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After nearby ground subsidence, check a home for new or changing signs of movement only from a safe position; a visual check can help you record concerns, but it cannot diagnose the cause or prove that a building is safe. Look for patterns inside and outside, document what you see, and contact a structural engineer if damage is concerning or changing. If the building appears at risk of collapse or material may fall, keep clear and follow local emergency and building-safety instructions.
What should you do before checking the house?
Put safety ahead of a complete inspection. Do not enter a building that appears unstable, stand beneath loose or damaged material, or go underneath a house if its foundation supports may have weakened. Do not enter a crawlspace or underfloor area unless you know it is safe to do so. If there is an immediate safety concern, leave the area and follow the instructions of the relevant local emergency or building-safety authority.
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Warning signs that justify staying clear include visibly leaning or distorted parts of the building, substantial new gaps, crumbling material that could fall, damaged supports, or a sound or movement that makes the structure seem unstable. You do not need to identify the exact hazard before moving away. Keep children, visitors, and pets out of the area, and do not stand close to an exterior wall merely to obtain a better photograph.
This is an observation and record-keeping exercise, not a pass-or-fail structural inspection. Do not dig around footings, remove wall or floor finishes, test supports, or try to repair structural damage based on what you see. A homeowner cannot establish the cause of movement or assess the building’s safety from visible signs alone.
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Reporting procedures depend on where you live. For example, Citizens Advice explains routes for people in England, while Queensland has its own Building and Construction Commission guidance. Neither process should be treated as the universal route. Follow your local authority’s instructions if there is an urgent risk.
If you rent or occupy a flat in a larger building, tell the landlord, building owner, managing agent, or other responsible party promptly. They may need to coordinate access, inspect shared elements, or apply the building-safety procedure for the area. Do not assume that a concern in your unit is isolated if walls, floors, roofs, or services are shared.
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What signs should you look for inside?
From a safe position, note cracks, gaps, or other changes in ceilings and walls; doors or windows that have started sticking or no longer open and close normally; and floors that appear sloping or uneven. Also record cracked or uneven tiles, loose or stretched floor coverings, separation between walls and floors, and damaged or crumbling material.
Look systematically rather than jumping from the most obvious crack to a conclusion. Move your view through each accessible room: ceiling and wall junctions, corners, around openings such as doors and windows, the wall-to-floor edge, and the floor surface. In a kitchen, bathroom, or utility area, note any visible change around pipe penetrations or fixtures without removing panels. In a loft, basement, or crawlspace, observe only from a position you already know is safe; do not enter simply because a sign is easier to see there.
Pay attention to whether more than one sign appears in the same area or whether changes are visible in several parts of the home. A collection of observations is more useful to a professional than an isolated description such as “there is a crack.” For example, a new gap at a wall-floor junction accompanied by a sloping floor and a door that now binds gives an engineer more context than any one item alone. A pattern still does not, by itself, prove subsidence or establish whether a structure is unsafe.
A sticking door or window can have other explanations. For instance, seasonal changes can affect older timber joinery, so that sign alone does not identify structural movement. Changes in humidity, swelling of materials, or ordinary wear may also affect operation. Record when the problem started and whether it affects one opening or several, rather than treating it as a diagnosis.
The Natural Hazards Commission Toka Tū Ake’s guidance on home foundations describes visible signs worth noting; they are prompts for observation, not a homeowner diagnosis. If a crack is hidden by furniture or finishes, record that it could not be viewed fully. Do not remove the finish to complete your checklist.
What should you check outside?
Without approaching an unsafe area, look at exterior walls and the point where the house meets the ground. Note visible cracks or crumbling, gaps at the house-ground interface, and soil that appears to have sunk, slumped, or moved away from the foundation. Record water ponding close to the house, visible damage to supports or pipework, and apparent drainage or water problems.
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Walk the perimeter only if the ground and building are stable enough to do so. From a safe distance, compare one side of the house with another: is the ground level lower than it was, has a path or patio separated from the wall, or does soil appear to have moved toward a low point? Note whether a retaining edge, fence, driveway, or other nearby feature has also shifted. These contextual observations may help an engineer understand the extent of ground movement, but they do not prove that the house itself has moved.
Look for a change in the junction between external cladding, masonry, steps, paving, or attached structures and the main building. A gap can be cosmetic, related to a separate structure, or evidence of movement; its significance depends on the construction and the pattern of other signs. Do not pry open a gap, insert tools, or expose a footing to see what lies behind it.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThese observations can help an engineer understand what has changed around the building, but they do not establish why it happened. Cracking and settlement can be cosmetic or more serious; possible causes include soil heave, disturbed or unstable ground, settlement beneath footings, changes in soil moisture, or poor drainage. Nearby subsidence may be relevant context, but a visual check cannot confirm that it caused a particular crack or other sign.
