Ground floor side
Enfield
· End Of Terrace
· 2022
£101k
Excl VAT
Average build cost for a ground floor side 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, ground floor side, internal alterations & Loft L shaped dormer
Lambeth
· Semi Detached
· 2022
£202k
Excl VAT
Average build cost for a ground floor side 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
Lewisham
· Semi Detached
· 2024
£88k
Excl VAT
Average build cost for a ground floor side 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 rear, ground floor side, internal alterations & first floor side
Richmond upon Thames
· Semi Detached
· 2024
£267k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Average build cost for a ground floor side 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
Greenwich
· Semi Detached
· 2025
£61k
Excl VAT
Average build cost for a ground floor side 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
Bromley
· Semi Detached
· 2024
£73k
Excl VAT
Average build cost for a ground floor side 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 rear and ground floor side
Bromley
· Terrace
· 2022
£88k
Excl VAT
Ground floor rear, ground floor side, ground floor front & internal alterations
Bromley
· Detached
· 2023
£163k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side and internal alterations
Crawley
· Semi Detached
· 2024
£96k
Excl VAT
Ground floor side
West Berkshire
· Detached
· 2022
£43k
Excl VAT
Ground floor side
Haringey
· Detached
· 2024
£193k
Excl VAT
Ground floor side, internal alterations & internal alterations
Barnet
· Detached
· 2024
£143k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side and garage conversion
Southwark
· Detached
· 2023
£64k
Excl VAT
Ground floor side
Merton
· End Of Terrace
· 2023
£56k
Excl VAT
Ground floor side
Broxbourne
· Semi Detached
· 2022
£140k
Excl VAT
Ground floor side and ground floor front
Harrow
· Semi Detached
· 2024
£114k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side
Bexley
· Semi Detached
· 2024
£82k
Excl VAT
Ground floor rear and ground floor side
Richmond upon Thames
· End Of Terrace
· 2023
£111k
Excl VAT
Ground floor side, two storey rear & facade alterations
Elmbridge
· Detached
· 2023
£205k
Excl VAT
Loft main dormer and ground floor side
Elmbridge
· Detached
· 2025
£343k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side and garage conversion
Reigate and Banstead
· Detached
· 2024
£335k
Excl VAT
Ground floor side and internal alterations
Elmbridge
· Detached
· 2022
£101k
Excl VAT
Ground floor side, internal alterations & internal alterations
Elmbridge
· Detached
· 2024
£181k
Excl VAT
Ground floor side, two storey front & facade alterations
Sevenoaks
· Semi Detached
· 2022
£198k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side
Buckinghamshire
· Semi Detached
· 2023
£60k
Excl VAT
Ground floor side, two storey side & internal alterations
Guildford
· Semi Detached
· 2023
£90k
Excl VAT
Ground floor side, loft hip to gable with main dormer, internal alterations, internal alterations & first floor rear
Tunbridge Wells
· Semi Detached
· 2023
£197k
Excl VAT
Ground floor side, internal alterations & garage conversion
Wokingham
· Detached
· 2024
£123k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side
Waverley
· Bungalow
· 2023
£70k
Excl VAT
Loft main dormer and ground floor side
Reading
· Detached
· 2022
£128k
Excl VAT
Ground floor side and internal alterations
Mid Sussex
· Semi Detached
· 2022
£95k
Excl VAT
Ground floor side, internal alterations & garden annex
Chichester
· End Of Terrace
· 2023
£256k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Ground floor side
South Cambridgeshire
· Semi Detached
· 2024
£135k
Excl VAT
Ground floor side
Wealden
· Detached
· 2023
£60k
Excl VAT
Ground floor side
Rother
· Semi Detached
· 2022
£72k
Excl VAT
