Postcode district energy-performance profile
SM3 EPC ratings and energy costs
Understand how homes in SM3 score, what certificate-estimated energy costs look like and how much improvement the recorded recommendations suggest.
Average EPC
D 65
3.5 points below analysed national average
Rated C or above
38.8%
of analysed certificates
Potential uplift
+16
average score points
Properties represented
2K
from 2K certificates
At a glance
What the data says about SM3
38.8%
rated A–C
12.5%
rated E–G
£1,088
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 SM3
EPC band distribution in SM3
Certificate-estimated energy costs
| Cost Type | SM3 | National Avg | Difference |
|---|---|---|---|
| Heating | £808/yr | £782/yr | ▲ £26 |
| Hot water | £184/yr | £184/yr | — |
| Lighting | £96/yr | £95/yr | ▲ £1 |
| Total | £1,088/yr | £1,061/yr | ▲ £27 |
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
3.5 t
current annual CO₂ estimate
1.7 t
potential annual estimate
87 m²
average floor area
When the represented homes were built
Average EPC score over time
- 2020
- 63
- 2021
- 63
- 2022
- 65
- 2023
- 66
- 2024
- 66
- 2025
- 67