Ground floor rear
North Northamptonshire
· Detached
· 2024
£130k
· Jul '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
Bedford
· Detached
· 2024
£174k
· Mar '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
Cambridge
· Semi Detached
· 2024
£147k
· 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
Milton Keynes
· Terrace
· 2023
£46k
· 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
North Hertfordshire
· End Of Terrace
· 2024
£94k
· 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
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
Buckinghamshire
· Terrace
· 2022
£48k
· Apr '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
Dacorum
· Detached
· 2022
£88k
· Jun '22
Ground floor rear
South Oxfordshire
· Semi Detached
· 2024
£68k
· Jul '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
East Hertfordshire
· Terrace
· 2025
£74k
· Jun '24
Ground floor rear
East Hertfordshire
· Detached
· 2024
£92k
· Nov '23
Ground floor rear
St Albans
· Terrace
· 2024
£72k
· Jan '24
Ground floor rear
St Albans
· Semi Detached
· 2022
£120k
· Jan '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Three Rivers
· Detached
· 2023
£71k
· Oct '23
Ground floor rear
Buckinghamshire
· Semi Detached
· 2023
£113k
· Sep '23
Ground floor rear
Watford
· Bungalow
· 2024
£73k
· Dec '23
Ground floor rear
Braintree
· Semi Detached
· 2022
£152k
· Apr '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Buckinghamshire
· Semi Detached
· 2024
£94k
· Jun '25
Ground floor rear
Epping Forest
· Terrace
· 2023
£81k
· Jul '23
Ground floor rear
Enfield
· Semi Detached
· 2023
£33k
· Jun '23
Ground floor rear
Buckinghamshire
· Detached
· 2024
£87k
· May '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Hillingdon
· Semi Detached
· 2022
£90k
· Nov '22
Ground floor rear
Epping Forest
· Detached
· 2024
£93k
· Aug '24
Ground floor rear
Epping Forest
· Terrace
· 2023
£92k
· Mar '23
Ground floor rear
Enfield
· Semi Detached
· 2024
£94k
· Dec '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Barnet
· Terrace
· 2024
£72k
· Nov '23
Ground floor rear
Buckinghamshire
· Semi Detached
· 2024
£66k
· Sep '24
Ground floor rear
Epping Forest
· Detached
· 2024
£365k
· Jul '24
Ground floor rear
Harrow
· Detached
· 2024
£61k
· Jun '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Harrow
· Semi Detached
· 2024
£96k
· Jan '25
Ground floor rear
Enfield
· Terrace
· 2022
£94k
· Apr '26
Ground floor rear
Enfield
· Terrace
· 2023
£85k
· Jan '23
Ground floor rear
Barnet
· Semi Detached
· 2023
£55k
· Nov '22
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Barnet
· Semi Detached
· 2023
£76k
· Sep '23
Ground floor rear
Waltham Forest
· End Of Terrace
· 2024
£108k
· Mar '24
Ground floor rear
Waltham Forest
· Semi Detached
· 2023
£100k
· Feb '23
Ground floor rear
Waltham Forest
· Terrace
· 2023
£64k
· Sep '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Waltham Forest
· Terrace
· 2026
£98k
· Jun '26
Ground floor rear
Haringey
· Terrace
· 2024
£78k
· Jul '22
Ground floor rear
Hillingdon
· Semi Detached
· 2023
£73k
· Aug '23
Ground floor rear
Chelmsford
· Bungalow
· 2022
£75k
· Oct '23
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Redbridge
· Semi Detached
· 2025
£93k
· Jan '25
Ground floor rear
Hillingdon
· Semi Detached
· 2024
£89k
· Mar '24
Ground floor rear
Haringey
· End Of Terrace
· 2024
£131k
· Nov '23
Ground floor rear
Waltham Forest
· Terrace
· 2024
£75k
· Mar '24
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Waltham Forest
· Terrace
· 2022
£90k
· Feb '22
Ground floor rear
Hillingdon
· Semi Detached
· 2022
£77k
· Feb '22
Ground floor rear
Waltham Forest
· Terrace
· 2024
£96k
· Sep '24
Ground floor rear
Waltham Forest
· Terrace
· 2024
£96k
· May '22
AI images
Images are AI-generated for homeowner privacy
