Prefabricated façade with integrated heat pump and PV panels or solar thermal collector

Building Characteristics

Building type

Type of ownership


Age Class

Cost Benefit Indicators

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Embedded Technologies


• External insulation of facade
• Roof and loft insulation


• New space heating system


• Photovoltaic
• Solar thermal collector

Energy management

• Building Energy Management System

Technology readiness

actual system proven in operational environment (with competitive manufacturing)


This package includes:

  • a prefabricated timber façade
  • a heat pump for centralised heating
  • photovoltaic panels or solar thermal collectors

Prefabricated timber framed façade elements are used for the external thermal insulation of walls. The prefabrication enables the industrialisation of the manufacturing process, and reduce the duration of on-site works. The system also integrates windows and HVAC devices. In this refurbishment package, the prefabricated façade is combined with a heat pump that provides space heating and domestic hot water, and with a ventilation with heat recovery.

Photovolaic panels or solar thermal collector are also installed on the roof.

Design and implementation


  • Precise prefabrication technique off-site and high quality due to a controlledproduction process
  • Integrated solution, with pre-installed windows and HVAC devices
  • Fast mounting process with little disturbance of the inhabitants.
  • No scaffolding required
  • No weather downtime for on-site works
  • Ecological performance with high CO2 storing capacity, better LCA than polystyrene-based ETICS
  • Free scope for façade design


  • Exigent logistics and planning process
  • Thickness of additional layer
  • Treatment of interstices between 2 panels
  • The mounting of prefabricated modules is a new construction process and needs experience to be practised
  • Upfront cost higher than solutions such as ETICS


  • Integration and extensions of additional building elements, such as windows, balconies/loggias, HVAC devices, plumbing, electricity.
  • Integration of active components (photovoltaic and solar thermal)
  • Incentives and subsidies (bonus for ecological materials)
  • Creates regional added value with local sourcing, production and installation


  • Fire regulations in multi-storey buildings > 6 floors
  • Reduced application for historical buildings.

Related Business model

One-stop-shop provided by multi-disciplinary team cooperation

Multidisciplinary team cooperation is a novel model of business where the project is carried out by a multi-disciplinary team in a cooperative manner. The multi-disciplinary team consists of partners with complementary competences, such as achitects and designers, constructors, energy-efficiency experts, market and financial experts, technology suppliers, strategy and operations planners. Starting from the initial design phase, the team works together, in strict collaboration with the building owner, in order to select the most feasible intervention technologies and renovation measures to adopt, planning the whole renovation project according to customers’ needs and desiderata, considering also the costs related to planned works.

The cross-fertilisation of gathering different actors together in an early phase of the renovation project permits to define a holistic approach to the renovation intervention. In this way sustainable and energy–efficient retrofitting solutions and innovative solutions for the life time of the facility can be achieved, with an optimal control over the total costs of the renovation project and guaranteed efficiency performances.

The main idea in this business model is that the same team of consultants representing different design disciplines or expert areas will carry on with the project and produce the holistic design service for the building retrofitting.

The team should be able to give a deeper value promise based on their value proposal in the initial competition stage. Value proposal cover the overall offerings each organisations of the team could produce. Value promise is a part of offerings and tailored for the facility question and it is answering to the targets of the client. Value promise should be in core of the contract with the client and the team. Table below provides the St. Gallen approach for this BM.


Villogia house

Location 38-56 rue Védrines, Hem (France)

Completion : 2017

The pilot site in the rue Vedrines is composed of 10 houses constructed in 1952 with energy label E.

Energy renovation of terraced houses with customised, off-site manufactured walls and roofs, which are pre-fitted with windows and doors.

More information here: