Knocking Down a Wall: A Structural Engineer’s Guide and General Process

As structural engineers, we are often asked by clients if they can remove a wall in their house or building. Knocking down a wall is a major change that requires careful planning and execution to ensure safety and success. Here is an overview of the general process we recommend for safely and successfully removing a load bearing wall:

Assessment and Planning

• Evaluate the wall and its purpose. Determine if it’s load bearing or non-load bearing. load bearing walls support the structural integrity of the building, while non-load bearing walls are primarily for separation or division of space.
• Consult a structural engineer. If you’re unsure whether the wall is load bearing or not, it’s crucial to seek professional advice.  If the wall is load bearing, the Structural Engineer will produce structural calculations and specifications for necessary components, such as steel, lintel, floor joists, and roof joists to support the building.
• Plan the project. Submit the Structural Engineer’s Report to builders for obtaining quotations for the structural work.  Consider any electrical wiring, plumbing, or HVAC systems that may be present in the wall. Check if these need to be rerouted or removed before demolition.
• Notify the Local Authority Building Regulation Department/Building Control of the planned works. Submit the Structural Engineer’s Calculations/Report to your local Building Control Department upon request.
• Select a competent builder of your choice to safely execute the alteration work.

Structural Considerations

• If the wall is load bearing, temporary supports will need to be provided before removal. This typically involves installing temporary props, needling beams, or braces to carry the load above while the wall is demolished.
• Nearby walls or floors should be strengthened if necessary to compensate for the removed support.
• Padstones should be installed at the proposed beam supports / piers to provide a safe bearing for the new beam and wet mortar must be allowed to dry.
• Install new structural supports. Follow the structural plans for beam, post, and header sizes and locations. Nail or bolt new framing into place, ensuring load paths are intact. Heavy steel beams should be installed using lifting equipment e.g. Genie lift or similar.
• To minimise deflections of the existing structure, the new beams must be securely pinned to the existing construction with slate or dry-pack mortar, and all mortar must be allowed to cure before removing the temporary supports or props. 

Inspection

• Invite the Local Authority Building Control Officer to inspect the works at various key stages, including foundation founding level depth, steel beams, roof structures, and electrical installations. 
• Have the new structure inspected before closing up the wall.
• Notify Local Authority Building Control to issue a Certificate of Compliance and Completion of work.

Completion

• Inspect, insulate, and finish. Add insulation, drywall, trim, and paint to blend the new wall appearance with the rest of the room.

Remember, knocking down a wall involves potential hazards and may require permits or professional assistance depending on the scope of the project. Always prioritise safety and consult with experts when in doubt.

Whether you have an extension project that needs beams or any other type of structural work, our experienced and fully qualified structural engineers are all experts in the design, drawing and calculation for single-beam and multi- beams, columns, padstone designs, steel connections and more.

Our structural calculations and drawings are suitable for your contractor and local authority building control submissions. To find out more about how we can help you, get in touch with IKT Consulting today.