption linked to household appliances and media.

This challenge is to understand the influence of the behaviour of the actors for positive energy social housing and how all together, actors of the construction, lessor, tenants, it is possible to go towards energy performance.

Professional training through the implementation of concrete projects

The François Andréossy Building Trades School has had partnerships with the Commune of Castelnaudary and TERREAL for many years. The HSP project is therefore a continuation of these relationships and enables the students to tackle the challenges of tomorrow's positive construction trades through a concrete project.

Learning, before being an accumulation of knowledge, must allow the structuring of a way of thinking!

This form of education is inspired by an old tradition of pedagogues since the humanists of the Renaissance who already considered that: "...the learner is not a vessel that is filled but a fire that is lit..." (Rousseau)

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