PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Joyce Avenue, LONDON, N18 2TS

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 Joyce Avenue, N18 2TS 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 Joyce Avenue, LONDON, N18 2TS
Period Covered: 2008 - 30 September 2024

Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
218 Joyce Avenue
Date
15 Nov 2019
Current
Potential
71
74
Property Type
Flat
Built Form
Semi-Detached
Constructed
1983-1990
+
Certificate History
15 Nov 2019
71
74
17 Nov 2008
70
81
Total Floor Area
41 sq m
Current CO2 Emissions Level
1.6
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
220 Joyce Avenue
Date
6 Nov 2014
Current
Potential
55
72
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1930-1949
+
Certificate History
6 Nov 2014
55
72
Total Floor Area
37 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
64
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
222 Joyce Avenue
Date
21 Jul 2020
Current
Potential
69
79
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
+
Certificate History
21 Jul 2020
69
79
2 Sep 2009
66
73
Total Floor Area
41 sq m
Current CO2 Emissions Level
1.8
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
44
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
226 Joyce Avenue
Date
14 Dec 2015
Current
Potential
60
71
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
+
Certificate History
14 Dec 2015
60
71
Total Floor Area
91 sq m
Current CO2 Emissions Level
4.2
Potential CO2 Emissions Level
2.8
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
228 Joyce Avenue
Date
27 Mar 2015
Current
Potential
69
82
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
27 Mar 2015
69
82
21 Aug 2009
72
81
Total Floor Area
80 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
230 Joyce Avenue
Date
30 May 2016
Current
Potential
63
77
Property Type
Flat
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
30 May 2016
63
77
Total Floor Area
39 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
56
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
232 Joyce Avenue
Date
29 Jan 2020
Current
Potential
69
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
29 Jan 2020
69
78
Total Floor Area
39 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
234 Joyce Avenue
Date
6 Nov 2014
Current
Potential
72
76
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
6 Nov 2014
72
76
Total Floor Area
43 sq m
Current CO2 Emissions Level
1.6
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
238 Joyce Avenue
Date
5 Feb 2014
Current
Potential
58
73
Property Type
Flat
Built Form
Enclosed Mid-Terrace
Constructed
1950-1966
+
Certificate History
5 Feb 2014
58
73
Total Floor Area
80 sq m
Current CO2 Emissions Level
4.1
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
51
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
240 Joyce Avenue
Date
21 Mar 2014
Current
Potential
70
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
21 Mar 2014
70
81
Total Floor Area
87 sq m
Current CO2 Emissions Level
2.9
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
242 Joyce Avenue
Date
6 May 2014
Current
Potential
64
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
6 May 2014
64
79
Total Floor Area
42 sq m
Current CO2 Emissions Level
2.2
Potential CO2 Emissions Level
0.9
CO2 per sq m per Year
52
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
244 Joyce Avenue
Date
9 May 2010
Current
Potential
68
69
Property Type
Flat
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
9 May 2010
68
69
Total Floor Area
40 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
2.3
CO2 per sq m per Year
58
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
246 Joyce Avenue
Date
25 Apr 2010
Current
Potential
71
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
25 Apr 2010
71
79
Total Floor Area
42 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
50
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
250 Joyce Avenue
Date
30 Oct 2014
Current
Potential
52
74
Property Type
Flat
Built Form
Semi-Detached
Constructed
1967-1975
+
Certificate History
30 Oct 2014
52
74
Total Floor Area
72 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
61
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
252 Joyce Avenue
Date
16 Nov 2021
Current
Potential
74
80
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
+
Certificate History
16 Nov 2021
74
80
4 Feb 2011
64
67
Total Floor Area
89 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
27
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
256 Joyce Avenue
Date
6 Mar 2014
Current
Potential
74
80
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
6 Mar 2014
74
80
Total Floor Area
60 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
28
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
260 Joyce Avenue
Date
2 Jan 2018
Current
