PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
William Street, MERTHYR TYDFIL, CF47 0RG
Introduction
Energy Performance Certificates (EPCs) are designed to tell you how efficient a building is and provides a rating between A (very efficient) and G which is inefficient. It helps to identify how costly it will be to light and heat a property and what the carbon dioxide emissions are likely to be.
An EPC needs to be provided as part of the process of selling or renting a house and should be availale as soon as the property is marketed. An EPC may only be produced by an approved domestic energy assessor and each certificate is valid for 10 years.
Additionally, an EPC will highlight potential efficiency improvements that could be made to the property, an estimated cost for implementation and the likely savings that can be made as a result. These costs and savings are for a typical household in that property and not specific to you or your family.
Certificates issued for William Street, CF47 0RG are shown below and the data are updated monthly for England and Wales and quarterly for properties in Scotland.
Data are provided by the Department for Levelling Up, Housing and Communities.
Energy Performance Certificates Generated for William Street, MERTHYR TYDFIL, CF47 0RG
Period Covered:
2008 - 31 January 2025
Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
1 William Street
Date
4 Apr 2016
Current
Potential
53
86
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
4 Apr 2016
53
86
4 Apr 2016
67
85
Total Floor Area
88 sq m
Current CO2 Emissions Level
6.1
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
69
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
10 William Street
Date
26 Jul 2020
Current
Potential
72
85
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
26 Jul 2020
72
85
Total Floor Area
96 sq m
Current CO2 Emissions Level
3.6
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
12 William Street
Date
6 Oct 2009
Current
Potential
53
70
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
6 Oct 2009
53
70
Total Floor Area
75 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
2.8
CO2 per sq m per Year
59
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
13 William Street
Date
18 Nov 2024
Current
Potential
67
88
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
18 Nov 2024
67
88
11 Jun 2019
70
89
18 Jun 2018
59
87
Total Floor Area
70 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
15 William Street
Date
27 Mar 2013
Current
Potential
71
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
27 Mar 2013
71
87
2 Nov 2012
32
86
Total Floor Area
78 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
16 William Street
Date
12 Nov 2015
Current
Potential
64
89
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
12 Nov 2015
64
89
Total Floor Area
71 sq m
Current CO2 Emissions Level
3.7
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
52
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
17 William Street
Date
13 Mar 2015
Current
Potential
57
85
Property Type
House
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
13 Mar 2015
57
85
Total Floor Area
74 sq m
Current CO2 Emissions Level
4.7
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
64
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
19 William Street
Date
30 Sep 2019
Current
Potential
65
84
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
30 Sep 2019
65
84
Total Floor Area
94 sq m
Current CO2 Emissions Level
4.5
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
1
Address
1a William Street
Date
23 May 2019
Current
Potential
57
82
Property Type
House
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
23 May 2019
57
82
11 Jun 2009
46
64
Total Floor Area
89 sq m
Current CO2 Emissions Level
5.6
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
63
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
21 William Street
Date
18 Mar 2022
Current
Potential
64
89
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
18 Mar 2022
64
89
20 Jul 2011
63
67
Total Floor Area
94 sq m
Current CO2 Emissions Level
4.7
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
50
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
3
Address
22 William Street
Date
17 Mar 2020
Current
Potential
72
90
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
17 Mar 2020
72
90
12 Jun 2013
67
88
Total Floor Area
92 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
24 William Street
Date
29 Jun 2010
Current
Potential
52
61
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
29 Jun 2010
52
61
29 Jun 2010
52
61
Total Floor Area
91 sq m
Current CO2 Emissions Level
5.1
Potential CO2 Emissions Level
4.1
CO2 per sq m per Year
57
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
24 WILLIAM STREET, TWYNYRODYN
Date
12 Feb 2021
Current
Potential
69
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
12 Feb 2021
69
87
Total Floor Area
105 sq m
Current CO2 Emissions Level
4.3
Potential CO2 Emissions Level
1.9
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
25 William Street
Date
21 Oct 2021
Current
Potential
73
87
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
21 Oct 2021
73
87
22 Jun 2010
60
64
Total Floor Area
95 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
28 William Street
Date
16 Sep 2020
Current
Potential
70
84
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
16 Sep 2020
70
84
Total Floor Area
120 sq m
Current CO2 Emissions Level
4.7
Potential CO2 Emissions Level
2.7
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
29 William Street
Date
30 Nov 2011
Current
Potential
68
71
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
30 Nov 2011
68
71
2 Jun 2011
63
75
Total Floor Area
99 sq m
Current CO2 Emissions Level
3.7
Potential CO2 Emissions Level
3.2
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
3 William Street
Date
31 Jul 2019
Current
Potential
70
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
31 Jul 2019
70
87
25 Jun 2009
62
71
Total Floor Area
76 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
42
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
32 William Street
Date
23 Jan 2015
Current
Potential
56
90
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
23 Jan 2015
56
90
Total Floor Area
82 sq m
Current CO2 Emissions Level
5.3
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
65
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
33 William Street
Date
10 Dec 2013
Current
Potential
58
83
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
10 Dec 2013
58
83
7 Jul 2013
52
77
19 Feb 2009
44
56
Total Floor Area
90 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
36 William Street
Date
8 Apr 2014
Current
Potential
58
87
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
8 Apr 2014
58
87
Total Floor Area
76 sq m
Current CO2 Emissions Level
3.6
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
38 William Street
Date
24 Nov 2022
Current
Potential
65
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
24 Nov 2022
65
88
9 Oct 2012
63
89
25 Jul 2011
62
70
Total Floor Area
93 sq m
Current CO2 Emissions Level
4.5
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
39 William Street
Date
23 Oct 2015
Current
Potential
63
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
23 Oct 2015
63
88
22 Apr 2013
46
85
Total Floor Area
100 sq m
Current CO2 Emissions Level
5.0
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
50
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
4 William Street
Date
8 Dec 2024
Current
Potential
72
90
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
8 Dec 2024
72
90
24 Jul 2014
55
86
Total Floor Area
65 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
40 William Street
Date
6 Jul 2022
Current
Potential
53
83
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Jul 2022
53
83
Total Floor Area
225 sq m
Current CO2 Emissions Level
14.0
Potential CO2 Emissions Level
4.8
CO2 per sq m per Year
60
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
2
Address
5 William Street
Date
25 Jun 2020
Current
Potential
61
85
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
25 Jun 2020
61
85
Total Floor Area
71 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
58
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
6 William Street
Date
13 Nov 2024
Current
Potential
64
83
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
13 Nov 2024
64
83
2 Sep 2009
65
72
Total Floor Area
88 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
1.9
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
8 William Street
Date
17 Aug 2021
Current
Potential
68
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
17 Aug 2021
68
87
21 Jan 2010
39
71
Total Floor Area
78 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
44
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Bands
Energy Performance Certificate Notes
There are a number of reasons that certificates are excluded from the dataset;
- The holder of the energy certificate has 'opted-out' of disclosure
- The certificate is excluded on the grounds of national security
- Certificates that are marked as 'cancelled' or 'not for issue'
Certificates are grouped together by the property reference identifier rather than the postal address with a view to showing the history of changes made to properties over time. Sometimes, one property may exist as multiple entries in the table instead and this is as a result of inconsistent building references being used on each prepared certificate.
Contains public sector information licensed under the Open Government Licence v3.0.
Contains Royal Mail data © Royal Mail copyright and Database right 2025.