EPC Ratings in Hertfordshire
County — 201,613 Energy Performance Certificates on record
Key Insights
Properties here could improve by an average of 12 points — from C to B with recommended upgrades.
CO₂ emissions could be reduced by 1.4 tonnes per property per year — a 44% reduction with energy improvements.
58% of properties are houses — the most common type in Hertfordshire.
Most properties were built 1950-1966 (24%). Older buildings typically have lower EPC ratings due to poorer insulation standards.
46% of properties are owner-occupied — a significant rental market exists here.
EPC Rating
Hertfordshire is 1.5 points better than the national average (D, 68.5/100).
Rating Distribution
Average Annual Energy Costs
| Cost Type | Hertfordshire | National Avg | Difference |
|---|---|---|---|
| Heating | £751/yr | £782/yr | ▼ £31 |
| Hot water | £189/yr | £184/yr | ▲ £5 |
| Lighting | £95/yr | £95/yr | — |
| Total | £1,036/yr | £1,061/yr | ▼ £25 |
Property Types
Main Heating Fuel
CO₂ Emissions
Average floor area: 87 m²
Construction Age
Efficiency Trend Over Time
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Hertfordshire has 201,613 Energy Performance Certificates on record, covering 191,279 properties. The average EPC rating is C with an efficiency score of 70 out of 100. Annual energy costs average £1,036, comprising £751 for heating, £189 for hot water and £95 for lighting. Average CO₂ emissions are 3.2 tonnes per year.