Dormer Loft Conversion Cost in the UK
Dormer Loft Conversion Cost in the UK — 2025 Price Guide
Thinking about adding more living space to your home?
A dormer loft conversion is one of the most popular ways to extend upwards — creating extra headroom, light, and value.
If you’re searching for “dormer loft conversion cost UK”, this guide explains average prices, what affects costs, and how to compare free quotes from verified builders through SCE Marketplace.
What Is a Dormer Loft Conversion?
A dormer loft conversion adds a vertical extension to your roof, creating usable floor space and increasing natural light through vertical windows.
It’s ideal for turning an attic into a full bedroom, home office, or ensuite.
Average Dormer Loft Conversion Costs in the UK
As of 2025, a typical dormer loft conversion in the UK costs between £30,000 and £45,000.
Prices vary depending on property size, location, and the complexity of the design.
- Basic Rear Dormer Conversion: £30,000 – £35,000
- L-Shaped Dormer Conversion: £40,000 – £45,000
- Flat-Roof Dormer with Ensuite: £45,000 – £55,000
In London or the South East, you can expect to pay around 15–20% more due to higher labour and material costs.
What Affects Dormer Loft Conversion Costs?
1. Loft Size & Roof Type
The bigger the loft and the steeper the roof pitch, the more work is needed — which increases costs.
2. Type of Dormer
A simple rear dormer is cheaper, while an L-shaped dormer or multiple dormers require more materials and structural changes.
3. Internal Finishes
Adding bathrooms, bespoke furniture, or premium materials increases your total spend.
4. Planning & Building Regulations
Most dormer conversions fall under permitted development, but always confirm with your local council.
Cost Breakdown Example
| Item | Approx. Cost |
|---|---|
| Design & Structural Drawings | £1,000 – £2,000 |
| Building & Labour | £25,000 – £35,000 |
| Windows & Roofing | £2,000 – £4,000 |
| Electrical & Plumbing | £1,000 – £3,000 |
| Decoration & Finishes | £1,500 – £3,000 |
Get Free Dormer Loft Conversion Quotes
Finding the right builder for your dormer loft project can be challenging — but SCE Marketplace makes it simple.
- Describe your loft conversion project in a few clicks.
- Receive multiple no-obligation quotes from verified builders near you.
- Compare prices, reviews, and timelines before choosing the best one.
Save money, compare builders, and turn your loft into a stylish living space with trusted UK professionals.
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