Structural Engineer Fee Calculator 2025/26

You need a structural engineer when any work affects the structural integrity of a building: removing a load-bearing wall, installing a steel beam, adding a loft conversion, building an extension with a new foundation, underpinning an existing foundation, or carrying out any work on a listed building. Building control will typically require structural calculations from a chartered engineer as part of the building regulations application. Always use an IStructE or ICE chartered engineer for structural work.

Architects design the form, function and aesthetics of buildings — the spaces, materials and overall design. Structural engineers design the bones of the building — the foundations, beams, columns and structural frame that keep it standing safely. On most projects you need both: the architect provides the design intent and planning drawings; the structural engineer ensures the design is safe and buildable. On simple residential projects (loft conversions, extensions) a structural engineer alone may suffice without an architect.

Look for Chartered Membership of the Institution of Structural Engineers (MIStructE or FIStructE) or the Institution of Civil Engineers (MICE or FICE). These qualifications demonstrate the engineer has met rigorous professional standards. The engineer should carry professional indemnity insurance. For building regulations submissions, building control will accept calculations signed by a chartered structural engineer. Always check the engineer is registered on the Engineering Council UK Register (EngC).