Ground floor rear
Wandsworth
· Flat
· 2022
£57k
· Oct '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
88%
The average approval rate of projects in the last 2 years.
Time to approval
61 days
The average number of days taken to approve a project in the last 2 years.
Number approved
188,198
The number of applications approved in the last 2 years.
Ground floor rear
Lambeth
· Semi Detached
· 2024
£67k
· 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
88%
The average approval rate of projects in the last 2 years.
Time to approval
61 days
The average number of days taken to approve a project in the last 2 years.
Number approved
188,198
The number of applications approved in the last 2 years.
Ground floor rear
Wandsworth
· Terrace
· 2022
£131k
· Dec '21
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
88%
The average approval rate of projects in the last 2 years.
Time to approval
61 days
The average number of days taken to approve a project in the last 2 years.
Number approved
188,198
The number of applications approved in the last 2 years.
Ground floor rear
Wandsworth
· Semi Detached
· 2023
£72k
· Oct '23
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
88%
The average approval rate of projects in the last 2 years.
Time to approval
61 days
The average number of days taken to approve a project in the last 2 years.
Number approved
188,198
The number of applications approved in the last 2 years.
Ground floor rear
Southwark
· Terrace
· 2025
£85k
· 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
88%
The average approval rate of projects in the last 2 years.
Time to approval
61 days
The average number of days taken to approve a project in the last 2 years.
Number approved
188,198
The number of applications approved in the last 2 years.
Ground floor rear
Wandsworth
· Terrace
· 2023
£84k
· 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
88%
The average approval rate of projects in the last 2 years.
Time to approval
61 days
The average number of days taken to approve a project in the last 2 years.
Number approved
188,198
The number of applications approved in the last 2 years.
Ground floor rear
Brent
· Flat
· 2025
£172k
· Apr '25
Ground floor rear
Lambeth
· Semi Detached
· 2024
£119k
· Jan '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lambeth
· Semi Detached
· 2023
£76k
· May '23
Ground floor rear
Richmond upon Thames
· Terrace
· 2024
£43k
· May '24
Ground floor rear
Southwark
· Terrace
· 2024
£96k
· Nov '23
Ground floor rear
Wandsworth
· Terrace
· 2023
£43k
· Mar '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Southwark
· Semi Detached
· 2023
£67k
· Jul '23
Ground floor rear
Brent
· Flat
· 2022
£96k
· Mar '22
Ground floor rear
Lambeth
· End Of Terrace
· 2024
£95k
· Aug '24
Ground floor rear
Merton
· Terrace
· 2022
£72k
· Mar '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Merton
· Terrace
· 2024
£108k
· May '24
Ground floor rear
Lambeth
· Terrace
· 2024
£43k
· Aug '24
Ground floor rear
Lambeth
· Semi Detached
· 2024
£92k
· Feb '24
Ground floor rear
Barnet
· Semi Detached
· 2023
£69k
· Sep '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Southwark
· Detached
· 2022
£91k
· Sep '22
Ground floor rear
Lambeth
· Terrace
· 2022
£66k
· Dec '21
Ground floor rear
Lambeth
· Terrace
· 2024
£69k
· Jan '24
Ground floor rear
Lambeth
· Terrace
· 2022
£70k
· Jul '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lewisham
· Terrace
· 2024
£127k
· Jul '24
Ground floor rear
Lambeth
· Terrace
· 2024
£107k
· Sep '24
Ground floor rear
Lambeth
· Terrace
· 2023
£55k
· Oct '23
Ground floor rear
Merton
· End Of Terrace
· 2024
£81k
· Apr '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Ealing
· Flat
· 2023
£68k
· May '22
Ground floor rear
Haringey
· End Of Terrace
· 2024
£126k
· Nov '23
Ground floor rear
Lewisham
· Semi Detached
· 2024
£86k
· Sep '24
Ground floor rear
Lewisham
· Terrace
· 2025
£92k
· Sep '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Tower Hamlets
· Terrace
· 2025
£43k
· Aug '24
Ground floor rear
Ealing
· Terrace
· 2024
£71k
· Jul '24
Ground floor rear
Ealing
· Terrace
· 2024
£102k
· Sep '24
Ground floor rear
Greenwich
· Terrace
· 2024
£102k
· Sep '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Lewisham
· Terrace
· 2023
£83k
· Aug '23
Ground floor rear
Merton
· Terrace
· 2023
£83k
· Oct '23
Ground floor rear
Barnet
· Semi Detached
· 2023
£53k
· Nov '22
Ground floor rear
Croydon
· Terrace
· 2023
£54k
· Apr '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Barnet
· Semi Detached
· 2023
£73k
· Sep '23
Ground floor rear
Lewisham
· Terrace
· 2022
£79k
· Mar '22
Ground floor rear
Richmond upon Thames
· Semi Detached
· 2023
£72k
· Jan '23
Ground floor rear
Bromley
· Terrace
· 2024
£71k
· Mar '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Richmond upon Thames
· Flat
· 2023
£116k
· Aug '23
Ground floor rear
Croydon
· End Of Terrace
· 2024
£77k
· Jun '23
Ground floor rear
Lewisham
· Semi Detached
· 2022
£74k
· Oct '22
Ground floor rear
Hounslow
· Terrace
· 2024
£70k
· Dec '24
AI images
Images are AI-generated for homeowner privacy
