Ground floor rear
Southwark
· Detached
· 2022
£95k
· Sep '22
Average build cost for a ground floor rear extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
7-9%
The average value uplift of a project in the last 2 years.
Project length
8-9 months
The average time taken to complete a project in the last 2 years.
Planning approval
91%
The average approval rate of projects in the last 2 years.
Time to approval
57 days
The average number of days taken to approve a project in the last 2 years.
Number approved
88,468
The number of applications approved in the last 2 years.
Ground floor rear
Southwark
· Terrace
· 2025
£89k
· Sep '23
Average build cost for a ground floor rear extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
7-9%
The average value uplift of a project in the last 2 years.
Project length
8-9 months
The average time taken to complete a project in the last 2 years.
Planning approval
91%
The average approval rate of projects in the last 2 years.
Time to approval
57 days
The average number of days taken to approve a project in the last 2 years.
Number approved
88,468
The number of applications approved in the last 2 years.
Ground floor rear
Tower Hamlets
· Terrace
· 2025
£45k
· Aug '24
Average build cost for a ground floor rear extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
7-9%
The average value uplift of a project in the last 2 years.
Project length
8-9 months
The average time taken to complete a project in the last 2 years.
Planning approval
91%
The average approval rate of projects in the last 2 years.
Time to approval
57 days
The average number of days taken to approve a project in the last 2 years.
Number approved
88,468
The number of applications approved in the last 2 years.
Ground floor rear
Lambeth
· Semi Detached
· 2024
£124k
· Jan '24
AI images
Images are AI-generated for homeowner privacy
Average build cost for a ground floor rear extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
7-9%
The average value uplift of a project in the last 2 years.
Project length
8-9 months
The average time taken to complete a project in the last 2 years.
Planning approval
91%
The average approval rate of projects in the last 2 years.
Time to approval
57 days
The average number of days taken to approve a project in the last 2 years.
Number approved
88,468
The number of applications approved in the last 2 years.
Ground floor rear
Southwark
· Semi Detached
· 2023
£67k
· Jul '23
Average build cost for a ground floor rear extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
7-9%
The average value uplift of a project in the last 2 years.
Project length
8-9 months
The average time taken to complete a project in the last 2 years.
Planning approval
91%
The average approval rate of projects in the last 2 years.
Time to approval
57 days
The average number of days taken to approve a project in the last 2 years.
Number approved
88,468
The number of applications approved in the last 2 years.
Ground floor rear
Greenwich
· Terrace
· 2024
£106k
· Sep '24
Average build cost for a ground floor rear extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
7-9%
The average value uplift of a project in the last 2 years.
Project length
8-9 months
The average time taken to complete a project in the last 2 years.
Planning approval
91%
The average approval rate of projects in the last 2 years.
Time to approval
57 days
The average number of days taken to approve a project in the last 2 years.
Number approved
88,468
The number of applications approved in the last 2 years.
Ground floor rear
Lewisham
· Terrace
· 2024
£132k
· Jul '24
Ground floor rear
Southwark
· Terrace
· 2024
£99k
· Nov '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lewisham
· Semi Detached
· 2024
£89k
· Sep '24
Ground floor rear
Lewisham
· Terrace
· 2025
£96k
· Sep '24
Ground floor rear
Lambeth
· Semi Detached
· 2024
£69k
· Sep '23
Ground floor rear
Newham
· Terrace
· 2024
£61k
· Apr '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lambeth
· End Of Terrace
· 2024
£99k
· Aug '24
Ground floor rear
Lewisham
· Terrace
· 2023
£86k
· Aug '23
Ground floor rear
Lewisham
· Semi Detached
· 2023
£97k
· Sep '23
Ground floor rear
Wandsworth
· Flat
· 2022
£59k
· Oct '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lambeth
· Semi Detached
· 2023
£79k
· May '23
Ground floor rear
Lewisham
· Semi Detached
· 2022
£77k
· Oct '22
Ground floor rear
Greenwich
· Semi Detached
· 2022
£80k
· Sep '22
Ground floor rear
Waltham Forest
· Terrace
· 2023
£72k
· May '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lewisham
· Semi Detached
· 2025
£59k
· Jan '25
Ground floor rear
Lambeth
· Semi Detached
· 2024
£96k
· Feb '24
Ground floor rear
Lewisham
· Terrace
· 2022
£82k
· Mar '22
Ground floor rear
Waltham Forest
· Terrace
· 2022
£75k
· Mar '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lambeth
· Terrace
· 2023
£55k
· Oct '23
Ground floor rear
Waltham Forest
· Terrace
· 2024
£59k
· May '24
Ground floor rear
Greenwich
· Terrace
· 2024
£100k
· Jul '22
Ground floor rear
Lambeth
· Terrace
· 2022
£73k
· Jul '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Greenwich
· Semi Detached
· 2024
£79k
· Jul '24
Ground floor rear
Newham
· Terrace
· 2023
£76k
· Jun '23
Ground floor rear
Redbridge
· Terrace
· 2023
£85k
· Aug '23
Ground floor rear
Bromley
· Terrace
· 2024
£74k
· Mar '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Haringey
· End Of Terrace
· 2024
£131k
· Nov '23
Ground floor rear
Waltham Forest
· Terrace
· 2024
£86k
· Jan '24
Ground floor rear
Waltham Forest
· Semi Detached
· 2025
£95k
· Dec '24
Ground floor rear
Wandsworth
· Terrace
· 2022
£136k
· Dec '21
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Wandsworth
· Terrace
· 2023
£45k
· Mar '23
Ground floor rear
Waltham Forest
· Terrace
· 2024
£96k
· Sep '24
Ground floor rear
Waltham Forest
· Terrace
· 2024
£69k
· Jun '24
Ground floor rear
Wandsworth
· Terrace
· 2023
£87k
· Jul '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lewisham
· Terrace
· 2024
£96k
· Jul '24
Ground floor rear
Redbridge
· End Of Terrace
· 2023
£69k
· Jul '23
Ground floor rear
Lambeth
· Terrace
· 2024
£45k
· Aug '24
Ground floor rear
Haringey
· Terrace
· 2024
£78k
· Jul '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Greenwich
· Semi Detached
· 2025
£95k
· Sep '24
Ground floor rear
Greenwich
· Terrace
· 2023
£82k
· May '23
Ground floor rear
Brent
· Flat
· 2025
£179k
· Apr '25
Ground floor rear
Lambeth
· Terrace
· 2024
£72k
· Jan '24
AI images
Images are AI-generated for homeowner privacy
