Calculations for Extensions and New Build Projects
Understanding the Differences Between SAP Calculations for New Build Properties and Extensions
What Are SAP Calculations?
Before diving into the differences, let's briefly explain what SAP Calculations are. SAP Calculations are the UK government's method for assessing and comparing the energy and environmental performance of residential properties. These calculations are essential for obtaining a Building Regulations compliance certificate, which is required before a new property or extension can be signed off by building control.
SAP Calculations for New Build Properties
For new build properties, SAP Calculations are a fundamental part of the design and construction process and, in most buildings, a legal requirement. Here’s 4 main reasons why:
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Building Regulations Compliance:
For new builds, SAP Calculations are required to demonstrate compliance with Part L of the Building Regulations, which focuses on the conservation of fuel and power (ADL12022). These calculations ensure that the new property meets stringent energy efficiency standards, covering aspects such as insulation, heating systems, and renewable energy sources. Generally most planning departments and building Control Bodies will require both an ‘As Designed SAP Calculation’ to be carried out pre-construction and an ‘As Built’ Sap Calculation post construction.
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Detailed Assessment:
The process involves a thorough evaluation of the building’s design, including the materials used, thermal insulation, air tightness, and the efficiency of heating and hot water systems. The calculations also take into account the orientation of the building and local climate conditions. This means we will need as much information as possible at the design stage: Plans, Specifications, Proposed renewable technology, proposed insulations etc.
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Energy Performance Certificate (EPC):
Upon completion of the SAP Calculations for a new build, generally an Energy Performance Certificate (EPC) is issued. This can only come from a SAP assement. A Domestic Energy Assessor cannot produce an 'On Contruction EPC' on your newbuild property. This certificate is crucial for selling or renting the property, as it provides potential buyers or tenants with an overview of the building’s energy efficiency.
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Design Flexibility:
For new builds, there is greater flexibility in design choices, as the entire structure is being built from scratch. This allows developers to incorporate the latest energy-efficient technologies and construction methods to meet SAP requirements. We often work with architects who experiment with a few SAP models before we issue the final ‘As Designed’ SAP Calculations.
SAP Calculations for Extensions
When it comes to extensions, the approach to SAP Calculations is somewhat different, reflecting the unique challenges of modifying an existing structure and the needs of the Building Control Body. These are often triggered as a result of ‘Excessive Glazing’, ie more glazing than is permitted in the Building regualtions. When this occurs, it doesn’t mean you will have to scrap your plans and start again, but rather the deemed impact of the extra gazing is ‘offset’ against other elements of either the extension itself or the main property its attached to. Generally this is demonstrated through a SAP Calculation.
Here are the 4 main differences for a SAP Calculation for an extension vs a new build:
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Specific Building Regulation Requirements:
While new builds must comply with ADL1 of the Building Regulations, differnent sections of the document apply to extensions. This section of the regulations focuses on alterations to existing buildings, ensuring that any new addition does not negatively impact the overall energy efficiency of the property and has different methodology to a new build project.
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Targeted Assessment:
SAP Calculations for extensions involve assessing the thermal performance of the new structure individually as a first instance, testing to see that it complies. This might include evaluating the extension’s insulation, windows, and the integration with the existing heating system.
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Consideration of Existing Structures:
If the extension is not meeting the regulations, for example the glazing as mentioned above), it would then be necessary to consider the existing building's energy performance. The SAP Calculations will need to account for how the extension affects the overall energy efficiency of the property, and whether any upgrades to the existing building are required as compensation to meet the standards.
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Proportional Requirements:
For extensions, generally the requirements can be more flexible compared to new builds, especially if the extension is modest in size. However, it’s still crucial that the extension adheres to energy efficiency standards to avoid penalties or delays in obtaining Building Regulations approval.
Why Choose us for Your SAP Calculations?
Whether you’re constructing a new property or extending an existing one, understanding the nuances of SAP Calculations is essential for a successful project. Here is why many people trust SAP2SBEM.co.uk for their project:
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We always strive to deliver accurate and reliable SAP Calculations tailored to your specific project needs.
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We works closely with architects, builders, and homeowners up and down the country to assist with compliance with all relevant regulations, helping you avoid costly delays and ensuring a smooth approval process. This bank of knowledge will only help your project.
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We review and keep our prices competitive and always look for cost saving compliance routes for your build
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We are a small team and therefore give your project the personal attention it deserves.
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We are qualified and registered for both new build Domestic and Non Domestic compliance projects and often work on mixed development projects.
If you are looking for SAP Calculations for your current or next new build or extension, or if you have any questions about the process, don't hesitate to contact us.
We’re here to help you navigate the complexities of Building Regulations and achieve the best possible energy performance for your property, all at a competitive price.