What Is a Structural Engineer and Do I Need One for My Building Project?

A structural engineer is a qualified professional who designs and assesses load-bearing structures — walls, beams, columns, foundations, and floors. For many home improvement and construction projects in Sheffield, their input is a requirement, not an optional extra.

What Does a Structural Engineer Do?

On a domestic construction project, a structural engineer's role typically includes:

- Designing the structural elements of an extension — the foundations, the new walls, the roof structure - Specifying the size and type of steel beam (RSJ) or concrete lintel required when removing a wall or creating a new structural opening - Assessing an existing structure before modifications are made — for example, checking whether a floor can take the additional load of a loft conversion - Preparing calculations that are submitted as part of the building regulations application

Their design must be followed by the contractor and will be checked by the building control inspector at key stages.

When Do You Need a Structural Engineer?

You will almost certainly need a structural engineer for:

- House extensions — structural calculations for foundations, new walls, and roof structure are required for building regulations approval - Loft conversions — particularly for dormer conversions, which alter the roof structure, and for any conversion where the floor structure needs strengthening - Removing a wall — any load-bearing wall removal requires a structural engineer to specify the beam and ensure the loads are transferred correctly - New builds — the full structural design of a new building requires structural engineering input

You may not need a separate structural engineer for very minor works — for example, fitting a new window in a non-load-bearing wall — but this should be confirmed with your building control officer.

How Much Does a Structural Engineer Cost?

Structural engineer fees for domestic projects vary by the scope and complexity of the work. Fees are typically charged as a fixed sum for straightforward projects. Your contractor should be able to advise on appropriate structural engineers to engage, or you can find chartered structural engineers through the Institution of Structural Engineers (IStructE) directory.

Think VPV's Approach

Think VPV works with structural engineers as part of the project team. Where your project requires structural engineering input, we advise on this at the outset and can recommend engineers we have worked with, subject to your preference. We do not proceed with structural works without the necessary engineering design in place.