We provide Overheating Assessments for architects, developers, housebuilders and contractors, helping project teams assess overheating risk, identify appropriate mitigation measures and provide the calculations and documentation needed for Building Regulations compliance.
Whether you’re working on a single new dwelling, apartment scheme, supported accommodation or larger residential development, we provide clear, practical overheating assessments as part of the design process.
An Overheating Assessment evaluates whether a new residential building is at risk of becoming excessively hot during warmer periods and helps demonstrate compliance with Building Regulations Part O.
The assessment can consider factors such as:
• Building orientation, location and solar gains
• Window sizes, glazing and shading
• Natural and mechanical ventilation
• Thermal mass, internal heat gains and occupancy
• External temperatures and weather data
Where dynamic thermal modelling is used, the assessment follows the methodology referenced by CIBSE TM59, providing a more detailed analysis of overheating risk.
Overheating can affect occupant comfort, health and the usability of a building, particularly as buildings become more energy efficient.
An Overheating Assessment can help you:
• Demonstrate compliance with Building Regulations Part O
• Identify overheating risks before construction begins
• Optimise glazing, shading and ventilation strategies
• Avoid costly design changes later in the project
• Provide the documentation needed for Building Control
We work with architects, developers, contractors, housebuilders and construction professionals, providing design and build compliance services across residential and commercial projects.
From SAP Calculations and SBEM Assessments to air pressure testing, acoustic testing, ventilation and thermal performance assessments, we provide the technical compliance services your project needs at different stages of design and construction.
With one company and one point of contact, we make it easier to manage multiple compliance requirements from design through to completion, helping your project stay on track and meet applicable Building Regulations.
Overheating Assessments for new residential buildings in England are carried out in accordance with the applicable Building Regulations and Approved Document O.
Our assessments may use:
• Building Regulations 2010 – Part O
• Approved Document O – Overheating
• CIBSE TM59 – Overheating risk in dwellings
• Applicable CIBSE weather data and modelling requirements
Whether you require an Overheating Assessment on its own or alongside other compliance services, we’ll help coordinate the process through one trusted provider, making property compliance simpler to manage.
Our competent surveyors carry out Overheating Assessments across a wide range of commercial and residential properties, ensuring each survey is appropriate for the building and its intended use.
Based in Manchester with a particular focus on Greater Manchester and the wider North West. But our team supports clients across the UK, so wherever your properties are located, we’re ready to help.
Our compliance reports are written in plain English, with clear findings, practical recommendations and documentation that’s ready to use. No unnecessary jargon, just reports that help you act quickly and stay compliant.
From your first enquiry to your final report and beyond, we’re committed to clear communication, prompt responses and proactive recommendations and reminders to help you stay compliant without the stress.
We coordinate your compliance services in one place, reducing administration, saving time and making property compliance easier to manage, so you can focus on supporting your residents.
Working with the Compliance Company is always great, they produce their work in a timely and professional manner.
Communication is always top notch too, which is really appreciated. They are our go to consultants for anything Part L or SBEM related.
Very happy with their prompt noise survey and report. All done smoothly and within the timescales communicated during quotation. Highly recommended!
Ryan was exceedingly helpful. A wealth of guidance, advice, and wisdom. Very personable, professional, and honest. He answered all my questions promptly and thoroughly.
It’s very refreshing when you don’t have to chase people! Really cannot recommend Ryan enough. He and his business are top-notch
We provide Overheating Assessments (Part O) across the UK, supporting commercial property owners, landlords, housing providers, managing agents, contractors and organisations responsible for maintaining safe, compliant buildings.
Our surveyors regularly work across:
• Greater Manchester (Manchester, Salford, Bolton, Stockport, Oldham, Rochdale, Bury, Tameside, Trafford, Wigan)
• Merseyside (Liverpool, Wirral, St Helens, Southport, Knowsley, Sefton)
• Cheshire (Chester, Warrington, Crewe, Macclesfield, Northwich, Ellesmere Port, Wilmslow)
• Lancashire (Preston, Blackburn, Blackpool, Burnley, Accrington, Rossendale, Chorley, Lancaster)
• West Yorkshire (Leeds, Bradford, Wakefield, Huddersfield, Halifax, Dewsbury, Batley)
• South Yorkshire (Sheffield, Doncaster, Rotherham, Barnsley)
• North Yorkshire (York, Harrogate, Scarborough, Ripon, Selby, Skipton)
• East Midlands (Derby, Nottingham, Leicester, Derbyshire, Nottinghamshire, Leicestershire)
• Staffordshire (Stoke-on-Trent, Stafford, Tamworth, Newcastle-under-Lyme, Burton upon Trent)
• West Midlands (Birmingham, Coventry, Wolverhampton, Solihull, Walsall, Dudley, Sandwell)
• North East (Newcastle, Sunderland, Gateshead, Middlesbrough, Darlington, Durham)
• East Anglia (Cambridge, Norwich, Ipswich, Peterborough)
• Greater London (Central, North, South, East, West London)
• Kent (Maidstone, Canterbury, Medway, Ashford, Dartford, Tunbridge Wells)
• Surrey (Guildford, Woking, Reigate, Epsom, Redhill)
• Essex (Chelmsford, Colchester, Basildon, Southend-on-Sea, Harlow)
• South Coast (Hampshire, Sussex, Portsmouth, Southampton, Brighton, Eastbourne)
• South West (Bristol, Devon, Cornwall, Somerset, Gloucestershire, Plymouth, Exeter, Bath, Gloucester, Cheltenham, Taunton)
• South Wales (Cardiff, Newport, Swansea, Bridgend, Merthyr Tydfil)
• Scotland (Glasgow, Edinburgh, Aberdeen, Dundee, Stirling, Perth)
Part O applies to new residential buildings in England and requires measures to limit the risk of overheating. Compliance can generally be demonstrated using either the simplified method or the dynamic thermal modelling method set out in Approved Document O.
