PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Heol Islwyn, PORTH, CF39 8NR
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 Heol Islwyn, CF39 8NR 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 Heol Islwyn, PORTH, CF39 8NR
Period Covered:
2008 - 31 January 2025
Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
1 Heol Islwyn, Tonyrefail
Date
18 Nov 2023
Current
Potential
61
77
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
18 Nov 2023
61
77
Total Floor Area
58 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
58
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
10 Heol Islwyn, Tonyrefail
Date
19 Oct 2024
Current
Potential
74
88
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
19 Oct 2024
74
88
30 Apr 2016
72
86
15 Feb 2016
60
74
7 Jun 2015
64
78
Total Floor Area
72 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
11 Heol Islwyn, Tonyrefail
Date
25 Nov 2015
Current
Potential
64
108
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
25 Nov 2015
64
108
Total Floor Area
85 sq m
Current CO2 Emissions Level
3.9
Potential CO2 Emissions Level
-0.6
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
14 Heol Islwyn, Tonyrefail
Date
11 Sep 2019
Current
Potential
55
75
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
11 Sep 2019
55
75
Total Floor Area
92 sq m
Current CO2 Emissions Level
5.4
Potential CO2 Emissions Level
3.1
CO2 per sq m per Year
59
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
15 Heol Islwyn, Tonyrefail
Date
15 Jun 2024
Current
Potential
75
88
Property Type
House
Built Form
Semi-Detached
Constructed
1976-1982
Certificate History
15 Jun 2024
75
88
Total Floor Area
75 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
30
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
17 Heol Islwyn, Tonyrefail
Date
25 Nov 2023
Current
Potential
75
89
Property Type
House
Built Form
Semi-Detached
Constructed
1976-1982
Certificate History
25 Nov 2023
75
89
7 Jun 2010
65
75
Total Floor Area
78 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
29
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
18 Heol Islwyn, Tonyrefail
Date
18 Nov 2023
Current
Potential
75
89
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
18 Nov 2023
75
89
2 Oct 2023
74
87
7 Jun 2015
63
78
Total Floor Area
79 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
29
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
19 Heol Islwyn, Tonyrefail
Date
18 Nov 2023
Current
Potential
73
87
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
18 Nov 2023
73
87
Total Floor Area
74 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
2 Heol Islwyn, Tonyrefail
Date
12 Jun 2022
Current
Potential
65
78
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
12 Jun 2022
65
78
Total Floor Area
83 sq m
Current CO2 Emissions Level
3.8
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
20 Heol Islwyn, Tonyrefail
Date
24 Nov 2022
Current
Potential
74
87
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
24 Nov 2022
74
87
21 Feb 2012
41
62
Total Floor Area
89 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
29
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
21 Heol Islwyn, Tonyrefail
Date
7 Feb 2023
Current
Potential
81
83
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
7 Feb 2023
81
83
11 May 2014
57
81
Total Floor Area
94 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
21
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
1
Address
22 Heol Islwyn, Tonyrefail
Date
29 Nov 2022
Current
Potential
54
75
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
29 Nov 2022
54
75
12 Apr 2010
60
64
9 Jan 2009
43
68
Total Floor Area
101 sq m
Current CO2 Emissions Level
5.6
Potential CO2 Emissions Level
2.9
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
23 Heol Islwyn, Tonyrefail
Date
18 Jul 2014
Current
Potential
65
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
18 Jul 2014
65
85
26 Jul 2012
52
85
Total Floor Area
66 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
24 Heol Islwyn, Tonyrefail
Date
29 Apr 2016
Current
Potential
72
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
29 Apr 2016
72
85
15 Feb 2016
60
73
7 Jun 2015
64
79
Total Floor Area
86 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
25 Heol Islwyn, Tonyrefail
Date
29 Jan 2020
Current
Potential
62
79
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
29 Jan 2020
62
79
Total Floor Area
80 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
50
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
26 Heol Islwyn, Tonyrefail
Date
20 Jun 2024
Current
Potential
58
76
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
20 Jun 2024
58
76
3 Sep 2014
50
78
Total Floor Area
115 sq m
Current CO2 Emissions Level
6.0
Potential CO2 Emissions Level
3.5
CO2 per sq m per Year
52
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
1
Address
27 Heol Islwyn, Tonyrefail
Date
8 Aug 2014
Current
Potential
70
86
