Loft Conversion Cost in London (2026)
A loft conversion in London typically costs between £42,800 and £64,200 - roughly 28% above the UK average. Higher local labour rates and strong demand are the main factors driving prices up.
£42,800–£64,200
Typical range
£53,500
Average cost
+28%
vs national avg
6–10 weeks
Typical duration
Free, no obligation. Quotes from vetted tradespeople in London.
Important: Building Regulations approval is required for all loft conversions. Most dormer conversions also require planning permission. A structural engineer must assess your roof and floor joists before work begins, and fire safety requirements (including a protected staircase) must be met.
London loft conversion prices
Prices below reflect the typical cost of a loft conversion in London, including materials and labour.
| Type | Details | London range | London avg |
|---|---|---|---|
| Velux / rooflight | Simplest type - roof windows, no structural changes | £25,700 – £38,500 | £32,100 |
| Dormer loft conversion | Most popular - extends the roof to create headroom | £42,800 – £64,200 | £53,500 |
| Hip-to-gable | Converts hipped roof to vertical wall plus dormer | £53,500 – £80,300 | £66,900 |
All prices include materials and labour. Based on contractor submissions and market data, April 2026.
What affects loft conversion costs in London
Loft conversions require a mix of specialist trades - structural work, roofing, carpentry, plumbing, electrics, and plastering. In London, skilled tradespeople typically charge £60–£90 per hour, and a full loft conversion involves several weeks of labour from multiple trades.
London has a huge range of property types, from Victorian terraces to modern new-builds. Older properties in inner London boroughs often require more preparatory work due to age and access constraints. The style of your roof has a big impact on cost. A simple Velux conversion on a property with good headroom is far cheaper than a hip-to-gable on a 1930s semi.
Scaffolding costs vary by region and property access. Scaffolding in London tends to cost 15–20% more than the national average due to access challenges and parking restrictions.
Demand for tradespeople in London is consistently high throughout the year, which means less room to negotiate on price. Loft conversions are one of the most popular home improvements in the UK, so good contractors tend to be booked well in advance.
How London compares
London loft conversion costs compared to other UK regions and the national average.
| Region | Average cost | vs national avg |
|---|---|---|
| LondonYou are here | £53,500 | +28% |
| National average | £42,000 | - |
| South East | £47,300 | +13% |
| East of England | £44,700 | +7% |
How to get your loft conversion for less in London
Choose a Velux conversion if your roof allows it
A Velux (rooflight) conversion is the cheapest type because it does not alter the roof structure. If your loft has enough standing headroom already - at least 2.2m at the ridge - this could save you tens of thousands compared to a dormer or hip-to-gable in London.
Use Permitted Development where possible
Many dormer loft conversions fall under Permitted Development, meaning you do not need to apply for planning permission. This saves time and fees. Check with your local council in London to confirm.
Get multiple quotes from London loft specialists
Loft conversion prices can vary by £5,000 to £10,000 between companies for the same job. Always get at least three detailed, written quotes and compare like for like.
Frequently asked questions
How much does a loft conversion cost in London?
Do I need planning permission for a loft conversion in London?
How long does a loft conversion take in London?
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