Parliamentary constituency energy-performance profile
Cardiff South and Penarth EPC ratings and energy costs
Understand how homes in Cardiff South and Penarth score, what certificate-estimated energy costs look like and how much improvement the recorded recommendations suggest.
Average EPC
C 73
4.5 points above analysed national average
Rated C or above
70.9%
of analysed certificates
Potential uplift
+10
average score points
Properties represented
17K
from 18K certificates
At a glance
What the data says about Cardiff South and Penarth
70.9%
rated A–C
4.3%
rated E–G
£819
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 Cardiff South and Penarth
EPC band distribution in Cardiff South and Penarth
Certificate-estimated energy costs
| Cost Type | Cardiff South and Penarth | National Avg | Difference |
|---|---|---|---|
| Heating | £543/yr | £782/yr | ▼ £239 |
| Hot water | £184/yr | £184/yr | — |
| Lighting | £92/yr | £95/yr | ▼ £3 |
| Total | £819/yr | £1,061/yr | ▼ £242 |
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
2.5 t
current annual CO₂ estimate
1.4 t
potential annual estimate
76 m²
average floor area
When the represented homes were built
Average EPC score over time
- 2020
- 70
- 2021
- 73
- 2022
- 74
- 2023
- 74
- 2024
- 73