PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Cathays Terrace, CARDIFF, CF24 4HU
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 Cathays Terrace, CF24 4HU 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 Cathays Terrace, CARDIFF, CF24 4HU
Period Covered:
2008 - 31 October 2024
Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
107 Cathays Terrace
Date
6 Sep 2018
Current
Potential
50
75
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Sep 2018
50
75
1 Oct 2008
57
62
Total Floor Area
124 sq m
Current CO2 Emissions Level
7.0
Potential CO2 Emissions Level
3.3
CO2 per sq m per Year
56
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
2
Address
109 Cathays Terrace
Date
19 Mar 2018
Current
Potential
61
83
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
19 Mar 2018
61
83
Total Floor Area
138 sq m
Current CO2 Emissions Level
5.8
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
42
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
1
Address
111 Cathays Terrace
Date
24 Feb 2014
Current
Potential
51
82
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
24 Feb 2014
51
82
Total Floor Area
139 sq m
Current CO2 Emissions Level
7.3
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
53
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
1
Address
113 Cathays Terrace
Date
6 Sep 2018
Current
Potential
42
73
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Sep 2018
42
73
2 Dec 2008
48
64
Total Floor Area
137 sq m
Current CO2 Emissions Level
9.0
Potential CO2 Emissions Level
3.9
CO2 per sq m per Year
66
Mains Gas Available
Yes
Habitable Rooms
8
Number of Extensions
1
Address
115 Cathays Terrace
Date
20 Sep 2017
Current
Potential
68
86
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
20 Sep 2017
68
86
5 Dec 2008
57
70
Total Floor Area
140 sq m
Current CO2 Emissions Level
4.7
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
0
Address
119 Cathays Terrace
Date
7 Oct 2012
Current
Potential
67
84
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
7 Oct 2012
67
84
Total Floor Area
156 sq m
Current CO2 Emissions Level
5.2
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
8
Number of Extensions
1
Address
121 Cathays Terrace
Date
10 Jan 2019
Current
Potential
65
76
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
10 Jan 2019
65
76
13 Jan 2009
46
68
Total Floor Area
164 sq m
Current CO2 Emissions Level
6.0
Potential CO2 Emissions Level
4.0
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
8
Number of Extensions
1
Address
123a Cathays Terrace
Date
12 Sep 2018
Current
Potential
66
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
12 Sep 2018
66
77
Total Floor Area
101 sq m
Current CO2 Emissions Level
3.8
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
2
Address
123b Cathays Terrace
Date
12 Sep 2018
Current
Potential
61
64
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
12 Sep 2018
61
64
Total Floor Area
61 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
2.8
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
123c Cathays Terrace
Date
11 Mar 2011
Current
Potential
44
44
Property Type
Flat
Built Form
Enclosed End-Terrace
Constructed
before 1900
Certificate History
11 Mar 2011
44
44
Total Floor Area
21 sq m
Current CO2 Emissions Level
3.6
Potential CO2 Emissions Level
3.6
CO2 per sq m per Year
170
Mains Gas Available
No
Habitable Rooms
1
Number of Extensions
0
Address
123C CATHAYS TERRACE, CATHAYS
Date
12 Mar 2021
Current
Potential
63
76
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
12 Mar 2021
63
76
Total Floor Area
21 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
101
Mains Gas Available
No
Habitable Rooms
1
Number of Extensions
0
Address
125 Cathays Terrace
Date
9 Feb 2009
Current
Potential
65
74
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
Certificate History
9 Feb 2009
65
74
9 Feb 2009
75
79
Total Floor Area
125 sq m
Current CO2 Emissions Level
5.1
Potential CO2 Emissions Level
3.8
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
129 Cathays Terrace
Date
28 May 2020
Current
Potential
51
80
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
28 May 2020
51
80
Total Floor Area
181 sq m
Current CO2 Emissions Level
9.5
Potential CO2 Emissions Level
3.5
CO2 per sq m per Year
53
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
131 Cathays Terrace
Date
28 May 2020
Current
Potential
62
86
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
28 May 2020
62
86
24 Jun 2010
49
65
Total Floor Area
160 sq m
Current CO2 Emissions Level
6.5
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
133 Cathays Terrace
Date
14 Oct 2018
Current
Potential
74
80
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
14 Oct 2018
74
80
13 Nov 2008
41
56
Total Floor Area
162 sq m
Current CO2 Emissions Level
4.2
Potential CO2 Emissions Level
3.2
CO2 per sq m per Year
26
Mains Gas Available
Yes
