SAP CalculationsSAP Assessments & EPCs

Find out how Vision Energy can take care of all your compliance needs for your new Build Project

Find out more about SAP Calculations

Conversion SAP CalculationsSAP Assessments & EPCs

Vision Energy can take care of your energy assessments for your conversion project, find out more today

Find out more about Conversion SAP Calculations

Extension SAP CalculationsSAP Assessments & EPCs

All Extensions with 25% or more glazing compared to the floor area require SAP & EPC assessment and calculations, find out more

Find out more about Extension SAP Calculations

Overheating Analysis for Residential & Commercial Developments

During the design of your project, it is important to ensure that not only the dwelling is insulated well but also does not overheat across the year. Overheating analysis may be required to design around non-compliance overheating issues, as part of planning permission or as part of an energy statement.

Overheating Analysis

When designing a project, it is important to ensure overheating is not an issue across the whole year, this is to provide a good level of thermal comfort as well as limit the need for additional cooling where required. High temperatures in buildings on the very bottom line is not a comfortable environment to live or work. Therefore completing an Overheating analysis can avoid this.


CIBSE has produced guidance in the form of TM52, TM59 and Guide A, these guidelines set out the criteria to ensure that overheating within a building is not present. The different guidance covers commercial and residential and if the building is cooled, naturally ventilated and mechanically ventilated to be certain the correct criteria is set for the building type and design.


In designing your project to eliminate overheating risk, we would use thermal modelling techniques that take into consideration schedules, equipment, people and solar gains as well as the thermal performance of the project to be able to design a natural or mechanical ventilation strategy to reduce the risk of overheating. This may be just part of your design process or this could be as part of a planning condition, Energy statement or based on a failure for overheating within Part L calculations.


What Next?

We have produced overheating analysis for a huge variety of projects and would be more than happy to assist you with your requirements, feel free to get in touch with one of our consultants and we will be able to advice further.

Get The
Latest News

HIRING: Sustainability Consultant (Building Physics) Role

Posted14th November 2023

Continue Reading

Meeting The London Plan Energy Statement Requirements: A Guide to Planning Compliance

Posted12th September 2023

Continue Reading

Understanding PSI Values

Posted12th June 2023

Continue Reading

Sustainability & Building Compliance

Vision Energy are a leading Sustainability & Energy consultancy working nationwide. We specialise in calculations & reports covering Building Regulations, Planning Permission and all other sustainability or energy needs within the construction sector. With a vast amount of knowledge and experience having worked on thousands of projects across the UK one of our engineers would be more than happy to assist you on your project. SAP Calculations | SBEM Calculations | Energy Statements | BREEAM Pre-Assessments | M&E Design | EPC's | Water Efficiency | Air Permeability

Talk to Our Technical Team

Get a Quick Quote

Highlighted Work

Colchester Institute – Winter Conditions & Condensation Assessment

Vision Energy were commissioned in 2021 to undertake an assessment in conjunction with fabric and mechanical upgrades to multiple blocks on the campus. The works consisted of external wall...

Continue Reading

Barnwell Lake Cafe

The proposed project consists of a café and bike workshop located on the land off Newmarket Road near Barnwell Lake, the café is to be a cycle-themed café across a single storey building. The...

Continue Reading

Frequently Asked Questions

A number of guides and standards are available for the assessment of overheating in buildings. CIBSE guides TM59 covers overheating in residential buildings. CIBSE TM52 covers overheating in commercial buildings. BB101 covers overheating in educational buildings.

Overheating assessments will cover a number of weather scenarios specifically to the location of the building/development. both current and future weather will be considered as well as different weather patterns such as;

  • A Moderately Warm Summer (DSY1)
  • A Summer with a short intense warm spell (DSY2)
  • A summer with a long less intense warm spell (DSY1)

A number of factors can impact the internal temperatures of a building but below are a few key factors

  • Solar Gains
  • Ventilation rates & Strategy
  • Internal gains (people, equipment, plant, lighting)
  • Internal plant (heat-generating plant i.e. DHW storage)

All of the above can contribute to a building overheating as they will raise the internal temperatures unless correctly designed and considered.

Each overheating assessment is unique to the development so the route to limit overheating is different for each assessment. however, the below outlines some mitigation strategies against overheating;

  • Architectural/local shading
  • Robust natural ventilation strategy
  • solar control glazing
  • building layout & orientation designed to reduce solar gains/increased temperatures in sensitive areas
  • Building fabric design, specifically thermal mass for the ability for heat to be dispersed/retained within the building structure.
  • Mechanical cooling

Overheating assessments are bespoke to each project/building so the pricing is not fixed, however, the cost can vary between £250 to £1000+.  If you would like an accurate fee for your overheating assessment get in touch with our team.