Extension + refurbishment

  • Building Type : School, college, university
  • Construction Year : 1987
  • Delivery year : 2022
  • Address 1 - street : 29 avenue Général Leclerc 69007 LYON, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 3 100 m2
  • Construction/refurbishment cost : 4 500 000 €
  • Number of Pupil : 699 Pupil
  • Cost/m2 : 1451.61 €/m2

Certifications :

  • Primary energy need
    65.52 kWhep/m2.an
    (Calculation method : RT existant )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

This project won the Renovation Prize of the 2022 Resilient Building Trophies.

Transformation of an office building into a 3rd category ERP higher education school with the aim of achieving excellent level HQE certification . All available existing surfaces are used to contribute to urban densification and reduce urban sprawl. The project integrates a biosourced elevation on R+8 associated with the establishment of a plant terrace and a vegetable garden and an extension in the basement for the creation of living spaces with a supply of natural light and the creation of patios .

The project is part of a low-carbon and circular economy approach (reuse, biosourced, geosourced, recycled or recyclable products) and calls on local players. It is suitable for summer heat waves in urban areas (cold production up to 55°C compared to +- 35°/40°C for conventional heat pumps) with extreme temperatures expected in the coming decades. It contributes to the reduction of heat islands by adding green surfaces at the foot of the building and on 3 terraces.

The energy process mixes a low tech and high tech design. It incorporates a technological innovation developed in France 20 km from the site: a greenhouse gas-free heat pump (negative GWP - Global Warming Potential) installed on the roof which covers 70% of the building's needs, which operates without electrical resistance and which stores heat in winter and cold in summer. This Pac is coupled with double flow ventilation and an adiabatic unit (passive cooling). A self-consumption photovoltaic plant on the roof contributes to smoothing the electrical consumption of the process. It anticipates the tertiary decree and presents a gain in energy consumption > 60% compared to 2010. The building is connected for overall performance monitoring (energy, water, indoor air quality) with open access to users. Finally, it integrates an educational approach intended for the actors of the building site (increase in competences), the future students of the school and the local residents.

Building users opinion

Le niveau de satisfaction est élevé de part des élèves, du corps enseignants et du personnel administratif. Le directeur témoigne dans la video du projet . Un accompagnement usager est mis en place

If you had to do it again?

Dans l'ensemble peu de dysfonctionnement à l'exeption de la finition des murs en peinture dans les salles de classes et dans les couloirs . Il eut été judicieux de placer des protections murales de pide de mur.                                                                  Compte tenu de la politique de sécurité informatique de l'école, l'ouverture de ports informatiques externes pour créer des accès extérieurs aux données environnementales ( énergie , QAI, commande des équipements ) est contraint par une procédure d'autorisation  assez longue. 

See more details about this project


Photo credit



Construction Manager


    Construction Manager

    Sophie Sturlese et Marc Campesi : Architecture et Eco-ingéniérie



    Filing of the building permit (modification of facade and change of destination)

Contracting method

General Contractor

Type of market


Energy consumption

  • 65,52 kWhep/m2.an
  • 99,02 kWhep/m2.an
  • RT existant

    Heating (electric) Cep = 21,1 kwhEp/m² (in French) Cooling (electric) Cep = 6.35 kwhEp/m² (electricity) Lighting (electric) Cep = 11.69 kwhEp/m² (electricity) Auxiliary (electric) Cep = 4.22 kwhEp/m² (electricity) Ventilation (electric) = 24.41 kwhEp/m². Photovoltaic (electric) Cep = 2.26 kwhEp/m².

  • 187,12 kWhep/m2.an

Real final energy consumption

    25,40 kWhef/m2.an

Envelope performance

  • 0,40 W.m-2.K-1
  • Composition of the envelope :

    - Basement wall (interior insulation, biofib'Trio) U = 0.241 W/m².°C
    - Exterior wall on west and north facades (exterior insulation, rock wool + brick or ceramic cladding) U = 0.229 W/m².°C
    - Exterior wall East facade (interior insulation, biofib'Trio) U = 0.241 W/m².°C
    - Exterior wall on R+8 elevation (wood frame with Biofib'Trio insulation) U = 0,187 W/m².°C
    - Interior wall on unheated room (Biofib'Trio) U = 0,236 W/m².°C

    - R+8 / R+6 / R+1 terrace ceiling: reused compressed polyurethane insulation
    - R+7 terrace ceiling: 30 cm Biofib'Trio insulation

    - floor on outside U = 0,237 W/m².°C
    - interior floor on unheated premises U = 0.271 W/m².°C
    - floor on ground level U = 0,003 W/m².