Do not dig to expose a footing or get closer to inspect pipework if doing so would put you at risk. Queensland’s guidance notes visible cracked pipework and maintenance issues such as leaks and blocked gutters and downpipes as things inspectors may record. You can report an apparent leak or drainage issue without attempting to investigate below ground yourself. If water is entering the building or pooling against it, record the location and timing and follow local advice about utilities and electrical safety.
How should you record what you find?
Make a dated log for each observation. Write down where it is, what you can see, when you noticed it, and whether it appears new or different from an earlier record. Take photographs that show both the wider location and the detail; where it is safe, use a consistent viewpoint for later comparison. Note changes in doors, windows, floors, or visible ground conditions as well as cracks.
- Give the observation a location. Identify the room, wall, ceiling, floor, or exterior side of the home. Be as clear as you can without entering an unsafe area. A simple sketch or marked-up floor plan can show the position of several signs.
- Describe what is visible. Record the type of change and its apparent extent in plain language. Separate what you observed from what you suspect it means. “Diagonal crack above the living-room door, first seen 14 November” is more useful than “subsidence damage.”
- Take context and detail photographs. Include enough of the surrounding area to show where the sign is, then a closer view. Keep the camera level where practical and include a date in your log. Do not approach loose material or an unstable part of the building for a better image.
- Take repeat observations from the same safe position. A consistent viewpoint makes later images easier to compare. Record the date, weather or recent wet/dry conditions if relevant, and whether the sign appears unchanged, larger, longer, wider, or accompanied by a new symptom.
- Record what you could not inspect. Note rooms, elevations, foundations, roof spaces, or services that were inaccessible or unsafe. The limitation matters to anyone deciding whether a fuller assessment is required.
- Share the record. Give your notes, sketches, and photographs to the structural engineer or relevant local authority so they can understand what you observed and when.
UK government guidance on structural assessments and investigations describes records that set out the inspection method and limitations alongside photographs, sketches, marked-up drawings, systematic findings, conclusions, and recommendations. Your log does not have to use engineering terminology; clarity and dates are more valuable than a guess about the cause.
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The Queensland Building and Construction Commission (QBCC) lists a 5 mm wall-crack example and a 2 mm concrete-floor-crack example among conditions classed as unacceptable under a referenced Queensland standard. Those are local examples, not universal safety cutoffs for homeowners. QBCC also refers to floor-level deviation measured with a 3 m straight edge in that standard context; that is not a general DIY diagnostic procedure. The guidance reviewed does not establish a worldwide crack-width threshold that determines whether a home is safe after subsidence.
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When should you contact a structural engineer?
Seek advice from a structural engineer when signs are concerning, appear to be changing, or raise a safety concern. Contact one sooner rather than later if several related signs occur, if movement is visible in more than one part of the building, or if ground changes and building changes appear together. An engineer can assess the observations, explain what the assessment covers and cannot cover, and decide whether further investigation or testing is justified.
An engineer’s role is not limited to measuring a crack. They may consider the building’s construction, the pattern and timing of movement, the condition of foundations and supporting elements that can safely be viewed, and the relationship between the house and surrounding ground. The scope should state what can be inspected, what access is needed, and what remains unknown. A visual visit cannot rule out hidden damage or establish the building’s load capacity without appropriate investigation.
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When arranging an assessment, ask what the proposed scope includes, how the inspection will be carried out, and what parts of the building may not be visible or accessible. A useful report should make clear which findings are direct observations, which are interpretation, and what conclusions or recommendations follow. UK government guidance describes these report elements, including scope, method, limitations, systematic findings, conclusions, and recommendations.
If additional testing or investigation is proposed, ask what unanswered question it is intended to address and how its findings will be used. UK guidance says testing may be considered when an engineer needs additional information, with the work tied to a defined knowledge gap. For example, the purpose should be clear enough to explain what the test could distinguish or confirm, rather than simply adding measurements. A geotechnical investigation is not automatically the first step; consider one if the assessing engineer recommends it to investigate ground conditions or the suspected cause.
When comparing professionals or proposals, check relevant experience with structural movement or foundation damage, local qualifications, the agreed inspection method, access and visibility limits, and the form of the report. Ask whether observations will be separated from interpretation and recommendations, what further work is optional or essential, and which local standards or authority routes apply. The most extensive proposal is not automatically the most appropriate; the work should answer the safety and movement questions at hand.
If you rent or live in a multi-unit building, tell the landlord, building owner, or other responsible party and follow the local building-safety process. For people in England, Citizens Advice describes reporting concerns to the owner or landlord and, in some circumstances, to the local council or Building Safety Regulator. Procedures elsewhere differ, so confirm the right route with your local authority. Queensland has a separate complaint and inspection route through its building commission, but that process should not be presented as a route for every country.
Why shouldn’t you repair cracks before getting advice?
