UK office energy costs in 2026 depend on size, location, HVAC systems, lighting and equipment. A typical small office of 100 sq m uses around 15,000 to 25,000 kWh of electricity and 10,000 to 20,000 kWh of gas per year. EPC rating directly affects energy costs — a D or E rated office uses significantly more energy than a B or C rated equivalent. Energy costs are a deductible business expense for corporation tax (HMRC, DESNZ, Carbon Trust, 2026). |
Office energy costs UK 2026: per-square-metre benchmarks for SMEsUK office energy bills are dominated by HVAC, lighting and small power. Benchmark against CIBSE TM46 to find the real opportunity. 
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