Fire Risk Assessments
In the realm of workplace safety, fire risk assessment stands apart as a targeted approach exclusively addressing ...
Part O – Overheating Assessments
TM59 & TM52 Overheating Risk Assessments: Ensuring Comfort and Compliance in UK Buildings
Our overheating assessments ensure your building meets Part O of the Building Regulations and provides a comfortable, healthy environment year-round. Using TM59 for new residential developments and TM52 for existing commercial buildings, we identify overheating risks early and recommend effective solutions to keep indoor temperatures safe and compliant.
Quick Quote Request
If you would prefer us to call you back today about your quote, please send us a short message using the form below or email enquiries@focus360energy.co.uk
Why Overheating Matters
Overheating occurs when internal temperatures rise to uncomfortable or unsafe levels, often due to:
- Solar gain – Excessive sunlight through glazing
- Internal heat gains – From occupants, appliances, and lighting
- Inadequate ventilation – Poor airflow trapping heat
- Urban heat island effect – Higher temperatures in built-up areas
Risks of overheating include:
- Discomfort, reduced productivity, and disturbed sleep
- Health impacts for vulnerable occupants
- Potential building fabric damage
- Regulatory non-compliance – Part O requires all new residential buildings in England to be designed and built to limit overheating
Part O – Overheating Assessments:
Frequently combined with the following additional services:
SAP Calculation - New Build
SBEM calculations
Energy Statement
Energy Statement - London Plan
Air Pressure Testing
Flood Risk Assessment
BREEAM Assessment
Water Consumption Calculation (Part G)
If you need assistance ...
Hi, I'm Will, the Customer Relationship Manager, and I oversee every aspect of your customer journey. If you need any further assistance, please get in touch.
Get your online quote
Ready to get started, get your quote today
Contact Focus 360 Energy today for a comprehensive Part-O Overheating quote. Our easy-to-use online system makes it easy to schedule an assessment and manage your job from start to finish.
Download our New Build & Conversion Services Guide
We’ve created a user-friendly guide covering the various services you’ll need at each stage of your project.
TM59 Overheating Assessment for New Residential Buildings
CIBSE TM59 overheating risk assessment is the industry-standard method for evaluating overheating risk in new homes and complex residential projects. It uses dynamic thermal modelling to analyse:
- Building orientation and exposure to sunlight
- Thermal properties of walls, roofs, floors, and windows
- Ventilation type and performance (natural and mechanical)
- Internal heat gains from people, appliances, and lighting
- Shading devices and their effectiveness
- Local weather data (temperature, humidity, solar radiation)
A TM59 overheating risk assessment allows us to:
- Identify and address areas most at risk
- Recommend design changes to reduce overheating
- Demonstrate full compliance with Part O Overheating Assessment requirements
- Enhance occupant comfort and property value
Find out more about CIBSE TM59 Assessments for Domestic Properties
TM52 Overheating Assessment for Existing Commercial Buildings
Overheating is not limited to new builds. CIBSE TM52 assessments are designed for assessing and reducing overheating risk in existing commercial properties, especially those with older construction or large glazed areas.
Key features of TM52 assessments:
- Detailed building analysis – Thermal performance, ventilation, occupancy patterns
- Realistic modelling – Simulates real-world weather and usage
- Tailored recommendations – Ventilation upgrades, shading, insulation improvements, or cooling solutions
- Comfort and productivity benefits – Happier, healthier occupants
- Energy efficiency gains – Opportunities to reduce energy use and costs
Compliance support – Meets regulatory or green building certification requirements where applicable
Why Choose Focus 360 Energy for Your Overheating Risk Assessment?
- Accredited overheating assessors experienced in TM59 and TM52
- Solutions tailored to your building’s design, use, and budget
- Integrated compliance services, including SAP calculations, SBEM calculations, BREEAM assessments and air pressure testing.
- Early risk mitigation to save time and costs
- Proven track record of delivering Part O overheating assessments that pass first time
Take the First Step Towards Compliance and Comfort
Don’t let overheating risk compromise your project. Contact Focus 360 Energy today for a building regulations overheating risk assessment and ensure your design is safe, compliant, and comfortable for all occupants.
Frequently Asked Questions
How do I comply with Part O building regulations?
Does Part O apply to extensions and conservatories?
Where can I find detailed information on Approved Document O: Overheating?
Compliance Case Studies
Discover our client success stories for domestic and commercial businesses needing compliance support.
Related Content
How Much Does An EPC Certificate Cost?
When it comes to selling or renting a property, having an Energy Performance Certificate (EPC) is a legal ...
BREEAM Certification: Everything You Need to Know
As concerns about climate change and the environment continue to grow, there has been a significant increase in ...
No results found.
Save up to 50% compared to architects
Services available nationwide. Fast-Track available.
Approved accredited assessors
Client Portal System - manage your job on the go