What a Surveyor Actually Checks During a Property Inspection

Quick explanation

A surveyor inspects the parts of the property that can be seen and accessed.
They check the roof, walls, floors, windows, insulation, damp risks, ventilation, and visible services.
They also consider location risks and signs of movement.
They then explain what matters and what you should do next.

First, the surveyor checks access and safety

A good inspection starts with simple questions.
Can the surveyor access the loft hatch?
Are there keys for garages and outbuildings?
Is there safe access to inspect the services?

If access is blocked, the surveyor will say so in the report.
That matters because missed areas can hide expensive problems.
Would you rather find that out before or after you complete?

External checks: what the surveyor looks at first

The outside often tells you the most.
It shows how water moves, how the building “breathes”, and whether repairs have been done well.

• Roof coverings and roofline

  Missing or slipped tiles, damaged slates, patch repairs, sagging ridgelines, and signs of age.
  The surveyor will also look at chimney stacks, flashing, and mortar where visible.

• Gutters, downpipes, and drainage

  Blocked gutters, poor falls, leaks, staining on walls, and broken joints.
  Water management issues often lead to damp, rot, and internal damage.

• Walls and pointing

  Cracks, bulges, blown render, spalled brickwork, and failing mortar.
  The surveyor looks at crack patterns, not just the crack itself.

• Damp risk clues at ground level

  High ground levels, blocked air bricks, bridged DPCs, and external coatings that trap moisture.
  These details can explain internal damp readings later.

If you have seen posts about air bricks, you will know how easy it is for small changes to cause bigger damp issues.
If you want a deeper read, start with
air brick placement and damp risk.

Signs of movement: what gets flagged and why

People worry about subsidence for a reason.
It can affect mortgage decisions, insurance, and resale.
A surveyor will not guess.
They will look for consistent evidence.

• Cracks and their pattern

  Step cracking in brickwork, diagonal cracking around openings, fresh versus historic repairs, and any signs the crack is active.

• Distortion

  Sloping floors, racked door frames, sticking doors, and bowed walls.
  One issue alone rarely proves movement.
  Several together can.

• External contributors

  Large trees close to the property, drainage problems, and ground conditions suggested by the local area.

If this is your main concern, read
subsidence signs every homebuyer should know
before you view your next property.

Internal checks: room-by-room, but not “just the pretty bits”

Inside, the surveyor checks the building fabric and how it performs.
They look for moisture, poor ventilation, unsafe alterations, and wear that hints at bigger defects.

• Walls, ceilings, and finishes

  Staining, cracking, blown plaster, and patch repairs.
  The surveyor considers what is cosmetic and what may signal leaks or movement.

• Floors and skirtings

  Springiness, unevenness, and signs of rot where visible.
  Timber issues often link back to ventilation and moisture.

• Windows and doors

  Operation, sealing, visible decay, and condensation patterns.
  The surveyor will also note any safety glazing concerns where relevant.

• Bathrooms and kitchens

  Extractor fans, signs of leaks under sinks (where accessible), and staining around fixtures.
  These rooms are high moisture zones, so small issues add up fast.

Do you know what your surveyor will photograph, and why?
This helps you understand the report later.
If you want that explained, see
why surveyors take photos during a home survey.

Loft checks: the area buyers forget to ask about

The loft can reveal roof leaks, poor insulation, and ventilation problems.
It can also show unsafe DIY wiring, cut trusses, and past repairs after water ingress.

The surveyor checks:

• Insulation and ventilation

  Thickness, continuity, and whether ventilation looks adequate.
  Poor airflow can lead to condensation and timber decay.

• Timbers and underfelt

  Signs of staining, mould, rot, and daylight through coverings.
  They also look for insect damage where visible.

• Alterations

  Cut members, added supports, and any changes that may need specialist review.
  This matters if you plan a loft conversion later.

Visible services: what gets checked, and what does not

A survey is not the same as a specialist test.
Surveyors carry out visual checks.
They do not dismantle boilers or test every circuit.

What you can expect: the surveyor will comment on visible condition, age indicators, and obvious risks.
If something looks wrong or dated, they will recommend a qualified electrician, Gas Safe engineer, or plumber.

If you are choosing between survey types, compare
RICS Level 2 Survey
and
RICS Level 3 Survey.
Ask yourself one simple question.
Do you want a general overview, or do you need a deeper inspection because of age, condition, or complexity?

What the surveyor notes that buyers often miss

Some of the most useful parts of a report are not dramatic defects.
They are practical risks that affect cost and hassle after you move in.

• Ventilation and condensation risk

  Trickle vents, extractor fans, blocked air paths, and cold bridging signs.
  These link to mould and damp issues in real life.

• Unsafe alterations

  DIY structural changes, removed walls, and conversions that do not show clear compliance.
  This can affect lending and future resale.

• Maintenance backlogs

  Multiple small defects that point to ongoing neglect.
  This is where budgets get blown after completion.

How you should use the report

A survey is only useful if you act on it.
Pick out the items that require work.
Price the repairs.
Decide what you want the seller to do, and what you will do yourself.

If you feel unsure, start with the common questions on
our FAQs page.