What is SAP?

SAP stands for Standard Assessment Procedure and is the official methodology used by the Government to assess the energy efficiency rating of single and multi-dwellings. It was designed by the Building Research Establishment (BRE) in 1992 as a tool to drive its energy efficiency policies and reduce C02 emissions.

SAP has been a mandatory requirement of Building Regulations Part L since 2006. Over the past decade, these regulations have become increasingly tightened to ensure developers build more suitable homes which minimise environmental impact by guaranteeing valuable resources are used effectively.

How does SAP work?

SAP is a software calculator which creates an energy cost based on the construction of a new build, its heating system, internal lighting and any renewable technologies that have been installed. It produces a score between one and 100. Anything over 100 indicates a house which is a net exporter of energy. The higher the SAP rating, the lower the fuel costs, and the lower the associated emissions of carbon dioxide.

Examples of products within a SAP calculation

  • Wall construction and levels of insulation
  • Windows – the number and level of insulation
  • Heating system – are you using a combination boiler or a heat pump? Different products also have different efficiencies
  • Mechanical Ventilation with Heat Recovery (MVHR)
  • Passive Flue Gas Heat Recovery
  • Heating Controls
  • Solar Thermal and PV
  • Waste Water Heat Recovery Systems (WWHRS) – Power-Pipe

Building Regulation Part L and Part L1A

Building Regulations Part L deals with the conservation of fuel and power which was established in 2006. Part L1A applies to new dwellings and one of its objectives is to ensure that new buildings increase their energy efficiency to meet targets set by the government.

Building regulations are mandatory and in order to meet them, builders need to gain a ‘pass’ on their SAP calculations. Without it, building control will not sign off the development and the property cannot be let or marketed for sale.

Power-Pipe and SAP

Power-Pipe WWHR is one of the most cost-effective products that can be used to increase a building’s SAP score. The table below shows the comparable cost against other SAP products.

How does the Power-Pipe WWHRS compare with other SAP technologies and products?

The following table shows you the different products that can be applied to a SAP calculation, alongside the typical SAP increase they provide and their cost.

You can use this table to see just how cost effective a Power-Pipe is against other technologies.

Product Est. SAP Increase Cost Installation Cost Maintenance User Interaction Cost per SAP 1%
Power-Pipe R2-60 5% £350 £50 N N £80
Solar PV 30% £3,000 £500 N N £116
Heating Controls 1% £120 £0 N Y £120
Insulation (increase by 50mm) 2% £250 £50 N N £125
Air source heat pump 19% £2,000 £1,000 Y Y £157
Biomass Boiler 65% £10,000 £2,000 Y Y £184
Gas flue heat recovery 4% £750 £100 N N £212
Solar thermal 12% £3,500 £500 Y N £312
MVHR 3% £1,000 £500 Y N £500
High spec. windows (triple glazing) 5% £4,000 £500 N N £900

All Power-Pipes have been independently tested and assessed by BRE. The efficiency ratings you see on our website are the official SAP scores that you will find in the SAP calculator.

How can we help?

If you are a developer, or involved with specification and would like any further information about how Power-Pipe can help you meet Part L or increase your SAP score, please contact us.

We can also arrange a meeting or CPD for larger companies who may benefit from a hands on demonstration of the device and presentation of its use and benefits.

Questions? Get In Touch

Call us:

0207 887 2270