SAP Calculations | SAP Assessments -Vision Energy

SAP CalculationsSAP Assessments & EPCs

Find out how Vision Energy can take care of all your compliance needs for your new Build Project

Find out more about SAP Calculations

ConversionSAP Assessments

Vision Energy can take care of your energy assessments for your conversion project, find out more today

Find out more about Conversion

ExtensionSAP Assessments

All Extensions with 25% or more glazing compared to the floor area require SAP & EPC's, find out more

Find out more about Extension

SAP Calculations
SAP Assessments - New Build

SAP Calculations in accordance with Building Regulations Part L1a for new build developments, All SAP Calculations come with U-values, Reports for Building Control, and advice and specifications to ensure compliance. We will work with each project from the design stage all the way to completion to ensure the project runs as smooth as possible.

SAP Calculations & EPC's For All Building Projects

Vision Energy will work with you on your building project from design stage all the way through to completion, from single dwellings to developments with 100+ dwellings, Vision energy strive to ensure that all SAP calculations are completed to achieve compliance as well as providing cost effective and feasible solutions to ensure the smooth delivery of your project. Read more about the SAP Calculation Process for New Build. Vision Energy can also take care of your SAP calculation’s for conversion projects and also extensions.

All SAP assessments come with

  • Dedicated energy assessor,
  • Free U-values for Wall, Floor & Roof elements
  • Commitment to achieve compliance without applying costly or solutions that will prolong the build proccess

Vision are more than happy to assist you on all aspects from planning to building control sign off, get in touch to talk to one of our technical team to ensure that your project achieves compliance to Building Regulations Part L1a


Building Regulations Part L1a
New Build Dwellings

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Sustainability & Building Compliance

Vision Energy are a leading Sustainability & Energy consultancy working nationwide. We specialise in calculations & reports covering Building Regulations, Planning Permission and all other sustainability or energy needs within the construction sector. With a vast amount of knowledge and experience having worked on thousands of projects across the UK one of our engineers would be more than happy to assist you on your project. SAP Calculations | SBEM Calculations | Energy Statements | BREEAM Pre-Assessments | M&E Design | EPC's | Water Efficiency | Air Permeability

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What are New Build SAP Calculations & EPC’s?

Building Regulations Part L1a requires all new build dwellings to undergo SAP calculations (standard assessment procedure calculations) to measure the energy efficiency of the dwelling in order to conform to Regulations. 

SAP calculations measure the annual energy costs of a new dwelling, the calculations assess heating elements (including water heating), Ventilation, and lighting elements of the dwelling/s, in doing so the annual C02 emissions for the dwelling/s are calculated.

What Elements are assessed during SAP Calculations?

When SAP Calculations are carried out on all dwellings, a number of factors are used to calculate the energy cost & C02 emissions, below is an overview of the elements included within every SAP Calculation,

  • Thermal efficiency of Walls, Floors & Roof elements

  • Thermal efficiency of glazing & doors

  • Boiler efficiency

  • Secondary heating i.e. log burners, open fires

  • Renewable energy i.e. solar panels, Air/ground source heat pumps

  • Air Tightness of the dwelling

What is the target a dwelling needs to meet?

When it comes to achieving compliance, no set standard is in place that a dwelling needs to meet. instead, During the SAP calculations (standards assessment procedure calculations) the target will be calculated based on a number of factors such as dwelling size, orientation, design & layout. Therefore each dwelling has a completely unique target to achieve, Based on the target being unique to each dwelling Vision Energy recommends completing your SAP calculations at a design stage.

How does the overall process work throughout the design and build process?

Vision Energy recommend carrying out your SAP Calculations at a design stage, however if your dwelling/s is already complete don’t worry, we can still carry out your SAP Calculations at an ‘as-built’ stage, below outlines the step by step process Vision Energy will take to ensure compliance to Building Regulations Part L1a,

Initial Design Review – Vision will review the plans and information provided within architectural drawings or specifications

Design Stage SAP Calculations – Design calculations will be carried out to review the compliance to all elements in Building Regulations

Design Review & Alterations – Were required, Vision will advise on any alterations that are required to the design of the dwelling/s to comply with Building Regulations Part L1a, ensuring that the design alterations are cost effective and feasible on site,

Design SAP Calculations & Predicted EPC – Vision will issue the design stage calculations and predicted EPC for submission to Building control/Local Authority

As-Built SAP Calculations Review – Once the construction of the dwelling/s is nearing completion, Vision Energy will review the construction details compared to the design SAP Calculations to ensure the dwelling/s have been built to the specification, If any alterations have been made, Vision will rerun the calculations and review compliance

As Built SAP Calculations & EPC – Once the review has been complete and confirmed, Vision Energy will issue and lodge the As-built SAP Calculations & EPC for submission to Building Control/ Local Authority

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Frequently Asked Questions

Get your SAP calculation completed at the design stage this give time for alterations. Utilise good building fabric and also consider ways to lower the thermal mass to reduce the energy require to heat the building fabric. Use renewables where possible such as waste water heat recovery or photovoltaic panels. Avoid heat escaping between dwelling by in insulating party walls.  Use the latest technology in smart heating controls and low energy light bulbs.

To read more visit our blog post:  How to pass SAP Calculations

SAP Calculations are carried out by a qualified On-Construction Domestic Energy Assessor. The assessor should hold the relevant certification and insurance to cover the SAP Calculations work. If you have any queries on qualifications or insurance, please contact our team and we will be able to provide all relevant documentation.

SAP Calculations are the calculations behind the production of an EPC for a new build, change of use, or extended dwelling. The calculations will show compliance to Building Regulations Part L and also produce the relevant figures to assign a rating of 1-100 to the dwelling, showing how energy efficient the dwelling is, also known as the EPC (energy performance certificate).

SAP standards for Standard Assessment Procedure. This procedure is an approved method of calculating and assessing the energy performance of a dwelling.

It is recommended to carry out SAP Calculations at the design stage of your project initially, this is to review compliance for all elements of the build, in accordance with Building Regulations Part L. This allows for any amendments to be made prior to the build starting on site.

If your project has already commenced and SAP Calculations have not been completed, SAP Calculations can still be produced at this stage, we would just work with ‘as-built’ information rather than ‘as designed’.

On completion of the project, the SAP Calculations will be updated and an EPC produced.

The cost of SAP Calculations can vary depending on dwelling numbers, size, and complexity. Single dwelling SAP Calculations normally range between £180-295+VAT.