The Importance of PAS 2035

PAS 2035 is a standard for retrofit assessments, which are essential for ensuring that retrofit projects are carried out safely and effectively. It sets out clear guidelines for assessors, ensuring consistency and quality in the retrofit process. By following PAS 2035, homeowners and building owners can be confident that their retrofit project will be completed to a high standard, delivering the expected energy savings and improvements in comfort.

Why Retrofit Matters

The UK faces a significant challenge with regards to energy-inefficient homes.

Challenges of Retrofit Assessments

There are a number of challenges associated with the retrofit assessment stage:

Our Approach to Retrofit Assessments

At Building Energy Experts we are passionate about driving sustainability in the construction industry, and retrofit assessments are a key area of our expertise. While we originally focused on sustainability consulting and testing services like air testing, Part F, thermography, and SAP assessments predominantly for new builds, the introduction of PAS 2035 presented an exciting opportunity to expand our services into the crucial realm of retrofit assessments. We believe in a holistic approach to retrofitting, recognising the value of comprehensive data collection to inform the most effective solutions.

This is why we go beyond the standard PAS 2035 assessment by offering a range of additional services during the same visit:

By combining these services, we can often gather all the additional information a client might need in a single, efficient appointment. This not only saves time and resources but also ensures a more comprehensive understanding of the property’s condition and retrofit needs. It also removes the need to rely on assumptions throughout the retrofit process.

Recognising the need for efficient data management, we developed a bespoke reporting system and later transformed it into a data collection app. This innovative app streamlines the assessment process, allowing our team to gather data quickly and accurately while ensuring no crucial information is missed. This commitment to innovation and efficiency is what led to Jack Hannon being awarded Retrofit Assessor of the Year 2023.

We are confident that our holistic approach, combined with innovative tools and expertise, positions us as a valuable partner in delivering high-quality, efficient, and safe retrofit projects.


To optimise costs, we conduct full-scope testing for archetype assessments. This involves:

Utilising archetyping allows the retrofit designer to develop cohesive design packages for each archetype, streamlining the process and improving efficiency. A Retrofit Assessment is still required for each dwelling to account for variations within the archetype group.

Grouping dwellings through archetyping allows for:

By minimising individual assessments, we minimise disruption to residents, crucial for project success

PAS 2038 Expertise

While our primary focus is on PAS 2035 domestic projects, we also have expertise in the commercial sector.

We are one of the few companies with experience conducting multiple PAS 2038 commercial retrofit assessments, demonstrating our commitment to staying at the forefront of the industry.

Industry Trends

The retrofit industry is constantly evolving, and there are a number of key trends and considerations that are worth noting:

Future Outlook

The future of the retrofit industry is uncertain, but there are a number of things that need to be considered:

These measures combined seek to enhance resident engagement, education and the successful implementation of energy efficiency measures in retrofit projects going forward.

Inspiring Day at Futurebuild 2024!

I had an incredible time at The National Retrofit Conference, where I had the privilege of presenting and participating in a thought-provoking panel discussion.

Sharing insights on not necessarily Speeding up, but Scaling up PAS 2035 Retrofit was truly fulfilling, and engaging with fellow industry experts during the panel discussion added valuable perspectives to the conversation.

Grateful for the opportunity to contribute to the knowledge exchange at Futurebuild and connect with so many passionate professionals in the retrofit sector.

A big shout-out to The Retrofit Academy CIC and my fellow panellists for making it a memorable experience and congratulations to all the winners of this year’s awards!

Looking forward to more opportunities for collaborative learning and growth in the future.

Jack Hannon, Head of Operations & Retrofit

The retrofit industry is rapidly evolving, and we consider ourselves to be at the forefront, offering a comprehensive and efficient approach to retrofit assessments. We are committed to providing high-quality services that ensure the success of your retrofit project, from initial assessment to completion.

If you are considering a retrofit project, get in touch today to discuss your options and learn how we can help you achieve your energy efficiency goals.

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