Part O applies to new residential buildings in England. This can include new houses, flats and other residential buildings within the scope of the Building Regulations.
Part O does not generally apply to extensions or buildings undergoing a change of use. The exact application should be considered based on the scope and circumstances of the project.
The simplified method uses defined criteria to assess overheating risk based on factors such as glazing, orientation and ventilation.
Dynamic thermal modelling provides a more detailed assessment by modelling how the building responds to changing internal and external conditions over time. It can be used where the simplified method is not appropriate or where a more detailed assessment is required.
The assessment should be considered early in the design process, before key elements such as glazing, shading and ventilation strategies are finalised.
Identifying overheating risks early makes it easier to incorporate mitigation measures without causing expensive or disruptive changes later in the project.
We typically need architectural drawings together with information about the building’s location, orientation, glazing, shading, ventilation, construction, occupancy and other relevant design details.
The exact information required will depend on the assessment method and the stage of the project.
We can identify the factors contributing to the overheating risk and recommend potential mitigation measures.
Depending on the project, these may include changes to glazing, shading, window openings, ventilation, solar control, thermal mass or other aspects of the building design.
Yes. The overheating strategy can interact with other aspects of the building’s energy performance.
For example, where mechanical cooling is installed as part of the overheating strategy, the SAP calculation needs to reflect the installed cooling system.
Learn more about SAP Calculations.
New homes need to demonstrate compliance with the energy efficiency requirements of Part L of the Building Regulations. SAP calculations assess the energy performance of a dwelling and help determine whether the proposed design meets the required standards.
We provide SAP calculations for new-build and conversion projects, assessing energy performance, carbon emissions and key building specifications, and provide the reports needed for Building Control and compliance.
Non-domestic buildings need to demonstrate compliance with the energy efficiency requirements of Part L of the Building Regulations. SBEM assesses the energy performance of buildings such as offices, retail units and commercial spaces against the required standards.
We provide SBEM assessments for new-build and commercial projects, modelling energy performance, carbon emissions and building specifications, and providing the reports needed for Building Control and compliance.
Energy performance needs to be considered early in the design process, particularly where planning requirements call for a clear strategy for reducing energy use and carbon emissions.
We prepare energy statements for residential and commercial developments, assessing energy demand, efficiency measures and low-carbon technologies to demonstrate how a project meets its energy and sustainability targets.
Whether you’re managing a residential property, supported accommodation, office, school or commercial premises, an EPC provides an A–G energy efficiency rating and recommendations for improvement.
EPC requirements apply to many properties when they are constructed, sold or rented, with Minimum Energy Efficiency Standards (MEES) also applying to certain rented properties.
We carry out EPC assessments and provide the certification and information you need to understand your property’s energy performance and meet applicable requirements.
New homes need to demonstrate that their water use meets the requirements of Part G of the Building Regulations. Our water efficiency calculations assess the proposed fittings and appliances against the required litres-per-person-per-day target.
We calculate water consumption for new dwellings, helping you meet the required 125-litre or optional 110-litre standard and providing the documentation needed for Building Control.
Default thermal bridging values can be conservative, potentially leading to higher insulation requirements and unnecessary costs. Bespoke PSI values provide a more accurate picture of how heat moves through your building’s junctions and support compliance with Part L of the Building Regulations.
We calculate bespoke thermal bridging values for your project, helping improve SAP accuracy, optimise your specification and demonstrate compliance without over-specifying materials.
Air leakage can affect a building’s energy performance and its compliance with Part L of the Building Regulations. For new dwellings, air pressure testing is an important part of demonstrating that the required standards for air permeability have been met.
We carry out accurate air pressure tests, identify air leakage and provide the certification and reporting needed for building control.
Poor sound insulation can affect comfort, privacy and compliance in residential developments. Under Part E of the Building Regulations, buildings must provide appropriate resistance to the passage of sound.
We carry out airborne and impact sound testing to assess acoustic performance, identify issues and provide the test results and reporting needed for building control.
Is the ventilation system actually delivering the airflow it was designed for? Our testing checks MEV, MVHR and other mechanical ventilation systems at individual terminals, helping identify performance issues before they hold up sign-off.
We provide accurate flow-rate results and the certification needed to demonstrate compliance with Part F of the Building Regulations.
Compliance in supported housing is a different beast.
It has stricter frameworks, sector-specific requirements and a very different set of responsibilities.
We have a specialist division built entirely for it. Same one-stop-shop approach, built specifically for housing providers, care organisations and nominated individuals managing property compliance.
