• Building Type : Terraced Individual housing
  • Construction Year : 1900
  • Delivery year : 2022
  • Address 1 - street : Pasaje General Bassols 19 08005 BARCELONA, Spain
  • Climate zone : [Csb] Coastal Mediterranean - Mild with cool, dry summer.

  • Net Floor Area : 167 m2
  • Construction/refurbishment cost : 169 300 €
  • Number of Dwelling : 2 Dwelling
  • Cost/m2 : 1013.77 €/m2

Certifications :

  • Primary energy need
    4 kWhpe/m2.year
    (Calculation method : RD: 47/2007 )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

ShowPass is an EnerPhit-Step-by-Step precertified building from beginning of 20th century.

It is also certified as a CO2-neutral building (Ecómetro), combining highest energy efficiency measures with low carbon impact materials.

ShowPass is both an apartment building and a showroom, open to the public to convince project developers of the advantages of Passive Houses, based on construction materials that are respectful with the limited resources of our environment.

The building harmonizes with the urban situation. The street facade is renovated with traditional lime. To preserve the original aesthetics of the urban space, the insulation is laid inwards. Mineral calcium silicate insulation is used, especially resilient against humidity.

A detailed monitoring of comfort and energy data is ongoing since beginning of 2021. These data are analyzed to continuously demonstrate feasibility of CO2-neutral buildings in the Mediterranean. A detailed economic life cycle cost calculation is showing that ShowPass is recovering additional costs in few years.

ShowPass has also included water consumption sensors to raise user awareness, and also installed shower heat recovery units, to reduce energy consumption regarding domestic hot water.  

See more details about this project


Photo credit




    Angelika Rutzmoser, Pasaje General Bassols 19, 08005 Barcelona, Spain, info[a]energiehaus.es tel. 0034931280955

Construction Manager


    Micheel Wassouf, architect, C/Pamplona 88, 3-2, 08018 Barcelona, Spain, wassouf[a]energiehaus.es


Contracting method

General Contractor

Type of market


If you had to do it again?

It would make sence to make a trade-wise assignment of the different works, instead of having a general contractor. 

Energy consumption

  • 4,00 kWhpe/m2.year
  • RD: 47/2007

    The PE consumption is following the Spanish EEC-calculation method, taking into account the PV production. The following values are taken from PHPP calculation, including all electric consumptions (without PV):

    • Heating: 22%
    • Cooling: 21%
    • DHW: 21%
    • Electricity (PH-procedure): 35%

  • 102,00 kWhpe/m2.year

Envelope performance

  • 0,60 W.m-2.K-1
  • Building has been certified following EnerPhit-component methodology.

  • 0,51
  • n50

  • 0,93

More information

The certified calculated primar energy (non renewable) following the EnerPhit-certification is 64 kWhep/m2a (PHPP). The official energy labeling, following RD47/2007 takes into consideration the PV-generation. Therefore, this value is very low: only 4 kWhep/m2a. The step-by-step retrophit is done for the first phase of works: renovation of ground floor and first floor, and partially 2. floor. This 2. floor is going to be renovated in the future. Considerating that this 2. floor is going to be retrophited with the same energy efficiency standard as the realized one, the building is obtaining EnerPhit-Plus standard. Due to the limited roof surface (center town building), the PV instalation is limited. 


    • Heat pump
    • Heat pump
    • VRV Syst. (Variable refrigerant Volume)
    • Double flow heat exchanger
    • Solar photovoltaic
    • Energy recovery from waste
    • Heat pump
  • 34,00 %
  • A Passive House certified compact unit has been installed, that combines mechanical ventilation, recirculation, heating and cooling.

    The aerothermal heat pump for DHW production works with an external passive, solar-thermal evaporator, so no need for electric connection of this unit, and also no noise for the neighborhood.

Smart Building

    Loxone system has been designed especifically for the building, so remote control of all energy relevant components are possible, and energy optimized actions regarding comfort are directly controlable by all users. The system is connected to the weather forecast services, so energy managment is also considered for a robust weekly heating and cooling functioning of the building.

    Two different PV solutions have been installed. On one hand, a mono-cristaline PV systeme, oriented to the south-west, with 1.6kWp, and on the other hand, a CIGS technology system is mounted directly on top of the existing roof, oriented to the south-east, with 1.0 kWp. This system has the advantage of a very easy instalation on existing roofs, so no sub-structure is needed. The PV system has a limited power capacity, du to lack of space on the existing roof. We are dealing with a inner town building, in a high density neighborhood.

    A smart control system has been installed (Loxone-Modbus system), which optimizes energy consumption of the DHW, heating and cooling, depending on the solar contribution of the PV system. Also sun protection and other energy saving measures are controlled by this system, meanwhile the user can always decide directly on behalf of comfort issues.

Biodiversity approach

    The existing patio of the building is upgraded with new planting, and the solid flooring has been upgraded with a permeable wooden floor (thermo-treated).

    An aviary for swifts has been installed on top of the roof, to preserve the natural habitat of these birds, which are typical of the district. 

Urban environment

    In stead of an external insulation (etix), we priorized the rehabilitation of the street facade with traditional lime based technics, so to preserve the original esthetic of the urban environment.

