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Energy Services
SAP Calculations - Extensions
We often desire a continuous visual connection with the outdoors. This is typically achieved through glass in both walls and roofs. When constructing an extension where glazing exceeds 25% of the floor area, calculations must be provided to Building Control to demonstrate compliance with Part L of the Building Regulations. This is necessary because glazing has a lower thermal performance compared to other building elements.
At Ashwood, we can provide the required SAP Calculations to ensure compliance is achieved. This includes any recommendations needed for improving the existing dwelling or the fabric of the new extension. We’ll handle all the technical details, like U Values and DER/TER CO2 emissions.
SAP Calculations - New builds & Conversions
As designed stage
Upon receipt of construction drawings and specification we can provide you with all of the relevant SAP documentation to be submitted to Building Control as part of your Building Regulations application.
As built stage
Secondly, once the dwelling has been built and the construction methods and specification are confirmed, we can then issue the Energy Performance Certificate. The EPC is required for your completion certificate.
Excessive Glazing Calculations
In today's world, we often seek an uninterrupted visual link with nature, which is commonly accomplished through large glass sections in walls and roofs. When planning an extension with glazing that covers over 25% of the floor area, Building Control requires calculations to ensure it complies with Part L of the Building Regulations, as glass is less thermally efficient compared to other construction materials.
Ashwood Energy can provide the necessary SAP Calculations to guarantee compliance. We also offer recommendations for improving either the existing structure or the new extension's design. We’ll handle all the technical details, like U Values and DER/TER CO2 emissions.
BREL Report (New Build Only) & Energy Performance Certificates
As designed stage
Upon receipt of construction drawings and specification we can provide you with all of the relevant SAP documentation to be submitted to Building Control as part of your Building Regulations application.
If it’s a new dwelling you will also need Part G & Part O calculations.
As built stage
Secondly, once the dwelling has been built and the construction methods and specification are confirmed, we can then issue the Energy Performance Certificate. The EPC is required for your completion certificate.
Energy Statements for Planning Applications
New policies S6, S7, and S8 require an Energy Statement which outlines how a development plan meets energy policy requirements or explains any challenges in meeting them. It should show how energy efficiency is considered at each stage, from initial design to application submission. The Energy Statement can also address other policies like decentralised energy networks (S9), circular economy (S10), embodied carbon (S11), and resilient design (S20). Energy efficiency should be considered throughout the design process, with early decisions on layout and form being crucial. The Energy Statement documents the steps taken and decisions made. It’s best to start this document early in the development process, as it is needed for approval
Overheating Calculations
This Building Regulation relates to Residential (dwellings) , Residential (institutional) , and Residential (other).
The aim of requirement O1 is to protect the health and welfare of occupants of the building by reducing the occurrence of high indoor temperatures.
In the Secretary of State’s view, requirement O1 is met by designing and constructing the building to achieve both of the following.
a. Limiting unwanted solar gains in summer.
b. Providing an adequate means of removing excess heat from the indoor environment.
This is completed via either a ‘simplified’ or ‘dynamic thermal modelling’. It is imperative that this is done before construction starts to avoid potential mitigation.