Loft outrigger dormer
Merton
· Detached
· 2023
£52k
Excl VAT
Average build cost for a loft outrigger dormer extension is £50k - £70k
Build cost
£50k - £70k
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
81%
The average approval rate of projects in the last 2 years.
Time to approval
67 days
The average number of days taken to approve a project in the last 2 years.
Number approved
52,099
The number of applications approved in the last 2 years.
Loft outrigger dormer
Haringey
· Terrace
· 2024
£51k
Excl VAT
Average build cost for a loft outrigger dormer extension is £50k - £70k
Build cost
£50k - £70k
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
81%
The average approval rate of projects in the last 2 years.
Time to approval
67 days
The average number of days taken to approve a project in the last 2 years.
Number approved
52,099
The number of applications approved in the last 2 years.
Loft outrigger dormer and internal alterations
Lambeth
· Terrace
· 2023
£124k
Excl VAT
Average build cost for a loft outrigger dormer extension is £50k - £70k
Build cost
£50k - £70k
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
81%
The average approval rate of projects in the last 2 years.
Time to approval
67 days
The average number of days taken to approve a project in the last 2 years.
Number approved
52,099
The number of applications approved in the last 2 years.
Loft outrigger dormer and internal alterations
Southwark
· Terrace
· 2022
£177k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Average build cost for a loft outrigger dormer extension is £50k - £70k
Build cost
£50k - £70k
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
81%
The average approval rate of projects in the last 2 years.
Time to approval
67 days
The average number of days taken to approve a project in the last 2 years.
Number approved
52,099
The number of applications approved in the last 2 years.
Loft main dormer, ground floor rear, loft outrigger dormer & internal alterations
Richmond upon Thames
· Semi Detached
· 2024
£314k
Excl VAT
Average build cost for a loft outrigger dormer extension is £50k - £70k
Build cost
£50k - £70k
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
81%
The average approval rate of projects in the last 2 years.
Time to approval
67 days
The average number of days taken to approve a project in the last 2 years.
Number approved
52,099
The number of applications approved in the last 2 years.
Loft outrigger dormer, internal alterations & internal alterations
St Albans
· Semi Detached
· 2022
£93k
Excl VAT
Average build cost for a loft outrigger dormer extension is £50k - £70k
Build cost
£50k - £70k
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
81%
The average approval rate of projects in the last 2 years.
Time to approval
67 days
The average number of days taken to approve a project in the last 2 years.
Number approved
52,099
The number of applications approved in the last 2 years.
Loft outrigger dormer and loft roof terrace
Wandsworth
· Flat
· 2023
£69k
Excl VAT
Loft outrigger dormer and internal alterations
Wandsworth
· Flat
· 2024
£67k
Excl VAT
AI images
Images are AI-generated for homeowner privacy
Loft outrigger dormer, loft mansard roof & internal alterations
Hackney
· Terrace
· 2023
£179k
Excl VAT
Ground floor side infill, loft outrigger dormer, Loft L shaped dormer & internal alterations
Waltham Forest
· Terrace
· 2022
£77k
Excl VAT