    The building envelope combines a controlled inertia with a strong external insulation of the facades (14 cm) dressed with a terracotta and ceramic facing which slows down the heat transfer in summer.

    Solar factors of the external joineries (without taking into account the solar protections)
    - vertical windows Sw = 0,35
    - horizontal windows Sw = 0.15

    The external solar protections on the exposed facades (West) are optimized to let the sun through in winter and to limit the solar gains in summer.


  • 0,98


    • Heat pump
    • Other hot water system
    • Reversible heat pump
    • Others
    • Nocturnal Over ventilation
    • Double flow heat exchanger
    • Solar photovoltaic
    • Other, specify
    • Heat pump
  • 3,00 %
  • Greenhouse gas free (GWP <1)

    - a self-consumption photovoltaic plant that will smooth out the consumption of the heat pump
    - an energy storage module (hot and cold) of 14 kWh integrated in the heat pump which is recharged thanks to the self-consumption PV plant

    - module adiabatique permettant de rafraîchir de manière passive l'air extrait de la CTA double flux qui refroidit l'air entrant
    - fenêtres en oscillant battant (sauf sur la façade pompier)
    - surventilation nocturne (bâtiment à forte inertie)

Smart Building

    The shutters are controlled by facade and level blocks in order to take into account the differentiated solar gains between the West and the East and the lower / upper floors of the building. Usage scenarios can also be set.
    Air quality sensors are distributed in the building.
    The air handling units have internal alarm systems that inform in case of defect or need of maintenance (filter change for example).
    Some doors have access controls that inform the operator when they are not closed.
    Access to this data will be online for public access users with a custom designed ergonomic interface.

    The online data of the PV plant is accessible on a digital platform with an ergonomic interface.


    • Flooding/Slow flood
    • Earthquake
    • Urban heat island

Urban environment

  • 782,00 m2
  • 100,00 %
  • 239,00
  • Near and far environment

    The rehabilitated building is located in the heart of downtown Lyon, on the banks of the Rhône, opposite the Confluence district, at the crossroads of avenue Leclerc and rue des Girondins in Lyon 7th:

    • Vela Verde is the end of a linear built sequence of R+7 housing attached to the South gable ;
    • to the north, on the other side of the rue des Girondins, are the buildings of the military base of the Frère General Headquarters ;
    • to the west is Avenue Leclerc and the Berges du Rhône ;
    • to the east, a housing program has recently been built partly attached to the gable of the building.

    This building is ideally located within a mixed district in full mutation .

    Connected to the city, it is also connected to nature. Located along the quays of the Rhône, it benefits from proximity to the requalified banks, the distant landscape and privileged views of the hills of Lyon .
    Access is easy thanks to the proximity of bus stops, Velov' stations and the B Jean Jaurès metro stop, which is only a few streets away. It is smoothly connected to the hypercentre and transport hubs .


    A complementary program to existing installations

    Vela Verde is a project integrated into its neighborhood. It is part of the continuity of the logic of development of the 7th district, echoing the future campus of the green EM Lyon.

    In addition, it is close to existing student residences and sports fields that will benefit future students on campus. The establishment of the school will create a socio-economic dynamic beneficial to food, health and catering businesses in the surrounding area.

    The existing building is being transformed to meet a new use. This building formerly housing the offices of MACIF will soon house a higher education school. This is a transfer from a school already established in the 7th arrondissement.

    In the basement of the building, the parking lots have been converted mainly into 2-wheel parking in order to promote the possible soft movements thanks to the development of the traffic lanes on the upper and lower quays of the Rhône.

    The green spaces are increased in order to integrate into the green fabric of the district and enrich it.


    Vela Verde wants to generate a long-lasting positive local impact, both environmental, social and economic, as well as being a source of inspiration on the scale of the 7th and the city.


    Greenhouse gas-free heat pump with cold and hot energy storage



    HVAC, électricité / ventilation, cooling

    The VEOTHERM heat pump is an innovative solution that meets the current challenges imposed by climate change: ensuring the thermal comfort of building users while limiting the impact of heating and air conditioning equipment on the environment.
    This heat pump operates over a temperature range of -35°C to +55°C and thus enables the building to be cooled whatever the outside conditions, including during heat waves. In addition, it has an excellent energy efficiency as shown by its A++ energy rating.
    It allows the storage of thermal energy (heat and cold) thanks to the presence of phase change materials. This energy is free and produced mainly by the photovoltaic plant when it is not required.
    This heat pump does not emit CO2 or other pollutants and its refrigerant has a GWP (Global Warming Potential) < 1.
    It does not require electrical resistance in winter.
    It generates little noise pollution: its sound level is around 42 dbA at full power.
    The VEOTHEM heat pump can also be coupled to a direct current photovoltaic power supply.
    It is locally manufactured: less than 20 km from the project, with a very high reparability index that limits dependence on imports.