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
8 Aug 2014
70
86
Total Floor Area
81 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
29 Heol Islwyn, Tonyrefail
Date
15 Jun 2024
Current
Potential
74
88
Property Type
House
Built Form
Semi-Detached
Constructed
1976-1982
Certificate History
15 Jun 2024
74
88
Total Floor Area
75 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
30
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
3 Heol Islwyn, Tonyrefail
Date
5 Mar 2015
Current
Potential
53
84
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
5 Mar 2015
53
84
Total Floor Area
92 sq m
Current CO2 Emissions Level
5.7
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
62
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
31 Heol Islwyn, Tonyrefail
Date
18 Nov 2023
Current
Potential
73
87
Property Type
House
Built Form
Semi-Detached
Constructed
1976-1982
Certificate History
18 Nov 2023
73
87
Total Floor Area
75 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
32 Heol Islwyn, Tonyrefail
Date
29 Apr 2016
Current
Potential
71
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
29 Apr 2016
71
85
15 Feb 2016
58
73
7 Jun 2015
63
79
Total Floor Area
86 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
33 Heol Islwyn, Tonyrefail
Date
21 Dec 2024
Current
Potential
70
86
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
21 Dec 2024
70
86
27 Jan 2015
62
85
Total Floor Area
77 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
35 Heol Islwyn, Tonyrefail
Date
17 Sep 2013
Current
Potential
66
88
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
Certificate History
17 Sep 2013
66
88
Total Floor Area
85 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
37 Heol Islwyn, Tonyrefail
Date
10 Nov 2022
Current
Potential
73
86
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
10 Nov 2022
73
86
Total Floor Area
89 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
38 Heol Islwyn, Tonyrefail
Date
19 Oct 2024
Current
Potential
75
89
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
19 Oct 2024
75
89
30 Apr 2016
71
85
15 Feb 2016
59
73
8 Jun 2015
64
79
Total Floor Area
72 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
39 Heol Islwyn, Tonyrefail
Date
18 Nov 2023
Current
Potential
67
80
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
18 Nov 2023
67
80
Total Floor Area
77 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
4 Heol Islwyn, Tonyrefail
Date
22 Feb 2024
Current
Potential
66
80
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
22 Feb 2024
66
80
28 Jan 2016
58
78
19 Aug 2013
63
85
22 Oct 2009
46
58
Total Floor Area
87 sq m
Current CO2 Emissions Level
3.8
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
41 Heol Islwyn, Tonyrefail
Date
21 Jan 2019
Current
Potential
71
86
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
21 Jan 2019
71
86
Total Floor Area
78 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
42 Heol Islwyn, Tonyrefail
Date
11 Apr 2012
Current
Potential
60
84
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
11 Apr 2012
60
84
Total Floor Area
76 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
44
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
45 Heol Islwyn, Tonyrefail
Date
2 Sep 2014
Current
Potential
44
77
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
2 Sep 2014
44
77
Total Floor Area
107 sq m
Current CO2 Emissions Level
6.9
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
64
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
3
Address
46 Heol Islwyn, Tonyrefail
Date
15 Jun 2024
Current
Potential
73
85
Property Type
House
Built Form
Semi-Detached
Constructed
1976-1982
Certificate History
15 Jun 2024
73
85
Total Floor Area
91 sq m
Current CO2 Emissions Level
2.9
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
5 Heol Islwyn, Tonyrefail
Date
12 Jul 2023
Current
Potential
65
78
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
12 Jul 2023
65
78
Total Floor Area
84 sq m
Current CO2 Emissions Level
3.7
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
6 Heol Islwyn, Tonyrefail
Date
19 Oct 2024
Current
Potential
74
88
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
Certificate History
19 Oct 2024
74
88
9 Oct 2023
68
83
29 Apr 2016
71
86
15 Feb 2016
58
72
Total Floor Area
72 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
8 Heol Islwyn, Tonyrefail
Date
29 May 2024
Current
Potential
63
76
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
Certificate History
29 May 2024
63
76
26 Jun 2013
56
73
Total Floor Area
82 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
9 Heol Islwyn, Tonyrefail
Date
5 Aug 2014
Current
Potential
60
75
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
5 Aug 2014
60
75
Total Floor Area
92 sq m
Current CO2 Emissions Level
3.9
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
42
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
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.