U Value Calculations are used to quantify the heat transfer through a thermal element of a building (floors, walls, roofs). The amount of heat transfer depends on the thickness and thermal conductivity of each building material in a given cross-section of the thermal envelope.
Part L contains limiting U Value thresholds for all floors, walls, roofs, windows and doors. Low U Values are essential for all domestic projects to meet the Target Fabric Energy Efficiency (TFEE) threshold outlined under Part L1A 2013. The TER notional dwelling calculation against which all completed Part L1A calculations are compared against within the SAP software uses the following U Value figures in its assessment:
| External Walls | - | 0.18 W/m2K |
| Floor | - | 0.13 W/m2K |
| Party Walls | - | 0.00 W/m2K |
| Roof | - | 0.13 W/m2K |
| Windows | - | 1.40 W/m2K |
| Doors (solid) | - | 1.00 W/m2K |
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