Loft Conversions
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.
Start Your ProjectOverview
Is a mansard loft conversion right for your home?
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.
- Maximising floor area and headroom across the whole loft
- Period terraced properties, where mansards are an established local form
- Projects where the extra space justifies the larger scope of work
Worth considering: The most structurally involved of the four types, and because it alters the roof so substantially, it very often falls outside permitted development and needs a full planning application - particularly on designated land.
Get My EstimateWhy a mansard almost always needs planning permission
A mansard replaces most of the existing roof with a near-vertical rear wall and a shallow-pitched roof on top - close to a full roof rebuild rather than a conversion of what's there. That scale of change to the roof's shape and appearance sits outside what Permitted Development Class B allows, so a mansard conversion very often needs a full planning application, and almost always does on designated land such as a conservation area.
In return, it typically adds the most usable floor area and headroom of the four types, which is why it's an established form on period terraced properties in particular, where the roofline was often designed with a mansard-style addition in mind from the outset.
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 mansard 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
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.
Learn more →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 →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.