A mortgage valuation is carried out for the lender, not for you as the buyer. It does not provide a detailed assessment of the property's condition.
A RICS Level 2 or Level 3 survey identifies defects, risks and maintenance issues that may not be visible during a viewing.
Level 2 Building Survey
Suitable for conventional properties in reasonable condition.
Level 3 Building Survey
Recommended for older, altered or non-standard properties or where major works are planned.