Potential
68
78
Property Type
Flat
Built Form
Mid-Terrace
Constructed
N/A
+
Certificate History
2 Jan 2018
68
78
Total Floor Area
51 sq m
Current CO2 Emissions Level
2.0
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
262 Joyce Avenue
Date
19 Aug 2023
Current
Potential
76
78
Property Type
Flat
Built Form
End-Terrace
Constructed
1967-1975
+
Certificate History
19 Aug 2023
76
78
24 Feb 2012
69
73
13 May 2009
72
72
Total Floor Area
72 sq m
Current CO2 Emissions Level
1.9
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
26
Mains Gas Available
Yes
Habitable Rooms
2
Number of Extensions
0
Address
264 Joyce Avenue
Date
13 Nov 2008
Current
Potential
73
75
Property Type
Maisonette
Built Form
End-Terrace
Constructed
1967-1975
+
Certificate History
13 Nov 2008
73
75
Total Floor Area
64 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
266 Joyce Avenue
Date
29 Oct 2022
Current
Potential
80
82
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
29 Oct 2022
80
82
3 Feb 2012
77
77
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.3
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
19
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
268 Joyce Avenue
Date
24 Jun 2014
Current
Potential
78
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
24 Jun 2014
78
81
24 Feb 2012
70
72
Total Floor Area
69 sq m
Current CO2 Emissions Level
1.6
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
23
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
270 Joyce Avenue
Date
29 Jul 2022
Current
Potential
80
83
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
29 Jul 2022
80
83
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.4
Potential CO2 Emissions Level
1.0
CO2 per sq m per Year
20
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
274 Joyce Avenue
Date
25 Feb 2022
Current
Potential
80
82
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
25 Feb 2022
80
82
1 Mar 2012
76
80
2 Aug 2011
79
82
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.3
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
19
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
276 Joyce Avenue
Date
15 Mar 2018
Current
Potential
78
81
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
15 Mar 2018
78
81
24 Feb 2012
76
78
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
22
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
278 Joyce Avenue
Date
21 Mar 2011
Current
Potential
71
79
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
21 Mar 2011
71
79
Total Floor Area
70 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
280 Joyce Avenue
Date
13 Jun 2024
Current
Potential
79
81
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
13 Jun 2024
79
81
30 May 2013
77
81
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
22
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
282 Joyce Avenue
Date
5 Jan 2017
Current
Potential
69
78
Property Type
Maisonette
Built Form
End-Terrace
Constructed
1967-1975
+
Certificate History
5 Jan 2017
69
78
1 Mar 2012
66
75
Total Floor Area
68 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
284 Joyce Avenue
Date
1 May 2017
Current
Potential
44
63
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
+
Certificate History
1 May 2017
44
63
31 Aug 2016
50
78
Total Floor Area
69 sq m
Current CO2 Emissions Level
6.0
Potential CO2 Emissions Level
4.8
CO2 per sq m per Year
87
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
0
Address
288 Joyce Avenue
Date
1 Dec 2023
Current
Potential
70
81
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
1 Dec 2023
70
81
Total Floor Area
65 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
1
Address
292 Joyce Avenue
Date
7 Feb 2018
Current
Potential
80
80
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
7 Feb 2018
80
80
24 Feb 2012
74
78
26 Jan 2011
84
86
Total Floor Area
71 sq m
Current CO2 Emissions Level
1.3
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
19
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
296 Joyce Avenue
Date
14 May 2023
Current
Potential
75
77
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
14 May 2023
75
77
17 Apr 2013
77
81
Total Floor Area
57 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
29
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
298 Joyce Avenue
Date
22 Dec 2018
Current
Potential
77
80
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
22 Dec 2018
77
80
24 Feb 2012
79
81
Total Floor Area
72 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
24
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
300 Joyce Avenue
Date
10 Jun 2020
Current
Potential
79
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
10 Jun 2020
79
81
24 May 2011
53
68
Total Floor Area
69 sq m
Current CO2 Emissions Level
1.5
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
21
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
