Eyebrow Dormer Craftmanship, Process and Precision Roofing

Completed for Level Up Developments

Designed by H3 House Architects

Eyebrow dormers are among the most distinctive and technically demanding features in traditional and high-end roofing. Their smooth, flowing curves and understated elegance hide a complex construction process that only skilled, experienced roofers can execute correctly. When built and roofed properly, an eyebrow dormer enhances both the architectural value and long-term performance of a roof.

At Rosbo Roofing, we recently completed a full thatched roof strip and a new eyebrow dormer roof finished in Val de Seine clay tiles for Level Up Developments, on a property designed by H3 House Architects. The project is a perfect example of the level of craftsmanship required to deliver this type of work to the highest standard.

What Is an Eyebrow Dormer?

An eyebrow dormer is a low-profile dormer with a curved roof that rises smoothly from the main roof slope and returns back into it without vertical sides. Its name comes from its resemblance to the gentle arch of an eyebrow. Unlike traditional box dormers, eyebrow dormers prioritise architectural flow and visual harmony over internal space.

They are commonly used on:

• Period and heritage properties

• High-end residential developments

• Architect-designed homes where rooflines are a key design feature

The Process: How an Eyebrow Dormer Is Built and Roofed

Building and roofing an eyebrow dormer is a multi-stage process that demands planning, precision, and a deep understanding of traditional roofing techniques.

1. Stripping the Existing Roof

On this project, the first stage involved a full strip of the existing thatched roof, allowing for a complete rebuild of the roof structure to accommodate the new dormer. This stage is critical, as it provides clear access to assess structural integrity and ensure the new works integrate seamlessly with the existing building.

2. Structural Carpentry and Dormer Formation

The curved form of an eyebrow dormer begins with bespoke timber framing. Every rafter and support must be individually set out and shaped to achieve a smooth, symmetrical curve. There are no straight lines to hide behind—any inaccuracy will be visible once the roof is finished.

This stage requires close collaboration between roofer, carpenter, and architect to ensure the dormer aligns perfectly with the design intent set out by H3 House Architects.

3. Preparing the Roof for Tiling

Once the structure is complete, the roof is prepared with:

• High-quality breathable membranes

• Precisely set battens that subtly adjust to the changing curve

• Careful detailing around junctions and abutments

Water management is a major consideration at this stage, as eyebrow dormers introduce multiple water paths that must be controlled correctly.

4. Roofing the Curve with Val de Seine Clay Tiles

Roofing an eyebrow dormer in Val de Seine clay tiles is a skilled task in itself. Clay tiles are durable, attractive, and well-suited to traditional and architectural builds—but they do not naturally conform to curved surfaces.

To achieve the correct finish, our team:

• Hand-selected and cut tiles to suit the curve

• Used diminishing tile courses to maintain consistent lines

• Ensured each tile sat flat and secure to prevent future movement

This level of detail ensures both visual excellence and long-term weather resistance.

5. Leadwork and Finishing Details

Expert leadwork is essential on an eyebrow dormer. Flashings and soakers must be dressed to follow the curve precisely while remaining discreet and effective. Poor lead detailing is one of the most common causes of failure on complex dormers.

The goal is always the same: a dormer that looks like it has always been part of the roof, with no harsh transitions or visible compromises.

Why Eyebrow Dormers Demand Specialist Roofing Skills

Eyebrow dormers sit firmly in the realm of specialist roofing. They require:

• Extensive hands-on roofing experience

• Knowledge of traditional and heritage techniques

• The ability to work accurately without straight reference lines

• Patience and pride in craftsmanship

This is not work suited to general or inexperienced roofing contractors.

A Collaborative Architectural Finish

This project highlights the importance of collaboration between developer, architect, and roofing contractor. Working with Level Up Developments and H3 House Architects, Rosbo Roofing delivered a roof that meets both the aesthetic vision and the technical demands of a modern, architect-led build.

Final Thoughts

A well-executed eyebrow dormer is more than a roof feature—it is a statement of quality and craftsmanship. From structural carpentry to hand-laid clay tiles, every stage must be carried out with care and expertise.

At Rosbo Roofing, we specialise in complex roofing projects, including eyebrow dormers, heritage roofs, and architect-designed builds. When the details matter, experience makes all the difference.