Ground floor side infill
Ealing
· Flat
· 2022
£72k
Excl VAT
Average build cost for a ground floor side infill extension is £70k - £90k
Build cost
£70k - £90k
The average cost of a project in the last 2 years.
Value-add
2-4%
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
80%
The average approval rate of projects in the last 2 years.
Time to approval
66 days
The average number of days taken to approve a project in the last 2 years.
Number approved
87,354
The number of applications approved in the last 2 years.
Ground floor side infill
Westminster
· Terrace
· 2022
£69k
Excl VAT
Average build cost for a ground floor side infill extension is £70k - £90k
Build cost
£70k - £90k
The average cost of a project in the last 2 years.
Value-add
2-4%
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
80%
The average approval rate of projects in the last 2 years.
Time to approval
66 days
The average number of days taken to approve a project in the last 2 years.
Number approved
87,354
The number of applications approved in the last 2 years.
Ground floor side infill and internal alterations
Ealing
· Flat
· 2023
£91k
Excl VAT
Average build cost for a ground floor side infill extension is £70k - £90k
Build cost
£70k - £90k
The average cost of a project in the last 2 years.
Value-add
2-4%
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
80%
The average approval rate of projects in the last 2 years.
Time to approval
66 days
The average number of days taken to approve a project in the last 2 years.
Number approved
87,354
The number of applications approved in the last 2 years.
Ground floor side infill and Loft L shaped dormer
Ealing
· Terrace
· 2024
£296k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Average build cost for a ground floor side infill extension is £70k - £90k
Build cost
£70k - £90k
The average cost of a project in the last 2 years.
Value-add
2-4%
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
80%
The average approval rate of projects in the last 2 years.
Time to approval
66 days
The average number of days taken to approve a project in the last 2 years.
Number approved
87,354
The number of applications approved in the last 2 years.
Loft main dormer and ground floor side infill
Ealing
· Terrace
· 2022
£150k
Excl VAT
Average build cost for a ground floor side infill extension is £70k - £90k
Build cost
£70k - £90k
The average cost of a project in the last 2 years.
Value-add
2-4%
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
80%
The average approval rate of projects in the last 2 years.
Time to approval
66 days
The average number of days taken to approve a project in the last 2 years.
Number approved
87,354
The number of applications approved in the last 2 years.
Ground floor side infill
Westminster
· Flat
· 2023
£37k
Excl VAT
Average build cost for a ground floor side infill extension is £70k - £90k
Build cost
£70k - £90k
The average cost of a project in the last 2 years.
Value-add
2-4%
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
80%
The average approval rate of projects in the last 2 years.
Time to approval
66 days
The average number of days taken to approve a project in the last 2 years.
Number approved
87,354
The number of applications approved in the last 2 years.
Ground floor side infill and first floor rear over ground floor
Barnet
· Detached
· 2024
£321k
Excl VAT
Ground floor side infill
Barnet
· Terrace
· 2023
£77k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Hammersmith and Fulham
· Flat
· 2023
£78k
Excl VAT
Ground floor side infill
Richmond upon Thames
· Semi Detached
· 2024
£71k
Excl VAT
Ground floor side infill
Richmond upon Thames
· Terrace
· 2022
£78k
Excl VAT
Ground floor side infill
Hillingdon
· Semi Detached
· 2025
£117k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Wandsworth
· Terrace
· 2024
£138k
Excl VAT
Ground floor side infill and internal alterations
Richmond upon Thames
· Flat
· 2024
£84k
Excl VAT
Ground floor side infill
Barnet
· Semi Detached
· 2025
£74k
Excl VAT
Ground floor side infill
Barnet
· Terrace
· 2023
£57k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Haringey
· Terrace
· 2023
£102k
Excl VAT
Ground floor side infill
Enfield
· Semi Detached
· 2022
£101k
Excl VAT
Ground floor rear, ground floor side infill & internal alterations
Haringey
· Terrace
· 2023
£115k
Excl VAT
Ground floor side infill and Loft L shaped dormer
Wandsworth
· Terrace
· 2024
£185k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Wandsworth
· Flat
· 2024
£88k
Excl VAT
Ground floor side infill and Loft L shaped dormer
Wandsworth
· Terrace
· 2023
£210k
Excl VAT
Ground floor side infill and internal alterations
Wandsworth
· Terrace
· 2024
£104k
Excl VAT
Ground floor side infill
Lambeth
· Semi Detached
· 2023
£118k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Lambeth
· Flat
· 2024
£76k
Excl VAT
Ground floor side infill and internal alterations
Lambeth
· Flat
· 2023
£107k
Excl VAT
Ground floor side infill
Wandsworth
· Detached
· 2023
£87k
Excl VAT
Ground floor side infill and ground floor wraparound
Lambeth
· Terrace
· 2022
£98k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Wandsworth
· Flat
· 2024
£48k
Excl VAT
Ground floor side infill
Wandsworth
· End Of Terrace
· 2022
£99k
Excl VAT
Ground floor side infill
Hackney
· Terrace
· 2024
£61k
Excl VAT
Ground floor side infill and Loft L shaped dormer
Wandsworth
· Terrace
· 2022
£263k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Loft main dormer and ground floor side infill
Lambeth
· Terrace
· 2023
£153k
Excl VAT
Ground floor side infill
Hackney
· Terrace
· 2024
£87k
Excl VAT
Ground floor side infill, internal alterations & facade alterations
Hackney
· Terrace
· 2024
£149k
Excl VAT
Ground floor side infill, internal alterations & Loft L shaped dormer
Wandsworth
· Terrace
· 2024
£154k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Loft main dormer and ground floor side infill
Wandsworth
· Terrace
· 2023
£187k
Excl VAT
Ground floor side infill
Wandsworth
· Flat
· 2023
£79k
Excl VAT
Ground floor side infill
Wandsworth
· Flat
· 2023
£37k
Excl VAT
Ground floor side infill
Merton
· Terrace
· 2023
£58k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill
Wandsworth
· Terrace
· 2022
£87k
Excl VAT
Ground floor side infill and internal alterations
Watford
· Semi Detached
· 2023
£91k
Excl VAT
Ground floor side infill and Loft L shaped dormer
Wandsworth
· Terrace
· 2023
£167k
Excl VAT
Ground floor side infill, Loft L shaped dormer & first floor rear
Merton
· Terrace
· 2024
£283k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side infill and internal alterations
Southwark
· Flat
· 2022
£96k
Excl VAT
Ground floor side infill and internal alterations
Lambeth
· Flat
· 2023
£73k
Excl VAT
Ground floor side infill
Lambeth
· Terrace
· 2023
£99k
Excl VAT
Ground floor side infill
Merton
· Semi Detached
· 2024
£102k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
