Common Structural Mistakes in DIY Projects (and how to avoid them)
Updated: Oct 6
DIY home improvements can be a great way to transform your property, but some projects go beyond decorating and straightforward renovation work.
When a project involves walls, floors, roofs, foundations or other structural elements, getting the structural design right before construction begins is important. The right drawings and calculations can help ensure the proposed work is safe, buildable and ready for Building Regulations approval.
Here are five common mistakes homeowners can avoid when planning structural alterations.
1. Removing a Load-Bearing Wall Without a Structural Design
Creating an open-plan kitchen or larger living space often involves removing an internal wall. However, some walls support floors, roofs or other parts of the building above.
If a load-bearing wall is being removed, a suitable structural support will usually need to be designed to replace it.
A structural engineer can calculate the loads involved and design the required steel beam or other supporting structure. Structural drawings and calculations can then be provided for Building Control and the construction team.
If you're planning this type of project, find out more about our load-bearing wall removal structural engineering services.
2. Choosing a Steel Beam Without Structural Calculations
Steel beams, often referred to as RSJs, are commonly required for extensions, wall removals and other structural alterations.
The size of the beam cannot simply be chosen based on what has been used in another property. The required specification depends on factors including the span, loads being supported, bearing arrangements and the surrounding structure.
Structural calculations establish the appropriate beam specification for the individual project, while structural drawings show how it should be incorporated into the proposed work.
3. Treating Foundation Design as an Afterthought
Foundations are a fundamental part of extensions and new-build projects and should be considered as part of the structural design from the outset.
The appropriate foundation solution will depend on the proposed building, the loads being transferred and the conditions relevant to the project.
A structural engineer can design the foundations required for the proposed structure and provide the necessary drawings and calculations for Building Regulations and construction.
Planning this work early also helps ensure the foundations and the structure above are designed as part of the same overall solution.
4. Adding Loads Without Considering the Existing Structure
Projects such as loft conversions and roof alterations can change how loads are transferred through a property.
Creating new rooms, altering roof structures or introducing new structural elements therefore needs to be considered as part of the overall design.
A structural engineer can calculate the relevant loads and design the supporting elements required for the proposed work.
This gives the builder clear structural information to follow rather than relying on assumptions during construction.
5. Altering a Roof Structure Without a Structural Design
Loft conversions frequently require changes to the existing roof structure to create usable space.
Existing structural elements shouldn't simply be removed to make room for a new layout. The proposed alterations need to be designed so that loads continue to be transferred safely through the structure.
Depending on the project, the structural solution could include new steel beams, timber members or other supporting elements.
Structural drawings and calculations provide the construction team with a clear design showing how these alterations should be carried out.
Plan Structural Work Before Construction Begins
The common thread running through all of these projects is planning.
Bringing a structural engineer into the project before structural work starts means the required design, drawings and calculations can be prepared in advance.
This can help:
Give Building Control the structural information required for the proposed work
Provide builders with clear structural drawings to work from
Reduce the likelihood of structural changes being required during construction
Help the project progress more smoothly from design to build
Structural engineering should therefore be considered as part of the project planning process, rather than something to address once construction is underway.
Planning a Residential Building Project?
Pavol Zajac Structural Engineers Ltd provides structural design, drawings and calculations for residential building projects, including house extensions, loft conversions, load-bearing wall removals, structural alterations, foundations and new-build homes.
If you're planning structural changes to your property, get in touch to discuss your project and request a free quote.
Contact us today to discuss your plans.
