Structural Engineer FAQs

A structural engineer assesses how a building is supported and designs structural elements to help keep it safe and stable. They can help with projects such as removing load-bearing walls, installing steel beams, building extensions and converting lofts.

Structural engineers also inspect concerns such as cracking, movement or roof deformation and advise whether further investigation or remedial work may be needed.

At StructSpectrum, we help homeowners, buyers and builders find the right structural engineering support for their projects.

You may need a structural engineer if you are planning work that could affect the strength or stability of your property, or if you have concerns about its structural condition.

Common reasons to contact a structural engineer include removing a wall, forming a new opening, removing a chimney breast, converting a loft or investigating significant cracks.

If you are unsure whether your project needs structural input, tell us what you are planning and we can advise on the appropriate next step.

The cost of a structural engineer depends on the type of work, the property, its location and the complexity of the project. A structural inspection and report will usually be priced differently from structural calculations for a wall removal or extension.

When comparing quotations, check what is included, such as the site visit, report, calculations and drawings. StructSpectrum provides project-specific quotations so you know what service is included before proceeding.

Get a free structural engineering quote.

When looking for a structural engineer near you, check that they have experience with your type of property and project, appropriate qualifications and professional indemnity insurance. You should also ask what is included in their quotation and whether a site visit is required.

StructSpectrum coordinates structural engineering services through a network of independent engineers across the UK. We can help with structural reports, inspections, calculations and drawings, subject to availability in your area.

An architect generally focuses on the design, layout and appearance of a building or alteration. A structural engineer focuses on how the building is supported and designs structural elements such as beams, posts, foundations and floor structures.

For example, an architect may prepare the layout for an extension, while a structural engineer designs the beams needed for a new opening. Depending on the project, you may need both professionals.

A structural engineer can assess whether cracks may be related to structural movement and advise whether further investigation, monitoring or remedial work is needed. A builder can then provide a quotation for any recommended repair work.

If you are unsure what is causing the cracks, an independent structural assessment can help you understand the issue before deciding what repairs to carry out.

A wall may be load-bearing if it supports floor joists, roof timbers, another wall or other parts of the building above it. Its position, thickness and the direction of the joists can provide clues, but these signs alone do not always confirm whether the wall is structural.

A structural engineer can assess the wall and the surrounding structure. In some cases, small openings may be needed to see concealed joists or other structural elements.

Read more: How to Tell If a Wall Is Load-Bearing.

If a wall is load-bearing, a structural engineer can assess the loads it carries and design suitable replacement support before it is removed. This may involve a steel beam, posts, padstones or other structural elements.

If you are unsure whether the wall is load-bearing, an assessment can help establish what is needed. You should not rely on appearance alone or remove a wall before its structural role has been checked.

The cost depends on whether you need a wall assessment, structural calculations, drawings or a combination of these services. The number of walls, the size of the opening, the type of support required and your location can also affect the price.

At StructSpectrum, we provide a quotation based on your proposed work. Let us know which walls you want to alter and, if available, send us a floor plan or photographs.

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In England and Wales, removing a load-bearing wall will generally require Building Regulations approval because the work affects the structure of the building. Building Control may ask for structural calculations and details of the proposed support.

Planning permission and Building Regulations approval are separate matters. Requirements can vary depending on the property and location, so check with the relevant Building Control body before work starts.

If the wall is load-bearing, removing it will generally require Building Regulations approval because the work affects the structure of the property. Building Control may ask for structural calculations and details of the proposed beam or other support.

If the wall is a non-load-bearing partition, approval may not be needed for its removal alone. However, other changes made as part of the work could still need approval. If you are unsure whether a wall is load-bearing, have it assessed before removing it.

If you want to remove or alter a load-bearing wall, the structural engineer can assess the loads it supports and design suitable replacement support. This may include a steel beam, padstones, posts or other elements, depending on the property and proposed opening.

Once the structural calculations and details have been prepared, your builder can use them to plan the work. Building Regulations approval will generally be needed, so contact Building Control before the structural work begins.

The size of a steel beam cannot be determined safely from the width of the opening alone. It depends on the loads above, the span, the type of property and how the beam will be supported.

A structural engineer can calculate the required beam and specify associated details, such as bearings, padstones or posts where needed. Your builder can then use the structural design to carry out the work.

Yes. A structural engineer may be able to provide a confirmation letter following an assessment of the wall and the relevant parts of the structure.

In some cases, the engineer may need to see concealed elements, such as floor joists above the wall, before reaching a conclusion. This could require a small opening in the ceiling or floor, arranged by the property owner or builder. The need for opening up depends on the property and what can be established during the inspection.

