The two titles cause genuine confusion, and getting them mixed up can cost you time and money. If you instruct the wrong professional, you may receive a useful report but still not have the document your local authority or mortgage lender actually needs.
In short: a structural engineer designs structural elements and produces the signed calculations required by Building Control. A building surveyor with structural experience — sometimes called a structural surveyor — inspects buildings, diagnoses defects, and advises on remediation, but typically cannot produce the engineered calculations that sign off structural work.
What a Structural Engineer Does
A chartered structural engineer holds CEng status and is usually a member of the Institution of Structural Engineers (MIStructE or FIStructE) or the Institution of Civil Engineers (MICE). Their core work is:
- Designing beams, columns, lintels, and foundations
- Producing structural calculations demonstrating compliance with Eurocodes (EC0, EC1, EC3, EC5, EC7 etc.)
- Issuing structural drawings and specifications for a contractor to build from
- Signing off structural elements for Building Regulations approval
- Reviewing and approving RSJ/steel beam sizes for wall removals
- Providing structural surveys after subsidence, flood damage, or suspected defects
When you knock down an internal wall, insert a steel, extend, or convert a loft, you will almost certainly need a structural engineer to produce calculations. Building Control will not accept an inspection report in place of structural calculations for these works.
What a Building Surveyor Does (and What “Structural Surveyor” Actually Means)
The title “structural surveyor” is not a protected or regulated designation in the UK — anyone can use it. What it usually refers to is a chartered building surveyor (MRICS, surveying pathway) who specialises in structural defects, or a chartered building engineer (MCABE).
Their core work is:
- Level 2 and Level 3 RICS home surveys (formerly HomeBuyer Report and Building Survey)
- Defect diagnosis: damp, cracking, subsidence, decay, failed roofing
- Preparing schedules of condition and schedules of dilapidations
- Expert witness reports for property disputes
- Party wall awards
A building surveyor is the right person when you want to understand the condition of a structure and what remediation is needed. They are not the right person when you want to design a structural change.
[!note] Overlap Does Exist Some chartered building surveyors have additional structural engineering qualifications and can perform both roles. Always ask specifically whether they can produce structural calculations that will satisfy Building Control before instructing them.
When You Need Which Professional
| Situation | Who to instruct |
|---|---|
| Pre-purchase survey on a property | RICS-chartered building surveyor (Level 2 or 3) |
| Removing an internal wall / inserting a steel | Structural engineer (for calculations + drawings) |
| Cracking in walls — cause unknown | Either; building surveyor often leads, structural engineer if underpinning is needed |
| Loft conversion structural design | Structural engineer |
| House extension foundation design | Structural engineer |
| Flat roof replacement (standard) | Building surveyor or specialist roofing contractor |
| Party wall dispute | RICS party wall surveyor (specialist sub-discipline) |
| Subsidence / heave claim | Building surveyor initially; structural engineer if underpinning required |
| Structural warranty inspection (new build) | Structural engineer or NHBC-approved inspector |
| Damp diagnosis | Building surveyor or independent damp specialist |
Qualifications to Check
When instructing either professional, verify membership of the relevant body:
Structural engineer:
- MIStructE / FIStructE (Institution of Structural Engineers) — gold standard for structural work
- MICE / FICE (Institution of Civil Engineers) with structural specialism
- CEng status confirms chartered engineer grade
Building surveyor:
- MRICS / FRICS (Royal Institution of Chartered Surveyors) — survey and valuation pathway
- MCABE (Chartered Association of Building Engineers)
- CIOB membership (Chartered Institute of Building) — more common in project management roles
Both types of professional require professional indemnity (PI) insurance. Ask for evidence of cover before signing an appointment letter, especially for structural engineer work where liability follows the calculations.
Typical Costs in 2026
Structural engineer fees:
| Service | Typical fee range |
|---|---|
| Single steel beam calculation (wall removal) | £350–£700 |
| Loft conversion structural package | £800–£1,800 |
| Extension structural design (small) | £900–£2,000 |
| Structural survey / condition report | £400–£1,000 |
| Underpinning design | £1,500–£5,000+ |
Building surveyor fees:
| Service | Typical fee range |
|---|---|
| RICS Level 2 Survey | £400–£700 (depends on property size) |
| RICS Level 3 Survey | £600–£1,200 |
| Structural defect report | £300–£700 |
| Party wall award (surveyor-only) | £700–£1,500 |
| Schedule of dilapidations | £500–£2,000 |
Day rates in 2026: structural engineers typically charge £550–£950 per day for site attendance; RICS surveyors typically charge £400–£750 per day.
The Party Wall Act: Who Handles It?
The Party Wall etc. Act 1996 creates a specific role for a party wall surveyor — this is not a separate professional credential but a service role that can be carried out by either a structural engineer or a building surveyor (and sometimes by other professionals). Most party wall matters are handled by RICS-registered surveyors who specialise in this area.
If your loft conversion or extension triggers the Party Wall Act (works within 3–6 metres of a neighbour’s structure, or directly astride the boundary), you’ll need both: a structural engineer for the design calculations and a party wall surveyor to serve notices and prepare the award.
Red Flags When Instructing
- No PI insurance: non-negotiable for structural work
- Calculating verbally: structural calculations must be written, signed, and submitted. Anyone who says they’ll “tell you what size beam to use” without producing calculations is not providing a Building Regulations-valid service.
- Generic reports: a structural report on your specific property should reference your specific property — address, date of inspection, photographs, specific defects seen
- Unregistered persons: check IStructE and RICS registers online before instructing
Building Regulations and Sign-Off
For most structural alterations in England and Wales (wall removals, new openings, extensions, loft conversions), you need:
- A Building Regulations application (Full Plans or Building Notice)
- Structural calculations from a chartered structural engineer submitted to Building Control
- Inspection by the BCO at key stages (foundations, steelwork, completion)
- A Completion Certificate issued by the local authority or approved inspector
A building surveyor’s condition report does not substitute for any of the above. If a contractor tells you a structural survey from a surveyor is sufficient to satisfy Building Control for load-bearing work, that is incorrect.
