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Do I Need a Structural Engineer for My Project?

31st July 2025

Structural engineering plays a key part in a wide range of commercial and residential architecture projects. In spite of this, it’s not uncommon for customers to feel unsure about what structural engineers do and whether they need one for their project.

To help clear things up, we’ll be exploring the types of work structural engineers typically get involved with, as well as the vital actions they take to keep buildings safe and compliant. So, if you’re wondering, ‘Do I need a structural engineer for my project?’, don’t go anywhere. As trusted building consultants with many years of experience, we have all the answers you need.

What Does a Structural Engineer Do?

Whether they’re working on a person’s home or helping to advise on a piece of commercial architecture, a structural engineer’s primary responsibility is to assess the safety and practicality of a structure by evaluating its material properties, anticipated loads, and how it will respond to various stressors. 

Structural engineers are deeply involved in both the design and construction phases of a project, often collaborating closely with architects, surveyors, and civil engineers. This close collaboration allows them to understand every aspect of the build and provide feedback and support as often as needed.

What Are Structural Calculations? 

Put simply, structural calculations are the technical designs structural engineers devise to make sure that building work is structurally sound and follows UK Building Regulations. These calculations help to evidence and explain exactly how structural parts like beams, walls, and foundations should be built. They also help to specify what materials to use and how everything will work together to carry loads safely.

When Might You Need a Structural Engineer?

Structural engineers aren’t normally needed for small-scale/non-invasive projects like swapping windows in existing openings, installing simple kitchens (as long as you’re not cutting through joists), retiling floors, or changing radiators. However, any work that changes load distribution, introduces new or increased weight, removes or alters supports, or addresses ground movement requires detailed engineering calculations and designs.

Having detailed calculations for these types of projects allows you to guarantee safety and ensure you’re able to secure Building Regulations approval.

Types of Projects That Require a Structural Engineer

Still unclear about whether or not you require a structural engineer for your project? You’ll need the help of a structural engineering professional if you plan to: 

  • Build an extension: If you’re adding new floors, roofs, or walls, your structural engineer will check the foundations and load paths so that your new addition doesn’t crack or settle.
  • Remove or alter load-bearing walls: If you take out the wrong wall, your ceiling (or worse) could sag or collapse. Your engineer will use precise structural calculations to ensure steel beams or lintels are sized and placed correctly.
  • Convert a loft or garage: Floors, dormers, and stair openings introduce loads where none existed previously. To ensure these elements don’t cause issues, your structural engineer will design reinforcements so that joists, rafters, and foundations all carry the extra weight.
  • Install oversized glazing, bi-folds, or large openings: Big glass doors need new steel supports above them. If you get the beam size or bearing detail wrong, you risk cracking, water ingress, or failure under wind load. Your engineer is there to ensure this doesn’t happen.
  • Underpin or fix subsidence: When ground movement or weak soil causes your walls to sink, a structural engineer can diagnose the cause and design underpinning to stabilise the whole structure.
  • Raise or alter the roof structure: Finally, adding height or reshaping rafters changes how loads travel down to walls and foundations. To keep your structure safe, you’ll need precise drawings that ensure you avoid overloading existing members.

Without a structural engineer’s detailed calculations, these types of projects come with a whole host of risks that can endanger people both inside and outside of the building. That’s why it’s so important to work with an experienced engineering professional.

What Does a Typical Structural Engineering Report Look Like?

A structural engineering report is a multipage document that acts as a formal summary of a proposed project. This tends to include:

  • An introductory overview outlining the scope, site address, and client details.
  • A structural inspection of accessible areas, noting any cracks, deflection, or corrosion.
  • A structural assessment of load?bearing elements like walls, beams, and foundations with calculations where needed.
  • A defect log to identify any issues with subsidence, settlement, or material deterioration, plus probable causes.
  • Engineering recommendations. This might include remedial works, specification of beams or underpinning, repair methodologies, and sequencing.
  • A breakdown of cost or budget estimates for the proposed structural works.
  • Detailed drawings or annotated photographs showing repair locations, beam sizes, reinforcement details, and foundation depths.

These reports normally take up to two weeks, depending on the project complexity and whether any intrusive testing is required. However, at Western Building Consultants, we’ve been able to complete many project reports in as little as 10 working days. 

Enlist the Help of Our Structural Engineering Experts

If you need the help of a trusted structural engineer for your commercial or residential project, you’re in safe hands with Western Building Consultants

Our structural engineering experts include members of the Chartered Association of Building Engineers (CABE), the Institution of Civil Engineers (ICE), and CIAT. Whether you’re building a loft conversion or extending commercial premises, we’re here to ensure your project runs smoothly at every stage. Get in touch with our friendly team today to discuss your project requirements.

 

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