PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
William Street, WINDSOR, SL4 1BB
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, SL4 1BB 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, WINDSOR, SL4 1BB
Period Covered:
2008 - 31 January 2025
Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
19 William Street
Date
6 Jun 2022
Current
Potential
68
74
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1996-2002
Certificate History
6 Jun 2022
68
74
8 Jul 2012
69
73
2 May 2010
65
65
Total Floor Area
55 sq m
Current CO2 Emissions Level
3.6
Potential CO2 Emissions Level
3.0
CO2 per sq m per Year
66
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
23 William Street
Date
7 Jun 2022
Current
Potential
77
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1983-1990
Certificate History
7 Jun 2022
77
81
24 Jun 2012
63
68
20 Jan 2009
37
48
Total Floor Area
53 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
43
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
0
Address
25 William Street
Date
29 Nov 2019
Current
Potential
61
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1976-1982
Certificate History
29 Nov 2019
61
78
24 Aug 2009
75
77
Total Floor Area
53 sq m
Current CO2 Emissions Level
3.5
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
66
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
27 William Street
Date
8 May 2022
Current
Potential
65
80
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1976-1982
Certificate History
8 May 2022
65
80
24 Jun 2012
67
71
Total Floor Area
65 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
63
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
0
Address
Flat 1, 1 William Street
Date
21 Jul 2022
Current
Potential
79
79
Property Type
Flat
Built Form
Enclosed End-Terrace
Constructed
2007-2011
Certificate History
21 Jul 2022
79
79
10 Nov 2011
76
76
Total Floor Area
81 sq m
Current CO2 Emissions Level
1.8
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
22
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat 1 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
56
56
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
56
56
Total Floor Area
62 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
3.3
CO2 per sq m per Year
52
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 10, Mulberry House
Date
26 Jan 2024
Current
Potential
64
72
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1967-1975
Certificate History
26 Jan 2024
64
72
26 Jan 2024
63
72
Total Floor Area
52 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
42
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 10 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
67
67
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
67
67
Total Floor Area
50 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
44
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 11 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
64
64
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
64
64
Total Floor Area
50 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
47
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 12, Mulberry House
Date
19 Dec 2023
Current
Potential
82
83
Property Type
Flat
Built Form
Mid-Terrace
Constructed
2012 onwards
Certificate History
19 Dec 2023
82
83
Total Floor Area
42 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
29
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 12 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
65
65
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
65
65
Total Floor Area
42 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
49
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 19, William Street
Date
16 Aug 2023
Current
Potential
66
68
Property Type
Flat
Built Form
End-Terrace
Constructed
1983-1990
Certificate History
16 Aug 2023
66
68
Total Floor Area
65 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
3.7
CO2 per sq m per Year
63
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 2, 1 William Street
Date
3 Apr 2022
Current
Potential
83
83
Property Type
Flat
Built Form
Mid-Terrace
Constructed
2007-2011
Certificate History
3 Apr 2022
83
83
10 Nov 2011
75
75
Total Floor Area
67 sq m
Current CO2 Emissions Level
1.1
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
16
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat 2, Mulberry House
Date
3 Jan 2024
Current
Potential
51
53
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1983-1990
Certificate History
3 Jan 2024
51
53
Total Floor Area
65 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
3.2
CO2 per sq m per Year
51
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 2 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
67
67
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
67
67
Total Floor Area
65 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
39
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 27, William Street
Date
16 Aug 2023
Current
Potential
71
76
Property Type
Flat
Built Form
End-Terrace
Constructed
1983-1990
Certificate History
16 Aug 2023
71
76
Total Floor Area
65 sq m
Current CO2 Emissions Level
3.5
Potential CO2 Emissions Level
3.1
CO2 per sq m per Year
54
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
0
Address
Flat 3, 1 William Street
Date
31 Mar 2022
Current
Potential
81
82
Property Type
Flat
Built Form
Enclosed End-Terrace
Constructed
1991-1995
Certificate History
31 Mar 2022
81
82
19 Jan 2012
82
84
10 Nov 2011
76
76
Total Floor Area
82 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
18
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat 3, Mulberry House
Date
28 Apr 2024
Current
Potential
53
56
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
Certificate History
28 Apr 2024
53
56
Total Floor Area
52 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
54
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 3 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
59
59
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
59
59
Total Floor Area
55 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
2.8
CO2 per sq m per Year
51
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 4, 1 William Street
Date
21 Jul 2022
Current
Potential
82
83
Property Type
Flat
Built Form
Semi-Detached
Constructed
2007-2011
Certificate History
21 Jul 2022
82
83
10 Nov 2011
75
75
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
17
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat 4 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
57
57
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
57
57
Total Floor Area
44 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
59
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 5, 1, William Street
Date
10 Nov 2011
Current
Potential
73
73
Property Type
Flat
Built Form
End-Terrace
Constructed
N/A
Certificate History
10 Nov 2011
73
73
Total Floor Area
0 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
3.2
CO2 per sq m per Year
30
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 5, Mulberry House
Date
4 Dec 2023
Current
Potential
60
72
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1976-1982
Certificate History
4 Dec 2023
60
72
Total Floor Area
56 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
44
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 5 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
64
64
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
64
64
Total Floor Area
58 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
44
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 6, Mulberry House
Date
20 Jun 2024
Current
Potential
77
79
Property Type
Flat
Built Form
Semi-Detached
Constructed
2012 onwards
Certificate History
20 Jun 2024
77
79
Total Floor Area
63 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
24
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
1
Address
Flat 6 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
66
66
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
66
66
Total Floor Area
62 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
41
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 7 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
67
67
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
67
67
Total Floor Area
55 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
41
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 8, Mulberry House
Date
30 Jul 2024
Current
Potential
73
75
Property Type
Flat
Built Form
Mid-Terrace
Constructed
2012 onwards
Certificate History
30 Jul 2024
73
75
Total Floor Area
45 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
33
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 8 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
66
66
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
66
66
Total Floor Area
44 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
48
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 9 Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
59
59
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
59
59
Total Floor Area
46 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
56
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
The Penthouse, 1 William Street
Date
15 Dec 2021
Current
Potential
80
81
Property Type
Flat
Built Form
Semi-Detached
Constructed
2007-2011
Certificate History
15 Dec 2021
80
81
Total Floor Area
102 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
19
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
The Penthouse Mulberry House, 3, William Street
Date
29 Jan 2014
Current
Potential
77
77
Property Type
Flat
Built Form
Detached
Constructed
N/A
Certificate History
29 Jan 2014
77
77
Total Floor Area
114 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
22
Mains Gas Available
No
Habitable Rooms
0
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.