Renovation Hub: The collaborative platform for the energy-efficient renovation of buildings

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Latest Publications

Read the latest published articles presenting a new refurbishment package, business model or case study. You want to submit your own article? Please join the STUNNING stakeholder community!

Enhanced Energy Performance Contracting

The Enhanced Energy Performance Contracting (EPC) model, proposed by NOVICE project, consists to generate revenues from Energy Savings, as in the classic EPC model, but also to generate revenues from Demand Response Services.

Demand response is a way of shifting or reducing electricity usage during peak periods. Indeed, when electricity demand exceeds supply on the grid, clients’ electrical asset consumption can be adjusted by using aggregator technology. Thanks to this shift, power returns to the grid and the supply and demand balance is restored in a cost effective and green way. Also, the clients earn revenues simply for participating and being available.

In the Enhanced EPC model, the ESCOs remain the single point of contact for all measures but uses the services of a demand response aggregator to provide services to the grid. A Memorandum of Understanding (MoU) governs the relationship between ESCO and Aggregator.

Market readiness for Enhanced EPC is varying across European countries. Some of them, like France or UK, have well developed or growing ESCO markets and several open DR markets with regulation that encourages aggregators to participate. Other countries (Belgium, Germany, Finland…) have either an advanced ESCO or an open DR market but strict regulations that limit the ability of aggregators to participate. Finally, some EU countries like Italy or Spain have immature ESCO and closed DR markets (or do not legally allow aggregation).

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Hem district

Energiesprong is a new refurbishment standard originated in the Netherlands to massify high-performance energy refurbishments, starting with the social housing stock. The principle: long term guaranteed net zero energy and high quality and comfort refurbishment (up to 30 years), with a minimum disruption for tenants thanks to the off-site construction of large components, and an overtinvesment being financed by the money saved on energy bills and maintenance.

Highly insulated walls, roofs with integrated solar panels and other large components are made off-site, which allows whole-house retrofits to be done quickly and with minimum disruption to tenants. Real-life performance for energy use and indoor comfort is guaranteed for up to 30 years.

Within the E=0 project, funded by Interreg North-West Europe, Vilogia, a social housing association, tested the EnergieSprong approach for the first time in France on 10 individual houses in Hem (59) to demonstrate the replicability of the project. These houses are typical northern brick houses with two floors and four rooms built in 1952, with an initial energy performance of E. This first French refurbishment comes with a 25-years performance warranty on the energy performance.

The retrofit was non-intrusive (pre-fabricated facades, new roof with solar panels, new installations e.g. floor and heating plant), esthetic and completed within six weeks, and without the resident needing to move out. Moreover, tenants also enjoy new refurbished kitchen and bathroom, and will have access to a monitoring device and coaching to master their energy consumption. In this case, the total consumption after work is of 74 kWh/m²/y and the renewable energy production of 75 kWh/m²/y, leading to a final energy consumption of -1 KWh/m²/an.

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GAP Solutions

The GAP solutions is a complete solution developed around three core business, GAP Engineering, Gap systems and GAP Services.

GAP1 engineering

GAP1 engineering stands for close collaboration of architects, planners and executors as well as for the careful coordination of building-physical and energetic conditions. GAP engineers are the competent interlocutors that accompanies the client through all realization phases, from conception to implementation. This combination ensures integrated processes and smooth work flows. Based on a comprehensive collection of facts, an energy-optimized construction and management concept are developed in order to be implemented precisely and efficiently. In doing so, solid craftsmanship is combined with industrial production and the special GAP system.

GAP2 Systems

The intelligent GAP facade solutions practically don’t allow any heat loss – the interaction of light, wood and air eliminate thermal bridges and increases the hygrothermal and acoustic comfort. The GAP system has been developed in collaboration with leading universities and research institutions and extensively tested.

The optimized house envelope also allows for optimization of the house technology. Simple and decentralized systems are cost effective in investment and maintenance. The coordinated complete system consisting of facade and building technology sets economical and ecological standards. Based on the interaction of the components, GAP2 systems focuses on sustainability and renewable energy.

  • GAP Skin

The building is enclosed by a tempered air cushion – This buffer zone is a climate regulator and ensures a pleasant room climate during all seasons.

First grade materials ensure long-term quality. GAP glass facades are durable and weatherproof, allowing a drastical reduction of maintenance and operating costs. The evenly warm facade, which is also open to vapour diffusion, ensures mould-free rooms and balances out thermal faults in the building envelope. It is composed as follows:

  • Wood construction + insulating material : ≥ 60 mm
  • Framework wall in solid wood+ insulating material : 151 mm
  • Wood panel (DFP): 19 mm
  • GAP-Honeycomb panel in cellulose. 30 mm
  • Air gap (slightly ventilated): 29 mm
  • ESG float glass panel: 6 mm
  • Attaching parts in aluminium


  • GAP Air

GAP Air is a decentralized ventilmation system based on heat recovery. The ventilation element is embedded in the facade; customized object solutions are also provided. The cost benefit compared with central systems is up to 60% depending on the construction. Independent of central building technology, hygienic and easy to service, they require no regulation expenditure.


  • GAP water

Based on individual project requirements, GAP:water offers customized solutions for hot-water generation and heat recovery. The main principle is the prevention of energy loss. The supply is provided by the facade, at maximum decentralization. GAP:water uses existing waste water heat and focuses on eliminating long lines resulting in heat loss. Based on individual requirements, concrete storage absorbers, loss-free hot-water distribution, heat recovery and photovoltaic are combined.

Maintenance-free and requires no regulation expenditure.


GAP3 Services

Finally, the implementation of the solutions, including installation – and throughout the entire utilization cycle is ensured. Production, machines and installation are provided. Industrial production and installations guarantee efficiency, precision and safety of systems and operations.

Source ©GAP Solutions GmbH

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 STUNNING project

The project STUNNING aims at building up a stakeholder community around a Renovation Hub designed as a knowledge sharing platform, providing information on innovative solutions for building renovation and novel business models (illustrated through case studies) for their adoption and large scale replication. The provided solutions involve affordable and adaptable refurbishment packages, taking into consideration the whole renovation value chain.

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