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SAP Calculations for Conversions from a leading Energy Consultancy

Our experienced team of engineers are well-versed in all aspects of energy efficiency, so you can rest assured that whatever the project –  Part L1B Conversion or Extension – your home will meet the required standards and be highly efficient.

SAP Calculations from £80+VAT.

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If you would prefer us to call you back today about your quote, please send us a short message using the form below or email

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Save up to 50% compared to architects

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Services available nationwide. Fast-Track available.

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Approved accredited assessors

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What are SAP Calculations for Conversions?

It’s important to remember that when it comes to dwellings, conversions can constitute a ‘material change of use’ (sometimes referred to as a “change of use”). This is true if, after completion, the building either now contains an apartment, constitutes one or more dwellings, or has fewer than before. Similarly, a ‘change in energy status’ will occur where a previously unheated space/building is designed to be heated in the future – typically if it is going to be used as a dwelling.

Ultimately, following Approved Document L1 requirements means your new home or conversion must be designed and built with minimal or reduced carbon emissions in mind – something which can be achieved using the Government’s Standard Assessment Procedure (SAP).

How do SAP Calculations for Conversions work?

We are knowledgeable in conducting SAP calculations from plans both established and proposed, as well as providing a comprehensive specification for construction and services. All assessments can be carried out remotely so there is no on-site visit or survey necessary.

For compliance, there are several options of SAP Calculations available and we promise to assist you every step of the way towards achieving the best possible outcome. The assessment process features two distinct phases: design, where we guarantee that your concepts comply with L1b SAP standards for controlled fittings, services and building materials; and as-built, which involves us issuing final documentation plus an Energy Performance Certificate (EPC) if applicable.

We also verify existing structures meet regulations while pinpointing ways to enhance them with new elements such as insulation or heating systems. Ultimately, our aim is to make sure each part – old or new – performs at its maximum potential and reduce carbon emissions.

Please note: SAP Calculations are different from an Energy Performance Certificate. Typical SAP Calculations are used to demonstrate to building control how a building or conversion will comply with building regulations due to a ‘material change’ or ‘change in energy status’ while an EPC demonstrats the energy efficiency of a building.

Often coupled with:

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Energy Statement

water testing

Water Consumption Calculation (Part G)

part o

TM59 Overheating Assessment

air testing

Air Pressure Testing

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Sound Testing

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Energy Performance Certificate (EPC)

ventilation testing

Ventilation Testing

Sam Guest

If you need assistance ...

Speak to us about additional services or add them when you get your online quote.

Ready to get started?

SAP Calculations from £80+VAT.
Same day quotes available.

Ready to ensure your building project meets the highest standards of energy efficiency? Contact Focus 360 Energy today for a bespoke SAP Calculation quote. Let our accredited professionals guide you to compliance and beyond, with expert advice, efficient service, and competitive pricing. Start your journey to a greener, more efficient future now.

Download our Service Guide

Download our guide to the multiple services you may need for each stage of your project.

Services from Concept Doc V3

Our SAP Process makes it easy for you.

We want the whole process to be as easy as possible. On acceptance of a quote, you'll be emailed a simple checklist that can be completed online - no complicated PDFs or documents downloads that need to be completed and then returned!

To see the type of information required, view the example below.


Schedule your EPC

Schedule your appointment

Now that you’ve approved your quote in our online portal, you can schedule an appointment with the surveyor.


Schedule your EPC

Assess your plans and specifications

We will provide you with an online questionnaire to complete and are more than happy to coordinate directly with your architect and builder.


Schedule your EPC

SAP Design Stage Calculations

Our expert SAP Assessors will calculate and produce your Design Stage SAP Calculations.


Schedule your EPC

Guidance for pass (if applicable)

If required, we will provide guidance and advice to help you achieve an energy efficiency pass.


Schedule your EPC

Complete your SAP Calculations and EPCs

Our team will complete and publish your As-Built SAP Calculations and EPC Certificates.


Schedule your EPC

Supply your documents

We take care of everything and provide you with all the necessary documents.

How Much Are SAP Calculations?

SAP Calculations and assessments start at £80 per unit depending on the intricacy of the building and the size.

The cost of our services hinges on the dimensions and intricacy of your dwelling. Our preference is to offer bespoke quotes on a case-by-case basis, ensuring you get the most competitive pricing.

Connect with us and share your plans or accredited construction details today! Our energy assessment prices encompass a comprehensive package, covering lodgement and registration fees, expert advice on building regs compliance, iterative improvements, and the issuance of all supporting documentation.

Important Information To Help You Plan For Your SAP Assessment

SAP assessments are crucial in helping us understand your design. Ideally, we need accredited construction details and detailed, up-to-date drawings, preferably in electronic format.

We cannot use photographs, rough sketches or water colours! You may be asked to provide a fairly detailed specification for what you are building. This is so we can understand how advanced your design is, what is set in stone, what is flexible and what is completely unknown. Your assessor can then help you fill in the gaps and give some guidance.

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When are SAP Calculations for Conversions needed?

SAP Calculations for Conversions are required when a building is being converted from a non-domestic use to a domestic use, such as from a shop or office to a house classed as a ‘Material Change of Use’ or a Change of Energy Status. The SAP Calculation will assess the energy efficiency of the proposed changes and provide recommendations for improvement where necessary.

