Most Popular Loft Conversion Styles

Honestly, if you're looking to add space and value to your home, a loft conversion is probably your best bet. But the style you go for? That depends on your roof, your budget, and what the council will let you get away with. Right now, based on what people are actually searching for, four styles are leading the pack: Velux, Dormer, Hip-to-Gable, and Mansard. Each one gives you something different—cost, space, looks.

So here's a breakdown of what's popular, answers to questions homeowners keep asking, and a clear comparison. Hopefully, it helps you figure out what works for you.

Which loft conversion style adds the most value?

Look, all of them add value—no doubt. But if you're after pure square footage and ceiling height, the Mansard is the winner. It's also the priciest and a real headache to sort out. For most semi-detached or terraced houses, though, a Dormer hits that sweet spot. You're looking at maybe 15% to 20% added to the property value without breaking the bank.

The trick is matching the style to your house. A Dormer that fits a Victorian terrace? That'll add more than some poorly done Mansard that looks out of place.

What is the difference between a Dormer and a Velux loft conversion?

This is the one everyone asks about. The main difference is how you create the space:

• Velux (Rooflight) Conversion: This is the simplest and cheapest. You put in windows—usually Velux brand—that sit flush with the roof. No changing the roof shape. Good if you already have enough headroom up there.
• Dormer Conversion: You build a box-like structure that sticks out from the roof. This gives you loads more floor space and headroom. Perfect if your attic's too low to do anything with.

Put simply: Velux is for letting light into a space that's already tall. Dormer is for making space where there isn't any.

Is a Hip-to-Gable conversion worth it?

Yeah, absolutely. Especially if you've got a detached or semi-detached house with a hipped roof—that's where it slopes on all sides. A hip-to-gable conversion turns that sloping side into a vertical gable end, so you get a much bigger loft floor area. It's cheaper than a Mansard but gives you way more space than a basic Dormer. Honestly, for the right roof shape, it's one of the best value options out there.

How much space does a Mansard loft conversion add?

The Mansard is the king of space. You basically redo the entire roof to create a nearly vertical wall at a 72-degree angle, with a flat roof on top. This maximises floor space and headroom across the whole loft. It can add a whole extra storey. But because it changes the roof line so much, you need planning permission, and it's the most expensive option by far.

You mostly see it on terraced houses or in conservation areas where everything needs to look uniform.

Loft Conversion Styles Comparison Table

Loft Conversion Checklist: 5 Steps Before You Start

• Check Head Height: You need at least 2.2m of clear head height in the centre of the loft. If not, you're looking at a Dormer or Mansard.
• Check Permitted Development: Most Dormers and Hip-to-Gable conversions fall under this, but there are volume limits—usually 40-50 cubic metres for terraced houses.
• Consider Party Wall Agreements: If you share a wall with a neighbour, you've got to let them know.
• Plan for Stairs: You need a fixed staircase. That eats up space on the floor below, so think about it.
• Insulation & Fire Safety: Building regs now demand good insulation and fire-resistant doors. Don't skip this.

Frequently Asked Questions