You may need a structural engineer when removing a chimney breast, particularly if the chimney structure remains above or the breast provides support to other parts of the building.

An engineer can assess the proposed removal and advise on the support required. Building Regulations approval may also be needed, and work involving a shared wall can raise Party Wall matters.

You may need a structural engineer if installing bifold doors involves widening an existing opening or creating a new opening in an external wall. The structure above the opening may need support from a lintel, steel beam or frame.

The engineer can assess the loads and prepare the structural calculations and details needed for the proposed opening. The requirements depend on the size of the opening and the existing construction.

A structural engineer’s report is a written assessment of a property’s structure or a specific structural concern. It may be requested because of cracks, movement, roof deformation, a previously removed wall or a concern identified during a property survey.

The report usually describes the engineer’s observations and may include an opinion on possible causes, recommendations for repairs or advice on further investigation. The precise content depends on the agreed scope and what the engineer can inspect.

The cost depends on whether you need a report on one specific concern or a broader visual inspection of the property. The size, location and complexity of the property, as well as the number of issues to be assessed, can affect the price.

For example, a report on cracking in one area may have a different scope from a full-house visual structural report. StructSpectrum can provide a quotation once we understand what you need and any requirements from your lender, insurer or surveyor.

The cost depends on the number and location of the cracks, the size of the property and whether you need a written structural report. An inspection of one specific area may have a different scope and cost from a visual inspection of the whole property.

If you are requesting a report for a mortgage lender, insurer or property purchase, let us know exactly what they have asked for. This will help us provide a quotation for the appropriate scope of inspection.

A structural engineer looks at the structural elements and concerns covered by the agreed inspection scope. Depending on the reason for the visit, this may include walls, floors, roofs, visible beams, cracking, movement or signs of structural alterations.

Most initial residential inspections are visual and non-intrusive. If important structural elements are concealed, the engineer may recommend opening up or further investigation before reaching a conclusion.

The time needed depends on the complexity of the inspection, the information available and the engineer’s workload. At StructSpectrum, we typically aim to issue reports within 5–7 working days after the site visit, although this can vary.

If your report is needed for a property purchase, mortgage application or another deadline, let us know when you enquire so we can discuss availability and the expected timescale.

Not all cracks indicate a serious structural problem, but some may need professional assessment. The size, direction, location and development of a crack can all be relevant.

You may wish to seek advice if cracks are widening, appearing around doors or windows, or accompanied by movement, uneven floors or doors that no longer close properly. A structural engineer can inspect the affected area and advise whether further investigation is needed.

Some fine cracks can result from normal shrinkage or movement, while others may be associated with a more significant issue. Signs worth investigating include cracks that are growing, stepped cracks in brickwork, wider cracks or several cracks appearing alongside other signs of movement.

It is not always possible to determine the cause or seriousness of a crack from its appearance alone. An inspection can help identify possible causes and whether monitoring, further investigation or repairs are recommended.

Yes. A structural engineer can inspect visible signs that may be associated with subsidence or other forms of movement, such as cracking, distortion or uneven floors.

A visual inspection may not establish the cause on its own. Depending on the findings, the engineer may recommend monitoring cracks, investigating drains, checking ground conditions or carrying out further specialist investigations.

You may need a structural engineer before buying a house if your surveyor identifies a potential structural concern or if you notice issues such as significant cracks, movement or previous structural alterations.

A structural engineer’s inspection focuses on the structural concerns within the agreed scope. It is different from a general homebuyer or building survey, which normally considers a wider range of property conditions.

If you are buying a property, it is helpful to share the relevant section of your survey report when requesting a quote.

A mortgage lender may ask for a structural engineer’s report if its valuer or your surveyor identifies a concern that needs further assessment. This could involve cracking, movement, roof issues or evidence of previous structural alterations.

The lender’s wording matters: it may specify what must be inspected and the qualifications or insurance the engineer should hold. Send us the lender’s request so we can check the scope and arrange an appropriately qualified engineer where available.

Not necessarily. A Level 3 building survey provides a broad assessment of a property, while a structural engineer’s report focuses on the structural condition or specific concerns covered by the agreed scope.

If your lender has specifically requested a report from a structural engineer, check its exact requirements before arranging an inspection. The lender may specify the areas to be assessed, the type of report or the qualifications the engineer must hold.

Send us a copy of the lender’s request and any relevant survey findings so we can check what service may be appropriate.

