||This project looked at designing a supply chain solution to improve the energy efficiency of the vast majority of the 26 million UK homes which will still be in use by 2050.It looked to identify ways in which the refurbishment and retrofitting of existing residential properties can be accelerated by industrialising the processes of design, supply and implementation, while stimulating demand from householders by exploiting additional opportunities that come with extensive building refurbishment.The project developed a top-to-bottom process, using a method of analysing the most cost-effective package of measures suitable for a particular property, through to how these will be installed with the minimum disruption to the householder. This includes identifying the skills required of the people on the ground as well as the optimum material distribution networks to supply them with exactly what is required and when.
This deliverable is number 5 of 8 in Work Package 4. The report builds on the previous Target Retrofit Supply Chain Scenarios report (WP4.3) to presents detailed plans for delivery of mass-scale whole house retrofit. This covers the survey and installation processes, the cost of retrofitting the most common property types in the UK and how cost is built up. In addition a market take up hypothesis has been generated based on which customer segments will take up retrofit first; this allowed an estimate of regional coverage for retrofit capacity (manpower, materials and competencies) to be made. This has been dependent on the building stock modelling functionality developed in Work Package 2 of the project.
- The 4 hour detailed survey with 2 people is possible (even for the most difficult house) and there is scope to reducethis further.
- It has been shown to be possible to retrofit the two levels of intervention, Retro Fix and Retro Plus, across the modelled house types in 10 elapsed days or less (depending on property size/ complexity and weather permitting) using a team of 4 poly-competent retrofitters.
- Increasing competencies will be vital to deliver retrofit brilliantly and at scale - new training systems are required to provide an up-skilling route for people wishing to enter the retrofit industry.
- New or simplified accreditation and warranty systems are needed for retrofit
- Standard retrofit solutions will help generate efficiency gains and simplify the provision of materials.
- Progress has been made to understand how cost is built up within the supply chain but further work is needed to allow key players to share cost information.
- Retrofit cost of under£10,000 for most house types is feasible but challenging for most house types based on our understanding of how cost is built up within the supply chain. More specific cost data will be generated for common house archetypes; these will be presented in follow up reports for this work package.