What Does a Surveyor Look For During a Home Survey?

If you are buying a home, one of the first questions that comes up is what a surveyor actually looks for during a home survey. Many buyers assume it is a quick walk-around that points out obvious defects. In reality, a good survey is a systematic, trained assessment of condition, performance, and future risk — working from roof to foundations.

This guide breaks down exactly what a RICS surveyor checks, area by area. If you want to know how long the inspection takes, that is covered separately.

Quick reference: what a surveyor checks

A home survey is not there to fail a property. It is there to inform you. Surveyors consider how the building has been constructed, altered, and maintained — and how it is likely to perform for the next owner. The report gives you the information to make a decision, renegotiate if defects are significant, or budget for remedial work.

What surveyors check outside the property

External inspection is the starting point because many internal problems originate on the outside of a building. Rainwater, structural movement, and deferred maintenance typically show their first signs externally.

Roof coverings and structure

• Missing, slipped, cracked, or displaced tiles and slates
• Condition of ridge tiles, verges, hips, and valleys
• Flashings around chimneys, dormers, and abutments — a common failure point
• Uneven roof lines or evidence of past patch repairs
• Apparent age of the roof covering — an older roof nearing end of service life affects future cost planning even when it looks intact

Gutters, downpipes, and rainwater goods

• Sagging or poorly aligned gutters that pool water
• Leaks at joints and around outlets
• Downpipes discharging against the wall rather than into a drain
• Staining to wall surfaces from past overflow

Blocked or leaking gutters are one of the most common causes of damp. They are frequently overlooked because they appear minor, yet repeated wetting of the wall can cause significant long-term damage.

External walls and pointing

• Condition of brickwork, stonework, or render — each weathers differently
• Mortar erosion, failed repointing, or incompatible repair mortars
• Cracking — assessed for pattern, width, and likely cause: settlement, thermal movement, or something more significant
• Previous repairs, including patches that may not be compatible with the original construction

A single hairline crack may be unremarkable. Stepped cracking running through brick joints across a corner can indicate ongoing movement that warrants monitoring or specialist investigation.

Windows, doors, and external joinery

• Condition and operation of frames, sashes, and door leaves
• Decay in timber joinery — often hidden beneath layers of paint
• Quality of seals and glazing units
• Evidence of water penetration around frames
• Poorly fitting doors or windows, which can indicate movement or prolonged moisture exposure in the structure

Ground levels and site drainage

• Ground levels relative to the damp-proof course — high ground can bridge DPCs and allow moisture to track inward
• Evidence of standing water or poor surface drainage around the building
• Accessible outbuildings, garden structures, and boundary features

What surveyors check inside the property

The internal inspection works systematically through accessible rooms and spaces. The surveyor is looking at visible condition and identifying signs that point to hidden issues. Furniture, fitted carpets, and locked rooms cannot be inspected.

Damp, condensation, and mould

• Staining, tide marks, or salt deposits on walls — particularly at low level
• Peeling paint or wallpaper — at skirting level for rising damp, around cold bridges for condensation
• Mould growth and its location — position helps distinguish condensation from penetrating damp
• Musty smells, which often indicate moisture in floor voids or behind internal finishes

Surveyors distinguish between rising damp, penetrating damp, and condensation because each has a different cause and a different fix. What a Level 2 survey checks for damp is covered in detail on a separate page. Where damp is suspected but cannot be confirmed visually, the report will flag the risk and recommend further investigation.

Walls, ceilings, and internal finishes

• Cracks — location, pattern, and width all influence how seriously they are treated
• Staining on ceilings, particularly under bathrooms, around chimney breasts, and near roof junctions — these often indicate past or ongoing leaks
• Evidence of cosmetic repairs that may be concealing unresolved defects
• Bulging, detachment, or unevenness in plaster

Floors

• Unevenness or sloping — particularly relevant in older properties and does not always indicate a serious problem
• Excessive bounce or flex in suspended timber floors, which can suggest joist issues or sub-floor condensation
• Blocked or missing air bricks causing poor sub-floor ventilation — a common precursor to timber decay
• Signs of rot or beetle attack where boards or skirtings allow a glimpse of the structure

