What are Net Zero Energy refurbishments?


A Net Zero Energy house generates as much energy as is needed for heating, hot water and household appliances. An Energiesprong renovation, supported by the Transition Zero project, is usually completed within one week without the residents needing to move out and the solution comes with a 30-year warranty on both the indoor climate and the energy performance. The renovation is paid for by the money that would normally be spent on energy bills. So the residents get a better, more comfortable house without any additional monthly costs.


Net Zero Energy Homes are desirable and fun


Energiesprong works because it delivers results while being an attractive offer for industry, housing providers and residents. Unlike existing retrofit models, Energiesprong uses an energy performance contract to guarantee the performance of the improvements over a long-term (typically 30-year) period. This provides financial security for the property owner as they know that it will perform at the expected level. The extra risk to the contractor is made viable by the guaranteed volume of properties that are delivered through the programme. A procurement approach based on outcomes, available investment and defined energy parameters encourages suppliers to design and engineer completely new solutions with their supply chains. Transition Zero will ensure that the resulting innovation drives down the cost of the solution.



The Energiesprong model is a radical transformation – both practically and conceptually – as it focuses on creating a volume market for solutions that satisfy four key criteria:

1. Guaranteed performance for 30 years. This ensures that the quality of the product (with high indoor climate and energy performance standards) is locked in and guaranteed.

2. Hassle-free, one-week implementation. This means that there is no need for residents to move out during the refurbishment.

3. Affordability. The investment is paid for by the reduced maintenance, resulting energy cost savings and increased value of the property.

4. Attractiveness. Quality design makes Energiesprong properties a fun, lifestyle choice, providing upgraded properties that occupants aspire to. What’s more, they help to regenerate and improve the local neighbourhood.

Who needs to do what?


Making net zero energy refurbishments happen is about changing the whole game for the building and housing sectors. And to achieve this move, everybody needs to play.

Housing providers

They own the houses and thus need to have an active role in the net energy refurbishments. Housing providers have to change their usual way to run tenders, setting very ambitious specifications and running open tenders to allow solution providers to innovate. Accompanying tenants and helping them run their new houses in an efficient way will also contribute to the net zero energy performance

Construction companies

Innovation is at the heart of what the construction companies need to achieve. They will lead consortiums bringing together different skills of the building sector (maintenance, monitoring, energy production, technology supply, etc.). They will invent new prefabricated parts allowing high quality and very fast assembly. Innovation regarding their business model is also needed since they will have to sell works (refurbishment) along with services (maintenance) with a 30-year (or more) guaranteed performance.

Supply industry

Moving to a business model based on the total cost of ownership (TCO) over 30 years or more, construction companies demand will also move to products and technology optimizing this TCO instead of the investment cost only. Suppliers will have to procure efficient and reliable products designed to optimize their maintenance.

Financial institutions

A 30 years guarantee means new financial opportunities with low risk on a very long-term. A monthly amount of money equivalent to the previous energy bill (called “energy fee”) could payback the refurbishment price on such an important period.

Policy makers

New products and services on the market will probably need new rules to make them feasible in a controlled context. Policy makers will have to drive this change if they want to achieve national ambitious energy efficiency goals.