Ground floor rear
Brent
· Flat
· 2022
£92k
Excl VAT
Average build cost for a ground floor rear extension is £70k - £90k
Build cost
£70k - £90k
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
79%
The average approval rate of projects in the last 2 years.
Time to approval
60 days
The average number of days taken to approve a project in the last 2 years.
Number approved
169,462
The number of applications approved in the last 2 years.
Ground floor rear
Barnet
· Semi Detached
· 2023
£66k
Excl VAT
Average build cost for a ground floor rear extension is £70k - £90k
Build cost
£70k - £90k
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
79%
The average approval rate of projects in the last 2 years.
Time to approval
60 days
The average number of days taken to approve a project in the last 2 years.
Number approved
169,462
The number of applications approved in the last 2 years.
Ground floor rear and first floor rear
Islington
· Terrace
· 2023
£67k
Excl VAT
Average build cost for a ground floor rear extension is £70k - £90k
Build cost
£70k - £90k
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
79%
The average approval rate of projects in the last 2 years.
Time to approval
60 days
The average number of days taken to approve a project in the last 2 years.
Number approved
169,462
The number of applications approved in the last 2 years.
Ground floor rear
Wandsworth
· Flat
· 2022
£54k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Average build cost for a ground floor rear extension is £70k - £90k
Build cost
£70k - £90k
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
79%
The average approval rate of projects in the last 2 years.
Time to approval
60 days
The average number of days taken to approve a project in the last 2 years.
Number approved
169,462
The number of applications approved in the last 2 years.
Ground floor rear and internal alterations
Lambeth
· End Of Terrace
· 2024
£124k
Excl VAT
Average build cost for a ground floor rear extension is £70k - £90k
Build cost
£70k - £90k
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
79%
The average approval rate of projects in the last 2 years.
Time to approval
60 days
The average number of days taken to approve a project in the last 2 years.
Number approved
169,462
The number of applications approved in the last 2 years.
Ground floor rear
Wandsworth
· Semi Detached
· 2023
£69k
Excl VAT
Average build cost for a ground floor rear extension is £70k - £90k
Build cost
£70k - £90k
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
79%
The average approval rate of projects in the last 2 years.
Time to approval
60 days
The average number of days taken to approve a project in the last 2 years.
Number approved
169,462
The number of applications approved in the last 2 years.
Ground floor rear
Lambeth
· Semi Detached
· 2024
£67k
Excl VAT
Ground floor rear
Richmond upon Thames
· Terrace
· 2024
£41k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Loft main dormer and ground floor rear
Wandsworth
· Terrace
· 2024
£73k
Excl VAT
Loft main dormer, ground floor rear & internal alterations
Lambeth
· Terrace
· 2024
£237k
Excl VAT
Ground floor rear
Southwark
· Terrace
· 2025
£85k
Excl VAT
Ground floor rear
Wandsworth
· Terrace
· 2022
£131k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Haringey
· End Of Terrace
· 2024
£126k
Excl VAT
Ground floor rear
Barnet
· Semi Detached
· 2023
£53k
Excl VAT
Ground floor rear
Wandsworth
· Terrace
· 2023
£81k
Excl VAT
Ground floor rear and internal alterations
Haringey
· Terrace
· 2024
£97k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear, ground floor side, internal alterations & first floor side
Richmond upon Thames
· Semi Detached
· 2024
£267k
Excl VAT
Ground floor rear
Lambeth
· Semi Detached
· 2024
£115k
Excl VAT
Ground floor rear, ground floor side infill & internal alterations
Haringey
· Terrace
· 2023
£115k
Excl VAT
Loft main dormer and ground floor rear
Haringey
· Terrace
· 2024
£257k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear and internal alterations
Brent
· Terrace
· 2025
£80k
Excl VAT
Ground floor rear
Barnet
· Semi Detached
· 2023
£70k
Excl VAT
Ground floor rear
Ealing
· Flat
· 2022
£53k
Excl VAT
Ground floor rear
Southwark
· Terrace
· 2024
£92k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear and internal alterations
Merton
· Terrace
· 2022
£89k
Excl VAT
Loft main dormer and ground floor rear
Haringey
· Terrace
· 2024
£279k
Excl VAT
Ground floor rear
Lambeth
· Semi Detached
· 2023
£73k
Excl VAT
Ground floor rear
Ealing
· Terrace
· 2024
£68k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear
Southwark
· Semi Detached
· 2023
£65k
Excl VAT
Ground floor rear
Wandsworth
· Terrace
· 2023
£43k
Excl VAT
Ground floor rear and internal alterations
Southwark
· Terrace
· 2022
£175k
Excl VAT
Ground floor rear and internal alterations
Lambeth
· End Of Terrace
· 2022
£89k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear and internal alterations
Barnet
· Semi Detached
· 2024
£67k
Excl VAT
Ground floor rear
Ealing
· Terrace
· 2024
£98k
Excl VAT
Ground floor rear
Southwark
· Detached
· 2022
£87k
Excl VAT
Ground floor rear and loft hip to gable with main dormer
Haringey
· Semi Detached
· 2023
£159k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Loft main dormer and ground floor rear
Wandsworth
· Terrace
· 2023
£164k
Excl VAT
Ground floor rear and internal alterations
Southwark
· Flat
· 2023
£84k
Excl VAT
Ground floor rear and internal alterations
Merton
· End Of Terrace
· 2023
£127k
Excl VAT
Loft main dormer and ground floor rear
Lambeth
· Terrace
· 2022
£150k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor rear and internal alterations
Lambeth
· Terrace
· 2023
£63k
Excl VAT
Ground floor rear
Lambeth
· Terrace
· 2024
£91k
Excl VAT
Loft main dormer and ground floor rear
Merton
· Terrace
· 2024
£221k
Excl VAT
Ground floor rear and ground floor side infill
Lambeth
· Flat
· 2023
£77k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Loft main dormer and ground floor rear
Tower Hamlets
· Terrace
· 2023
£142k
Excl VAT
Ground floor rear
Enfield
· Terrace
· 2022
£77k
Excl VAT
Ground floor rear
Tower Hamlets
· Terrace
· 2025
£43k
Excl VAT
Ground floor rear and internal alterations
Wandsworth
· Terrace
· 2023
£89k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
