Part O Overheating Calculations aim to mitigate the growing threat of overheating faced by dwellings in the United Kingdom – a growing concern due to the effects of climate change. This issue has profound implications for the well-being and health of inhabitants.

Taking affect in June 2022, Part O of the Building Regulations requires assessments to limit solar gain and ensure efficient heat removal from indoor environments. This protects occupant well being and reduces energy consumption. Approved document Part O 2021 mandates that rooms in a dwelling are evaluated in isolation instead of the previously used dwelling average.

Upon the design and construction of a dwelling an overheating assessment needs to be conducted to ensure that the building design, glazing design and materials selection does not contribute towards increasing the overheating risk of a dwelling. 

We offer both the simplified method and dynamic thermal modelling overheating assessment services. Find more detail on both assessment types here.

Why work with us?

Experience

Our sustainability consultants have extensive experience in meeting regulatory requirements, yet work hard to go beyond mere compliance with the building regulations.

We pride ourselves on delivering decarbonisation advice to help our clients build lower carbon, energy-efficient properties.

Quality

We reduce the amount of assumed data in each calculation to the bare minimum, meaning that our overglazing calculations are as accurate as possible.

Conversations with clients are key to this process and our work improves each time we work on a new project, thanks to the collaborative approach we adopt with our clients.

Speed

Our office-based staff work hard to book all appointments as quickly as the delivery schedule allows.

We work on a two-week schedule, with the vast majority of overheating calculations being delivered well within that window.

Pricing

Our rate card prices for all services are reviewed regularly, so we’re confident that you won’t find a better service for a better price anywhere else. If you think you’ve found one, we’ll either beat or match it.

Support

Navigating the complexity of energy efficiency, decarbonisation, and building regulation updates isn’t easy.

We’ve worked hard to explain a range of topics related to Part O overheating in plain English to help non-experts get the information they need.

Get Your Part O Overheating Calculations Quote Today

Looking for fast and reliable Part O overheating calculations in Bristol or nationwide?

Contact us today for a free quote or to discuss your specific project requirements. We offer competitive rates and prioritise fast turnaround times for all our clients.

Building Energy Experts produced a Sustainability & Energy Statement to support our planning application for 20 homes in Engine Common. They worked with our technical team to identify measures that would help energy savings across the development reduce residual carbon emissions. Despite the technical nature of the topic, the report was clear and concise and well received by the Council’s climate officers. I would happily recommend the team to other developers.

Ashley Grant, Planning Manager at Cotswold Homes – Sustainability & Energy Statement

My house is drafty and hard to heat, it is difficult to get it above 17-18 degrees on cold days even if the central heating has been on for quite awhile. The team at Building Energy Experts were very professional, explained what they were doing as they went along. The assessment was very useful, they have identified areas of air leakage etc and quick wins I can make. It has helped me prioritise my budget. I would definitely recommend using Building Experts.

David Butler, Homeowner – Retrofit West Advanced Air Tightness Test & Thermal Imaging

Dragonfly Power (a not-for-profit community energy group) work with local businesses, schools and other community organisations to increase the uptake of renewable energy. We appointed Building Energy Experts to do a number of energy assessments for local community halls. Their reports were thorough and they were structured in such a way that the hall owners could see the “cheap wins” and which measures would take more investment. Furthermore, the reports have formed the basis for a number of successful grant applications for the refurbishment of the buildings including the installation of solar panels, batteries and heat pumps. This has been a very successful arrangement and we look forward to working with BEE in the future.

Anton Page, Dragonfly Power – Commercial Energy Surveys & Commercial EPCs

Friendly, on time and technically proficient.

Andrew Crawford, Homeowner – retrofit West Advanced Air Tightness Test

The service you provided was very helpful in informing our understanding of the building and the design stage, with good communication and availability for follow-up queries following receipt of your report.

Hilary Kolinsky, Studio Skein – PAS 2038 Assessment, Testing & Commercial EPC

Building Energy Experts provided invaluable guidance on our journey to reduce our environmental impact. Their comprehensive survey quickly identified key areas where we were losing energy and helped us prioritise the most cost-effective solutions. With their support, we’re now able to make informed decisions about our energy upgrades and are well on our way to achieving our sustainability goals.


The Green Impact Team, Horfield Health Centre – Commercial Energy Survey & Testing

Simplified Method

This overheating calculations method provides an initial assessment of overheating risk. It’s ideal for straightforward projects and helps identify potential issues early on, helping you to comply with Part O.

Dynamic Thermal Modelling

For complex projects, those requiring a more in-depth analysis and projects which have failed simplified overheating calculations, we recommend TM59 assessments. This advanced dynamic thermal modelling method provides a comprehensive evaluation of overheating risk using sophisticated software simulations.

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