Loft Conversions
Dormer Loft Conversion
A box-shaped structure that projects out from the roof slope, adding both headroom and floor area - the most common loft conversion type in the UK.
Start Your ProjectOverview
Is a dormer loft conversion right for your home?
A box-shaped structure that projects out from the roof slope, adding both headroom and floor area - the most common loft conversion type in the UK.
- Genuinely usable extra floor space, not just headroom
- A full-size window rather than a rooflight
- Terraced and semi-detached houses with limited roof pitch
Worth considering: The most involved of the simpler conversion types, since it breaks through the existing roofline - dormer loft conversion cost is one of the more affordable searches in this category, but the range still varies with dormer size.
Get My EstimateDo I need planning permission for a dormer?
Many dormer conversions fall under Permitted Development (Class B), which covers a roof extension up to 40m³ added volume on a terraced house or 50m³ on a detached or semi-detached house, set back at least 20cm from the original eaves and not extending beyond the highest part of the existing roof. A dormer that breaks any of these limits, or sits on designated land, needs a full planning application.
Building Regulations apply regardless of the planning route: structural strengthening for the new floor, fire escape provision, insulation and the dormer's own roof and wall construction all need to be signed off.
The Homespace difference
We don't rush the build. We remove the delays.
A property development background means the trades, materials and scheduling for your dormer loft conversion can be coordinated properly, so the project keeps moving without the build quality suffering.
Other loft conversion types
Other loft conversion types worth a look
Hip-to-Gable Loft Conversion
Extends a hipped (sloped) roof end out to a vertical gable wall, adding significant extra headroom and floor space along that side - common on detached and semi-detached houses with a hipped roof.
Learn more →Rooflight (Velux) Loft Conversion
The simplest and usually most affordable conversion: roof windows fitted flush into the existing slope, with no change to the roof shape itself.
Learn more →Mansard Loft Conversion
A near-vertical rear wall with a shallow-pitched roof on top, close to a full roof rebuild - the conversion type that typically adds the most usable space, and the one most likely to need full planning permission.
Learn more →Planning questions
Loft conversion FAQs
How long does a loft conversion take?
Timelines vary with the scope and structure of the roof, so we don't quote a fixed figure until a project has been properly assessed. Proper planning and coordinated trades are what keep a loft conversion moving.
Do I need planning permission for a loft conversion?
Many loft conversions fall under Permitted Development, but this depends on your roof, your property and its planning history. We'll help you understand what applies before design work begins.
Does a loft conversion add value to a house?
Adding a genuine extra bedroom or bathroom is one of the more reliable ways to increase both usable space and value, though the actual uplift depends on your property, its current layout and the local market. We won't quote a specific percentage without knowing those details.
What loft conversion types do you offer?
Dormer, hip-to-gable, rooflight (Velux) and mansard - each suited to different roof shapes and different budgets. See our loft conversion types for what each involves and which roofs they suit.
Ready to make more of your home?
Tell us what you're thinking and let's see what's possible.
Start Your ProjectMore Space, Built to Last.