Calculate your loft conversion costs instantly with our 2025 Loft Conversion Cost Calculator. Get accurate price estimates for dormer, hip-to-gable, and mansard conversions in London, helping you plan your budget with confidence and transparency.
Get a quick UK cost estimate based on your loft type and property size. Final quotes may vary after a full survey.
Complete the form and we’ll estimate your loft conversion cost based on type and property size.
*Use this as an early budgeting tool only. For an accurate price, we’ll need a site visit, drawings and a detailed specification.
We help homeowners turn unused space into stylish, functional areas without overspending. Whether you’re designing a new bedroom, a family lounge, or transforming the loft into a modern study, our team provides accurate cost estimates tailored to your budget and lifestyle.
From material selection to labour costs and planning permissions, every detail is carefully considered to ensure transparency and affordability. We focus on smart design solutions that maximise your space while keeping your extension or loft conversion costs realistic. With a commitment to quality and customer satisfaction, we guide you through each stage from budgeting to final build, ensuring your project is completed on time, within budget, and with exceptional craftsmanship.
A Velux loft conversion is one of the simplest and most cost-effective ways to add light, space, and value to your home. It involves installing Velux roof windows into the existing roof slope without major structural changes, allowing natural light to flood your loft while keeping it budget-friendly. This type of conversion works exceptionally well in lofts with good head height, making it ideal for creating a bright and airy bedroom, office, or hobby room. Installation is typically faster than other loft types, reducing disruption to your daily routine. With minimal construction work required, Velux loft conversions remain a popular choice for homeowners who want maximum impact with minimal investment. They also comply easily with most permitted development rules, making the planning process much simpler.
A Dormer loft conversion adds extra headroom and usable floor space by extending the roof vertically, creating a box-shaped structure that projects from the existing roof and feels like a natural part of your home. Many homeowners look into the dormer extension cost early on to plan their budget sensibly, as understanding the cost for dormer upgrades helps compare different conversion options. A dormer is ideal for adding bedrooms, offices, or bathrooms with more light, comfort, and better layout flexibility. It improves ventilation and maximises every inch of the loft, making previously unused space truly functional. The dormer extension cost is often one of the most affordable ways to expand living space in the UK, offering practicality, added value, and a seamless extension to your home.
An L-shaped loft conversion with a balcony offers added floor space along with outdoor relaxation. This style extends over the main roof and rear addition, creating a seamless L-shaped loft extension that allows natural light and fresh air to flow throughout the space. Ideal for master bedrooms or creative studios, it enhances both aesthetics and property value while offering a unique architectural layout. The extended footprint provides more design freedom, allowing for spacious wardrobes, en-suites, or study areas. Overall, an L-shaped configuration delivers a premium upgrade that maximises comfort, privacy, and modern living potential.
A Half L-shaped loft conversion extends only part of the rear roof, making it a more affordable alternative to the full L-shape. It provides additional space for a bedroom, office, or storage without requiring a major structural change. This partial L-shape loft extension is perfect for smaller homes needing functional space on a limited budget while keeping the overall build light and efficient. It works especially well in properties with a rear addition, allowing smart use of unused attic space. With a compact loft design and improved layout options, it offers a practical upgrade that boosts comfort, usability, and long-term value.
The L-shaped loft conversion with full back addition combines both rear and main roof extensions to create a large, continuous living area. It’s perfect for spacious bedrooms, en-suite bathrooms, or multiple rooms, offering a generous layout that feels like a natural expansion of the home. This design maximises space in Victorian and Edwardian properties and blends seamlessly with the existing structure. With its full-width rear addition and extended footprint, this type of loft extension offers exceptional flexibility for modern living. It’s ideal for homeowners looking to achieve a complete attic transformation while increasing comfort, practicality, and overall property value.
A Hip to Gable loft conversion extends the sloping side of a roof into a vertical gable wall, creating far more internal headroom and usable floor space. It’s commonly used in semi-detached and detached homes, offering a strong structural base for additional upgrades such as dormer extensions. Many homeowners explore the hip to gable loft conversion cost early in the planning stage to understand the investment needed, while comparing the overall hip to gable loft conversion price with other loft types. This style is ideal for growing family needs, providing flexibility, comfort, and long-term value. With most hip-to-gable loft conversions, the transformation feels seamless, maintains the property’s aesthetics, and significantly improves functionality. It’s a reliable choice for creating bedrooms, offices, or en-suite spaces while maximising every inch of your loft.
An L-shaped Mansard loft conversion combines a rear mansard roof with an extension over the back addition. It provides maximum internal space with near-vertical walls and a flat roof design, giving your home a spacious and practical layout. This option is ideal for creating multiple rooms and offers a stylish, townhouse-style finish with increased property value. The mansard roof extension works perfectly for period homes with rear additions, allowing a complete attic transformation without compromising the exterior look. With its generous footprint and spacious loft layout, it’s suitable for luxury bedrooms, en-suites, or studio-style living. The L-shaped structure also enhances natural light and delivers a clean urban townhouse look while making excellent use of every corner.
A Double Mansard loft conversion adds mansard structures to both the front and rear of your roof, creating a full additional floor. This design offers outstanding headroom, natural light, and excellent versatility throughout the new level. It’s perfect for homeowners wanting multiple bedrooms or a luxury suite, especially in urban terraced properties. With its dual mansard roof layout, this style provides a full-width loft extension that feels like a genuine extra storey. The near-vertical roof angle allows more usable space, making it ideal for period terraces with limited attic height. As a complete attic level upgrade, it delivers remarkable comfort, expanded living space, and a premium loft renovation that significantly boosts long-term property value.
With 15+ years of experience, we specialize in loft conversions, roofing, and garden rooms. As a family business, we focus on quality, clear communication, and client satisfaction.