When it comes to changes in material use, you may be looking at things like:

  • Transitioning a building from a non-residential or commercial property to residential use
  • Adding an additional flat to the existing structure
  • Increasing the number of dwellings within one building.

A transition to a new energy status may be necessary when an unheated area or building is newly intended for heating. It’s also possible that a shift in the usage of a building could result in changes to its energy status. We’re here to guide you through this process and make sure you remain informed and up-to-date with everything related to the alteration of your energy status! Any issues that arise during the process of delivering your SAP Calculations will be handled efficiently by our knowledgeable team, providing peace-of-mind and quick solutions so you can move forward with your plans smoothly.

Our process – how we ensure you meet the required standards

We understand how important it is to stay compliant with conversions, which is why we leverage our SAP Calculations to check if the U-Values are meeting the standards stated in all technical documents and approved by government. If these values don’t meet expectations, we want you to feel comfortable knowing that our team will assist you with advice on how best to proceed.

Furthermore, we go above and beyond when making sure that all lighting and heating levels meet the minimum requirements. If they do not, please be assured that we will guide you through every step necessary for them to become compliant!

Simply download and complete our checklist and supply all the required information to us and we are able to offer a fast and efficient 5 day turnaround for SAP calculations on extensions. If this isn’t soon enough for you, then our expert team can further accelerate the process for just £75 + VAT.

Helpful information you may need to supply?

  • Floor plans, sections & elevations
  • Orientation e.g. site plan of existing elements
  • Construction specification of existing walls, new structures, roofs and floors
  • Specification for all windows
  • Details on primary & secondary heating systems
  • Renewable technology (if any)

Please call 0333 772 2798 if you have any questions.

What is included?

  • All SAP calculation documentation required for compliance with the Building Regulations from Design (PEA) to On Construction 
  • Additional recommendations if required to ensure a pass is achieved every time
  • Advice and support throughout the whole process
  • Quick turnaround
  • We are happy to deal directly with your Builder, Architect or Building Control Officer during our site visit

Frequently Asked Questions

What are SAP Calculations?

SAP stands for ‘Standard Assessment Procedure’ and is the government’s method for calculating the energy performance of dwellings. These calculations are only necessary for residential properties. The calculations determine a Target Emissions Rate (TER) and a Target Fabric Energy Efficiency (TFEE) rate.

How much is a SAP Calculation?

Our fees are typically based upon the size and complexity of a dwelling. We do prefer to offer a bespoke quotation on a job-by-job basis to give you the best price – So get in contact and send us your plans today!

Can I do a SAP Calculation for conversions myself?

SAP Calculations must be carried out by an On Construction Domestic Energy Assessor or OCDEA, working with approved Government program. The Assessor must be certified under one of several accreditation schemes and is regularly audited to keep their certification.

What is required for a SAP Assessment?

Your Assessor would advise you of exactly what is needed. Typically you would need the following:

  • Floor plans, sections & elevations
  • Orientation e.g. site plan
  • Construction specification of walls, roofs and floors
  • Specification for all windows
  • Primary & secondary heating systems
  • Renewable technology (if any)
What happens if my design fails its SAP Assessment?

If your design fails its SAP Assessment, then you will need to revise the design to meet the requirements. Depending on the extent of the changes required, you may need to go through the assessment process again. In some cases, you may need to have additional testing done to verify the design’s performance. The SAP Assessor will provide guidance on the necessary steps to make your design meet the requirements.

Are SAP Calculations the same as an Energy Performance Certificate?

No, SAP Calculations and Energy Performance Certificates (EPCs) are not the same. SAP Calculations are used to determine the energy performance of a building and are used in the UK to comply with Building Regulations. An Energy Performance Certificate is a certificate that shows the energy efficiency of a building and is required when a building is built, sold, or leased. The EPC uses the results of the SAP calculation to give the building a rating from A to G, with A being the most energy efficient and G being the least. The EPC also provides recommendations for improving the energy efficiency of the building.

Ready to get started?

SAP Calculations from £80+VAT. Same day quotes available.

Ready to ensure your building project meets the highest standards of energy efficiency? Contact Focus 360 Energy today for a bespoke SAP Calculation quote. Let our accredited professionals guide you to compliance and beyond, with expert advice, efficient service, and competitive pricing. Start your journey to a greener, more efficient future now.

SAP Calculations for all your building projects

If you are planning a New Build or Conversion, you may need additional services that our experts can assist with, for example Residential Air Testing, Sound Testing, Ventilation Testing, U-Value Calculations, Water Efficiency Calculations, Thermographic Surveys, Energy Performance Certificates, Part O Overheating Calculations, London Plan and Thermal Bridging Calculations.

Get started to day and speak to us about the additional services you may need.

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Part L1A
SAP Calculations for New Builds

All new dwellings must now have a SAP calculation performed at design stage in order to demonstrate compliance with Part L1A of the Building Regulations.

architects 1

Part L1B
SAP Calculations for Extensions

If you build an extension where the glazing is over 25% of the floor area, then we can undertake SAP Calculations to demonstrate Part L1B Building Regs compliance.

builders and developers

Part L1B
SAP Calculations for Conversion

If you renovate a building such that there has been a material change in use, then we can undertake SAP Calculations to demonstrate Part L1B Building Regs compliance.

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