Postcode district energy-performance profile
S21 EPC ratings and energy costs
Understand how homes in S21 score, what certificate-estimated energy costs look like and how much improvement the recorded recommendations suggest.
Average EPC
D 68
0.5 points below analysed national average
Rated C or above
56.0%
of analysed certificates
Potential uplift
+16
average score points
Properties represented
3K
from 3K certificates
At a glance
What the data says about S21
56.0%
rated A–C
7.6%
rated E–G
£1,068
certificate-estimated annual cost
Cost figures are averages of estimates recorded on EPCs at different dates. They are useful for comparing areas, but they are not a forecast of a current household bill.
Average EPC score in S21
EPC band distribution in S21
Certificate-estimated energy costs
| Cost Type | S21 | National Avg | Difference |
|---|---|---|---|
| Heating | £817/yr | £782/yr | ▲ £35 |
| Hot water | £158/yr | £184/yr | ▼ £26 |
| Lighting | £94/yr | £95/yr | ▼ £1 |
| Total | £1,068/yr | £1,061/yr | ▲ £7 |
These values come from certificate assessments and reflect standardised occupancy assumptions and energy prices used when each EPC was produced. They are not live tariffs.
Property types in the dataset
Main heating fuel
Carbon emissions and improvement potential
3.2 t
current annual CO₂ estimate
1.7 t
potential annual estimate
83 m²
average floor area
When the represented homes were built
Average EPC score over time
- 2020
- 65
- 2021
- 66
- 2022
- 64
- 2023
- 67
- 2024
- 69
- 2025
- 70