Ground floor rear
Buckinghamshire
· Semi Detached
· 2023
£109k
· 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
59 days
The average number of days taken to approve a project in the last 2 years.
Number approved
136,072
The number of applications approved in the last 2 years.
Ground floor rear
Buckinghamshire
· Semi Detached
· 2024
£94k
· Jun '25
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
59 days
The average number of days taken to approve a project in the last 2 years.
Number approved
136,072
The number of applications approved in the last 2 years.
Ground floor rear
Dacorum
· Detached
· 2022
£84k
· Jun '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
59 days
The average number of days taken to approve a project in the last 2 years.
Number approved
136,072
The number of applications approved in the last 2 years.
Ground floor rear
Three Rivers
· Detached
· 2023
£68k
· 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
91%
The average approval rate of projects in the last 2 years.
Time to approval
59 days
The average number of days taken to approve a project in the last 2 years.
Number approved
136,072
The number of applications approved in the last 2 years.
Ground floor rear
Watford
· Bungalow
· 2024
£70k
· Dec '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
59 days
The average number of days taken to approve a project in the last 2 years.
Number approved
136,072
The number of applications approved in the last 2 years.
Ground floor rear
Hillingdon
· Semi Detached
· 2022
£90k
· Nov '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
59 days
The average number of days taken to approve a project in the last 2 years.
Number approved
136,072
The number of applications approved in the last 2 years.
Ground floor rear
Buckinghamshire
· Detached
· 2024
£83k
· May '24
Ground floor rear
Hillingdon
· Semi Detached
· 2022
£74k
· Feb '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Harrow
· Detached
· 2024
£59k
· Jun '24
Ground floor rear
Hillingdon
· Semi Detached
· 2024
£89k
· Mar '24
Ground floor rear
Harrow
· Semi Detached
· 2024
£96k
· Jan '25
Ground floor rear
Hillingdon
· Semi Detached
· 2023
£73k
· Aug '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Hillingdon
· Terrace
· 2024
£93k
· Feb '24
Ground floor rear
Slough
· Terrace
· 2024
£109k
· Jul '24
Ground floor rear
St Albans
· Terrace
· 2024
£69k
· Jan '24
Ground floor rear
Buckinghamshire
· Semi Detached
· 2024
£66k
· Sep '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Buckinghamshire
· Terrace
· 2022
£46k
· Apr '22
Ground floor rear
St Albans
· Semi Detached
· 2022
£115k
· Jan '22
Ground floor rear
Barnet
· Terrace
· 2024
£69k
· Nov '23
Ground floor rear
Ealing
· End Of Terrace
· 2022
£102k
· Sep '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Windsor and Maidenhead
· Semi Detached
· 2022
£86k
· Aug '22
Ground floor rear
Ealing
· Terrace
· 2024
£71k
· Jul '24
Ground floor rear
Barnet
· Semi Detached
· 2023
£73k
· Sep '23
Ground floor rear
Hounslow
· Semi Detached
· 2023
£102k
· Feb '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Ealing
· Terrace
· 2024
£102k
· Sep '24
Ground floor rear
Ealing
· Flat
· 2023
£68k
· May '22
Ground floor rear
Barnet
· Semi Detached
· 2023
£53k
· Nov '22
Ground floor rear
Windsor and Maidenhead
· Detached
· 2022
£133k
· May '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Barnet
· Semi Detached
· 2023
£69k
· Sep '23
Ground floor rear
Brent
· Flat
· 2022
£96k
· Mar '22
Ground floor rear
Hounslow
· Terrace
· 2024
£73k
· Dec '24
Ground floor rear
Brent
· Flat
· 2025
£172k
· Apr '25
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Richmond upon Thames
· Semi Detached
· 2023
£72k
· Jan '23
Ground floor rear
Richmond upon Thames
· Flat
· 2023
£116k
· Aug '23
Ground floor rear
Spelthorne
· Semi Detached
· 2024
£74k
· Nov '24
Ground floor rear
Richmond upon Thames
· Semi Detached
· 2023
£67k
· Aug '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
South Oxfordshire
· Semi Detached
· 2024
£65k
· Jul '24
Ground floor rear
Wokingham
· Semi Detached
· 2024
£96k
· Sep '24
Ground floor rear
Haringey
· End Of Terrace
· 2024
£126k
· Nov '23
Ground floor rear
Runnymede
· Terrace
· 2022
£74k
· Sep '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Richmond upon Thames
· Terrace
· 2024
£43k
· May '24
Ground floor rear
Richmond upon Thames
· Terrace
· 2023
£61k
· Feb '23
Ground floor rear
Enfield
· Terrace
· 2022
£80k
· Apr '22
Ground floor rear
Wandsworth
· Semi Detached
· 2023
£72k
· Oct '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Runnymede
· Semi Detached
· 2024
£78k
· Oct '23
Ground floor rear
Enfield
· Semi Detached
· 2024
£94k
· Dec '23
Ground floor rear
Enfield
· Terrace
· 2023
£64k
· Jan '23
Ground floor rear
Enfield
· Semi Detached
· 2023
£32k
· Jun '23
AI images
Images are AI-generated for homeowner privacy
