Types of Loft Conversion in the UK (And How to Choose the Right One)

Loft conversions are one of the most effective ways to expand your living space without moving house. 

With the right design and planning, you can add a bedroom, office, or even a full suite - all within the existing footprint of your home.

But choosing the right type of loft conversion isn’t as simple as picking the one you like the look of. 

It depends on your roof shape, structural possibilities, planning restrictions, and, of course, your budget.

We know this can be confusing, so today, we will break down the different types of loft conversions, give you a rough guide of how much they typically cost, and help you decide which one is right for your property.

Why Consider a Loft Conversion?

Before diving into the types, it’s worth understanding why loft conversions are such a popular choice for homeowners:

• Adds usable space: Make use of otherwise wasted attic space.

• Increases property value: A well-executed loft conversion can add up to 20% to your home’s market value.

• Cheaper than moving: Avoid stamp duty, estate agent fees, and the stress of relocating.

• Tailored to your needs: Whether it's a home office, guest room, or master suite, you can design it to suit your lifestyle.

The 4 Main Types of Loft Conversion in the UK

Each type of loft conversion offers different advantages and is suited to different types of property. 

Here's a detailed breakdown of the main types:

1. Velux (Rooflight) Loft Conversion

This is the most straightforward and budget-friendly option. It keeps your existing roof structure intact and simply adds rooflight windows (Velux or similar), along with flooring, insulation, and internal works.

Ideal for: Homes with high rooflines and plenty of headroom.

Key benefits:

• Minimal disruption and build time

• Retains the external appearance of your home

• Typically doesn't need planning permission
  

Considerations:

• Usable space is limited

• Less flexibility in layout

• Natural light only from the rooflights
  

Estimated cost: £30,000 – £40,000

2. Dormer Loft Conversion

A dormer conversion adds a box-shaped structure to the slope of your roof. It increases floor space, headroom, and allows for conventional vertical windows.

Ideal for: Terraced and semi-detached homes with sloping roofs.

Key benefits:

• More internal space and flexibility

• Excellent light and ventilation

• Often considered permitted development
  

Considerations:

• It alters the appearance of your home

• May require planning permission in conservation areas

• Costs more than a Velux conversion
  

Estimated cost: £50,000 – £58,000

There are variations, too:

• Flat-roof dormer (most common, more spacious)

• Gable-fronted dormer (more aesthetically pleasing, slightly costlier)

• L-shaped dormer (ideal for Victorian and Edwardian properties with back additions)
  

3. Hip-to-Gable Loft Conversion

This type involves converting the sloped ‘hip’ end of a roof into a vertical wall (gable), extending the ridge line and maximising internal space. It’s often combined with a dormer for even more room.

Ideal for: Detached or semi-detached houses with hipped roofs.

Key benefits:

• Creates substantial space, especially with a dormer

• Blends well with existing architecture

• Increases property value significantly
  

Considerations:

• Structural complexity and longer build time

• Not suitable for mid-terrace homes

• Planning permission may be required
  

Estimated cost: £55,000 – £65,000

4. Mansard Loft Conversion

This is the most comprehensive - and expensive - option. It involves replacing one or both roof slopes with a new structure, typically with a flat roof and steep rear wall, creating an almost full additional storey.

Ideal for: Homeowners seeking maximum space, particularly in urban areas.

Key benefits:

• Creates a large, flexible space

• Ideal for multiple rooms or a large suite

• Great for resale value
  

Considerations:

• Almost always requires planning permission

• High cost due to structural changes

• More disruption during build
  

Estimated cost: £50,000 – £70,000+

Planning Permission and Building Regulations

In many cases, loft conversions fall under permitted development rights, which means you don’t need formal planning permission. However, this depends on:

• The type of conversion

• Location (e.g. conservation areas)

• Volume of the extension (typically limited to 40–50m³)
  

Regardless of planning permission, all loft conversions must comply with building regulations. This covers structural safety, insulation, fire safety, and staircase access.

Always consult your local authority or planning consultant to be sure.

What Is The Best Loft Conversion For You

There’s no one-size-fits-all answer to this question. The best loft conversion depends on a mix of practical and personal factors, such as:

1. Your existing roof structure: Is it trussed or traditional? What’s the head height?

2. Your budget: Simpler conversions like Velux cost less, while mansards come at a premium.

3. Your goals: Are you creating a single room or a full suite? Do you need plumbing or extensive electrical work?

4. Planning restrictions: Some areas, particularly conservation zones, have tighter rules.

5. Property type: Certain conversions suit terraced homes, others suit detached or end-of-terrace properties.
   

Real-World Example Scenarios

Take a look at these examples to understand how different loft conversions can apply in varying circumstances:

• A budget-conscious family in a semi-detached home might opt for a rear dormer, gaining a child’s bedroom and a small shower room.

• A professional couple in a city terrace may invest in a mansard to create a self-contained master suite.

• Downsizers seeking a hobby space or home office may only require a Velux conversion.
  

Our Final Tips Before You Start The Process

Before you opt for a loft conversion, take a look at our tips:

• Check feasibility first: Get a loft survey from a builder or architect.

• Use professionals: Don’t cut corners on structural or design work.

• Budget realistically: Factor in finishes, bathroom fittings, and unexpected extras.

• Think about access: Will a new staircase fit without affecting key rooms?
  

If you want to talk about your options, we’re here to help - you don’t have to figure it out alone.

A Quick Recap

A loft conversion can be transformative - not just for your space, but for your lifestyle and property value, too. 

The key is to choose the right type based on your home’s structure, your needs, and your budget.

Take your time to plan it properly, and work with experienced professionals who understand the regulations, design considerations, and construction challenges.

If you’re thinking about a loft conversion, we’d be happy to help. At Corsol Conversions, we offer honest advice, practical design solutions, and a no-pressure approach. Whether you’re ready to build or just weighing up your options, get in touch for a friendly chat.