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We provide comprehensive, end-to-end, cost efficient packages for residential and commercial Part L compliance and acoustic consultation.

Air Leakage Diagnostics Pre-retrofit Air Tightness Test Thermal Performance U-value Modelling Post-retrofit Air Tightness Test
U-value Modelling Air Leakage Diagnostics Pre-retrofit Air Tightness Test Thermal Performance Post-retrofit Air Tightness Test

Fast, Accurate Compliance. Guaranteed

Our Part L package is designed to take the headache out of the construction compliance process, bundling the vital services (SAP calculations, air tightness testing and EPC production within 24 hours) into a single, streamlined process.

In addition to the cost and time savings of keeping all your compliance under the care of one expert team, you can track real-time progress via the FES Cloud.

SAP Calculations

With years of industry experience, and a practical, commercially focussed approach, you can rely on us to stay up to date with any regulation changes and deliver an expert service. We assist clients at group level to establish specifications and have the capacity to work alongside the busiest partners nationwide.

Air Tightness Testing

We are here to help you get the certification you need. If something goes wrong and your building is not compliant, we will stay on site, work with you and re-test wherever possible. We promise a 24-hour turnaround of your certificate, along with your EPC, when you order our residential package of services.

EPC Certification

We promise to get you the vital paperwork within 24 hours of your air test, when you book our residential Part L package. We complete 600 – 700 EPCs a month, with our in-house team available to work on projects of all sizes nationwide.

Energy Statements

We work nationally providing Energy Statements in order to meet local policies and planning requirements, including The London Plan. Our assessors offer advice and consultancy to ensure each report complies in the most appropriate and cost-effective approach for our clients.

Air Quality Assessments

The team have a wealth of experience working on planning applications, having developed longstanding relationships with local authorities and Environmental Health Officers. We pride ourselves on a collaborative approach and will work closely alongside your architects, developers, contractors and other individuals. Provided by our trusted partner NoiseAir Ltd, we deliver services to ensure your planning application isn’t rejected due to the impact of air quality by the project.

“FES has proven their ability to offer our business a consistently high level of service. Their offer of SAP, sustainability reports, air tightness testing and other services enable us to take a one stop shop approach to sustainability.”

Jamie Bursnell, Group Technical Advisor, Persimmon Homes


EPC certificates
completed in 2021


air tightness test
completed in 2021


Our experienced team understands that you need a seamless, efficient path to compliance.

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