302 Joyce Avenue
Date
3 Feb 2012
Current
Potential
67
74
Property Type
Maisonette
Built Form
N/A
Constructed
1950-1966
+
Certificate History
3 Feb 2012
67
74
Total Floor Area
66 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
42
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
304 Joyce Avenue
Date
27 Feb 2012
Current
Potential
80
80
Property Type
Flat
Built Form
End-Terrace
Constructed
1967-1975
+
Certificate History
27 Feb 2012
80
80
Total Floor Area
100 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
20
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
308 Joyce Avenue
Date
9 Feb 2012
Current
Potential
69
75
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1930-1949
+
Certificate History
9 Feb 2012
69
75
Total Floor Area
60 sq m
Current CO2 Emissions Level
2.4
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
310 Joyce Avenue
Date
29 Dec 2016
Current
Potential
72
77
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
29 Dec 2016
72
77
Total Floor Area
70 sq m
Current CO2 Emissions Level
2.1
Potential CO2 Emissions Level
1.7
CO2 per sq m per Year
30
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
312 Joyce Avenue
Date
9 Jun 2016
Current
Potential
70
83
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
9 Jun 2016
70
83
16 Jan 2015
74
80
Total Floor Area
68 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
39
Mains Gas Available
No
Habitable Rooms
3
Number of Extensions
0
Address
314 Joyce Avenue
Date
20 May 2014
Current
Potential
77
81
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
20 May 2014
77
81
Total Floor Area
66 sq m
Current CO2 Emissions Level
1.6
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
25
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
318 Joyce Avenue
Date
4 Apr 2022
Current
Potential
79
79
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1976-1982
+
Certificate History
4 Apr 2022
79
79
25 Oct 2010
76
86
Total Floor Area
67 sq m
Current CO2 Emissions Level
1.4
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
21
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
324 Joyce Avenue
Date
17 Nov 2016
Current
Potential
62
64
Property Type
Flat
Built Form
End-Terrace
Constructed
1967-1975
+
Certificate History
17 Nov 2016
62
64
Total Floor Area
67 sq m
Current CO2 Emissions Level
3.2
Potential CO2 Emissions Level
2.9
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
326 Joyce Avenue
Date
10 May 2018
Current
Potential
68
80
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
10 May 2018
68
80
Total Floor Area
70 sq m
Current CO2 Emissions Level
2.6
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
328 Joyce Avenue
Date
8 Jun 2020
Current
Potential
75
80
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
8 Jun 2020
75
80
5 May 2010
66
78
Total Floor Area
68 sq m
Current CO2 Emissions Level
1.8
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
26
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
330 Joyce Avenue
Date
1 Nov 2016
Current
Potential
69
75
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
1 Nov 2016
69
75
5 Aug 2013
69
73
Total Floor Area
70 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
1.9
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
332 Joyce Avenue
Date
1 Feb 2019
Current
Potential
73
80
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
1 Feb 2019
73
80
Total Floor Area
64 sq m
Current CO2 Emissions Level
2.0
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
31
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
334 Joyce Avenue
Date
24 Feb 2012
Current
Potential
73
73
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
24 Feb 2012
73
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
3
Number of Extensions
0
Address
336 Joyce Avenue
Date
8 Jun 2024
Current
Potential
70
80
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
8 Jun 2024
70
80
Total Floor Area
68 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
34
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
338 Joyce Avenue
Date
4 Aug 2022
Current
Potential
76
82
Property Type
Flat
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
4 Aug 2022
76
82
Total Floor Area
69 sq m
Current CO2 Emissions Level
1.7
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
25
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
342 Joyce Avenue
Date
19 Mar 2012
Current
Potential
61
63
Property Type
Flat
Built Form
End-Terrace
Constructed
1967-1975
+
Certificate History
19 Mar 2012
61
63
Total Floor Area
66 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
3.2
CO2 per sq m per Year
52
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Bands

A
92 - 100
B
81 - 91
C
69 - 80
D
55 -68
E
39 -54
F
54 -38
G
0 - 20

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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