PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
William Street, SWANSEA, SA1 3QS
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, SA1 3QS 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, SWANSEA, SA1 3QS
Period Covered:
2008 - 31 January 2025
Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
12 William Street
Date
14 Jun 2015
Current
Potential
55
83
Property Type
House
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
14 Jun 2015
55
83
5 Sep 2013
61
87
Total Floor Area
73 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
15 William Street
Date
21 Jul 2015
Current
Potential
56
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
21 Jul 2015
56
88
Total Floor Area
78 sq m
Current CO2 Emissions Level
4.3
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
16 William Street
Date
19 Sep 2017
Current
Potential
62
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
19 Sep 2017
62
88
Total Floor Area
72 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
18 William Street
Date
14 Jun 2015
Current
Potential
64
85
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
14 Jun 2015
64
85
3 Jul 2014
63
85
26 Feb 2009
55
72
Total Floor Area
84 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
19 William Street
Date
5 Apr 2016
Current
Potential
55
74
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
5 Apr 2016
55
74
8 Jul 2015
56
77
23 Jun 2015
63
86
23 Jun 2015
63
86
Total Floor Area
75 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
53
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
20 William Street
Date
15 Apr 2015
Current
Potential
56
75
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
15 Apr 2015
56
75
Total Floor Area
86 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
2
Address
22 William Street
Date
6 Jul 2015
Current
Potential
55
86
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
6 Jul 2015
55
86
2 May 2012
57
85
Total Floor Area
93 sq m
Current CO2 Emissions Level
4.8
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
23 William Street
Date
23 Jun 2015
Current
Potential
59
80
Property Type
House
Built Form
End-Terrace
Constructed
before 1900
Certificate History
23 Jun 2015
59
80
Total Floor Area
157 sq m
Current CO2 Emissions Level
6.5
Potential CO2 Emissions Level
3.1
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
1
Address
24 William Street
Date
7 Oct 2015
Current
Potential
80
91
Property Type
House
Built Form
N/A
Constructed
N/A
Certificate History
7 Oct 2015
80
91
Total Floor Area
101 sq m
Current CO2 Emissions Level
1.9
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
18
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
24a William Street
Date
7 Oct 2015
Current
Potential
80
90
Property Type
House
Built Form
N/A
Constructed
N/A
Certificate History
7 Oct 2015
80
90
Total Floor Area
98 sq m
Current CO2 Emissions Level
1.9
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
20
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
28 William Street
Date
4 Apr 2023
Current
Potential
60
81
Property Type
House
Built Form
End-Terrace
Constructed
before 1900
Certificate History
4 Apr 2023
60
81
23 Mar 2012
53
54
Total Floor Area
66 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
50
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
29 William Street
Date
14 Jun 2017
Current
Potential
64
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
14 Jun 2017
64
88
Total Floor Area
77 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
31 William Street
Date
15 Aug 2017
Current
Potential
51
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
15 Aug 2017
51
87
1 Feb 2011
64
71
Total Floor Area
77 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
57
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
32 William Street
Date
20 Jun 2017
Current
Potential
61
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
20 Jun 2017
61
87
23 Oct 2014
64
83
Total Floor Area
73 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
2
Address
33 William Street
Date
31 Jan 2018
Current
Potential
61
74
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
31 Jan 2018
61
74
Total Floor Area
51 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
52
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
1
Address
33a William Street
Date
31 Jan 2018
Current
Potential
56
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
31 Jan 2018
56
77
Total Floor Area
53 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
61
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
34 William Street
Date
7 Jun 2018
Current
Potential
51
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
7 Jun 2018
51
87
Total Floor Area
74 sq m
Current CO2 Emissions Level
4.6
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
62
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
35 William Street
Date
15 Aug 2017
Current
Potential
59
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
15 Aug 2017
59
87
9 Jun 2010
67
69
Total Floor Area
78 sq m
Current CO2 Emissions Level
3.8
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
36 William Street
Date
4 Jan 2011
Current
Potential
55
68
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
4 Jan 2011
55
68
Total Floor Area
74 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
3.0
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
37 William Street
Date
29 Jun 2017
Current
Potential
66
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
29 Jun 2017
66
87
Total Floor Area
91 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
38 William Street
Date
19 Jul 2017
Current
Potential
61
83
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
19 Jul 2017
61
83
Total Floor Area
90 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
2
Address
41 William Street
Date
10 Oct 2017
Current
Potential
61
83
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
10 Oct 2017
61
83
Total Floor Area
74 sq m
Current CO2 Emissions Level
3.5
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
42 William Street
Date
15 Aug 2017
Current
Potential
57
86
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
15 Aug 2017
57
86
26 May 2009
63
72
Total Floor Area
105 sq m
Current CO2 Emissions Level
4.9
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
3
Address
43 William Street
Date
13 Jul 2017
Current
Potential
61
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
13 Jul 2017
61
88
25 Oct 2012
59
83
Total Floor Area
85 sq m
Current CO2 Emissions Level
3.8
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
2
Address
44 William Street
Date
20 Mar 2020
Current
Potential
66
89
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
20 Mar 2020
66
89
16 Oct 2013
44
79
Total Floor Area
74 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
0.6
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
45 William Street
Date
26 Jun 2017
Current
Potential
55
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
26 Jun 2017
55
87
4 Feb 2015
50
89
9 Jun 2010
66
69
Total Floor Area
82 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
54
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
2
Address
46 WILLIAM STREET, SANDFIELDS
Date
6 Dec 2020
Current
Potential
66
87
Property Type
House
Built Form
End-Terrace
Constructed
before 1900
Certificate History
6 Dec 2020
66
87
Total Floor Area
63 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
40
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.