Dormer Loft Conversions London

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Create a spacious, bright and practical new upper-floor living area with a professionally designed dormer loft conversion from LXR Construction. We specialise in high-quality dormer conversions across London, helping homeowners maximise headroom, increase natural light and transform unused loft space into functional rooms. Whether you’re adding a new bedroom, an office, a bathroom, or a full master suite, our team manages every stage — from initial design and planning to structural work and interior completion.

Why Choose a Dormer Loft Conversion?

  • More Headroom & Usable Floor Space – Dormers extend vertically from your existing roof, creating full-height walls and dramatically increasing usable space — perfect for bedrooms, offices or ensuite bathrooms.
  • Ideal for Terraced, Semi-Detached & Detached Homes – Dormer loft conversions suit almost every London property type and are often the most cost-effective way to add significant upper-floor living space.
  • Great Natural Light With Modern Window Options – With options such as dormer windows, Juliet balconies, and Velux rooflights, dormers make your loft brighter, airier and more inviting.
  • Minimally Disruptive & Highly Efficient Build – Compared to mansard or full roof lift conversions, dormers require fewer structural changes, making them faster and more budget-friendly while still delivering excellent space gain.
  • Increase Home Value & Living Potential – A dormer loft conversion can add both functional living space and substantial property value — often one of the highest-impact home improvements available.
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Our Step-By-Step Process to Building Your Dormer Loft Conversion

1

Consultation & Design

We begin by understanding how you plan to use the new loft space. Our design team explores dormer placement, head height, staircase positioning, window configurations and layout ideas. We then create a bespoke design that maximises space, comfort and natural daylight.

2

Planning & Approvals

Many dormer loft conversions fall under permitted development, but larger structures or those in conservation areas may require planning permission. We handle the entire process — drawings, planning submission, structural calculations, party wall notices and building regulations compliance.

3

Construction & Project Management

Our skilled dormer loft conversion builders deliver your project with precision and care. A dedicated project manager oversees structural alterations, dormer construction, steel installation, insulation, roofing, glazing, electrics, plumbing and interior fit-out. You receive regular updates throughout the build.

4

Completion & Interior Fit-Out

After the structural work is complete, we finish your loft conversion with flooring, plastering, bathrooms, lighting, bespoke joinery and full decoration. We then walk you through the completed space and carry out a thorough quality inspection to ensure every detail meets our standards.

How Much Does A Dormer Loft Conversion In London Cost?

Pricing depends on dormer size, roof structure, glazing options and internal finish. Typical costs include:

  • £40,000 – £70,000+ for a standard rear dormer
  • £70,000 – £110,000+ for large dormers with bathrooms or premium finishes
  • £110,000 – £150,000+ for L-shaped dormers (ideal for Victorian terraces)

A detailed, itemised quote is provided after your survey and design consultation.

Will a Dormer Loft Conversion Add Value to your home?

Yes. A dormer conversion can increase your home’s value by 10–25%, depending on how it is done and how much unused loft space you have available. If an unused loft space is converted with a dormer it can add new bedroom, bathroom or family room to your home which can significantly increase the square footage and increase the properties appeal.

Frequently Asked Questions

A dormer loft conversion adds a vertical extension to your sloping roof, creating more headroom and usable space inside the loft.

Some dormers fall under permitted development, but front-facing dormers or those in conservation areas usually need planning permission. We manage this for you.

Most dormer conversions take 8–14 weeks, depending on structural requirements and interior specifications.

Yes — dormers offer excellent space gain for a relatively low cost and are suitable for most property types.

Absolutely. Rear dormers often provide enough height for full bathrooms, making ensuites a popular addition.

An L-shaped dormer extends across the main roof and the rear roof of the property, creating a large, multi-room loft — commonly used in Victorian or Edwardian terraces.

Get a Free Quote – London Dormer Loft Conversion Specialists

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    Our Dormer Loft Conversion Services

    Rear Dormer Loft Conversions

    The most popular option — ideal for adding bedrooms, bathrooms or office space with excellent height and light.

    L-Shaped Dormer Conversions

    Perfect for Victorian and Edwardian properties, creating multiple rooms and maximum floor area.

    Full-Width Dormer Conversions

    Extend across the entire rear roof for exceptional headroom and a wide, open loft layout.

    Dormer Conversions With Juliet Balconies

    Add modern glazing and continental-style doors for more light and architectural impact.

    Velux + Dormer Hybrid Conversions

    Combine rooflights and a dormer structure for a bright, flexible loft design.