A loft conversion is one of the most cost-effective ways to add space and value to your London home. Crown Architecture specialises in designing loft conversions that maximise every inch of your roof space, creating beautiful, functional rooms that transform how you live.

From simple Velux conversions to full mansard extensions, our expert architects design loft conversions that balance your vision with planning requirements and structural constraints. We handle the entire process — from initial concept and planning drawings to building regulations compliance and structural calculations.

Types of Loft Conversion We Design

• Dormer Loft Conversions — The most popular type, adding a box-shaped extension to the roof slope to create full headroom and usable floor space.
• Hip-to-Gable Loft Conversions — Ideal for semi-detached and detached houses, converting the sloping hip roof into a vertical gable wall.
• Mansard Loft Conversions — The most spacious type, creating a near-vertical rear wall at 72 degrees for maximum volume.
• Velux / Roof Light Conversions — The most affordable option, simply adding roof lights to an existing loft space.
• L-Shaped Loft Conversions — Perfect for Victorian and Edwardian terraces with a rear extension.

What's Included in Our Loft Conversion Plans

• Measured survey of existing property
• Existing floor plans and roof structure drawings
• Proposed floor plans showing new room layout
• Elevations showing external appearance changes
• Roof plan and sections
• Planning application preparation and submission
• Building regulations drawings (structural details, insulation, fire escape)
• Structural calculations for new steel beams
• 3D visualisation of finished space