Dive Into the New Age
of Building Analytics

Our Services

HEM EPC

(Home Energy Model)

Set to fully replace SAP10.3 24 Months after it's implementation.

HEM EPC's only by 2029.

Assess your projects with elmhurst accredited home energy modelling with us to prepare for the future today.

Overglazed Extension Asessments

Planning a heavily glazed extension? Where glazing exceeds 25% of the floor area, a compliance calculation is mandatory. We carry out the necessary assessments — whether an Area Weighted U-Value or a full SAP calculation — and supply a report suitable for Building Control submission.

Energy Statements

Local planning policies often set sustainability targets above Building Regulations requirements. These must be addressed through an Energy Statement.

The National Planning Policy Framework (NPPF) requires local authorities to promote sustainable development, whilst still allowing them to impose additional targets.

SAP EPC

SAP 10.2 and 10.3 Elmhurst accredited calculations from DSMHEM Ltd.

SAP 10.3 24th March 2027

HEM & SAP Dual Running June 2027

HEM Only by October 2029.

(Standard Assessment Procedure)

U-Value & Kappa Value Calculations

We provide accurate thermal transmittance (U-value) calculations for floors, walls and roofs in accordance with BS EN ISO 6946 and BS EN ISO 13370.

These feed directly into your SAP, SBEM, and Part L assessments and help you optimise your building’s insulation specification

SBEM Commercial EPC

SBEM, or the Simplified Building Energy Model, is the standard methodology for evaluating the energy performance of non-domestic buildings across the UK. The calculation covers heating, cooling, ventilation, and lighting demands, providing a comprehensive picture of the building’s annual energy consumption and CO₂ emissions

Simplified Overheating

Faster and cheaper than TM59, it is ideal for simple dwellings in lower-risk postcode areas and is frequently the most cost-effective compliance option for less complex homes with standard orientations.

PSI Ψ Value Calculations

We calculate accurate linear thermal transmittance (Ψ-values) for junctions and thermal bridges in accordance with BS EN ISO 10211. Using bespoke PSI values instead of defaults improves your SAP and SBEM results, reduces heat loss, and can reveal valuable specification savings.

Measured HTC

Subject to final HEM.

Depending on the methodology used, data is collected either overnight or over a 21 day period. Following the assessment, information collected using the relevant methodology software to create a HTC value.

There are a number of different methodologies that can be used to measure HTC.

TM59 Overheating

This approach is mandatory for all developments in the postcode zones identified in Appendix C It is also required in cases where the Simplified Method cannot be achieved or where the building design is more complex.

Water Consumption Calculatuons

Design calculations carried out in accordance to Approved Document G 2015 of the Building Regulations.

As Built calculations carried out using manufacturer or WRAS and or UWLA data and grey or rain water technologies.

Measured
U-Values