Extensions and conversions can add useful space while making a building more complex. Junctions between old and new work, altered load paths, roof details, drainage and ventilation may all deserve careful consideration, even where the finishes appear recent.
A survey assesses visible condition; it does not grant retrospective approval or prove concealed work complies. Planning permission, building regulations, party-wall procedures and ownership rights are distinct matters requiring documentary and legal checks.
Why complexity influences the level
RICS describes Level 2 as best suited to relatively conventional, straightforward homes. Multiple extensions, loft conversions, basement work or removed walls can make Level 3 more proportionate because it provides deeper construction and defect analysis.
The choice still depends on the property’s condition, scale and design. Send plans or particulars where available and explain any work you intend to undertake.
What can be inspected
The surveyor considers visible junctions, cracking, moisture, roof arrangements, support and finishes, relating them to the apparent construction. Accessible roof spaces and relevant external areas can provide additional evidence.
Foundations, beams, cavity details and hidden drainage are not normally exposed. Fresh decoration may conceal evidence, and the surveyor cannot certify workmanship without adequate visibility and records.
Approvals and legal questions
GOV.UK explains that building regulations approval is different from planning permission and that some projects need both. Party-wall duties are separate again. Ask the conveyancer to obtain decisions, completion documents, guarantees and consents relevant to the changes.
A certificate does not mean a current condition survey is unnecessary, while a survey does not validate missing documentation. Apparent inconsistencies between the building and records require follow-up.
- Planning permission or lawful-development evidence.
- Building-control approval and completion records.
- Party-wall documents where applicable.
- Freeholder or lease alteration consent.
- Design, guarantee and contractor information.
Before committing
Where the survey identifies movement, poor detailing or uncertainty about support, ask what further investigation is needed. A structural engineer, drainage specialist or targeted opening-up may be appropriate, subject to permission.
In England and Wales, complete material survey and legal enquiries before exchange where possible. Your conveyancer should advise on the legal consequences of missing approvals or rights.
Advice for your property
Get the right professional inspection
Online guidance is useful, but it cannot account for the construction, condition and history of an individual property. Tell us what you are buying or need valued and we will explain the appropriate service.
Authoritative sources and further reading
The guide is general information, not property-specific, structural, legal, tax or financial advice. Source pages can change; consult the relevant professional for your circumstances.