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    What does a surveyor do and what do they look for?

    Whether you are buying or selling a home, the person responsible for making sure a house is structurally sound is a surveyor who specialises in property surveys. But what exactly do property surveyors do? Below we set out their key responsibilities, how they carry them out, and what that means for you as a potential buyer or seller.

    What They Look For
    Surveyor inspecting the condition of a residential property

    What is a surveyor?

    More than someone who checks houses.

    A property surveyor evaluates the quality and condition of a building — but that is not the only thing they do. Most specialise in particular areas to advise businesses, homebuyers, vendors and lenders, and they can value properties for mortgage lenders too.

    The role

    A surveyor establishes the condition of a building and explains what that condition means for the person paying for the advice — a buyer, a seller, a landlord, a business or a lender.

    Different Levels

    Surveys run in different levels, each a different depth of inspection and report. Matching the level to the age, condition and complexity of the property is the decision that matters most.

    Types of surveyor

    Different specialisms, different
    questions answered.

    The specialisms overlap, and job titles alone will not tell you who you need. The useful question is what decision you are about to make — buying a home, pricing a refurbishment, letting a unit, settling a valuation — and then finding the surveyor whose day-to-day work is that decision.

    Residential surveyors

    Houses and flats. They carry out Level 2 and 3 home surveys and residential valuations, and they are the people most buyers deal with during a purchase.

    Commercial surveyors

    Offices, retail units, warehousing and industrial premises. Their work covers market valuation, condition assessment and advice on how a building could be used, let or redeveloped.

    Building surveyors

    Condition and defects, across residential, commercial and historic buildings. They diagnose what has gone wrong, judge how serious it is and set out the repair and maintenance the building needs.

    Measured/Architecture surveyors

    A Measured / Architecture Survey records a building or site’s existing layout, dimensions and visible features, creating the measured information needed for floor plans, elevations, sections, site plans and as-built drawings.

    What they do

    Instrumental in the buying and selling of property.

    Property surveyors are responsible for a wide variety of tasks — they do more than just check houses. Day to day, this is the work.

    Inspect the property inside and out

    The inspection works through the fabric of the building in sequence: roof covering and structure, external walls, windows and doors, then internally through ceilings, walls and floors. Services — heating, plumbing and the visible electrical installation — are inspected visually rather than tested. Garages and outbuildings that form part of the property are included.

    Diagnose defects, not just list them

    Anyone can photograph a crack. The value is in the diagnosis: whether the movement is historic or progressing, whether the damp is rising, penetrating or condensation, whether the roof issue is a slipped tile or a failing structure. That distinction is what decides how urgent the repair is and what it will cost.

    Rate severity and set priorities

    Findings are graded so you can see what needs attention now, what can be planned for and what is simply normal for a building of that age. Depending on the level of survey, the report may also indicate likely repair costs — enough for you to budget and, where relevant, to reopen the price.

    Put it in writing

    The written report is the deliverable. It records what was inspected and what was not, sets out the condition of each element, flags anything urgent or safety-related, and identifies where a specialist investigation is needed before you commit.

    Value the property, where instructed

    A market valuation can be provided alongside Level 2 or 3 survey. It draws on the condition observed and on comparable local evidence, and where the condition is worse than the asking price assumes, it gives you a documented basis for renegotiating.

    Survey report setting out the condition of a property and its recommended next steps

    What they look for

    A strict list of criteria, checked
    every time.

    If you are considering a surveyor for a house purchase, they work against a set list of criteria to make sure you know what you are buying. Your surveyor will typically look for the following.

    Structure and movement

    The structural questions a surveyor is trying to answer:

    • Cracking in walls and ceilings — its width, direction and whether the pattern suggests movement or drying shrinkage.
    • Deflection in the roof: bowing rafters, a dipping ridge or spreading at the eaves.
    • Bulging, leaning or separating masonry, and whether restraint has been added.
    • Evidence of subsidence, heave or historic underpinning, and whether it has stabilised.

    Damp and moisture

    Moisture gets close attention because it affects both the health of the occupants and the fabric of the building. The point is to identify the mechanism, since the three common causes need entirely different remedies:

    • Rising damp — moisture drawn up from the ground through the wall base.
    • Penetrating damp — water entering through defective roofing, pointing, render or rainwater goods.
    • Condensation — warm, moist air meeting cold surfaces, usually a ventilation and heating problem.
    • The evidence itself: tide marks, staining, salting, blown plaster, black mould and musty odours.

    The site and its surroundings

    The land the property sits on and what is next to it carry as much risk as the building. A surveyor looks at:

    • Flood history, ground levels and how surface water drains away from the walls.
    • Nearby trees, their species and distance, on shrinkable clay soils.
    • Neighbouring industrial or commercial use, and any obvious contamination risk.
    • Noise and air quality from roads, railways or flight paths.

    Safety hazards

    Some findings matter because someone could be hurt before the repair is ever budgeted for:

    • Missing or inadequate handrails, balustrades and stair guarding.
    • Uneven, loose or trip-hazard flooring and thresholds.
    • Glazing in critical locations that is not toughened or laminated.
    • Visible electrical defects, and the absence of carbon monoxide or smoke detection.

    Common questions

    The surveyor's role at a glance.

    What is a surveyor?

    A surveyor is a property professional who establishes the condition or the value of a building and advises the client on what that means. Most specialise — residential, commercial, building, quantity or valuation work — and a chartered surveyor is additionally regulated by a recognised industry body.

    What types of surveyors are there?

    The main specialisms are residential, commercial, building, quantity and valuation surveying. They overlap, so the practical approach is to start from the decision you are making — buying a home, pricing building work, letting a commercial unit, settling a valuation — and choose the specialism that matches it.

    What defects do surveyors look for?

    Structural movement and cracking, roof deflection, damp in its three forms, timber decay, defective rainwater goods, failed pointing and render, and safety hazards such as inadequate stair guarding or non-safety glazing. The aim is to identify the cause, not simply record the symptom.

    Do surveyors check for damp?

    Yes, and it receives close attention because it affects both occupant health and the building fabric. The important part is identifying the mechanism — rising, penetrating or condensation — because each has a different cause and a different remedy, and treating the wrong one wastes money.

    Does a surveyor give an estimate for repairs?

    Defects are graded for severity and urgency, and depending on the level of survey the report may indicate likely repair costs. That is usually enough to budget realistically and, where the condition is worse than the asking price assumes, to reopen the negotiation with evidence.

    What is the difference between a survey and a valuation?

    A survey reports on condition and is commissioned by you. A valuation reports on worth and, where a lender instructs it, is commissioned for the lender. A valuation can be provided alongside a Level 2 or 3 survey, but it is not a substitute for one.

    Any questions?

    Know the property before you commit to it.

    Our surveys are carried out by Professionally qualified surveyors and give buyers and owners a clear picture of a property's condition. Findings help you budget realistically, prioritise the repairs that matter, and negotiate with the facts in front of you.

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