A lender may reject a structural engineer’s report if it does not meet the scope or requirements set out in the lender’s request. For example, the lender may have asked for a broader assessment of the property, while the report only addresses one specific area.

The lender may also require further information or specify particular qualifications or insurance for the engineer. The reason will depend on the lender’s instructions and the report provided.

If your report has been rejected, ask the lender for its requirements in writing. StructSpectrum can review the request and advise whether we can arrange an inspection or report to address the requested scope.

You can consider buying a property where a load-bearing wall has been removed without the relevant documentation, but it is important to understand both the structural condition and the paperwork before proceeding.

A structural engineer may be able to assess the alteration and advise whether further investigation is needed. Your solicitor can advise you on the missing Building Control documentation and the options available.

If the support is concealed, it may need to be exposed before its adequacy can be assessed. Any opening up before purchase will require the property owner’s permission.

Most extensions require some structural engineering input. An engineer may need to design elements such as beams over new openings, roof structures, floor structures or foundations, depending on the project.

The structural engineer normally works alongside your architect or designer. Structural calculations and drawings may be needed as part of the Building Regulations process and to help the builder carry out the structural work.

A loft conversion will usually require structural engineering input because the existing roof and ceiling structure may need to support new loads or be altered to create usable space.

A structural engineer can assess and design elements such as new floor joists, steel beams, roof supports and dormer structures where required. The exact design depends on the existing property and the proposed conversion.

Structural calculations demonstrate how structural elements have been designed to support the loads placed on them. They may cover steel beams, lintels, posts, floor joists, roof members and foundations.

You may need structural calculations when removing a load-bearing wall, forming an opening, building an extension or converting a loft. Building Control may request the calculations as part of the Building Regulations process, and your builder can use the accompanying details when carrying out the work.

Building Control checks whether building work complies with the relevant Building Regulations, which cover matters such as structural safety, fire safety, insulation and ventilation.

If you are planning structural work, such as removing a load-bearing wall or building an extension, Building Regulations approval will generally be required. Depending on the project and location, you may be able to use your local authority or a registered building control approver.

Planning permission generally deals with whether a proposed development is acceptable in terms of matters such as its appearance, size, use and impact on the surrounding area.

Building Regulations approval deals with how the work is designed and carried out, including structural safety and other technical requirements. Some projects need both approvals, while others may need only one. Not needing planning permission does not automatically mean Building Regulations approval is unnecessary.

In England and Wales, it may be possible to apply to the local authority for a regularisation certificate for certain unauthorised work carried out after 11 November 1985. The council will explain what information and inspections are needed for your particular case.

You may be asked to expose parts of the work so they can be inspected. Structural calculations, drawings or remedial work may also be required. A structural engineer can assess the relevant structural elements, but a report alone does not guarantee that the work will be approved.

If a wall was removed without the required approval, the local authority may need information about the work before deciding whether it can issue a regularisation certificate. This can become relevant when you are selling, buying or remortgaging a property.

A structural engineer may be able to assess the alteration and advise on the structural support. If the beam or its bearings are concealed, they may need to be exposed so the engineer can inspect them. Depending on what is found, calculations, further investigation or remedial work may be needed.

First, check whether the work required Building Regulations approval and whether any records are available from the previous owner, builder or local authority.

If approval was required but not obtained, you may be able to discuss a regularisation application with your local authority. A structural engineer can assess the structural alteration and advise what information or investigations may be needed.

The council may require parts of the work to be exposed, and further calculations or remedial work may be necessary. If you are buying or selling, your solicitor can advise you on the documentation and options for the transaction.

Yes. A structural engineer can inspect completed alterations, such as a removed wall or installed beam, and advise on the visible structure within the agreed scope.

However, a visual inspection alone may not confirm whether concealed structural elements are adequate. The engineer may need the beam, bearings or surrounding structure to be exposed, and further calculations or investigations may be required. An inspection does not automatically mean the work can be approved if it is found to be inadequate.

Yes. A structural engineer can assess an existing steel beam, but the extent of the assessment depends on what information is available and whether the beam and its supports can be inspected.

The engineer may need details such as the beam size, span, loads above and how it is supported at each end. If these details are concealed, opening up and structural calculations may be required to assess whether the beam is adequate.

A visual inspection alone does not necessarily confirm that a concealed beam is the correct size or has been installed correctly.

In many cases, yes. If a steel beam is covered by plasterboard, plaster or other finishes, the engineer may need it to be exposed to identify its size, condition and support arrangements.

The beam’s bearings and the surrounding structure may also need to be visible. The engineer can then advise whether enough information is available to carry out an adequacy check or whether further opening up or calculations are required.