PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Oxford Road, LONDON, N4 3HA

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 Oxford Road, N4 3HA 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 Oxford Road, LONDON, N4 3HA
Period Covered: 2008 - 31 January 2025

Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
1 Oxford Road
Date
13 Sep 2023
Current
Potential
63
83
Property Type
House
Built Form
End-Terrace
Constructed
1900-1929
+
Certificate History
13 Sep 2023
63
83
Total Floor Area
234 sq m
Current CO2 Emissions Level
8.5
Potential CO2 Emissions Level
3.7
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
9
Number of Extensions
1
Address
11 Oxford Road
Date
6 Jul 2009
Current
Potential
65
76
Property Type
Flat
Built Form
Semi-Detached
Constructed
1900-1929
+
Certificate History
6 Jul 2009
65
76
Total Floor Area
56 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
12a Oxford Road
Date
17 Aug 2022
Current
Potential
70
76
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
17 Aug 2022
70
76
Total Floor Area
51 sq m
Current CO2 Emissions Level
1.9
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
13 Oxford Road
Date
17 Jun 2024
Current
Potential
71
84
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
17 Jun 2024
71
84
29 Jul 2016
62
82
30 Apr 2012
51
78
Total Floor Area
167 sq m
Current CO2 Emissions Level
4.8
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
29
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
2
Address
14b Oxford Road
Date
19 Sep 2012
Current
Potential
63
75
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
19 Sep 2012
63
75
Total Floor Area
48 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
14c Oxford Road
Date
12 Sep 2019
Current
Potential
65
76
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
+
Certificate History
12 Sep 2019
65
76
20 Aug 2009
64
70
Total Floor Area
55 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
15b Oxford Road
Date
10 Jan 2013
Current
Potential
68
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
10 Jan 2013
68
79
Total Floor Area
50 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
19a Oxford Road
Date
1 Oct 2010
Current
Potential
48
69
Property Type
Flat
Built Form
Detached
Constructed
1900-1929
+
Certificate History
1 Oct 2010
48
69
Total Floor Area
56 sq m
Current CO2 Emissions Level
4.7
Potential CO2 Emissions Level
2.8
CO2 per sq m per Year
84
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
2
Address
19b Oxford Road
Date
26 Sep 2021
Current
Potential
70
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
26 Sep 2021
70
77
22 Jul 2010
71
73
Total Floor Area
44 sq m
Current CO2 Emissions Level
1.8
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
21a Oxford Road
Date
5 Mar 2015
Current
Potential
69
76
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
5 Mar 2015
69
76
30 Aug 2012
64
79
9 Dec 2008
57
70
Total Floor Area
63 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
21b Oxford Road
Date
14 Aug 2022
Current
Potential
76
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
14 Aug 2022
76
81
30 Aug 2012
64
76
Total Floor Area
52 sq m
Current CO2 Emissions Level
1.4
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
27
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
21C OXFORD ROAD
Date
4 Jul 2021
Current
Potential
70
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
4 Jul 2021
70
79
Total Floor Area
52 sq m
Current CO2 Emissions Level
1.9
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
21c Oxford Road
Date
20 May 2009
Current
Potential
61
62
Property Type
Flat
Built Form
Detached
Constructed
before 1900
+
Certificate History
20 May 2009
61
62
Total Floor Area
54 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
3.3
CO2 per sq m per Year
62
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
23a Oxford Road
Date
2 Jul 2015
Current
Potential
62
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
2 Jul 2015
62
78
Total Floor Area
58 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
49
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
23b Oxford Road
Date
10 Sep 2024
Current
Potential
68
73
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
10 Sep 2024
68
73
2 Jun 2010
64
69
Total Floor Area
127 sq m
Current CO2 Emissions Level
4.3
Potential CO2 Emissions Level
3.5
CO2 per sq m per Year
34
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
25 Oxford Road
Date
18 Dec 2023
Current
Potential
69
84
Property Type
House
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
18 Dec 2023
69
84
Total Floor Area
164 sq m
Current CO2 Emissions Level
5.2
