PROPERTY ENERGY EFFICIENCY CERTIFICATE DETAILS
Knightsfield, WELWYN GARDEN CITY, AL8 7HD
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 Knightsfield, AL8 7HD 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 Knightsfield, WELWYN GARDEN CITY, AL8 7HD
Period Covered:
2008 - 31 January 2025
Address
Inspection Date
Current
Potential
Property Type
Built Form
Constructed
Address
104 Knightsfield
Date
22 Nov 2024
Current
Potential
64
89
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
64
89
Total Floor Area
69 sq m
Current CO2 Emissions Level
3.3
Potential CO2 Emissions Level
0.8
CO2 per sq m per Year
48
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
106 Knightsfield
Date
22 Nov 2024
Current
Potential
71
79
Property Type
Flat
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
71
79
Total Floor Area
69 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
108 Knightsfield
Date
28 Jan 2022
Current
Potential
39
76
Property Type
Maisonette
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
28 Jan 2022
39
76
Total Floor Area
67 sq m
Current CO2 Emissions Level
5.4
Potential CO2 Emissions Level
3.0
CO2 per sq m per Year
80
Mains Gas Available
No
Habitable Rooms
4
Number of Extensions
0
Address
108 KNIGHTSFIELD, WELWYN GARDEN CITY
Date
26 Oct 2020
Current
Potential
67
76
Property Type
Maisonette
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
26 Oct 2020
67
76
Total Floor Area
67 sq m
Current CO2 Emissions Level
3.6
Potential CO2 Emissions Level
3.2
CO2 per sq m per Year
53
Mains Gas Available
No
Habitable Rooms
4
Number of Extensions
0
Address
110 Knightsfield
Date
22 Nov 2024
Current
Potential
71
79
Property Type
Flat
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
71
79
28 May 2009
76
79
Total Floor Area
69 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
112 Knightsfield
Date
26 Nov 2014
Current
Potential
74
79
Property Type
Maisonette
Built Form
Mid-Terrace
Constructed
1967-1975
Certificate History
26 Nov 2014
74
79
Total Floor Area
66 sq m
Current CO2 Emissions Level
1.9
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
30
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
114 Knightsfield
Date
6 Jan 2009
Current
Potential
70
75
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
Certificate History
6 Jan 2009
70
75
Total Floor Area
68 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
2.5
CO2 per sq m per Year
41
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
116 Knightsfield
Date
22 Nov 2024
Current
Potential
71
79
Property Type
Flat
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
71
79
Total Floor Area
69 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
118 Knightsfield
Date
22 Nov 2024
Current
Potential
70
80
Property Type
Maisonette
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
70
80
Total Floor Area
69 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
4
Number of Extensions
0
Address
120 Knightsfield
Date
22 Nov 2017
Current
Potential
73
76
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
Certificate History
22 Nov 2017
73
76
Total Floor Area
71 sq m
Current CO2 Emissions Level
2.3
Potential CO2 Emissions Level
2.0
CO2 per sq m per Year
33
Mains Gas Available
Yes
Habitable Rooms
3
Number of Extensions
0
Address
122 Knightsfield
Date
11 Aug 2009
Current
Potential
73
81
Property Type
Flat
Built Form
End-Terrace
Constructed
1950-1966
Certificate History
11 Aug 2009
73
81
Total Floor Area
67 sq m
Current CO2 Emissions Level
2.5
Potential CO2 Emissions Level
1.8
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
124 Knightsfield
Date
16 Sep 2013
Current
Potential
47
84
Property Type
House
Built Form
End-Terrace
Constructed
1950-1966
Certificate History
16 Sep 2013
47
84
Total Floor Area
81 sq m
Current CO2 Emissions Level
5.3
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
65
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
128 Knightsfield
Date
27 Jan 2011
Current
Potential
59
76
Property Type
House
Built Form
Mid-Terrace
Constructed
1950-1966
Certificate History
27 Jan 2011
59
76
Total Floor Area
76 sq m
Current CO2 Emissions Level
4.3
Potential CO2 Emissions Level
2.4
CO2 per sq m per Year
57
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
130 Knightsfield
Date
22 Nov 2024
Current
Potential
71
87
Property Type
House
Built Form
Mid-Terrace
Constructed
1950-1966
Certificate History
22 Nov 2024
71
87
15 Oct 2013
72
88
Total Floor Area
77 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
134 Knightsfield
Date
22 Nov 2024
Current
Potential
70
84
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
70
84
21 Sep 2016
62
86
Total Floor Area
79 sq m
Current CO2 Emissions Level
2.9
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
136 Knightsfield
Date
5 Sep 2024
Current
Potential
75
85
Property Type
House
Built Form
Mid-Terrace
Constructed
1950-1966
Certificate History
5 Sep 2024
75
85
1 Sep 2020
53
71
Total Floor Area
100 sq m
Current CO2 Emissions Level
2.7
Potential CO2 Emissions Level
1.6
CO2 per sq m per Year
28
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
1
Address
140 Knightsfield
Date
22 Nov 2024
Current
Potential
69
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
69
85
30 May 2017
68
86
Total Floor Area
78 sq m
Current CO2 Emissions Level
3.0
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
38
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
142 Knightsfield
Date
8 Mar 2020
Current
Potential
53
79
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
8 Mar 2020
53
79
Total Floor Area
75 sq m
Current CO2 Emissions Level
4.9
Potential CO2 Emissions Level
2.1
CO2 per sq m per Year
65
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
144 Knightsfield
Date
18 Oct 2015
Current
Potential
71
88
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
18 Oct 2015
71
88
Total Floor Area
79 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.1
CO2 per sq m per Year
35
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
146 Knightsfield
Date
22 Nov 2024
Current
Potential
71
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
71
85
Total Floor Area
76 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.3
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
148 Knightsfield
Date
22 Nov 2024
Current
Potential
70
85
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
70
85
10 Jul 2019
67
83
Total Floor Area
78 sq m
Current CO2 Emissions Level
2.8
Potential CO2 Emissions Level
1.4
CO2 per sq m per Year
36
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
150 Knightsfield
Date
26 Apr 2016
Current
Potential
66
83
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
26 Apr 2016
66
83
Total Floor Area
79 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
40
Mains Gas Available
Yes
Habitable Rooms
4
Number of Extensions
0
Address
152 Knightsfield
Date
26 Apr 2015
Current
Potential
66
84
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
26 Apr 2015
66
84
Total Floor Area
78 sq m
Current CO2 Emissions Level
2.9
Potential CO2 Emissions Level
1.2
CO2 per sq m per Year
37
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
Address
154 Knightsfield
Date
22 Nov 2024
Current
Potential
68
84
Property Type
House
Built Form
Semi-Detached
Constructed
1950-1966
Certificate History
22 Nov 2024
68
84
Total Floor Area
78 sq m
Current CO2 Emissions Level
3.1
Potential CO2 Emissions Level
1.5
CO2 per sq m per Year
39
Mains Gas Available
Yes
Habitable Rooms
5
Number of Extensions
0
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.
Contains public sector information licensed under the Open Government Licence v3.0.
Contains Royal Mail data © Royal Mail copyright and Database right 2025.