The UK retrofit industry has long faced significant challenges, primarily due to its fragmented nature. Individual companies often deliver separate retrofit measures under different schemes, resulting in a lack of coordination. This “single measures” approach means projects frequently address only one element at a time without considering the whole dwelling, which can lead to inefficiencies and missed opportunities for maximising energy efficiency.
Thermal bridging and thermal bypass—occurring where different building elements (e.g., floors, walls, windows) meet—are common issues that compromise performance and energy savings.
Not to mention the inevitable delays, miscommunications and time and money spent coordinating different installation teams! We have been involved with retrofitting hundreds of properties and wanted to share our perspective and suggestions for organisations like housing associations and local authorities considering retrofitting their housing stock, to make sure that the process runs seamlessly.
Whole House Retrofit vs. Single Measures
Whole dwelling retrofit, also known as whole house retrofit, is usually considered the preferred approach by experts and risk management professionals. It involves considering the entire building as a cohesive system rather than focusing on individual measures. However, due to the realities of funding constraints, government programs often still promote the single measures approach, leading to problems at the junctions and edges where different parts of the building meet. Integration of building fabric and services is crucial to ensure energy efficiency and minimise energy loss. Unfortunately, retrofitting an entire property to meet 2050 net-zero standards in one go is often financially challenging for most property owners and landlords, so single measures become a ‘better than nothing’ solution.
Staged Retrofit Approach
The PAS2035 standards address these challenges by introducing a process for staged retrofitting. Homeowners assess their current building condition, determine their 2050 goals, and implement a phased plan for retrofit improvements. This staged process allows homeowners to make incremental, affordable improvements over time, rather than attempting an expensive, all-at-once retrofit. Typically, three to four stages are sufficient to achieve long-term retrofit goals without breaking the process into too many smaller, disjointed steps.
For example, consider a social housing property—a typical 1960s-built terraced house managed by a housing association. Initially, the property undergoes an assessment to identify key areas for improvement, such as wall insulation, window upgrades, and boiler efficiency. In Stage 1, cavity wall insulation is installed to improve thermal performance, alongside loft insulation to minimise heat loss. Stage 2 involves upgrading the windows to double glazing, significantly reducing drafts and improving comfort. In Stage 3, the old boiler is replaced with an energy-efficient heat pump, further reducing carbon emissions. Finally, Stage 4 adds solar PV panels to generate renewable electricity, helping achieve the 2050 net-zero goal. This phased approach allows the housing association to spread costs over time while ensuring each measure complements the others, ultimately transforming the property into a low-carbon, energy-efficient home.
Industry Culture Shift
Transitioning from individual measures to a coordinated whole dwelling retrofit requires a significant culture shift in the insulation and retrofit industry. Poor retrofits often occur when different contractors install measures one at a time, resulting in disconnected systems that do not work well together and a general lack of accountability and sense of ownership. A successful retrofit requires a coordinated team approach, where multiple measures are implemented simultaneously, ensuring integration and addressing how the measures interact.
Fragmentation in the Insulation Industry
The insulation industry in the UK remains fragmented, with companies specialising in different types of insulation such as external wall insulation (EWI), internal wall insulation (IWI), cavity wall insulation (CWI), and loft insulation. Each type of insulation comes with specific ventilation requirements, which adds complexity to the integration process within a whole dwelling retrofit. To achieve effective retrofitting, it is essential to consider these varying requirements holistically.
This is why we offer the full range of retrofit services, both to give us a broader perspective on each property’s retrofit journey, but also to avoid the ‘to a hammer everything looks like a nail’ mentality of single-measure firms who will always prescribe their preferred measure as the solution, regardless of the problem.
Government Programs and Challenges
Government programs in the UK continue to promote single measures, primarily due to limited funding and a focus on achieving short-term results. The treasury’s emphasis is often on the number of installations completed or the immediate carbon savings, rather than adopting a comprehensive, long-term retrofit strategy. This short-term focus, combined with shifting priorities every few years, makes it difficult to implement effective staged retrofit plans.
We are hoping that the new government will take a broader and more nuanced approach, but time will tell.
Learning from Other Countries: Ireland’s Example
Ireland provides a successful example of addressing similar retrofit challenges by linking funding to a carbon tax and establishing ring-fenced, multi-annual funding mechanisms. Consistent funding allowed Ireland to develop industry skills and foster long-term planning, reducing the stop-start nature of previous schemes.
However, Ireland faced challenges in the early stages, such as a shortage of skilled workers and initial hesitancy from property owners due to unfamiliarity with new technologies. These issues led to delays and some poorly executed retrofits. The UK can learn from these experiences by investing in workforce training from the outset and ensuring effective communication with property owners about the benefits and process of retrofitting. While the UK is slowly moving in this direction, the industry continues to grapple with inconsistent funding and a lack of government commitment to long-term solutions.
Staged Retrofit Planning and Trigger Points
Trigger points—such as changes in family dynamics (e.g., expanding or shrinking household), inheritance, job changes, or moving homes—provide opportunities to integrate retrofit measures into people’s lives. These life events should be incorporated into a coherent long-term plan to ensure that the UK’s housing stock, totaling 27 million homes, reaches net-zero standards by 2050.
Conclusion: Retrofit Planning and Policy Challenges
While the PAS2035 standard emphasises whole dwelling retrofits and staged planning, a disconnect remains between government policy and expert-recommended best practices. Civil service culture and short-term treasury demands prioritise immediate, measurable outcomes, such as installations completed per year, which undermines the push for long-term, staged retrofitting approaches. To achieve the net-zero target by 2050, the UK needs more consistent funding, better long-term planning, and greater industry coordination to deliver effective retrofit solutions.
Want to make your housing projects more efficient, sustainable, and future-ready? Partner with Pyramid Eco’s expert energy retrofit contractors in London. We’ll help you assess your housing stock, plan effective whole-house retrofits, and unlock long-term energy savings while improving residents’ comfort and well-being.
Book your free consultation today and take the next step towards achieving your net-zero and energy performance goals.
