Buying a home is the largest purchase most people ever make, yet plenty of buyers still rely on a mortgage valuation — a document produced for the lender, not for them — as their only check on the property’s condition. A proper survey is how you find out what you are actually buying.
RICS defines three levels of home survey under its Home Survey Standard. This guide explains what each level covers, what it does not, and how to choose between them.
The three levels at a glance
| Level 1 | Level 2 | Level 3 | |
|---|---|---|---|
| Depth | Basic condition snapshot | Intermediate | Comprehensive |
| Traffic light ratings | Yes | Yes | Yes |
| Defect diagnosis | No | Limited | Detailed, with repair options |
| Maintenance advice | No | Yes | Yes, detailed |
| Best for | Modern, conventional homes in good condition | Standard homes in reasonable condition | Older, larger, altered or problematic properties |
Level 1: the Condition Report
The Level 1 survey is a concise, objective snapshot. Each element of the property — roof, walls, floors, services and so on — receives a traffic light rating: green (no repair currently needed), amber (defects needing attention but not serious or urgent), or red (serious defects needing urgent repair or investigation).
What it deliberately does not do is diagnose defects or advise on repairs. It tells you that something needs attention, not why or what to do about it.
Level 1 suits modern, conventionally built properties that appear to be in reasonable condition, where you want reassurance rather than analysis.
Level 2: the most popular choice
The Level 2 survey covers the same ground as Level 1 but goes meaningfully further. Alongside the condition ratings you get:
- a description of visible defects and their significance
- advice on repairs and ongoing maintenance
- matters your conveyancer should investigate before exchange
- identification of risks to the building and its occupants
For a conventional house or flat built after around 1900 and in apparently reasonable condition, Level 2 is usually the right balance of depth and cost — which is why it is the most commonly commissioned survey in the UK.
One point worth checking when comparing surveyors: Level 2 comes in two variants, survey only and survey with valuation. Some practices, including this one, offer the survey-only format — if you need a market valuation, that is a separate exercise (and your lender will commission its own valuation regardless).
Level 3: the Building Survey
The Level 3 Building Survey — historically called a “full structural survey”, a term RICS no longer uses — is the most thorough option. The inspection is longer and more detailed, and the report explains:
- how the property is constructed
- what defects exist, why they have occurred, and how they may develop
- options for repair, and the consequences of not acting
- serious risks and dangerous conditions
- detailed matters for your legal advisers
Level 3 is the right choice for:
- pre-1900 and period properties
- larger houses, or homes that have been extended or altered
- non-standard construction
- any property where problems are already visible or suspected
- purchases where you plan significant renovation
How to decide
Ask three questions about the property:
- How old is it? Pre-1900 construction behaves differently — solid walls need to breathe, lime mortar moves, and defects interconnect. Older buildings almost always justify Level 3.
- Has it been altered? Extensions, loft conversions, removed chimney breasts and knocked-through walls all introduce risk that a basic survey will not unpick.
- Is anything already worrying you? Cracking, damp smells, a roof that looks tired in the listing photos — if you already have a concern, buy the survey level that can actually investigate it.
If the answers are “modern, unaltered, nothing visible”, Level 1 or 2 will serve you well. Anything else points to Level 3.
What no survey level includes
All three home survey levels are visual, non-invasive inspections of the accessible parts of the property. No survey level includes lifting fitted carpets, opening up walls, or testing gas and electrical installations — though a good report will recommend specialist tests where the visible evidence justifies them.
A survey is also not a guarantee. It is a professional assessment of condition at a point in time, based on what could be seen. That is precisely why the surveyor’s experience matters: the more building pathology someone has seen, the more the visible evidence tells them.
The cost question
Survey fees scale with the level and the property, but they are small against the numbers involved in a purchase. A Level 3 survey on a period house typically costs a fraction of one per cent of the purchase price — and routinely surfaces issues worth many times its fee in negotiation, or in avoided mistakes.
The expensive survey is the one that was a level too shallow for the building.