Habitable Rooms
9
Number of Extensions
1
Address
135 Cathays Terrace
Date
21 Feb 2018
Current
Potential
65
85
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
21 Feb 2018
65
85
31 Jan 2013
36
75
Total Floor Area
126 sq m
Current CO2 Emissions Level
4.7
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
139a Cathays Terrace
Date
5 Jul 2015
Current
Potential
71
86
Property Type
House
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
5 Jul 2015
71
86
29 Nov 2009
57
62
Total Floor Area
136 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
30
Mains Gas Available
Yes
Habitable Rooms
9
Number of Extensions
1
Address
139b Cathays Terrace
Date
7 Oct 2024
Current
Potential
78
86
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
7 Oct 2024
78
86
23 Jun 2014
60
75
Total Floor Area
152 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
21
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
1
Address
139c Cathays Terrace
Date
26 Feb 2019
Current
Potential
69
86
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
26 Feb 2019
69
86
3 Mar 2009
46
59
Total Floor Area
90 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
1
Address
139d Cathays Terrace
Date
16 Mar 2016
Current
Potential
52
75
Property Type
Flat
Built Form
End-Terrace
Constructed
before 1900
Certificate History
16 Mar 2016
52
75
Total Floor Area
45 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
69
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Annex, 127 Cathays Terrace
Date
5 Oct 2022
Current
Potential
65
95
Property Type
House
Built Form
Semi-Detached
Constructed
2012 onwards
Certificate History
5 Oct 2022
65
95
Total Floor Area
45 sq m
Current CO2 Emissions Level
1.8
Potential CO2 Emissions Level
0.6
CO2 per sq m per Year
41
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
0
Address
Annexe, 139d Cathays Terrace
Date
15 Sep 2020
Current
Potential
59
73
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
15 Sep 2020
59
73
15 Sep 2020
59
73
Total Floor Area
40 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
62
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Basement Flat, 117 Cathays Terrace
Date
27 Sep 2024
Current
Potential
71
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
27 Sep 2024
71
77
Total Floor Area
37 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
53
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
BASEMENT FLAT, 117 CATHAYS TERRACE
Date
24 Nov 2020
Current
Potential
68
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
24 Nov 2020
68
77
Total Floor Area
36 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
60
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Basement Flat, 119, Cathays Terrace
Date
8 May 2016
Current
Potential
71
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
8 May 2016
71
77
Total Floor Area
36 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
First Floor Flat, 117 Cathays Terrace
Date
8 Mar 2024
Current
Potential
70
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
8 Mar 2024
70
81
7 Nov 2023
72
81
Total Floor Area
60 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
Flat 1, 105a Cathays Terrace
Date
6 Nov 2018
Current
Potential
68
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Nov 2018
68
77
2 Apr 2010
44
76
Total Floor Area
60 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
Flat 1, 125 Cathays Terrace
Date
6 Oct 2016
Current
Potential
77
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Oct 2016
77
77
Total Floor Area
87 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
24
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
Flat 1, 127 Cathays Terrace
Date
21 May 2020
Current
Potential
47
65
Property Type
Flat
Built Form
Semi-Detached
Constructed
1900-1929
Certificate History
21 May 2020
47
65
19 Sep 2017
19
63
Total Floor Area
48 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
3.0
CO2 per sq m per Year
67
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
1
Address
Flat 1 139D Cathays Terrace
Date
15 Sep 2020
Current
Potential
74
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
15 Sep 2020
74
77
Total Floor Area
47 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
Flat 2, 105a Cathays Terrace
Date
6 Nov 2018
Current
Potential
72
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Nov 2018
72
79
2 Apr 2010
42
75
Total Floor Area
58 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
34
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
Flat 2, 119 Cathays Terrace
Date
9 May 2016
Current
Potential
71
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
9 May 2016
71
78
Total Floor Area
59 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
1
Address
Flat 2, 125 Cathays Terrace
Date
6 Oct 2016
Current
Potential
75
88
Property Type
House
Built Form
Mid-Terrace
Constructed
1996-2002
Certificate History
6 Oct 2016
75
88
Total Floor Area
63 sq m
