Energy Compliance & Design Services
How We Can Help
At Energy & Design Ltd, we offer a full range of energy, compliance, and sustainability services for residential developments across the England, Scotland and Wales. Whether you’re planning a single home or managing a multi-unit project, our team provides technical support from design through to completion. Below is a summary of our core services.
SAP Calculations
SAP assessments are required for all new residential dwellings to show compliance with Part L of the Building Regulations. We provide both design stage and as-built SAPs, along with expert guidance to help you meet carbon and energy targets. Learn more about SAP Calculations.
SAP Calculations (Extensions)
If your extension includes more than 25% glazing, a SAP calculation is required to demonstrate compliance with Approved Document Part L12021. We assess both existing and proposed elements to identify the most suitable solution for your project.
Approved Document Part L12021 is used to assess compliance for extensions, refurbishments, and change-of-use developments. Extensions or conservatories with glazing exceeding 25% of the extended floor area will require SAP calculations to demonstrate compliance. Learn more about SAP Calculations (Extensions).
New Build EPC
We provide certified Energy Performance Certificates for new dwellings. These are issued once the final SAP assessment is complete and are needed for property sale or rental. Learn more about New Build EPC.
U-Value Calculations
We calculate U-values for floors, walls, and roofs to support compliance and improve energy efficiency. Our reports help identify the best performing and most cost-effective insulation build-ups. Learn more about U-Value Calculations.
TM59 Analysis
For residential buildings where overheating is a concern, TM59 dynamic thermal modelling offers detailed performance data across the year. This helps developers and designers meet Part O and occupant comfort targets. Learn more about TM59 Analysis.
Part-O
Part O is a new requirement focused on reducing overheating in new homes. We assess designs using either the simplified method or full TM59 modelling, depending on your project and location. Learn more about Part-O.
PassivHaus
PassivHaus design creates homes that are low energy, comfortable, and built to last. We support your project through feasibility checks, PHPP modelling, airtightness planning, and full certification. Learn more about PassivHaus.
Water Calculations
The Water Efficiency Calculator for New Dwellings is the Government’s national methodology for assessing water efficiency in new homes in support of the Building Regulations. When constructing a new dwelling, the water consumption of the property must be calculated in accordance with this guidance. The calculation is based on a number of standard assumptions and is expressed in litres per person per day.
Part G of the Building Regulations, updated in April 2010, sets a whole-building standard of 125 litres per person per day for domestic buildings. This comprises 120 litres per person per day for internal water use, plus an allowance of 5 litres per person per day for external water use, as defined by the Water Efficiency Calculator for New Dwellings. Learn more about Water Calculations.
BREEAM UK New Construction: Residential
A comprehensive approach to sustainability.
Learn more about the BREEAM UK New Construction: Residential.
Architectural Design
From initial plans through to working drawings, we offer full architectural design services for residential builds. Our designs balance planning needs and energy efficiency. Learn more about Architectural Design.
PSI Details
We provide bespoke PSI value calculations to replace default Accredited Construction Details. This reduces thermal bridging and improves SAP performance for modern construction. Learn more about PSI Details.
Air Tightness Testing
We carry out air tightness testing to measure uncontrolled air leakage and help you meet Part L compliance. Both standard blower door and pulse testing methods are available. Learn more about Air Tightness Testing.
Future Homes Standard
The Future Homes Standard is set to become law in 2025. We help you prepare now with SAP assessments, U-value support, and low-carbon strategy advice aligned with future compliance. Learn more about Future Homes.
Energy Statements
Energy statements and feasibility studies are often required at the planning stage. We prepare detailed reports to show how your development meets local sustainability targets and policies. Learn more about Energy Statements.
Part L Photographic Evidence
New builds must now include photographic evidence of construction stages to prove Part L compliance. We advise on what to capture, how to organise it, and how to submit it successfully. Learn more about Part L Photographic Evidence.