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Area Weighted U-Value Calculator |
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Project Addess |
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Actual Extension |
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Net Area (m²) |
U-value (w/m²k) |
Heat Loss (W) |
Proportion of Total |
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External Walls |
- |
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Roof - Insulation at rafters |
- |
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Roof - Flat Roof |
- |
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Roof - Insulation at joists |
- |
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Ground Floor |
- |
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Windows |
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Roof Windows |
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Doors |
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Totals |
- |
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Area weighted U-value |
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Notional Allowance Calculator |
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Floor Area of Extension |
m² |
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25% of extension floor area |
m² |
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Area of openings removed as a result of the extension |
m² |
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Total Glazing Allowance |
m² |
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Notional Extension |
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Net Area (m²) |
U-value (w/m²k) |
Heat Loss (W) |
Proportion of Total |
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External Walls |
0.28 |
- |
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Roof - Insulation at rafters |
0.18 |
- |
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Roof - Flat Roof |
0.18 |
- |
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Roof - Insulation at joists |
0.16 |
- |
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Ground Floor |
0.22 |
- |
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Windows |
1.60 |
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Roof Windows |
1.60 |
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Doors |
1.80 |
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Totals |
- |
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Area weighted U-value |
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Compliance Results |
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Part 1 - Paragraph 4.1, AD L1B 2013 (England) |
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External Wall u-value compliant? |
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Slope Roof u-value compliant? |
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Flat Roof u-value compliant? |
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Plane Roof u-value compliant? |
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Ground Floor u-value compliant? |
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Window u-value compliant? |
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Roof Window u-value compliant? |
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Door u-value compliant? |
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Part 2 - Paragraph 4.5, AD L1B 2013 (England) |
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Actual area weighted u-value |
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Notional area weighted u-value |
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Compliance Achieved? |
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This online tool gives an indication of how an extension could comply using the Area Weighted U-Value Method Described in Building Regulations Part L1b. Briary Energy supply this tool FOC to help homeowners and architects design buildings to comply with Part L. |
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