Structural Crack Observation Record Checklist

Give every crack a simple reference of its own, keep a list of them, and use that same reference on every photograph, note and message about it.

Without references, a conversation about the crack in the back bedroom collapses the moment a second crack is found in the same room.

Locate each one by room or elevation, by storey, and by its height above the floor and distance from the nearest corner, writing all of it down at the time.

Three references make a crack findable long afterwards even if the room has been redecorated or the furniture rearranged.

Note whether the crack begins at the corner of a window or door, at a ceiling or floor junction, at a change of material, or apparently in the middle of a plain surface.

Where a crack starts and stops is among the first things an engineer asks about, and it is easy for an owner to describe accurately.

Photograph each crack twice: once far enough back that the whole wall and its openings are visible, and once close enough to see the surface clearly.

A close-up on its own is almost useless because nobody can tell where on the building it was taken.

Write down what the surface is where the crack appears, as best you can tell from looking: plaster, render, painted masonry, mortar joints, tiling or a board finish.

The same crack means different things in different materials, and the material is something you can describe without any interpretation at all.

Describe which way the crack runs and where it begins and ends, using plain terms such as upright, sloping or across, rather than technical language you have read.

Plain description survives being passed between people, while borrowed technical terms often mean something slightly different to the reader.

Note whether the crack steps along the joints between bricks or blocks, or runs straight through them, and record that as an observation with no comment attached.

This is exactly the sort of detail a professional wants and exactly the sort an owner is most tempted to interpret.

What the shape or path of a crack indicates is for a qualified structural engineer to assess; nothing about its appearance allows an owner to conclude anything.

Note whether the crack looks wider at one end than the other, and if so which end, without attempting to measure it with anything you would call a gauge.

A described change along the length is useful; a home-made measurement risks being quoted later as though it were survey information.

Look along the surface from one side and note whether the two edges sit flush with each other or whether one side stands slightly proud of the other.

This is visible by eye from an angle and is difficult to see straight on, so it is regularly missed altogether.

Note whether the crack is open, appears to have been filled before, is bridged by paint, or has opened through a filled line that was there previously.

A crack reappearing through an earlier repair is a different observation from a new one, and only you know which it is.

Keep every word about causes out of your written record, however confident you feel, and note separately anything you were told by somebody else with their name against it.

Owner records travel far, and a single explanatory sentence gets repeated afterwards as though somebody qualified had written it.

Go into the room on the other side of the same wall, look at the matching position, and photograph what you find there whether or not anything is visible.

Finding nothing on the far side is a genuine observation and should be written down rather than left as a silence.

If the wall is an external one, look at the same position from outside at ground level, photograph the elevation, and note anything at that height and position.

The outside face is often more informative than the inside, and it can be photographed from where you are entitled to stand.

Do not use a ladder or climb to reach anything high on an elevation; photograph from the ground and leave the rest to a qualified professional.

Look at the same line on the storeys above and below, including in cupboards and on landings, and note whether anything appears in the same position.

A pattern running through several storeys is significant information, and it exists only if somebody looks for it deliberately.

Note whether you can feel a draught or see daylight at the crack, and record only that observation without pushing anything into the opening to find out more.

It is a legitimate observation that needs nothing beyond your eyes and the back of your hand, and it tells a professional something real.

Do not probe, rake out, pick at or push anything into a crack; disturbing it removes evidence a qualified structural engineer would want to see.

Write down where you looked and found nothing, so that the record shows the search was made rather than leaving the impression it was never carried out.

An explicit negative is trusted; a blank space is assumed to be an omission and gets checked again from scratch.

Mark the position you stand in and note it in writing, so that every later photograph of the same crack is taken from the same place and can be compared.

Photographs taken from varying distances and angles cannot be compared at all, which wastes the whole exercise.

Place an ordinary object such as a coin or a pencil in shot beside the crack, in the same position each time, rather than writing down a measurement.

A consistent object gives a professional a sense of scale without producing a figure that could be mistaken for a survey measurement.

Mark each end of the crack lightly in pencil with the date beside it, and write down the method you used so it can be explained to somebody who did not see you do it.

A dated pencil mark is simple, reversible and immediately understandable to anyone who looks at the wall afterwards.

Do not score, cut or fix anything into the surface to mark a crack; any physical monitoring arrangement is for a qualified professional to install.

Keep one running log with a dated line for each observation, naming the crack reference, who looked, and what if anything appeared different from last time.

A single chronological log is far more useful than notes scattered across a phone, a notebook and several conversations.

Ask a qualified structural engineer what monitoring would involve in your situation, and describe your own notes as observations rather than as monitoring of any kind.

The words matter, because a record described as monitoring can be relied on by others as though it had been set up professionally.