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
2
Address
31b Oxford Road
Date
16 Oct 2018
Current
Potential
63
78
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
+
Certificate History
16 Oct 2018
63
78
Total Floor Area
47 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
31c Oxford Road
Date
25 Mar 2010
Current
Potential
37
56
Property Type
Flat
Built Form
N/A
Constructed
1900-1929
+
Certificate History
25 Mar 2010
37
56
Total Floor Area
57 sq m
Current CO2 Emissions Level
5.3
Potential CO2 Emissions Level
4.0
CO2 per sq m per Year
94
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
1
Address
6 Oxford Road
Date
6 Jul 2017
Current
Potential
61
81
Property Type
House
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
6 Jul 2017
61
81
Total Floor Area
162 sq m
Current CO2 Emissions Level
7.2
Potential CO2 Emissions Level
3.5
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
1
Address
7g Oxford Road
Date
22 Feb 2019
Current
Potential
57
57
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
22 Feb 2019
57
57
16 Oct 2008
69
72
Total Floor Area
24 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
94
Mains Gas Available
No
Habitable Rooms
1
Number of Extensions
0
Address
8a Oxford Road
Date
10 Nov 2015
Current
Potential
63
72
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
10 Nov 2015
63
72
Total Floor Area
86 sq m
Current CO2 Emissions Level
3.7
Potential CO2 Emissions Level
2.7
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
9 Oxford Road
Date
21 Jun 2009
Current
Potential
78
80
Property Type
Maisonette
Built Form
Detached
Constructed
before 1900
+
Certificate History
21 Jun 2009
78
80
Total Floor Area
118 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
2.7
CO2 per sq m per Year
23
Mains Gas Available
No
Habitable Rooms
0
Number of Extensions
0
Address
Flat 1, 10 Oxford Road
Date
10 Nov 2015
Current
Potential
64
76
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
10 Nov 2015
64
76
Total Floor Area
62 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat 1, 4 Oxford Road
Date
2 Nov 2022
Current
Potential
62
74
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
2 Nov 2022
62
74
Total Floor Area
68 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
2
Address
FLAT 2, 4 OXFORD ROAD
Date
4 Oct 2020
Current
Potential
73
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
4 Oct 2020
73
78
Total Floor Area
48 sq m
Current CO2 Emissions Level
1.6
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
34
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat 3, 10 Oxford Road
Date
10 Nov 2015
Current
Potential
56
69
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
10 Nov 2015
56
69
Total Floor Area
36 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
72
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat 4, 10 Oxford Road
Date
30 Jul 2012
Current
Potential
63
79
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
30 Jul 2012
63
79
26 Jul 2012
77
88
Total Floor Area
61 sq m
Current CO2 Emissions Level
2.9
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat A, 11 Oxford Road
Date
11 Sep 2011
Current
Potential
64
64
Property Type
Flat
Built Form
Detached
Constructed
before 1900
+
Certificate History
11 Sep 2011
64
64
Total Floor Area
52 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
Flat A, 2 Oxford Road
Date
14 May 2013
Current
Potential
62
74
Property Type
Flat
Built Form
End-Terrace
Constructed
before 1900
+
Certificate History
14 May 2013
62
74
Total Floor Area
59 sq m
Current CO2 Emissions Level
2.9
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
49
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
Flat A, 3 Oxford Road
Date
27 Apr 2023
Current
Potential
69
75
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
69
75
23 Sep 2019
67
75
2 Sep 2009
63
66
Total Floor Area
33 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat A, 5 Oxford Road
Date
27 Apr 2023
Current
Potential
69
75
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
69
75
29 Jan 2019
64
71
27 Mar 2009
68
75
Total Floor Area
33 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat A , 7 Oxford Road
Date
27 Apr 2023
Current
Potential
75
76
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
75
76
Total Floor Area
38 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
1
Number of Extensions
0
Address
Flat A, 9 Oxford Road
Date
24 Mar 2014
Current
Potential
65
76
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
24 Mar 2014
65
76
15 Mar 2013
69
77
Total Floor Area
97 sq m
Current CO2 Emissions Level
3.8
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
Flat B, 11 Oxford Road
