Not sure if that crack is normal? Get a licensed engineer's written opinion.
Almost every building develops cracks eventually — new construction settles, concrete shrinks as it cures, and CHB walls flex slightly with heat and humidity. Most of that is completely normal. But a small number of crack patterns are how a structure tells you something underneath it has actually moved, and those are the ones worth acting on before they get worse or more expensive to fix. Here's how a licensed engineer actually tells the two apart.
Three things matter more than "is there a crack": width, pattern, and whether it's still moving. A hairline crack that's been sitting there unchanged for three years tells a very different story from a 3mm crack that's doubled in width since last month — even if they look similar at a glance.
None of these on their own is an automatic emergency — but each one is a real, documented indicator engineers look for during a structural condition survey, and any one of them is a reasonable trigger to get a professional opinion rather than just repainting over it.
Cracks that radiate at roughly 45° from the corners of openings are the classic signature of differential settlement (one part of the foundation sinking more than another) or seismic racking. They're common enough that engineers specifically check for this pattern first during any inspection.
Width matters less than trend. Mark both ends of a crack with a pencil and today's date, then check it again in 2-4 weeks. If it's gotten longer or wider, something is still actively moving — that's a very different situation from a crack that's simply been there, unchanged, for years.
Check whether the same crack is visible on both the inside and outside face of an exterior wall, or if you can see light through it in a partition. A through-wall crack is a stronger signal than one that's only in the surface plaster or skim coat finish.
If a door or window that used to open and close normally now sticks, scrapes, or leaves a new visible gap, the frame is very likely out of square — usually because the wall or slab around it has shifted slightly. This is often the first thing homeowners notice, before they ever spot the crack that caused it.
A floor that visibly dips in the middle, or a beam that flexes noticeably underfoot or under load, points to a structural member that's overstressed, deteriorated, or was undersized to begin with. This one warrants a prompt inspection rather than a wait-and-see approach.
Hold a level or a weighted string (a plumb line) against a column or wall corner. Any building settles slightly over decades, but a lean you can actually see with the naked eye — or measure as more than a small fraction of the wall's height — is one of the more urgent signs on this list.
Patching covers the symptom, not the cause. If a crack reappears at the same spot within weeks or months of being filled and painted over, that recurrence itself is diagnostic — it means whatever caused it the first time is still happening.
A licensed engineer inspects the specific crack or condition in person and tells you, in writing, whether it's cosmetic or structural — and what to do next either way.
Book My ₱5,000 AssessmentThis is general guidance our engineers use as a starting point during a visual condition survey — not a substitute for an in-person inspection, since pattern and location can outweigh width alone.
| Crack Profile | What It Usually Means | What To Do |
|---|---|---|
| Hairline (<1mm), vertical or random, stable size | Shrinkage or minor curing/settling — very common in newer construction | Note it, recheck occasionally |
| 1-5mm, not obviously diagonal, unchanged over weeks | Could be either — not enough on its own to call | Mark, date, recheck in 2-4 weeks |
| Diagonal or stepped, 1-5mm, growing | Likely active movement — settlement or racking in progress | Get a professional opinion soon |
| >5mm, diagonal/stepped, and/or paired with sticking doors, sagging, or visible lean | Structural red flag — combined signals, not just one | Book an assessment now |
A single hairline crack rarely means much on its own. But a diagonal crack plus a door that now sticks plus the crack having grown since last month is a much stronger case for a real structural issue than any one of those three facts alone. Engineers look for combinations, not isolated symptoms — and so should you before deciding whether to worry.
Send a photo of the crack or condition plus a bit of context — building age, when you first noticed it — and we'll give you an honest initial read on whether it's worth a full paid assessment, before you spend anything.
No spam. We'll email you directly to ask a few quick questions about your building.
A coin or a ruler next to the crack in the photo makes the width unambiguous later — memory alone isn't reliable for judging whether it's grown.
This is the single most useful thing you can do. Any growth past the pencil marks over the following weeks is unambiguous evidence of active movement.
Do they still close flush? A crack paired with a new sticking door or window is a stronger combined signal than either sign alone.
If it's grown past your pencil marks, widened, or a door/window has gotten worse, book a structural assessment. If nothing's changed, it's more likely cosmetic — but a written engineer's opinion is still the only way to know for certain.
If any of the above applies to your building, the next step isn't a guess from a contractor or a neighbor's opinion — it's a documented engineering evaluation:
A licensed engineer inspects the specific cracks or conditions you're concerned about, along with the rest of the foundation, columns, and beams, for anything you may not have noticed.
Findings are evaluated against current seismic (§208) and wind (§207) load provisions to determine the structure's actual capacity, not just its visual condition.
You receive a signed report stating exactly where the building stands — no action needed, monitor, restrict use, repair, retrofit, or (rarely) evacuate — the same format a bank, insurer, or future buyer would accept as documentation.
If your building has already had a serious incident or you're responding to a government audit notice rather than your own observation, our companion article covers what DILG's structural audit program actually requires and who it applies to. And if an assessment does come back recommending intervention, our retrofit methods and real cost guide walks through what typically comes next.
Whatever you've noticed — a crack, a sticking door, a lean you can't unsee — the same engineering process answers the actual question: is this structurally significant, and what should you do about it.
AEDO Construction provides structural assessment and retrofit design nationwide, plus full design-build execution in Negros Oriental. One licensed engineer follows your building from first inspection through completed work — no handoff between separate firms.
Watching for pattern, width trend, and combined signals — not just "is there a crack" — is the same first pass any engineer runs before a full inspection. If your building shows two or more of the signs above, or just one severe one, the ₱5,000 assessment costs far less than finding out the hard way.
As a general rule of thumb: hairline cracks under about 1mm are usually cosmetic. Cracks between 1-5mm are worth watching closely and are a reasonable trigger for a professional opinion. Cracks wider than 5mm — about a pencil's thickness — or any crack still growing after you mark and date it, should be treated as a red flag until a licensed engineer says otherwise. Width alone isn't the whole story; pattern and location matter just as much.
Not always, but diagonal cracks — especially ones radiating at roughly 45° from door/window corners, or stepping along CHB mortar joints — are the pattern most associated with differential settlement or seismic racking. A short, thin diagonal crack in a skim-coat finish can still be cosmetic. But a diagonal crack that's wide, growing, or paired with a door or window that no longer closes properly is a strong combined signal that it's structural.
You can patch a cosmetic crack and it will simply stay patched. The problem is patching an active structural crack: it covers the symptom without addressing whatever is still moving underneath, and the crack — or a new one nearby — typically reappears within weeks or months. Recurrence at the same spot is itself a warning sign worth an assessment, not another patch job.
AEDO Construction offers a licensed-engineer structural assessment for ₱5,000 flat, with a written report delivered within 5 business days — a site visit, visual condition survey, and engineering evaluation of seismic and load capacity against NSCP 2015.
The report gives a specific finding and recommendation — no action needed, monitor, restrict use, repair/retrofit, or (rarely) evacuate. If intervention is needed, AEDO can quote and design the retrofit or repair work separately, or you can take the written report to any engineer or contractor you choose — it's your documentation either way.