J Johnstone Engineering recently fabricated and installed a double A-frame portal frame for an extension to an existing property in Braithwaite, near Keswick in the Lake District.
The project was completed for a builder we regularly work with, continuing a long-standing working relationship on projects across Cumbria.
The steel structure was designed to support a small upper-level balcony, with large glazed windows beneath and bifold doors opening from a bedroom onto the balcony. The design allows the property to maximise natural light and views across the surrounding Lake District landscape while maintaining strong structural support.
Structural Steel Framework for Balcony and Glazing
The primary structure consisted of a double A-frame portal frame fabricated from universal beam sections, forming the main structural support for the extension.
The frames were connected by a ridge beam, creating a stable structural system capable of carrying both roof loads and the balcony structure above.
The steelwork also incorporated multi-beam connection points, allowing additional structural beams to tie into the main frame where required. This configuration provided flexibility within the extension while maintaining the required structural strength.
The A-frames were positioned onto prepared concrete pad foundations, ensuring secure load transfer from the steelwork down into the supporting structure below.
Fabricated In-House to EN1090 Standards
All steelwork for the project was fabricated in-house at our Silloth workshop in Cumbria.
The structure was manufactured to EN1090 standards, with all welding carried out by our coded welding team. Each component was cut, drilled and assembled in the workshop before being prepared for delivery to site.
Keeping fabrication in-house allows us to maintain strict quality control and ensure every element is produced accurately to the structural engineer’s drawings.
Crane Installation on Site
Once fabrication was complete, the steelwork was transported to Braithwaite for installation.
The structure was lifted into position using a mobile crane, allowing the A-frames and ridge beam to be accurately positioned onto the prepared concrete pad foundations.
The frame was then secured using bolted connections, ensuring precise alignment and structural integrity in accordance with the design specifications.
Structural Steel Projects Across the Lake District
Projects like this demonstrate how structural steel can support modern architectural features such as balconies, large glazed openings and open internal layouts.
From our workshop in Silloth, Cumbria, J Johnstone Engineering regularly fabricate and install structural steelwork for projects across:
- Keswick
- Braithwaite
- Cockermouth
- Carlisle
- West Cumbria
- The wider Lake District region
With nearly four decades of experience, we continue to work with builders, developers and private clients on extensions, renovations and self-build projects requiring reliable structural steel solutions.
Structural Steel Fabrication in Cumbria
If you’re planning an extension, renovation or self-build project in Cumbria or the Lake District requiring structural steelwork, J Johnstone Engineering provides in-house fabrication and professional on-site installation tailored to each project.