Date
31 Oct 2016
Current
Potential
63
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
31 Oct 2016
63
81
25 Jan 2016
54
79
27 Oct 2014
58
79
11 Sep 2011
65
72
Total Floor Area
103 sq m
Current CO2 Emissions Level
4.3
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
42
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
Flat B, 2 Oxford Road
Date
14 May 2013
Current
Potential
64
78
Property Type
Flat
Built Form
End-Terrace
Constructed
before 1900
+
Certificate History
14 May 2013
64
78
Total Floor Area
61 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat B, 3 Oxford Road
Date
27 Apr 2023
Current
Potential
80
81
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
80
81
23 Sep 2019
65
72
30 Sep 2009
70
81
Total Floor Area
55 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
21
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat B, 5 Oxford Road
Date
27 Apr 2023
Current
Potential
80
81
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
80
81
23 Sep 2019
65
79
2 Sep 2009
72
78
Total Floor Area
55 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
21
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat B, 7 Oxford Road
Date
27 Apr 2023
Current
Potential
75
76
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
75
76
1 Dec 2015
64
75
Total Floor Area
38 sq m
Current CO2 Emissions Level
1.2
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
1
Number of Extensions
0
Address
Flat B, 9 Oxford Road
Date
15 Mar 2013
Current
Potential
69
78
Property Type
Flat
Built Form
End-Terrace
Constructed
1900-1929
+
Certificate History
15 Mar 2013
69
78
Total Floor Area
40 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
42
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
FLAT C, 12 OXFORD ROAD
Date
5 Mar 2021
Current
Potential
72
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1900-1929
+
Certificate History
5 Mar 2021
72
81
Total Floor Area
51 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
34
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Flat C, 3 Oxford Road
Date
27 Apr 2023
Current
Potential
75
79
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
75
79
20 May 2020
64
68
11 Apr 2011
51
59
Total Floor Area
93 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
26
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat C, 5 Oxford Road
Date
27 Apr 2023
Current
Potential
75
79
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
75
79
23 Sep 2019
53
74
3 Nov 2009
50
59
Total Floor Area
93 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
26
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
Flat C, 7 Oxford Road
Date
27 Apr 2023
Current
Potential
72
74
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
72
74
1 Dec 2015
76
78
Total Floor Area
15 sq m
Current CO2 Emissions Level
0.9
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
58
Mains Gas Available
Yes
Habitable Rooms
1
Number of Extensions
0
Address
flat D, 7 Oxford Road
Date
27 Apr 2023
Current
Potential
79
79
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
79
79
Total Floor Area
25 sq m
Current CO2 Emissions Level
0.7
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
27
Mains Gas Available
Yes
Habitable Rooms
1
Number of Extensions
0
Address
Flat E, 7 Oxford Road
Date
27 Apr 2023
Current
Potential
79
79
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
79
79
1 Dec 2015
76
78
Total Floor Area
25 sq m
Current CO2 Emissions Level
0.7
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
27
Mains Gas Available
Yes
Habitable Rooms
1
Number of Extensions
0
Address
Flat F, 7 Oxford Road
Date
27 Apr 2023
Current
Potential
79
79
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
79
79
1 Dec 2015
60
75
Total Floor Area
25 sq m
Current CO2 Emissions Level
0.7
Potential CO2 Emissions Level
0.7
CO2 per sq m per Year
27
Mains Gas Available
Yes
Habitable Rooms
1
Number of Extensions
0
Address
Flat G, 7 Oxford Road
Date
27 Apr 2023
Current
Potential
69
74
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
27 Apr 2023
69
74
Total Floor Area
31 sq m
Current CO2 Emissions Level
1.4
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
Ground Floor Flat, 4 Oxford Road
Date
23 Jan 2013
Current
Potential
64
76
Property Type
Flat
Built Form
Mid-Terrace
Constructed
before 1900
+
Certificate History
23 Jan 2013
64
76
Total Floor Area
59 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
1
Bands

A
92 - 100
B
81 - 91
C
69 - 80
D
55 -68
E
39 -54
F
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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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