  • 107,00 m2
  • 78,00 %
  • 5,00


    Midsummer SLIM


    Finishing work / Electrical systems - Low and high current

    Midsummer SLIM is the smart combination of thin solar panels and a classic folded metal roof, where the result is a discreet solar cell roof.

    The product is sold as a complete roof renovation. The sheet metal has the same width as the solar panel in order to maximize the installed efficiency without compromizing on the discrete design. Combining a roof renovation and installation of solar panels is both smooth, safe and cost-effective.

Construction and exploitation costs

  • 5 141,00
  • 169 300
  • costs excluding VAT (21% in Spain)

Energy bill

  • 630,00

Reuse : same function or different function

    • Isulation
    • Suspended ceilings
    • others...

    • Gypsum board with a high recyling percentage. Fabricant does not quantify the percentatge. Maximum 10%.
    • Insulation based on textile products, natural sheep-wool, wooden fiber: 100% coming from recycled materials, including glue-elements.
    • Furntiture cabinet made using the old, existing wooden door and window-elements: 95% recycled. 5%: new metal structure.

    See above.

    • Gypsum board: certified by the manufacturer, with a high recycling percentage
    • Textile insulation/sheep wool/wooden fibre/mineral wool: based on recycled raw material
    • Furniture: original old wooden window frames of the building has been partially reused for the construction of a closet.



Circular design

    The fact of having retrofitted the building instead of new building contributes to the reduction of environmental impact of the construction activity. The CO2 neutral certification of the retrofitting contributed to mores then 90% of CO2-emission savings (50 years of LCA, certified by Ecometro ONG).

    Both energy efficiency measures as well as reduciton of environmental impact by low-carbon materials has been implemented reaching maximum certification levels in Europe: EnerPhit certification and CO2 neutral certification, reducing overall emissions up to 90%. The resting 10% of CO2 emissions (51 To-CO2eq.) has been compensated by the adquisition of CO2-certificates.https://showpass.energiehaus.es/

    see "reused batch". Most of insulation materials are coming from recycling technologies: textile insulation, cotton insulation, wood fibre insulation.

Additional information (PDF documents)



Life Cycle Analysis

    A detailed LCA has been carried out, following the Ecómetro methodology.

Water management

    We installed in both bath-rooms digital lecture system to quantify the hot water consumption of the users. This is to sensibilize the user to save water consumption. The installed system is: Defcon8 smart water flow monitor. The consumption values are currently registered for future analisys.

Indoor Air quality

    IAQ sensors are continously registering health and comfort agents inside of the building (MICA from Inbiot firm) https://www.inbiot.es/productos/dispositivos-mica/mica

    All measured pollutants are fullfilling the recomendation of the German Federal Environmental Agency: below 220 ppm of TVOC.


    The Loxone-smart system system is currently managing the temperature level of the dwelling. We are defining comfort temperature at 20.5ºC and in absence mode 19ºC. For summer time, the comfort temperature is at 26ºC and the absence mode at 27ºc.

    The HVAC system also controls humidity level by cooling temperature down. There is no aditional dehumidifier. The Passive House Inatitute is currently testing the certified compact unit (clima+ventilation) under real conditions: Mediterranean.

    In our first summer living in the dwelling, no disconfort issues have been registered. A detailed monitorin is undergoing.

    Due to high airtightness, the building is very silent.

    Removable sun-shading systems guarantee perfect natural lightning and visual acces to the exterior.https://showpass.energiehaus.es/el-proyecto/

General infos

Life Cycle impact calculated for 50 years are 51 To-CO2eq. This emissions have been compensated via CO2-certificates.

Ic Energy

170,00 KgCO2 /m2

Ic Construction

167,00 KgCO2 /m2

Carbon sink

No oil based insulation materials: most of the insulations used are based on recycling technologies:

- NITA Wool (RMT)

- Cotton insulation (RMT)

- Wood fibre insulation (Gutex)

- Mineral wool insulation (Knauf, Rockwool)

GHG emissions

  • 3,62 KgCO2/m2/year
  • Ecometro certification

  • 3,34 KgCO2 /m2
  • 50,00 year(s)
  • End of life impact has not been calculated, as we consider that the methodology is not mature enough. Too hipothetical to estimate technolgies in 2073.

Reasons for participating in the competition(s)

ShowPass is a certified CO2-neutral retrophit of a typical Mediterranean residential housing, with a high replicability effect. The building is located in Barcelona, a city that declared climate emergency in 2020. The building is open to the public, showing real solutions to contribute against climate change. A detailed monitoring program is undergoing, to verify the deasibility of the taken solutions and to spread energy efficiency and healthy building technics to a wide audience.

Building candidate in the category

Users’ Choice

Users’ Choice

Green Solutions Awards 2022-2023
 bioclimatism comfort - olfactory, thermal, visual eco-design ecomaterials energy efficiency housing photovoltaic renewable energies renovation EnerPhit Passivhaus Green Solutions Awards Green Solutions Awards 2022 2023

Share :
Author of the page

Micheel Wassouf


Other case studies



Green Solutions Awards 2022-2023