Steel Beam Sizes for Wall Removal: RSJ Sizing & Cost Guide

Why Steel Beams Are the Smart Choice

Steel is an incredibly popular choice for home renovations, and for good reason. It has a high strength-to-weight ratio, meaning a smaller, more discreet beam can support a significant load. This makes it a smart, cost-effective, and sustainable choice for projects like creating an open-plan living space.

Using the correct steel beam (or RSJ) is essential for your project's safety. A properly sized steel beam is designed to withstand high loads with minimum deflection, which prevents movement and cracking of brittle finishes like masonry and plaster.

Key Benefits of Using Steel Beams

Steel beams offer several advantages for residential wall removal projects:

• Sustainable and cost-effective — less material is required compared to other options, making it a smart financial and environmental choice
• Prevents cracks — by preventing deflection and movement, a well-designed steel beam protects your new finishes from future cracking
• Precision engineering — beams are manufactured to exact sizes and strengths, ensuring a perfect fit and reliable performance
• Exceptional strength — steel is incredibly strong, allowing it to support heavy weights with a compact size, making it a less intrusive option than wooden supports

Steel Beam Size Table: A Quick Reference

When a wall is removed, a new support structure is needed to carry the loads of the building above. The following table lists some commonly used steel beam sizes for small UK projects.

Note: This table is for guidance only. Your project will require a professional assessment to determine the exact size and specifications.

Calculating the Correct Steel Beam Size

While the table above is a helpful reference, making sure that you use the right size of steel beam is a critical part of the project. Every property is different, and the loads from above can vary significantly. That's why it's essential to have a qualified structural engineer perform the necessary calculations.

An engineer will consider multiple factors, including the span of the opening, the type of masonry above, and the load from the floors and roof. This is the only way to ensure your new open-plan space is safe and compliant with all Building Control regulations.

Need professional help with this?

Wall Removal Calculations — fixed price from £450, including site visit and Building Control-ready documentation.