02/03/2026
We can’t believe it’s been three weeks since Guy Martin’s House Without Bills aired. We were delighted to see Park Haus — our client’s retrofit — featured, and for so many valuable lessons from their journey to be shared.
The programme focused on eliminating energy bills, and for some homeowners that is indeed the goal. Achieving this requires a robust methodology, such as the standard.
For others, the aim is different: a more comfortable home that’s easier to heat, with a clear pathway towards a low-carbon heating system in the future.
Whichever goal you’re working towards, the foundation is the same — quality construction and meticulous attention to detail. This ensures your insulation performs as intended and helps you avoid unintended risks.
For anyone planning to improve their home’s energy performance, we recommend the following steps:
1. Find an independent Retrofit Designer*
Choose someone you trust and feel comfortable working with. (Retrofit Designers may be architects or retrofit specialists — try looking for someone who talks to you about your space heating demand and not your EPC rating. Most importantly, they should be independent, with no products to sell.)
2. Retrofit Assessment
The scope will depend on the scale of works you’re considering and your available budget. For whole-house retrofits this should include a comprehensive condition survey.
3. Consider energy modelling
PHPP modelling can be a powerful design tool when deciding where and how to invest your budget most effectively. We recommend it where it will genuinely support informed decision-making. If you’re aiming for , , or the CarbonLite standards, PHPP modelling is essential to quantify energy savings for certification.
4. Retrofit Strategy or Plan
This should set out a clear route to your end goal. It might be a high-level phased plan with a step-by-step approach, or a more detailed roadmap if you’re ready to progress the full project. Either way, it should demonstrate how the elements of your retrofit work together and guide you towards the right first steps.
Build
Photos
Passivhaus Trust