A visual check cannot show whether the ground or foundation is still moving, so filling cracks, underpinning, re-levelling, or making another structural repair without an assessment can address the visible symptom while missing the cause. Repairs can also increase damage if foundations swell during a later wet or dry season. YourHome, Australian Government home-maintenance guidance, advises: “Seek professional advice from an engineer before repairing.” See its page on cracks and settlement for the repair caution.
Do not seal a crack merely to see whether it reopens, install a support, jack up a floor, redirect water against another part of the property, or excavate beside a foundation as an experiment. Such actions can change evidence, create a new hazard, or alter how loads and water move through the ground. Keep the area protected from further damage and ask the engineer what temporary measures, if any, are appropriate.
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Until a qualified professional has assessed a concerning sign, keep observing and documenting from safe positions rather than altering the structure. Do not interpret a crack’s appearance, a gauge-card reading, or an online threshold as permission to enter, stay in, or repair a building.
What a homeowner’s check can and cannot tell you
A careful visual record can show what signs you have noticed, where they are, and whether they appear to change. It can help an engineer focus an assessment and give an owner, landlord, or local authority a clearer account of the concern. It cannot identify the ground cause, measure structural capacity, rule out hidden damage, or establish that a building is safe to occupy.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteEven apparently minor signs need context. A single stable hairline crack may be unrelated to the nearby event, while a group of changes that develop over time may warrant prompt investigation. Conversely, the absence of visible cracking does not prove that foundations or buried services are unaffected. Do not make an occupancy decision solely from a checklist; follow professional and local authority instructions where a safety concern exists.
FEMA’s 2025 guidance on post-earthquake building repair and retrofit discusses structural damage examples in an earthquake context. It is not a subsidence-specific homeowner standard. Whatever the trigger, use such examples as context for seeking qualified help—not as a substitute for an assessment of the building and its circumstances.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Questions homeowners often ask
Does a 5 mm wall crack mean a house is unsafe?
No. The 5 mm wall-crack example cited by QBCC belongs to its Queensland standard context. It is not a worldwide safety limit, and crack width alone cannot establish the cause or condition of a particular building. A qualified local professional must assess the building, its construction, the pattern of movement, and the surrounding ground.
Can a crack-width gauge card tell me whether a crack is dangerous?
No. It can help record a visible width, but it cannot reveal the cause or determine structural safety. Keep any reading with dated notes and photographs for an engineer to consider, and do not approach an unsafe area to obtain a measurement.
Should I ask for a geotechnical investigation after nearby subsidence?
Not automatically. A structural engineer can assess the visible signs and recommend ground investigation if it would answer a specific question about the cause or inform the next step. It is not necessarily the default first appointment.
Are sticking doors proof that subsidence damaged my home?
No. Seasonal changes can affect older timber joinery, and other ordinary building changes can make an opening bind. Record which doors or windows changed, when, and whether other signs occurred nearby. An engineer must interpret the pattern.
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Should I go into the crawlspace to check the foundations?
Not if the space may be unsafe or supports may have weakened. A homeowner’s check should be made from a safe position. Tell the engineer what areas could not be viewed so the inspection can be planned safely.
What photographs should I take?
Take a wider image showing the room, elevation, or ground location and a closer image showing the detail. Use a consistent viewpoint for later comparisons where it is safe, and log the date and location. Never move loose material or approach an unstable wall for a better photograph.
Can I fill or plaster a crack while I wait?
Do not make a structural repair or conceal a concerning sign before getting professional advice. Repairs can miss the cause and may increase damage if foundations move again during a later wet or dry season. Document the condition instead and follow the engineer’s instructions.
Who should I notify if I am renting?
Notify the landlord, building owner, or managing agent and follow the local building-safety process. In England, Citizens Advice describes routes that can include the owner or landlord and, in some circumstances, the local council or Building Safety Regulator. Other jurisdictions use different agencies and procedures.
Frequently Asked Questions
Does a 5 mm wall crack mean a house is unsafe?
No single crack-width figure establishes safety everywhere. The 5 mm wall-crack example cited by QBCC belongs to its Queensland standard context; a qualified local professional must assess the building and its circumstances.
Can a crack-width gauge card tell me whether a crack is dangerous?
No. It can help record a visible width, but it cannot reveal the cause or determine structural safety. Keep any reading with dated notes and photographs for an engineer to consider.
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Not automatically. A structural engineer can assess the visible signs and recommend ground investigation if it would answer a specific question about the cause or inform the next step.
Are sticking doors proof that subsidence damaged my home?
No. Seasonal changes can affect older timber joinery, and a sticking opening alone does not identify structural movement. Record timing and related signs for an engineer.
Should I enter a crawlspace to inspect the foundations?
No, not when supports may have weakened or the space may be unsafe. Observe only from a safe position and tell the engineer what could not be inspected.
The Bottom Line
Stay out of visibly unsafe areas, record new or changing signs from a safe position, and do not repair or diagnose from crack size alone. Give your dated photographs and notes to a qualified structural engineer, and follow the building-safety route set by your local authority, landlord, or building owner.
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