SAP Calculation Service

Passivent and Glidevale offer a range of products which can help reduce Dwelling Emission Rates (DER) in line with Building Regulations Approved Document L and The Code for Sustainable Homes.


Passivent offer a wide range of natural and energy efficient ventilation solutions, which can help to reduce Dwelling Emission Rates. The range includes intelligent Passive Stack Ventilation, a natural solution consuming no electricity, fully automatic and highly energy efficient intelligent Mechanical Extract systems, and low energy Possitive Input Ventilation.

Providing they are selected at the start of the calculation form, all of these DER reducing products can be incorporated into the SAP calculation for the standard fee.


Glidevale Protect reflective membrane technology can significantly and cost effectively improve the thermal performance of masonry and timber frame walls, warm roofs and floors.

Sunscoop tubular rooflights reduce the need for artificial lighting in poorly lit spaces reducing CO2 emissions.

All Glidevale loft access traps contain insulation with a Global Warming Potential of less than 5 and zero ozone depletion and comply with the air leakage requirements of BS5250.

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