Owner photographs and pencil marks are not monitoring; only a qualified professional can establish whether monitoring is appropriate and how it should be done.

Never overwrite or delete earlier photographs and notes, and keep them in dated folders even where you believe nothing has changed.

The earliest record is usually the most valuable one, and it is the one most often lost during a phone upgrade or a tidy-up.

Note any internal door that began sticking, swinging shut on its own or failing to latch, saying which door and roughly when you first noticed it.

Doors are the most sensitive thing in a house and owners notice them long before anyone measures anything.

Note any window that has become awkward to open or close, or where the lock no longer meets its keep, and photograph the gap around the frame.

Window behaviour changes gradually and is easy to adapt to without ever mentioning it, which is why it belongs in a written record.

Note any gap opening between skirting and floor, between coving and ceiling, or where a fitted cupboard meets a wall, and photograph each with its reference.

These junctions often show change earlier than the wall surface does, and they are inside every room already.

Record anything you notice underfoot, such as a slope you can feel, a cracked tile line, a threshold that has lifted or a floor that has begun to sound different.

Plain description of what a floor does is genuinely useful and avoids producing figures that look like survey data.

Write down anything that changed inside the property around the same time, such as a leak, a new heavy item, a cleared loft or a room being heated differently.

Household changes are invisible to anyone visiting later, and they are exactly the sort of context a professional asks about.

Write down the weather at the time of each observation, particularly driving rain, a prolonged dry spell, a freeze or a sudden thaw.

Conditions at the time are among the first things a professional asks about and are impossible to recall accurately later.

Note whether the heating was running, whether the room had been unoccupied, and whether anything about how the property is heated had recently changed.

Rooms that are newly heated, or newly left cold, behave differently, and only the household knows which applies.

Record any leak, overflow, blocked gutter, burst pipe or persistent damp patch anywhere in the property, with the date and what was done about it.

Water events are frequently forgotten by the time anyone visits, and they are precisely what a professional wants dated.

Note any building work, excavation, road work or heavy traffic close to the property, saying where it was and roughly when it started and finished.

Activity nearby is visible only to whoever was there at the time, and it disappears from view completely once it is over.

Record any tree or hedge planted, removed or cut back near the property, and any change to paving, ground levels or drainage around the walls.

Changes outside are easy to overlook because they are not part of the house, and they are often the only thing that changed at all.

Look along the wall in low-angle light for a filled line, a band of different plaster or a repainted patch, and photograph anything you find near the crack.

Evidence of a previous repair changes the whole meaning of a current observation and is often visible only in raking light.

Find the report from when you bought the property and copy out its exact wording about cracking, movement or repairs into the same log as your own entries.

Its exact phrasing matters, because a professional will want to know whether something was described then in the same terms you would use now.

Look for older photographs that happen to show the same wall, including sale listing images, family photographs and pictures taken while decorating.

Incidental photographs are the closest thing most owners have to a record from before, and they are usually sitting in a phone or an old listing.

If you can reach a previous owner or a long-standing neighbour, note what they remember about the wall or about repairs, marking it clearly as recollection.

A previous occupant may remember a repair that generated no paperwork at all, which is often the only route to knowing it ever happened.

Gather any paperwork about previous repairs, repointing, replastering or work to the property, however incomplete, and keep it with your record.

Partial paperwork still tells a professional what has been attempted before and which claims should be treated with care.

Do not fill, paper over or decorate any crack you have recorded, and tell anyone else working in the property that these areas are to be left as they are.

Decorating over a crack is among the commonest ways an owner removes the only useful evidence they had.

Leave every recorded crack untouched until a qualified structural engineer has seen it and told you what should happen next.

Do not remove plaster, render or pointing to see what is behind a crack, and do not ask a tradesperson to open it up so you can have a look.

Opening up changes what can be observed and can make the situation harder to assess rather than easier.

Any opening up around a crack is investigation work to be specified and supervised by a qualified structural engineer, never arranged casually.

Write at the top of your record that nothing in it has been assessed by anyone qualified, so nobody reading it later mistakes an observation for a finding.

Records get read by people who were not there, and one line at the top prevents them being treated as a professional opinion.

Ask a qualified structural engineer what you should report straight away, and write that list down in their words rather than in your own summary of them.

Owners tend to under-report because they are unsure what counts, and a list in the original wording removes the hesitation.

Do not decide for yourself whether a change is expected or unimportant; report what you observe and let a qualified professional assess it.

Ask your own buildings insurer what they expect to be told and when, and record their answer rather than relying on what anyone else assumes about policies.

What one policy treats as routine another treats as notifiable, and the only reliable answer comes from the insurer holding yours.

Only your own insurer can tell you what your policy requires; nobody else can answer that question on your behalf.