RICS Home Survey Level 3 (detailed survey)
RICS Home Survey Level 3
The most detailed RICS home survey: when Level 3 is the right choice, what it diagnoses, and the clear line between a Level 3 and a structural engineer's report.
Last reviewed 31 August 2026
When do I need a RICS Home Survey Level 3?
Level 3 is the most detailed service in the RICS Home Survey Standard. It is intended for older, larger, altered, unusual or visibly run-down properties, and where major work is planned. The surveyor describes the construction, sets out the likely cause and consequence of defects so far as a visual inspection allows, and prioritises the work. It is not a structural engineer's report.
At a glance
- Report style
- Construction described element by element, defects diagnosed and prioritised.
- Intended for
- Older, larger, altered, unusual or run-down buildings, or planned major works.
- Not included
- Structural calculations or engineering design.
- Valuation
- Only where a valuation is separately commissioned.
Diagnosis, not just rating
The defining feature of Level 3 is reasoning about cause. A crack is not simply recorded; the report considers what is likely to have caused it, whether the movement appears historic or progressive, and what evidence would settle the question.
That matters most in buildings where several things interact: a Victorian terrace with a replaced roof covering, a rear extension on shallow foundations, and a chemically injected damp-proof course all in the same property.
Properties where Level 3 usually earns its fee
Age alone is not the test, but it is a strong signal. So is alteration. A building that has been converted, extended, underpinned, re-roofed or opened up internally carries risks that a concise report cannot responsibly compress.
- Pre-1919 solid-wall construction and period detailing
- Properties converted into flats or houses in multiple occupation
- Buildings with visible movement, spreading roofs or bulging walls
- Timber-framed, steel-framed, concrete or other non-traditional construction
- Any property where you intend significant work after purchase
Where a Level 3 stops
A Level 3 report is a surveyor's report. Where the property needs structural calculations, remedial design or specialist testing, the report identifies that need and refers you on. Describing a Level 3 as a structural engineer's report is simply wrong, however detailed it is.
Equally, a Level 3 does not open up the building. Concealed timbers, buried drainage and hidden fixings remain unexamined unless a separate investigation is arranged.
Who this is for
A good fit if
- Buyers of period, converted, extended or non-traditionally built property
- Owners planning a major refurbishment or reconfiguration
- Anyone whose earlier report recommended further investigation
Not the right choice if
- Straightforward modern homes in apparently reasonable condition
- Buyers who need only a valuation figure
- Situations already requiring an engineer's calculations rather than an inspection
Making Level 3 useful
A detailed report is only as good as the brief you give the surveyor.
1.Share what you know about the building's history
Extensions, underpinning, re-roofing, conversions and previous remedial work all shape where the surveyor looks hardest.
2.Say what you plan to do after purchase
Removing walls, converting a loft or digging out a cellar changes which findings matter most to you.
3.Budget for the referrals the report recommends
Drainage, timber, asbestos or structural investigations often follow a Level 3 — plan the time and cost, not just the survey fee.
Common defect investigations
When to bring in a specialist
- Progressive movement, subsidence or the need for remedial design: a structural engineer.
- Suspected asbestos-containing materials in a pre-2000 building: a competent asbestos surveyor.
- Cladding or external wall build-up on flats: specialist fire and building-safety advice. An EWS1 form is not a general building-safety certificate.
- Trees close to the building on shrinkable clay: an arboriculturist alongside the engineer.
Common questions
Limitations and sources
- A Level 3 is not a structural engineer's report and contains no structural calculations or engineering design.
- Any survey is limited to what the surveyor can see and safely reach on the day. Areas behind finishes, under floors or beneath stored belongings are not opened up.
- Nothing on this page is a professional opinion about a specific property. KJ Surveyors has not inspected your building, and general guidance cannot replace an inspection and report.
Last reviewed 31 August 2026.
Where to go next
- the survey levels hub — where Level 3 sits against the other two.
- building survey — the same service under the name most buyers search for.
- structural reporting — what a surveyor can and cannot say about structure.
Ask KJ whether the property warrants Level 3
Describe the age, construction, any alterations and what you noticed at the viewing. KJ will explain where the risk sits and what to instruct alongside.
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KJ gives general guidance only and has not inspected your property. A professional opinion follows an inspection by a surveyor.