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PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Blackthorn Road, WELWYN GARDEN CITY, AL7 3JS

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 Blackthorn Road, AL7 3JS 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 Blackthorn Road, WELWYN GARDEN CITY, AL7 3JS
Period Covered: 2008 - 31 January 2025

Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
10 Blackthorn Road
Date
23 Feb 2014
Current
Potential
64
89
Property Type
House
Built Form
Mid-Terrace
Constructed
1950-1966
+
Certificate History
23 Feb 2014
64
89
Total Floor Area
90 sq m
Current CO2 Emissions Level
3.7
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
12 Blackthorn Road
Date
14 Sep 2014
Current
Potential
60
82
Property Type
House
Built Form
End-Terrace
Constructed
1950-1966
+
Certificate History
14 Sep 2014
60
82
Total Floor Area
92 sq m
Current CO2 Emissions Level
3.9
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
43
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
16 Blackthorn Road
Date
5 May 2010
Current
Potential
63
75
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
5 May 2010
63
75
Total Floor Area
92 sq m
Current CO2 Emissions Level
4.5
Potential CO2 Emissions Level
2.9
CO2 per sq m per Year
49
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
16 BLACKTHORN ROAD, WELWYN GARDEN CITY
Date
20 Oct 2020
Current
Potential
72
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
20 Oct 2020
72
85
Total Floor Area
88 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
6
Number of Extensions
0
Address
2 Blackthorn Road
Date
20 Mar 2009
Current
Potential
57
76
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
20 Mar 2009
57
76
Total Floor Area
97 sq m
Current CO2 Emissions Level
5.3
Potential CO2 Emissions Level
2.9
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
6
Number of Extensions
0
Address
20 Blackthorn Road
Date
6 Jun 2024
Current
Potential
63
76
Property Type
House
Built Form
Detached
Constructed
1950-1966
+
Certificate History
6 Jun 2024
63
76
Total Floor Area
86 sq m
Current CO2 Emissions Level
4.0
Potential CO2 Emissions Level
2.6
CO2 per sq m per Year
47
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
22 Blackthorn Road
Date
10 Nov 2021
Current
Potential
55
83
Property Type
House
Built Form
Detached
Constructed
1950-1966
+
Certificate History
10 Nov 2021
55
83
Total Floor Area
80 sq m
Current CO2 Emissions Level
4.4
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
55
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
24 Blackthorn Road
Date
22 Nov 2024
Current
Potential
70
84
Property Type
House
Built Form
Detached
Constructed
1950-1966
+
Certificate History
22 Nov 2024
70
84
19 Jun 2019
55
84
Total Floor Area
86 sq m
Current CO2 Emissions Level
3.1
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
26 Blackthorn Road
Date
27 Jan 2022
Current
Potential
53
78
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
27 Jan 2022
53
78
Total Floor Area
86 sq m
Current CO2 Emissions Level
5.3
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
61
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
28 Blackthorn Road
Date
6 Jun 2024
Current
Potential
72
84
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
+
Certificate History
6 Jun 2024
72
84
Total Floor Area
106 sq m
Current CO2 Emissions Level
3.4
Potential CO2 Emissions Level
1.9
CO2 per sq m per Year
32
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
4 Blackthorn Road
Date
20 Feb 2024
Current
Potential
62
81
Property Type
House
Built Form
Semi-Detached
Constructed
1967-1975
+
Certificate History
20 Feb 2024
62
81
20 Feb 2024
67
85
Total Floor Area
105 sq m
Current CO2 Emissions Level
4.8
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
46
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
6 Blackthorn Road
Date
16 Mar 2023
Current
Potential
71
84
Property Type
House
Built Form
End-Terrace
Constructed
1950-1966
+
Certificate History
16 Mar 2023
71
84
1 Dec 2010
73
76
Total Floor Area
94 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
30
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
8 Blackthorn Road
Date
21 Sep 2009
Current
Potential
72
79
Property Type
House
Built Form
Mid-Terrace
Constructed
1967-1975
+
Certificate History
21 Sep 2009
72
79
Total Floor Area
114 sq m
Current CO2 Emissions Level
3.5
Potential CO2 Emissions Level
2.7
CO2 per sq m per Year
34
Mains Gas Available
Yes
Habitable Rooms
5
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.

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