Current CO2 Emissions Level
1.8
Potential CO2 Emissions Level
0.6
CO2 per sq m per Year
28
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat 2, 127 Cathays Terrace
Date
21 May 2020
Current
Potential
65
77
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1900-1929
Certificate History
21 May 2020
65
77
19 Jul 2010
26
60
Total Floor Area
32 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
52
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 2 139D Cathays Terrace
Date
15 Sep 2020
Current
Potential
60
79
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
15 Sep 2020
60
79
Total Floor Area
42 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
1
Address
Flat 3, 105a Cathays Terrace
Date
6 Nov 2018
Current
Potential
58
72
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
6 Nov 2018
58
72
2 Apr 2010
43
75
Total Floor Area
69 sq m
Current CO2 Emissions Level
3.7
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
53
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
Flat 3, 119 Cathays Terrace
Date
9 May 2016
Current
Potential
44
66
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
9 May 2016
44
66
Total Floor Area
60 sq m
Current CO2 Emissions Level
4.8
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
79
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat 3, 125 Cathays Terrace
Date
6 Oct 2016
Current
Potential
71
73
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
6 Oct 2016
71
73
Total Floor Area
71 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
Flat 3, 127 Cathays Terrace
Date
21 May 2020
Current
Potential
69
80
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1900-1929
Certificate History
21 May 2020
69
80
11 Feb 2011
15
46
Total Floor Area
22 sq m
Current CO2 Emissions Level
1.3
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
60
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 3 139D Cathays Terrace
Date
15 Sep 2020
Current
Potential
77
77
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
15 Sep 2020
77
77
Total Floor Area
47 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
26
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat 4, 105a Cathays Terrace
Date
6 Nov 2018
Current
Potential
68
77
Property Type
Flat
Built Form
Semi-Detached
Constructed
1900-1929
Certificate History
6 Nov 2018
68
77
2 Apr 2010
54
76
Total Floor Area
46 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat 4, 127 Cathays Terrace
Date
21 May 2020
Current
Potential
57
74
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1900-1929
Certificate History
21 May 2020
57
74
25 Mar 2010
28
59
Total Floor Area
18 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
95
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat 5, 127 Cathays Terrace
Date
21 May 2020
Current
Potential
57
75
Property Type
Flat
Built Form
Semi-Detached
Constructed
1900-1929
Certificate History
21 May 2020
57
75
14 Apr 2011
42
67
Total Floor Area
17 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
102
Mains Gas Available
No
Habitable Rooms
1
Number of Extensions
0
Address
Flat 6, 127 Cathays Terrace
Date
22 May 2020
Current
Potential
58
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
22 May 2020
58
78
26 Feb 2010
58
82
Total Floor Area
32 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
67
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
1
Address
Flat A, 117 Cathays Terrace
Date
6 May 2010
Current
Potential
38
56
Property Type
Flat
Built Form
Detached
Constructed
1900-1929
Certificate History
6 May 2010
38
56
Total Floor Area
28 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
86
Mains Gas Available
No
Habitable Rooms
2
Number of Extensions
0
Address
Flat B, 117 Cathays Terrace
Date
6 May 2010
Current
Potential
72
77
Property Type
Flat
Built Form
Detached
Constructed
1900-1929
Certificate History
6 May 2010
72
77
Total Floor Area
50 sq m
Current CO2 Emissions Level
2.3
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
Flat C, 117 Cathays Terrace
Date
6 May 2010
Current
Potential
74
76
Property Type
Flat
Built Form
Detached
Constructed
1900-1929
Certificate History
6 May 2010
74
76
Total Floor Area
59 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
Ground Floor Flat, 117 Cathays Terrace
Date
7 Nov 2023
Current
Potential
66
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
Certificate History
7 Nov 2023
66
79
Total Floor Area
51 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
Ground Floor Flat, 139d Cathays Terrace
Date
15 Sep 2020
Current
Potential
75
77
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
Certificate History
15 Sep 2020
75
77
15 Sep 2020
75
77
12 Nov 2009
64
73
Total Floor Area
47 sq m
Current CO2 Emissions Level
1.4
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
3
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.
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