    Souchier Boullet

    01 60 37 79 50 / 01 60 37 79 89


    HVAC, électricité / ventilation, cooling

    The cooling of the interior of buildings is a major issue because it is associated with an increase in the use of air conditioning, which causes an increase in energy consumption.

    ADIABOX NFG is a passive cooling solution by evaporation. Before using the heat pumps to cool the building, the adiabatic system will lower the temperature of the air blown by the double flow AHU by 5 to 6 without energy.
    When hot air comes into contact with water (present in the wet exchanger of the equipment), it causes evaporation. The energy required to evaporate the water is extracted from the air, which then cools down. The efficiency of such a system increases with temperature (since an increase in temperature is accompanied by a decrease in relative humidity).

    This cooling system makes the electrical consumption of the equipment negligible compared to a mechanical system equipped with a cold water coil. Its water consumption is also reduced. Rainwater could be recovered in a future approach.
    Its operation does not require any refrigerant gas and therefore does not generate any pollutants.

    The design of the equipment is very simple and thus greatly reduces the risk of breakdown. Only a circulation pump, a water inlet solenoid valve and a drain valve are necessary for its operation. It has no compressor or high pressure refrigeration circuit.

    The health of the users is also favored by a healthy blown air without micro-droplets and thus without risk of micro gutter.

    Double flow air treatment unit (energy recovery)

    France Air


    HVAC, électricité / ventilation, cooling

    The Powerplay dual flow unit from France Air is a high performance energy recovery system for hygienic and comfort ventilation with preheating and cooling of the supply air. This AHU is coupled with adiabatic on the extracted air to ensure the cooling of the building, as well as on the heat pump to ensure the heating of the building.
    The health of the users is preserved thanks to the optimal quality of the blown air ensured by the pre-filtration and filtration of the fine particles ISO ePM1 80%.
    Its impact on the environment is further reduced by its very low consumption motor and its Eurovent certified rotary exchanger (efficiency up to 90%).

    Biofib Trio thermo-acoustic insulation (hemp, cotton and linen)


    02 51 30 98 38 / isolation[at]biofib.com


    Finishing work / Partitions, insulation

    Biofib'Trio insulation is a thermal and acoustic insulation solution that respects the environment. Its very good thermal phase shift provides excellent comfort in both summer and winter. The hemp of the panels brings a natural regulation of hygrometry to the building.

    Combining hemp, cotton and linen, this material is of natural and renewable origin and thus contributes to the preservation of the biosphere. It is certified as a Biosourced Product.
    The hemp and flax are of French origin and the cotton is recycled.

    Biofib'Trio insulation is a healthy, VOC-free, non-allergenic and non-irritating product that contributes to the preservation of users' health, as evidenced by its A+ health label.

    plates coals



    Structural work / Structure - Masonry - Facade

    Mapei's epoxy resin impregnated carbon fiber pultruded sheets are a solution for repairing and reinforcing reinforced concrete elements damaged by physical-mechanical actions. It is an alternative to traditional structural reinforcements based on steel plates which are less environmentally friendly. These carbon plates also have the A+ health label.

Construction and exploitation costs

  • 366 000,00
  • 440 000
  • 4 563 000

Energy bill

  • 36 000,00

Reuse : same function or different function

    • Structural works
    • Isulation


    Gravel - 4 tons


    Polyurethane foam - 50 sqm


    Re-used lighting fixtures (under order)

    The gravel on the roof of the old building has been preserved. They protect the waterproofing and contribute to the aesthetics of the roof terrace (reuse in situ)

    The polyurethane foam, insulator of the old roof, has been kept in part to insulate the terraces and raise the level of the terrace at R+1. (reuse in situ)

    Lumianire made from old window frames reconditioned in France by a professional integration establishment.

Economic assessment

  • 4 000
  • 1 000
    • Purchase by the company from a reuse platform

Water management

  • 1 608,00 m3
  • HQE reference method for calculating annual water consumption from the network.
    Water quality analysis by a laboratory

Indoor Air quality

    9 sensors and online access for users

    • fine particles, CO², hygrometry, temperature, noise ;
    • 3 CTA equipped with filters ;
    • a preventive approach on low-emission materials (A+ label, EC1+ label, Excel, Floor Score) ;
    • post-operational monitoring with critical threshold alerts.


