At Armeec, we provide expert SAP calculations to help your project meet Part L compliance with ease. With years of experience nationwide, we deliver cost-effective energy solutions and rapid reports, letting you focus on your build without worrying about the rules.
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A SAP (Standard Assessment Procedure) calculation is the government's official methodology for assessing and comparing the energy and environmental performance of dwellings. It’s a strict legal requirement for all new homes and major renovations across the UK.
It measures critical metrics such as predicted energy use and carbon emissions to make sure your property meets Building Regulations. You need a passing SAP report to generate an Energy Performance Certificate (EPC), which is mandatory before you can sell, rent, or legally complete a new home.
To accurately model your home’s energy performance, our accredited assessors meticulously evaluate the following core elements of your architectural design.
We assess the U-values of the building fabric—wall, floor, roof, and glazing efficiency—to measure overall heat retention.
We analyze the type and efficiency of your primary heating setup and hot water provisions, including any advanced thermostatic controls.
We evaluate the use of low-energy and LED lighting throughout the property to calculate expected electrical consumption loads.
We check for proper intentional airflow (like MVHR systems) alongside targeted air permeability rates to maintain efficiency and comfort.
Whether you are developing a new estate in Birmingham, a single dwelling in Manchester, or undertaking a massive extension in the South East, a SAP calculation is needed to ensure your building meets UK energy rules as set out in Part L of the Building Regulations.
To achieve Part L compliance, your property must demonstrate that it meets or exceeds specific government benchmarks. The SAP software calculates two primary figures:
This is the baseline maximum allowable carbon dioxide emission rate for your property, calculated by applying a standard, "notional" set of specifications to your exact building dimensions and layout.
This is the actual predicted emission rate based on your specific proposed design (your chosen insulation, boiler, solar panels, etc.). To pass, your DER must be equal to or lower than the TER.
Note: Similar metrics are also calculated for Fabric Energy Efficiency (TFEE vs. DFEE) under the newest Part L 2021 regulations, ensuring the physical shell of the building performs excellently before relying on renewable bolt-ons.
Beyond simply providing a pass/fail compliance check, a SAP assessment calculates precise energy usage and carbon emissions, generates the data required to issue your final Energy Performance Certificate (EPC), and acts as a diagnostic tool to identify ways to improve energy efficiency.
SAP calculations are fundamentally split into two distinct categories depending on the nature of your construction project:
For highly glazed extensions where the new glass exceeds 25% of the extension's floor area, a specialized Notional vs. Proposed SAP calculation is required. We prove to Building Control that the new, highly-glazed design will not emit more carbon than an equivalent extension built to standard minimum rules.
We handle complex SAP calculations for developers and homeowners across the UK.
Our Domestic Energy Assessors are fully trained and accredited via Elmhurst. We deliver accurate SAP reports that satisfy Building Control authorities nationwide.
If your initial design fails SAP, we don't just hand you a failure notice. We work with you to find the most cost-effective upgrades to guarantee a pass.
Whether your project is in London, Manchester, Birmingham, or Liverpool, our experienced team provides rapid desk-based calculations and expert guidance.
Everything you need to know about securing your Part L energy compliance.
Don’t risk massive delays with Building Control. Get in touch with Armeec today for accurate, fast, and nationwide SAP calculations and energy advice.