Professional remote SAP calculations, as-built assessments, and new build EPCs for projects across the UK. Specialist expertise in non-standard, low-carbon, and sustainable construction methods.
Energy Performance Direct provides remote SAP calculations, as-built assessments, and new build EPCs for projects across the UK. Our service supports design-stage optimisation, Building Regulations compliance, and final certification, with specialist expertise in non-standard, low-carbon, and sustainable construction.
Design-stage SAP calculations are essential for demonstrating Part L compliance before construction begins. They enable you to optimise your design for energy performance and Building Regulations approval.
Natural Building Methods
Cob, hempcrete, straw bale
Modern Methods of Construction
SIPs, ICF, modular builds
Passive & Low-Energy Homes
Fabric-first, Passivhaus-style
Self-Build & Custom-Build
Individual plots, unique designs
Completion stage assessments using final construction details for Building Control sign-off and EPC lodgement.
As-built SAP calculations use your final construction details to confirm Part L compliance and generate your Energy Performance Certificate.
New build EPCs are generated from your as-built SAP calculation and lodged on the national register for Building Control sign-off.
Energy Performance Direct has specialist experience modelling SAP for natural and modern methods of construction that require careful interpretation within the SAP methodology.
Traditional earth building requiring careful thermal mass modelling
Bio-based insulation with unique thermal and hygroscopic properties
High-performance natural insulation requiring specialist U-value calculations
Factory-built panels with excellent thermal performance
Combined structure and insulation requiring thermal bridging analysis
Mixed construction methods requiring detailed element modelling
These construction methods require careful interpretation within SAP to ensure compliance while reflecting real-world performance.
We regularly model low-carbon heating, renewable energy systems, and fabric-first design strategies. Our approach focuses on performance-led compliance, not box-ticking.
Air source (ASHP) and ground source (GSHP) systems
Photovoltaic systems with storage integration
Mechanical ventilation with heat recovery
Passive and low-energy building strategies
SAP remains the current compliance methodology for new build dwellings. However, the UK government is transitioning toward the Home Energy Model (HEM) as part of the Future Homes Standard.
This ensures projects remain robust, adaptable, and compliant as regulations evolve.
We provide SAP calculations and EPC services nationwide with fast turnaround and competitive pricing.
Full coverage for all English regions including London, South East, South West, Midlands, North
Complete SAP services for Welsh projects under Part L Wales Building Regulations
SAP-based assessments where applicable for Scottish Building Standards
All calculations follow current BRE SAP conventions and guidance
Full alignment with Building Regulations Part L requirements
Documentation suitable for submission to Building Control
EPC lodgement via approved accreditation schemes
Yes, SAP calculations are legally required for all new build dwellings, conversions to dwellings, and certain extensions in England and Wales. They demonstrate compliance with Part L of the Building Regulations and are needed at both design stage (before construction) and as-built stage (for completion sign-off and EPC lodgement).
SAP (Standard Assessment Procedure) is the current UK methodology for assessing dwelling energy performance. The Home Energy Model (HEM) is the government's planned replacement, designed to be more accurate and support the Future Homes Standard. SAP remains the compliance route until HEM is formally adopted. Energy Performance Direct designs SAP models in a HEM-ready way to future-proof your project.
Yes, all our SAP calculations are carried out remotely. We work from your architectural drawings, construction specifications, and system details. Remote delivery enables fast turnaround, competitive pricing, and access to specialist expertise regardless of your location in the UK.
We need architectural drawings (plans, elevations, sections), construction specifications (wall, floor, roof build-ups with U-values), window and door specifications, heating system details, ventilation strategy, and any renewable technologies. We can work from draft designs at design stage and as-built specifications for completion.
Standard SAP calculations are typically completed within 3-5 working days from receipt of complete information. Complex projects with non-standard construction or multiple dwelling types may take longer. We offer expedited services for urgent projects.
Yes, we have specialist experience modelling SAP for natural and non-standard construction methods including hempcrete, straw bale, cob, SIPs, ICF, and timber frame. These require careful interpretation within SAP to ensure compliance while accurately reflecting real-world thermal performance.
The Sticklepath conversion case study shows exactly what an as-built SAP looks like — fabric performance, U-values, system penalties and the path to a higher rating with early engagement.
Five-option improvement pathway with full financial payback analysis. Listed Victorian period building modelled in SBEM, demonstrating that even the most challenging heritage stock can reach Band A with the right staged plan.
Read case studyPoorly insulated solid-brick commercial building with flat concrete roof and mixed gas/electric heating. Staged unit-split improvement plan taking the property from G242 through Band E and on to Band B with a solar PV pathway to A.
Read case studyRetrospective SAP 10.2 calculation for a 36.1 m² stone outbuilding converted into a 1-bed holiday let. Excellent fabric (U-values 0.13–0.16 W/m²K) let down by all-electric panel heaters. MEES compliant, with a clear pathway to Band C for the 2030 standard.
Read case studyWhere SAP work sits inside a broader domestic advice engagement, we apply a systematic two-stage process: each candidate improvement measure is first modelled in isolation and ranked across five criteria (EPC points, energy saving, CO2, cost saving, payback), then the top-ranked measures are grouped into three cumulative implementation Rafts — priority, Band C target, and deep retrofit. This is how the DEAR (Domestic Energy Advice Report) reports we produce turn a single EPC into three costed, modelled pathways.
Read the full methodology