Can Mati – Viladecans (Spain)

Last modified by the author on 22/02/2023 - 18:59


  • Building Type : Isolated or semi-detached house
  • Construction Year : 2021
  • Delivery year : 2021
  • Address 1 - street : C/ de Pi i Margall, 27 08840 VILADECANS, España
  • Climate zone : [Csb] Coastal Mediterranean - Mild with cool, dry summer.

  • Net Floor Area : 208 m2
  • Number of Dwelling : 1 Dwelling

Certifications :

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

Can Mati, a historic farmhouse of peasant origin, in Viladecans, becomes the first Passivhaus-certified home in the city. The project allowed to maintain the existing structure and aspect of the building, while creating bright and generous spaces. It renews the envelope energetically, with efficient facilities, and a self-consumption photovoltaic installation. The house is now Passivhaus EnerPHit Classic certified.

The tightness reached a good value of n50=0.5 ren/h, which meets the Passivhaus criteria for new construction. Simple solutions have been applied, such as plastering and waterproofing of the roof. Sealing membranes have only been used occasionally.

External insulation has been applied where possible. For conservation purpose, the upper part of the main facade has been insulated with crushed cork insulation and Diathonite lime mortar from Diasen. The patio facade was insulated with rockwool SATE with Com Cal mortar. The horizontal elements were insulated with wood fiber, with the exception of a second layer of XPS insulation on the roof membrane to protect the construction from condensations. As a whole, the intervention reduces heating demand by 90% compared to the initial state.

See more details about this project

Data reliability

3rd part certified

Photo credit

Pol Viladoms


    Construgiba SL


    Thermal consultancy agency

    Praxis Resilient Buildings


    Consulting & Passivhaus design; blower door essay


    Josep Maria Fosalba i Julià - Oftecnics

    Technical Architect / Director of Work Execution


    Instal.lacions R.B.G

    Installer company


    Bernuz Fernandez SLP

    Structural calculation

    Certification company

    Energiehaus Arquitectos SLP

    Passivhaus certification company



    Manufacturer of the mechanical ventilation system with Passivhaus heat recovery


    Maderas Casas S.A

    Window manufacturing company


    Diaz Fusters S.L.

    Interior carpentry

Contracting method

Separate batches

Owner approach of sustainability

The objective of the promoters was to adapt an urban farmhouse in the historic center of Viladecans to the 21st century. Carefully rehabilitated, maintaining the existing substantial structure and wrapped with excellent thermal insulation, this building received the German Passivhaus EnerPHit certification. In addition to energy efficiency, the project considers indoor air quality, as well as the environmental impact of construction materials.

Building users opinion

High level of comfort both in winter and summer, with excellent indoor air quality, and very low energy bills.

Energy consumption

  • 76,00 kWhpe/m2.year
  • 250,00 kWhpe/m2.year
  • Other

  • 38,00 kWhfe/m2.year
  • Final energy consumption for all consumptions, calculated with PHPP v.9 of the Passivhaus Institut, is 38 kWh/m2·a.

    Actual consumption measured during the year 2022 is 29 kWh/m2·a.

Envelope performance

  • 0,41 W.m-2.K-1
  • Exterior wall:
    - 10mm lime mortar
    - Rockwool RockSATE DUO Plus 120mm insulation
    - Existing mortar 20mm
    - Existing masonry wall 355mm
    - Plaster plaster 15mm
    U = 0.270 W/m2 K

    - Gravels 50mm
    - 100mm XPS insulation
    - EPDM
    - Pavtherm 100mm wood fiber insulation
    - Existing ceramic vaults 90mm
    - Plaster plaster 15mm
    U = 0.190 W/m2 K

    - 20mm soft ceramic flooring
    - 10mm adhesive mortar
    - 50mm mortar
    - Rocksol E525 80mm stone wool insulation
    - Hermetic and breathable sheet
    - Gravels 100mm
    U = 0.426 W/m2 K

    - Esperia 89 - Sirio Alumino
    - Triple glass: 44XN/18ARWE/4/18ARWE/4XN
    - Skylight: Velux DOME
    Uw = 0.88 W/m2 K


  • 0,50

Real final energy consumption

    29,00 kWhfe/m2.year

    2 022


    • Heat pump
    • Heat pump
    • Reversible heat pump
    • Fan coil
    • Natural ventilation
    • Double flow heat exchanger
    • Solar Thermal
    • Heat pump
  • 50,00 %
  • Bomba de Calor Mitsubishi PUHZ-SW120VHA con Fancoil Mitsubishi i-LIFE2 HP 1002 y 1202
    Zehnder ComfoAir 450 ERV

    4.44 kWp photovoltaic generator; Zehnder ComfoAir 450 ERV heat recovery ventilation unit with Passivhaus component certification

    Great openings to the south

GHG emissions

  • 20,00 KgCO2/m2/year
  • PHPP & Missed

  • 100,00 year(s)


Reasons for participating in the competition(s)

El principal reto al que nos enfrentamos en el entorno construido es- precisamente- la rehabilitación del parque de viviendas existentes, para crear hogares saludables, confortables & con consumo energéticos bajos. El proyecto muestra un pequeño ejemplo de lo que es posible dentro del ámbito de la rehabilitación energética integral, logrando una reducción de 90% en la demanda de calefacción en comparación con el estado inicial.

Uno de los hitos del proyecto fue la hermeticidad al aire, donde se alcanzó un excelente resultado de n50= 0,5 ren/h en el ensayo Blower Door, cumpliendo los criterios Passivhaus para obra nueva. Se han aplicado soluciones sencillas, el enyesado y la misma impermeabilización de la cubierta. Solo puntualmente se han utilizado membranas de hermeticidad. 

Building candidate in the category

Users’ Choice

Users’ Choice

Green Solutions Awards 2022-2023
 Green Solutions Awards Green Solutions Awards 2022 2023

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