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PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Herlwyn Avenue, RUISLIP, HA4 6HD

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 Herlwyn Avenue, HA4 6HD 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 Herlwyn Avenue, RUISLIP, HA4 6HD
Period Covered: 2008 - 31 October 2024

Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
12 Herlwyn Avenue
Date
29 Mar 2011
Current
Potential
46
61
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
+
Certificate History
29 Mar 2011
46
61
Total Floor Area
101 sq m
Current CO2 Emissions Level
7.0
Potential CO2 Emissions Level
5.1
CO2 per sq m per Year
70
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
1
Address
20 Herlwyn Avenue
Date
7 Sep 2023
Current
Potential
60
83
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
+
Certificate History
7 Sep 2023
60
83
Total Floor Area
129 sq m
Current CO2 Emissions Level
5.7
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
44
Mains Gas Available
Yes
Habitable Rooms
7
Number of Extensions
2
Address
24 Herlwyn Avenue
Date
26 Jan 2022
Current
Potential
60
84
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
+
Certificate History
26 Jan 2022
60
84
23 May 2010
50
63
Total Floor Area
122 sq m
Current CO2 Emissions Level
5.4
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
45
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
26 Herlwyn Avenue
Date
14 Mar 2022
Current
Potential
74
84
Property Type
House
Built Form
Semi-Detached
Constructed
1900-1929
+
Certificate History
14 Mar 2022
74
84
30 Oct 2009
42
61
Total Floor Area
159 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
25
Mains Gas Available
Yes
Habitable Rooms
8
Number of Extensions
1
Address
30 Herlwyn Avenue
Date
4 Mar 2022
Current
Potential
44
86
Property Type
Bungalow
Built Form
Detached
Constructed
1930-1949
+
Certificate History
4 Mar 2022
44
86
Total Floor Area
71 sq m
Current CO2 Emissions Level
5.4
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
75
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
42 Herlwyn Avenue
Date
21 Mar 2016
Current
Potential
42
78
Property Type
Bungalow
Built Form
Detached
Constructed
1930-1949
+
Certificate History
21 Mar 2016
42
78
7 Mar 2011
32
46
Total Floor Area
90 sq m
Current CO2 Emissions Level
6.5
Potential CO2 Emissions Level
2.2
CO2 per sq m per Year
72
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
1
Address
50 Herlwyn Avenue
Date
8 Mar 2010
Current
Potential
55
57
Property Type
Bungalow
Built Form
Detached
Constructed
1930-1949
+
Certificate History
8 Mar 2010
55
57
Total Floor Area
85 sq m
Current CO2 Emissions Level
4.5
Potential CO2 Emissions Level
4.4
CO2 per sq m per Year
53
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
6 Herlwyn Avenue
Date
2 May 2018
Current
Potential
70
79
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
+
Certificate History
2 May 2018
70
79
8 Mar 2012
72
75
5 Mar 2012
66
69
Total Floor Area
260 sq m
Current CO2 Emissions Level
7.5
Potential CO2 Emissions Level
5.2
CO2 per sq m per Year
29
Mains Gas Available
Yes
Habitable Rooms
8
Number of Extensions
3
Address
8 Herlwyn Avenue
Date
2 Sep 2013
Current
Potential
40
87
Property Type
House
Built Form
Semi-Detached
Constructed
1930-1949
+
Certificate History
2 Sep 2013
40
87
Total Floor Area
108 sq m
Current CO2 Emissions Level
7.6
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
71
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
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.

Contains public sector information licensed under the Open Government Licence v3.0.
Contains Royal Mail data © Royal Mail copyright and Database right 2025.