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An Energy Performance Certificate (EPC) rates how energy-efficient a residential or commercial building is, showing its energy use and carbon emissions. Using specialist software, we assess heating systems, insulation, windows, and overall design, and provide recommendations to improve efficiency, lower energy bills, and reduce environmental impact. EPCs are required for new buildings before completion and are commonly needed when selling or renting existing properties.
We provide EPCs for existing homes across the UK, for all types of homes. Our Domestic Energy Assessors (DEAs) carry out quick, non-intrusive on-site assessments, typically lasting 30 minutes to a few hours depending on property size. They record key details such as the building’s age, windows, heating systems and insulation, along with photos and a floor plan. This information is processed using the latest RdSAP10 software to produce an energy rating and EPC. DEAs can also explain the results and offer advice on improving the property’s energy efficiency.
We provide EPCs for commercial buildings across the UK. Our Non-Domestic Energy Assessors (NDEAs) inspect a wide range of commercial properties, gathering details such as floorplans, room sizes, and HVAC systems through a non-intrusive on-site survey. The data is processed using the latest SBEM software and conventions to generate an energy rating and EPC. NDEAs can also explain the results and advise on ways to improve the building’s energy efficiency.
Public buildings over 250 m² that are regularly visited by the public must display a Display Energy Certificate (DEC). DECs show a building’s actual energy performance based on the previous year’s energy use, rather than calculated efficiency. Each DEC includes an Advisory Report with recommendations to improve efficiency, cut costs, and reduce carbon emissions. As qualified DEC Assessors, we assess a wide range of public buildings—such as schools, hospitals, libraries, surgeries, and council offices—by collecting energy-use data and producing a legally valid DEC using approved Operational Rating (OR) software.
ESOS Lead Auditors help organisations meet their legal obligations under the Energy Savings Opportunity Scheme by carrying out detailed energy audits across buildings, processes, and transport. Businesses qualify if they employ more than 250 people or have an annual turnover above £45 million. Using approved methodologies, we identify key energy uses and cost-effective opportunities to cut consumption and carbon emissions. We handle the full compliance process — from data collection to producing and signing off the ESOS report — ensuring all Environment Agency requirements are met. Our assessors provide clear, actionable insights to improve efficiency, reduce operating costs, and support sustainability goals.
Overheating assessments evaluate how a building performs in warm weather to ensure it remains comfortable and safe. Required under Building Regulations Part O, they show that effective passive design measures are used to control heat without relying on air conditioning. Our qualified assessors complete assessments for domestic, commercial, and retrofit projects using the latest approved software and 3D dynamic thermal modelling in line with CIBSE TM59. We analyse factors such as building fabric, thermal mass, glazing, shading, orientation, ventilation, window design, and internal gains to produce accurate, compliant reports and practical design recommendations.
SAP 10 is the UK Government’s latest method for assessing the energy performance of residential buildings, replacing SAP 2012. It provides a more accurate reflection of modern energy use and is required to demonstrate compliance with Part L of the Building Regulations for new builds and conversions. SAP 10 calculations determine a dwelling’s EPC rating and measure energy consumption, heating demand, and CO₂ emissions.
Key updates in SAP 10 include:
Our qualified assessors provide SAP 10 calculations from design through to final certification, ensuring full compliance and helping you achieve strong energy efficiency outcomes.
Using approved SAP software, we calculate a home’s energy efficiency and produce EPCs that meet Part L Building Regulation requirements. Our qualified OCDEAs support developers, builders, and homeowners from design through completion, ensuring full compliance and strong energy performance. Through detailed on-site inspections, we verify building fabric, heating systems, insulation, glazing, and ventilation to confirm the property performs as designed and meets all regulatory standards.
BRUKL is used to show that new commercial buildings meet the energy efficiency standards of Part L of the UK Building Regulations. It assesses predicted energy performance and carbon emissions and forms the basis for issuing a Commercial EPC. This ensures new developments are energy-efficient, sustainable, and legally compliant. Our qualified assessors produce BRUKL reports using SAP or SBEM calculations, which must be submitted to building control before a project can receive final sign-off.
Using industry-approved 2D and 3D modelling software, we analyse construction drawings to calculate bespoke Psi-values for walls, floors, roofs, and window junctions. These calculations improve SAP and SBEM results, support Part L compliance, and enhance overall building efficiency. Suitable for new builds, extensions, and retrofits, our reports help optimise insulation performance and reduce heat loss through thermal bridging. Our trained assessors provide accurate Psi-value calculations to ensure building junctions meet energy efficiency targets.
We carry out detailed on-site surveys to record a building’s construction, condition, energy performance, and occupancy patterns. Insulation, ventilation, heating systems, and glazing are assessed to identify effective upgrades while avoiding issues such as damp or poor airflow. Using this information, we create a compliant, project-specific improvement plan that enhances comfort, boosts energy efficiency, and reduces carbon emissions. Our qualified Retrofit Assessors, supported by our in-house Retrofit Coordinator, deliver comprehensive, tailored assessments for domestic properties, commercial buildings, and retrofit projects of all sizes.
Using advanced software and on-site inspections, we assess the building fabric — walls, roofs, floors, windows, and doors — to calculate heat loss and identify where improvements are needed. Suitable for domestic, commercial, and retrofit projects, our surveys provide data to support SAP, EPC, and PAS 2035 compliance. Our qualified assessors deliver clear, actionable reports that help reduce energy consumption, enhance comfort, and achieve long-term cost savings by accurately measuring how much heat escapes from your property and how to improve efficiency.
We carry out airtightness and ventilation tests on all building types — including houses, flats, bungalows, commercial properties, and retrofit projects. Our technicians seal potential leakage points such as extractor hoods, exhausts, and close window vents before testing.
With water and electricity active, we measure the airflow needed to maintain a set pressure difference between inside and outside, determining the building’s air leakage rate. This data is essential for assessing energy efficiency, as higher air permeability leads to greater heat loss, higher energy costs, and reduced indoor air quality.
Under TM44 regulations, any air conditioning system with an effective rated output over 12 kW must be inspected at least every five years. Our certified technicians carry out TM44 assessments to ensure full legislative compliance. Failure to complete these inspections can result in enforcement action or financial penalties.
