What Is Retrofit

Retrofit is a form of renovation, typically undertaken to greatly reduce energy consumption. As such, retrofit involves a significant improvement in the thermal performance and comfort of your home. More specifically, it is about improving the building fabric rather than simply the introduction of renewables.

The challenge is that it is difficult to know how far to go and predict how much comfort and performance your retrofit measures will deliver. To this end, you need something to measure against and compare performance with known benchmarks.

The Passivhaus standard is perhaps the best known of the energy efficiency fabric standards for new builds, and the good news is that this standard has been adapted for existing homes, too. 


What Is EnerPHit

In the case of refurbishments of existing buildings, it is not always possible to fully achieve the Passive House Standard with reasonable effort. The reasons for this lie e.g. in the unavoidable thermal bridges due to existing basement walls. For such buildings, the Passive House Institute has developed the EnerPHit Standard. With the use of Passive House components, EnerPHit retrofitted buildings offer almost all the advantages of a Passive House building with optimum cost-effectiveness at the same time:

• Comfortable living with uniformly warm walls, floors and windows
• Draughts, condensation and mould growth are no longer a problem
• Permanent supply of fresh air with a pleasant temperature
• Independence from energy price fluctuations
• Financial profits from the very first year on due to up to 90 % reduced heating costs
• Climate protection due to decreased CO2 emissions of the same scale


What is AECB Building Standard

The AECB Building Standard is aimed at those wishing to create high-performance buildings using widely available technology at little or no extra cost. We estimate that this low-risk option will reduce overall CO2 emissions by 70% compared to the UK average for buildings of each type – a highly significant result given the relative ease and low cost with which this standard can be met. Individual self-builders and large-scale residential and non-residential developers could make a valuable contribution to low-carbon building by meeting the AECB Building Standard.

What is PAS 2035

Due to the complexities of a retrofit their have been several high profile failures under government schemes.

PAS 2035 is the new British Standard and over-arching document in the retrofit standards framework, with which holders of the Quality Mark will be required to comply when carrying out domestic retrofit work. This standard incorporates  PAS PAS 2030 and other retrofit standards as part of the retrofit standards framework.

To be compliant with PAS 2035, retrofits need to have professional designs carried out by a nominated

All retrofits must have an identified and appropriately trained project manager, ‘high risk’ projects must also be overseen by a qualified retrofit co-ordinator.

Installers are responsible for seeking and recording feedback on all installations after completion. Occupants and clients will be asked if the retrofit has met the intended outcomes of the project (as agreed between the project manager and client at the start), and whether they are satisfied. If there is cause for concern, recommendations for action will be made, and if the issue is not resolved, the assessment process can be escalated to include further investigations and interventions.