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What is a structural engineer and why do you need one?

2 min read
Oct '25 • by Heather

Quick summary

A structural engineer is essential for big home projects involving building regulations, such as extensions or removing load-bearing walls, and costs between £950 and £2500 including VAT for typical projects like extensions. They provide calculations, plans, and advice to ensure your home’s safety and durability, usually working alongside your architect and contractor.

Architect. Surveyor. Structural engineers.

When it comes to big home projects, you often find yourself confronted with a list of professionals that leaves you scratching your head. One of the biggest offenders is the structural engineer. Just what exactly do they do, and why do you need one?

Let’s find out…

What is an structural engineer?

Ever wonder why more building don’t just fall down? That’s because structural engineers exist. These professionals specialise in the structure of buildings, determining a project’s strength, durability, and safety - thanks to some very clever calculations.

They’ll tell you what steel beams need to be in place, where to put them, whether or not your structural glass has the strength for your home, and advise on the foundations of your project.

Because structure is so important to so many areas of your home, a structural engineer will often work alongside your architect and contractor, to make sure your home is as safe as it can possibly be.

When do I need a structural engineer?

You’ll likely need a structural engineer if you’re…

  • Building an extension
  • Converting a loft
  • Removing a chimney breast
  • Removing / modifying internal walls, especially load bearing walls
  • Fitting solar panels
  • Underpinning floors
  • Modifying / adding doors and windows

Basically, anything that involves building regulations, you’ll want a structural engineer involved.

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