Loft outrigger dormer
Merton
· Detached
· 2023
£52k
· Oct '22
Average build cost for a loft extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
9-11%
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
87%
The average approval rate of projects in the last 2 years.
Time to approval
65 days
The average number of days taken to approve a project in the last 2 years.
Number approved
55,462
The number of applications approved in the last 2 years.
Loft main dormer
Wandsworth
· Terrace
· 2024
£105k
· Aug '24
Average build cost for a loft extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
9-11%
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
87%
The average approval rate of projects in the last 2 years.
Time to approval
65 days
The average number of days taken to approve a project in the last 2 years.
Number approved
55,462
The number of applications approved in the last 2 years.
Loft L shaped dormer and loft roof terrace
Wandsworth
· Flat
· 2023
£95k
· Feb '23
Average build cost for a loft extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
9-11%
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
87%
The average approval rate of projects in the last 2 years.
Time to approval
65 days
The average number of days taken to approve a project in the last 2 years.
Number approved
55,462
The number of applications approved in the last 2 years.
Loft main dormer
Wandsworth
· Terrace
· 2022
£72k
· Jan '22
AI images
Images are AI-generated for homeowner privacy
Average build cost for a loft extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
9-11%
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
87%
The average approval rate of projects in the last 2 years.
Time to approval
65 days
The average number of days taken to approve a project in the last 2 years.
Number approved
55,462
The number of applications approved in the last 2 years.
Loft L shaped dormer
Richmond upon Thames
· Terrace
· 2024
£75k
· Nov '23
Average build cost for a loft extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
9-11%
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
87%
The average approval rate of projects in the last 2 years.
Time to approval
65 days
The average number of days taken to approve a project in the last 2 years.
Number approved
55,462
The number of applications approved in the last 2 years.
Loft L shaped dormer
Lambeth
· Terrace
· 2024
£141k
· Feb '24
Average build cost for a loft extension is £80k - £100k
Build cost
£80k - £100k
The average cost of a project in the last 2 years.
Value-add
9-11%
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
87%
The average approval rate of projects in the last 2 years.
Time to approval
65 days
The average number of days taken to approve a project in the last 2 years.
Number approved
55,462
The number of applications approved in the last 2 years.
Loft main dormer
Merton
· Terrace
· 2022
£64k
· Feb '22
Loft main dormer
Lambeth
· Terrace
· 2023
£61k
· Jun '23
AI images
Images are AI-generated for homeowner privacy
Loft main dormer
Ealing
· Terrace
· 2022
£84k
· Nov '22
Loft L shaped dormer
Brent
· Terrace
· 2022
£100k
· Jun '22
Loft main dormer
Kingston upon Thames
· Semi Detached
· 2022
£92k
· Feb '22
Loft main dormer
Kingston upon Thames
· Terrace
· 2025
£57k
· Sep '24
AI images
Images are AI-generated for homeowner privacy
Loft L shaped dormer
Kingston upon Thames
· Semi Detached
· 2025
£80k
· Sep '24
Loft main dormer
Camden
· Flat
· 2023
£64k
· Apr '23
Loft L shaped dormer
Southwark
· Terrace
· 2024
£106k
· Jun '23
Loft main dormer
Southwark
· Semi Detached
· 2025
£72k
· Apr '25
AI images
Images are AI-generated for homeowner privacy
Loft roof terrace
Southwark
· Flat
· 2025
£22k
· Sep '25
Loft L shaped dormer
Southwark
· Terrace
· 2024
£89k
· Apr '23
Loft hip to gable with main dormer
Southwark
· Semi Detached
· 2022
£75k
· Apr '22
Loft L shaped dormer
Southwark
· End Of Terrace
· 2023
£73k
· Dec '23
AI images
Images are AI-generated for homeowner privacy
Loft L shaped dormer
Sutton
· Terrace
· 2022
£76k
· Feb '22
Loft main dormer and loft roof terrace
Camden
· Terrace
· 2024
£83k
· Feb '24
Loft main dormer
Southwark
· Terrace
· 2024
£56k
· Jul '24
Loft hip to gable with main dormer
Bromley
· Semi Detached
· 2024
£75k
· Mar '24
AI images
Images are AI-generated for homeowner privacy
Loft hip to gable with main dormer
Brent
· Semi Detached
· 2024
£99k
· Mar '24
Loft L shaped dormer
Epsom and Ewell
· Semi Detached
· 2024
£71k
· Nov '23
Loft L shaped dormer
Croydon
· Terrace
· 2023
£92k
· Jan '23
Loft main dormer
Lewisham
· Terrace
· 2023
£110k
· Dec '22
AI images
Images are AI-generated for homeowner privacy
Loft hip to gable with main dormer
Barnet
· Terrace
· 2022
£68k
· Mar '22
Loft main dormer
Barnet
· Terrace
· 2023
£81k
· May '23
Loft outrigger dormer
Haringey
· Terrace
· 2024
£51k
· Feb '24
Loft hip to gable with main dormer
Hillingdon
· Semi Detached
· 2024
£92k
· Nov '24
AI images
Images are AI-generated for homeowner privacy
Loft main dormer
Hillingdon
· Semi Detached
· 2024
£93k
· Mar '24
Loft main dormer
Lewisham
· Terrace
· 2024
£57k
· Jan '24
Loft L shaped dormer
Greenwich
· Terrace
· 2024
£140k
· Mar '25
Loft hip to gable with main dormer
Greenwich
· Terrace
· 2024
£113k
· Aug '24
AI images
Images are AI-generated for homeowner privacy
Loft L shaped dormer
Haringey
· Terrace
· 2024
£110k
· Nov '24
Loft hip to gable with main dormer
Greenwich
· Semi Detached
· 2024
£72k
· May '24
Loft main dormer
Newham
· End Of Terrace
· 2023
£74k
· Jun '23
Loft L shaped dormer
Waltham Forest
· Flat
· 2024
£89k
· Jan '24
AI images
Images are AI-generated for homeowner privacy
Loft main dormer
Waltham Forest
· Flat
· 2023
£84k
· Jun '23
Loft L shaped dormer
Enfield
· Terrace
· 2024
£106k
· Mar '24
Loft main dormer
Runnymede
· Bungalow
· 2025
£110k
· Jul '24
Loft main dormer
Greenwich
· Terrace
· 2023
£66k
· Feb '23
AI images
Images are AI-generated for homeowner privacy
Loft main dormer
Bromley
· Semi Detached
· 2024
£90k
· Apr '24
Loft hip to gable with main dormer
Bromley
· Bungalow
· 2024
£102k
· Mar '24
Loft main dormer
Enfield
· End Of Terrace
· 2024
£87k
· Dec '24
Loft main dormer
Bromley
· Terrace
· 2024
£159k
· Mar '24
AI images
Images are AI-generated for homeowner privacy
