Construction of dormer windows as part of loft conversions. Covers structural alterations, weatherproof dormer cheek and roof construction, window installation, and lead or zinc flashings.
Typical cost
£14,000 — £22,000
Typical duration
2-3 weeks
Scope type
flexible
Typical tasks
Form structural opening and install trimmer rafters
Build dormer cheeks and flat or pitched roof
Clad cheeks in lead, zinc, or render on board
Install window and make weathertight
Integrate with main roof and reinstate tiles
Extras & additional works
Based on a standard dormer construction for a typical UK home, costs may increase if additional structural modifications are required or if high-end materials are chosen.
Common questions Stainesai
The cost of dormer construction can be affected by the size of the dormer, choice of materials, complexity of the roof integration, and access to the site.
Yes, dormer construction typically requires compliance with building regulations, including structural integrity and fire safety standards.
Constructing a dormer usually takes 2-3 weeks, depending on the complexity and size of the project.
Dormer cheeks are commonly clad in materials like lead, zinc, or render on board, depending on aesthetic and budget preferences.
Planning permission may be required for dormer construction, especially if it significantly alters the roofline. Additionally, Building Regulations approval is necessary for structural roofing work like dormers. Always confirm with your roofer before work begins.
Ready to post a dormer construction job?
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