What Is a Structural Engineer and When Do You Need One?

A structural engineer assesses and designs load-bearing elements and structural changes. On domestic building projects, their work can include calculations, drawings or details for foundations, beams, columns, roof alterations, retaining structures or other elements where structural design is required.

Professional title and competence should be checked for the actual appointment. Chartered structural engineers may hold professional membership through bodies such as the Institution of Structural Engineers (IStructE) or Institution of Civil Engineers (ICE), but this page does not state that every domestic project legally requires a chartered engineer or that TCM employs one.

Architectural design and structural design are different responsibilities and may be performed by different competent professionals depending on the project. The project documents should identify who owns each design task, what information they require, and what deliverables are needed for construction and the applicable building-control route.

Structural calculations and drawings should match the specific change being designed. Depending on the project, the scope can include foundations, beams or columns, roof or floor alterations, retaining structures, bearings, connections and how new work interacts with the existing building.

The designer needs reliable project information such as drawings, dimensions, existing construction, proposed openings, loads and relevant site or ground information. Generic beam sizes, foundation depths or timber dimensions from another property should not be copied onto the project.

Structural design is not the same as Building Regulations approval. The responsible structural professional prepares the structural information within their appointment; the relevant building-control body assesses the work through the applicable approval and inspection process.

Define the required service before appointing a structural professional. Useful questions include whether the appointment covers an initial assessment, calculations, drawings, site visits, responses to design changes or building-control queries, and any review of construction-stage information.

The current TCM evidence registers do not approve a standard Hertfordshire structural-engineering fee. Obtain current quotations for the actual scope and check what is included, excluded and charged separately. Professional membership, insurance and relevant experience should be verified for the person or practice being considered rather than inferred from a recommendation.

TCM can coordinate project information where this forms part of the agreed building scope, but the current register does not approve a universal TCM structural-engineer appointment service or named professional network. The client and project documents should identify who appoints the structural professional and who owns design communication.

Architectural and structural responsibilities overlap at project interfaces but are not interchangeable. Architectural design typically addresses layout, appearance, spatial coordination and construction information within the designer's appointment, while structural design addresses the stability and load-bearing elements within the structural professional's appointment.

Who prepares planning drawings, detailed construction information, structural calculations or building-control submissions depends on the procurement route and written appointments. Do not assume an architect, architectural technologist, structural engineer or contractor automatically owns a task merely from their job title.

On structurally complex projects, early coordination between the building designer and structural professional can help identify constraints before details are fixed. TCM may coordinate information between appointed parties where agreed, but this page does not claim an in-house architect or structural engineer, or a standing local professional network.

If work changes structural elements, the project still needs an adequate structural design and a competent route for establishing how loads and stability are managed. Proceeding without required design information can create safety, compliance, programme and remedial-work risks.

Do not use visible cracking, span length or an online beam example to decide that structural work is safe. Load-bearing alterations, temporary stability and structural supports should follow the project-specific design and construction information produced by the appropriate professional.

A structural professional's appointment does not guarantee that a building is safe in every respect or that Building Regulations approval will be issued. Their deliverables are one part of the wider design, construction, inspection and approval process.

TCM can undertake building work that includes structural alterations and can coordinate information with appointed designers or structural professionals where this forms part of the agreed project scope.

The current Experience Inputs Register contains no approved TCM structural-engineering case, named engineer network, fee history or project outcome for publication. This page therefore does not claim that TCM appoints a structural engineer on every project, employs an in-house structural engineer, or has a standing network of chartered engineers.

Before structural work starts, the project should identify the responsible designer, the latest structural information, any temporary-works requirements, the building-control route, and how design changes will be authorised and communicated to the contractor.

If you are planning structural work, read the Building Regulations Guide or use the contact-status page to check which TCM enquiry route is currently verified for the building-work scope.