Loft and roof space

• Signs of water ingress — staining on timbers, wet or compressed insulation, daylight where none should be visible
• Condition of roof structure — rafters, purlins, ridge board, wall plates, and any previous repairs
• Insulation type and coverage
• Ventilation adequacy — poorly ventilated lofts accumulate condensation on the underside of roof coverings
• Alterations such as loft conversions — whether these appear to have been carried out appropriately and whether structural changes are evident

Fireplaces and chimney breasts

• Staining that suggests water ingress via the flue
• Cracking associated with chimney movement — common in older properties
• Sealed flues — should retain ventilation to prevent condensation; surveyors check whether this has been done correctly

Services: what surveyors assess and what they cannot

Home surveys include a visual assessment of building services only — no specialist testing is carried out as part of the inspection itself.

What the surveyor does assess:

• Apparent age and condition of the electrical consumer unit and visible wiring types
• Heating system — boiler age, visible pipework condition, type of controls
• Visible plumbing — pipework materials, tank types, condition of sanitary fittings
• Hot and cold water system where accessible

For a detailed breakdown of what the services inspection covers, see does a Level 2 survey check electrics and plumbing.

Where the visual assessment identifies risk factors — an outdated consumer unit, visible leaks, or ageing pipework — the report will recommend a specialist check by a qualified electrician or plumber. This is not a limitation of the survey; it is the appropriate way to direct you toward the right professional for the detail you need.

What a surveyor cannot check

Surveys are non-invasive by design. The surveyor does not lift floorboards, move heavy furniture, open up wall cavities, or test electrical circuits. Understanding this helps you read the report findings in the right context.

• Areas hidden behind fitted units, under carpets, or inside walls
• Gas appliance safety or boiler efficiency testing
• Electrical circuit testing — this requires a separate EICR from a qualified electrician
• Drainage inspections — CCTV surveys are a separate service and are often recommended for older properties
• Asbestos sampling or environmental testing
• Legal, boundary, or ownership matters

Where visible signs suggest a risk in any of these areas, the report flags it and points you toward the appropriate specialist. The report is designed to give you a prioritised, practical list — not a speculative list of every theoretical risk.

Common things surveyors flag quickly

Certain defects appear repeatedly across UK housing stock and experienced surveyors often identify them early in the inspection:

• Fresh decoration concentrated around cracks or damp-prone areas — a common presentation at point of sale
• Staining around chimney breasts and near roof junctions
• Blocked air bricks and inadequate sub-floor ventilation
• Alterations without apparent building control sign-off — removed load-bearing walls, extended footprints, loft conversions
• External defects that directly explain internal symptoms — for example, overflowing gutters causing wall damp that is incorrectly blamed on rising damp

Surveyors are trained to recognise patterns. A single issue may be minor. A cluster of related signs — high ground levels outside, staining at low level inside, and blocked air bricks — often tells a consistent story that the individual items would not suggest on their own.

How survey level affects what is reported

The type of survey you choose determines how much analytical depth you receive on each defect found. The surveyor inspects the same areas regardless of level, but the scope of reporting differs significantly.

• A Level 2 Home Survey covers condition, visible defects, and practical guidance. It suits most conventional properties in reasonable condition. See what a Level 2 survey includes in full.
• A Level 3 Building Survey goes further — providing analysis of likely causes, repair priorities, and implications in greater detail. It is usually the better choice for older, altered, or non-standard properties.

If you are unsure which level suits your purchase, the choosing the right survey guide works through it step by step, based on property type, age, and condition.

Getting more from your home survey

A survey works best when you engage with it actively rather than treating it as a box to tick. A few things that help:

• Share concerns from viewings — a specific crack, a damp smell, a room that felt cold — so the surveyor can give those areas closer attention
• Ask which findings have the greatest cost or safety implications if you are unsure where to focus after reading the report
• Use defects with clear repair costs to guide post-survey price negotiations
• If the report recommends a specialist check, commission it before exchange where possible — it keeps your options open and prevents surprises after completion