    To guarantee the health and comfort of the inhabitants, here are the strategies put in place:

    • A fitness trail staircase ;
    • The creation of a "ZEN" break room without electromagnetic field and soft light ;
    • The creation of an educational vegetable garden with an introduction to permaculture on R+8 ;
    • The creation of green spaces planted at the foot of the building with pedestrian seats and 3 accessible vegetated terraces ;
    • The creation of 125 bike and scooter spaces in the building ;
    • The choice of heat pump on the roof with low noise emission to reduce noise on the roof.

    In order to guarantee the comfort of use of the premises in occupation the objective is to contain the reverberation time to a value below 0.8 seconds. These values are, in the case of the regulation for speech frequencies, i.e. covering the octave bands from 500 to 2000 Hz.

    To achieve these objectives, false ceilings with high acoustic performance have been installed.

    The entrance hall is a place of passage particularly prone to the effects of noise. This is why it has benefited from an additional acoustic treatment provided by a treatment of wood panels and biosourced acoustic insulation on the ceiling and walls. A planted wall also contributes to the acoustic comfort of the entrance hall.

    Dans chaque pièce du bâtiment il y a un très bon apport naturel et celui-ci permet d’être caractérisé comme « non éblouissant » car les FLJmoy sont supérieurs à 1,2 dans les bureaux et les salles de classes, mais ne sont pas trop importants car les FLJm

GHG emissions

  • 3,07 KgCO2/m2/an
  • Perimeter covered: all the building's energy consumption items (RT items, non-RT real estate, and furniture)

    Standard: HQE

    Calculation method: The CO2 emission factors for the energy consumed are those taken from Appendix 3 of the "Energy-Carbon" standard for new buildings, expressed in kilograms of CO2 equivalent per kilowatt-hour of final energy.

  • 50,00 année(s)

Reasons for participating in the competition(s)

Candidature aux Green Solutions Awards 2022-2023

Le projet Vela Verde concourt aux Greens Solutions Awards pour mettre en valeur des solutions efficientes et reproductibles visant à massifier des opérations de réhabilitation bas carbone et zéro énergie fossile. Le chantier  a été livré en septembre 2022, pour la rentrée des étudiants du campus ECEMA Lyon, Campus de Paris. La collaboration et la bonne communication des parties prenantes du projet  en amont et tout le long du chantier ont permis de réaliser cette opération réhabilitation lourde   en moins de 12 mois dans un contexte sanitaire difficile.

Le projet allie un haut niveau de performance énergétique et environnementale avec un recours généralisé au produits biossoucés et une approche  confort usager, qualité de l'air intérieur et bien-être au travail . Il associe low tech avec son enveloppe performante et ses systèmes passifs et les dernières technologies en termes de production de froid et chaleur et de production et de  stockage d'énergie. L'ensemble est monitoré pour le suivi en continu de la perfomance énérgétique , des consommations d'eau et de la qualité de l'air intérieur.

Le bâtiment est conforme au décret tertiaire objectifs 2050 . Il  propose une innovation remarquable  développée en France près de LYON . Il s'agit d'une nouvelle génération de Pompe à Chaleur PAC sans gaz à effet de serre , pouvant stocker de l 'énergie (chaud et froid) et fonctionnant dans des conditions extrêmes de température de -35°C à +55°C. En ce sens, l'éco-rénovation Vela Verde répond aux ambitions du concours en termes de développement durable et de lutte contre le changement climatique pour le secteur de la construction et de la ville durable.

Les îlots de chaleur urbains sont une préoccupation croissante dans les cœurs de ville et peu de solutions sont proposées dans les bâtiments existants. Le bâtiment est en mesure  de satisfaire au confort des usagers en période de canicule et de préserver l'activité dans le bâtiment. Le stockage de froid permettra de limiter le fonctionnement des PAC qui ne font qu'aggraver la surchauffe urbaine. Enfin l'augmentation notable de la surface végétalisée au détriment des surfaces minérales participe au rafraichissement urbain. La réhabilitation est un enjeu majeur, notre approche est viable et reproductible. 

Green Solutions Awards 2022-2023
 building eco-renovation revegetation smart building materials and solutions biosourced energy self-consumption renewable energies photovoltaic circular economy reuse recycling competition Resilient Buildings Trophies 2022 Green Solution Awa

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Author of the page

Marc Campesi

Ingénieur génie civil bâtiment - Designer bâtiment durable

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Green Solutions Awards 2022-2023

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Competition winner

Green Solutions Awards 2018 - Quartiers (Francophonie)