Ground floor rear
Spelthorne
· Semi Detached
· 2024
£74k
· Nov '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
Hounslow
· Semi Detached
· 2023
£106k
· Feb '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
Richmond upon Thames
· Semi Detached
· 2023
£67k
· Aug '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
Richmond upon Thames
· Terrace
· 2023
£64k
· Feb '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
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
Hounslow
· Terrace
· 2024
£73k
· Dec '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
Richmond upon Thames
· Semi Detached
· 2023
£75k
· Jan '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
Richmond upon Thames
· Flat
· 2023
£121k
· Aug '23
Ground floor rear
Windsor and Maidenhead
· Detached
· 2022
£139k
· May '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Ealing
· Terrace
· 2024
£106k
· Sep '24
Ground floor rear
Ealing
· End Of Terrace
· 2022
£102k
· Sep '22
Ground floor rear
Runnymede
· Terrace
· 2022
£77k
· Sep '22
Ground floor rear
Ealing
· Flat
· 2023
£71k
· May '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Ealing
· Terrace
· 2024
£71k
· Jul '24
Ground floor rear
Hillingdon
· Terrace
· 2024
£97k
· Feb '24
Ground floor rear
Runnymede
· Semi Detached
· 2024
£81k
· Oct '23
Ground floor rear
Richmond upon Thames
· Terrace
· 2024
£45k
· May '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Kingston upon Thames
· Terrace
· 2024
£108k
· May '24
Ground floor rear
Kingston upon Thames
· Terrace
· 2024
£69k
· Sep '23
Ground floor rear
Kingston upon Thames
· Semi Detached
· 2023
£61k
· Aug '23
Ground floor rear
Hillingdon
· Semi Detached
· 2022
£77k
· Feb '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Kingston upon Thames
· Terrace
· 2023
£84k
· Sep '23
Ground floor rear
Wandsworth
· Semi Detached
· 2023
£72k
· Oct '23
Ground floor rear
Hillingdon
· Semi Detached
· 2024
£89k
· Mar '24
Ground floor rear
Hillingdon
· Semi Detached
· 2023
£73k
· Aug '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Elmbridge
· Semi Detached
· 2025
£98k
· Nov '24
Ground floor rear
Epsom and Ewell
· End Of Terrace
· 2022
£51k
· Jul '22
Ground floor rear
Epsom and Ewell
· Detached
· 2024
£93k
· May '24
Ground floor rear
Merton
· Terrace
· 2024
£97k
· Aug '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Epsom and Ewell
· Detached
· 2024
£64k
· Nov '24
Ground floor rear
Epsom and Ewell
· Terrace
· 2023
£46k
· Jun '23
Ground floor rear
Wandsworth
· Terrace
· 2022
£136k
· Dec '21
Ground floor rear
Wandsworth
· Terrace
· 2023
£87k
· Jul '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Harrow
· Semi Detached
· 2024
£96k
· Jan '25
Ground floor rear
Harrow
· Detached
· 2024
£61k
· Jun '24
Ground floor rear
Mole Valley
· Semi Detached
· 2024
£77k
· May '24
Ground floor rear
Brent
· Flat
· 2025
£179k
· Apr '25
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Wandsworth
· Terrace
· 2023
£45k
· Mar '23
Ground floor rear
Wandsworth
· Flat
· 2022
£59k
· Oct '22
Ground floor rear
Brent
· Flat
· 2022
£100k
· Mar '22
Ground floor rear
Epsom and Ewell
· Semi Detached
· 2022
£31k
· Mar '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Hillingdon
· Semi Detached
· 2022
£90k
· Nov '22
Ground floor rear
Merton
· Terrace
· 2022
£74k
· Mar '22
Ground floor rear
Woking
· Detached
· 2023
£51k
· May '23
Ground floor rear
Merton
· Terrace
· 2024
£113k
· May '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Slough
· Terrace
· 2024
£113k
· Jul '24
Ground floor rear
Merton
· End Of Terrace
· 2024
£85k
· Apr '24
Ground floor rear
Lambeth
· Terrace
· 2022
£69k
· Dec '21
Ground floor rear
Barnet
· Semi Detached
· 2023
£76k
· Sep '23
AI images
Images are AI-generated for homeowner privacy
