The fourth Guidance Report in the series is based on a steel framed office in London, One Kingdom Street.

Key findings of the study include:

• A package of compatible, cost-effective energy efficiency measures and LZC technologies are possible that would yield a 79% reduction in regulated emissions relative to the Part L 2006 compliant base case office building, but would incur a capital cost increase of £4,594,851 (+7.4%)
• Lighting represents around a quarter of the total operational carbon emissions for the base case office building, therefore, efficient lighting coupled with optimum glazing and solar shading design were key to achieving significant operational carbon reductions cost effectively
• The effect of exposing the thermal mass in the upper floors on operational carbon emissions was assessed by removing the suspended ceilings. The difference in regulated carbon emissions between a steel-frame composite (One Kingdom Street) and an equivalent post-tensioned concrete building was predicted to be just 0.9%
• Relative to the base case building (steel-frame composite), an equivalent post-tensioned concrete structure office building had an 11.9% higher embodied carbon impact and was 72% heavier
• The capital cost uplift of the base case office building is 0.17% to achieve a BREEAM ‘Very Good’ rating; 0.77% to achieve an ‘Excellent’ rating and 9.83% to achieve an ‘Outstanding’ rating.

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