What is a SAP Calculation and Assessment and do you need it?

If you’re a new developer or building your first self-build project SAP Calculations may be hard to understand but Method Studio are here to assist. The following article can help you get to grips with what a SAP Calculation or SAP Assessment is and if you need one.

What is a SAP Calculation?

SAP (Standard Assessment Procedure) Calculations make up a big part of the planning and building compliance process and is the government approved method of assessing and measuring the energy rating of any new build dwelling. Normally this is required for new houses but you may also require a SAP Calculation for a conversion or extension. A SAP Rating is a way of comparing energy performance for different homes. The higher the SAP Rating, the lower the fuel costs and the lower CO2 emissions. The rating will be between 1 and 100+ with 100 being zero energy costs. Anything over 100 would mean energy is being exported. The SAP Calculations establish an energy cost based on the construction of the home, it’s heating system, internal lighting and any renewable technologies installed. However, it would not include energy used for cooking or appliances.

Do you need a SAP calculation?

If you are building a new home a SAP assessment will be required. But what about an extension of conversion?

• Extension: This depends on the amount of glazing that is added to the new build. Building Regulations state that if the total area of new glazing exceeds 25% of the total floor area of the new extension then you need a SAP calculation.

• Conversion: A SAP Calculation is only required if the conversion results in a ‘Material Change of Use’ or a ‘Change of Energy Status’. A material change of use means a property that is changing the purpose for which the building is used i.e. converting a dwelling into a number of flats. A change in energy status refers to buildings that have not previously been heated but will be heated in the future.

When should a SAP calculation be carried out and how long does it take?

A SAP assessor (someone qualified to carry out a SAP Assessment) will need to create a Design Stage Report and an As-Built Report. It is important to carry out SAP calculations before building work starts, then you can be confident that the plans and specifications will achieve a pass. A report can take 5-10 days but this will likely depend on the workload of the company you chose to carry out the SAP Assessment. Method Studio can recommend a number of SAP assessors that we have worked with in the past.

You may still be wondering is it really necessary to get a SAP Calculation? The answer is definitely yes! Your SAP Calculation is the method used to create that all important EPC (Energy Performance Certificate) Rating. Keep in mind that it is against the law to rent or sell a property without an EPC. Therefore, it is critical that your building passes its SAP. If you have more questions or need any further advice on SAP Calculations please get in touch with any of our team today, they will be happy to assist.