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Local authority data · Wales

Commercial EPC & MEES data for Merthyr Tydfil

81.4% of commercial property in Merthyr Tydfil sits below EPC B. Analysis of 824 unique commercial properties on the Energy Performance of Buildings Register.

81.4%
of commercial stock below EPC B
80
over 1,000 m² and below B – the 2031 cohort
38
rated F or G – unlettable without an exemption
44 / 319
national rank by share below EPC B

The position in Merthyr Tydfil

There are 824 unique commercial properties in Merthyr Tydfil with a certificate on the Energy Performance of Buildings Register. Of those, 671 – 81.4% – are rated below EPC B, which is 5.3 percentage points worse than the England and Wales average of 76.1%.

The largest category locally is retail & financial services, and the postal towns and districts most represented are Merthyr Tydfil, Treharris, Cardiff, Merthyr, Merthyr Tidfil. Average floor area is 723 m² and the average asset rating is 74.

179 certificates in the district have expired (21.7% of the total), of which 16 were rated F or G when issued – the least comfortable position on the register, and the one owners are least likely to know about.

Key figures

Properties analysed824
Below EPC B671 (81.4%)
Below EPC E – unlettable38 (4.6%)
Over 1,000 m² and below B80
Expired certificates179 (21.7%)
Expired and below E16
Average floor area723 m²
Average asset rating74
National rank44 of 319

Band distribution

Commercial EPC band distribution – Merthyr Tydfil
BandPropertiesShareShare, shown as a barvs England & Wales
A+10.1%
-0.2
A313.8%
-0.3
B12114.7%
-4.8
C34742.1%
+8.9
D21325.8%
+0.1
E738.9%
-4.0
F273.3%
+1.4
G111.3%
-1.2

Commercial stock by sector

Commercial stock by sector
SectorPropertiesShareShare, shown as a bar
Retail & financial services34041.3%
Offices & workshops14017.0%
Restaurants, cafes & pubs11313.7%
General & special industrial617.4%
Storage & distribution425.1%
Community & day centres344.1%
Education212.5%
Assembly & leisure202.4%

Floor area – who the 2031 standard catches

The 2031 EPC B standard is expected to apply only to buildings over 1,000 m². In Merthyr Tydfil that line falls here:

Floor area distribution – the 1,000 m² line decides who is caught by the 2031 standard
Floor areaPropertiesShareShare, shown as a bar
Under 250 m²44554.0%
250–500 m²16319.8%
500–1,000 m²9611.7%
1,000–2,500 m²779.3%
2,500–10,000 m²344.1%
Over 10,000 m²91.1%

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For editors and journalists

Quote – attributable to evenEco

Analysis of the Energy Performance of Buildings Register by evenEco shows that 81.4% of commercial property in Merthyr Tydfil is rated below EPC B – the standard expected to apply to buildings over 1,000 m² from 2031. 80 buildings in the district are both over 1,000 m² and below that standard, and 38 are rated F or G, which has been below the legal minimum for letting since April 2023. Merthyr Tydfil ranks 44 of 319 local authorities in England and Wales.

Please attribute to evenEco and link to evenhub.uk/commercial/areas/merthyr-tydfil/. Figures derived from the GOV.UK Energy Performance of Buildings Register, deduplicated to the most recent certificate per property. Media enquiries: contact us.

Shareable summary – Merthyr Tydfil

Commercial EPC summary – Merthyr Tydfil, September 2026
MeasureFigure
Commercial properties analysed824
Below EPC B671 (81.4%)
Below EPC E – unlettable without exemption38 (4.6%)
Over 1,000 m² and below EPC B80
Expired certificates179 (21.7%)
Average floor area723 m²
National rank (share below EPC B)44 of 319

Common questions

How many commercial properties in Merthyr Tydfil are below EPC B?

671 of 824 – 81.4% of the commercial stock on the register. That is 5.3 percentage points worse than the England and Wales average of 76.1%.

How many buildings in Merthyr Tydfil are caught by the 2031 EPC B standard?

80 commercial buildings in Merthyr Tydfil are over 1,000 m² and currently rated below EPC B, which is the cohort the 2031 standard is aimed at.

How many commercial buildings in Merthyr Tydfil are already unlettable?

38 are rated F or G. Letting those without a registered exemption has been unlawful since 1 April 2023. A further 16 have an expired certificate that was rated F or G.

Where does Merthyr Tydfil rank nationally?

44 of 319 local authorities, ranked by the share of commercial stock below EPC B, with rank 1 being the highest share.

Local authorities with a similar profile

All 319 local authorities →

Source: GOV.UK Energy Performance of Buildings Register, deduplicated by evenEco to the most recent certificate per propertyAnalysis updated 11 September 2026 Methodology