1. Cracking that follows concerning patterns
Not all cracks are serious. Hairline cracks in plaster often reflect normal thermal movement or minor settlement. But certain patterns warrant investigation:
Diagonal cracks from corners of openings
Cracks running diagonally from window or door corners, particularly if they’re stepped (following mortar joints in masonry), often indicate differential movement. The building is moving unevenly.
Horizontal cracks in walls
Horizontal cracking can suggest lateral movement, overloading, or structural tie failure. These need assessment.
Cracks wider than 5mm
Once cracks exceed about 5mm, they’re generally considered significant. They may indicate ongoing movement requiring intervention.
Cracks through bricks or blocks
Cracks that cut through the masonry units themselves (not just mortar joints) indicate significant stress.
Cracks that have reopened after repair
If you’ve filled cracks and they keep coming back, movement is ongoing. Stop filling and start investigating.
Tapered cracks
Cracks that are wider at one end than the other often indicate rotational movement — the building is twisting or tilting.
2. Doors and windows that no longer fit
When openings distort, doors and windows bind or don’t close properly:
Sticking doors
Doors that used to close freely but now catch on frames may indicate frame distortion from building movement.
Windows that won’t open or close
Similarly, windows that bind or show gaps at corners suggest the opening shape has changed.
Visible gaps appearing
New gaps around frames that weren’t there before indicate the structure is moving relative to openings.
These symptoms often accompany cracking. Together, they point to structural movement requiring investigation.
3. Damp that won’t go away
Persistent dampness indicates ongoing water ingress or moisture problems:
Recurring damp patches
Damp that reappears after decoration, particularly in the same locations, indicates an underlying problem that hasn’t been addressed.
Spreading dampness
Damp areas that are growing suggest the problem is getting worse.
Mould growth
Mould indicates sustained moisture. It’s a health concern as well as a building issue.
Musty smells
Persistent dampness creates distinctive odours even when not visible.
Efflorescence
White crystalline deposits on masonry show water is moving through the structure, carrying salts to the surface.
Damp has multiple possible causes — rising damp, penetrating damp, condensation, leaking services. Correct diagnosis is essential before effective treatment.
4. Movement you can feel
Beyond visible signs, physical sensations indicate problems:
Bouncy or springy floors
Floors that deflect noticeably underfoot may have inadequate support, deteriorated structure, or overloading.
Vibration from normal use
Excessive vibration from walking, traffic, or equipment suggests structural issues.
Floors that aren’t level
Noticeable slopes or dips indicate differential movement or failed support.
Walls that aren’t plumb
Walls visibly leaning or out of vertical suggest foundation movement or structural failure.
5. Roof issues
Roof problems often indicate broader structural concerns:
Sagging roof lines
Ridges that dip, roof planes that sag, or eaves that droop indicate structural distress in the roof frame.
Spreading
Roof spreading (walls being pushed outward by roof thrust) shows the roof structure is inadequate or failing.
Repeated leaks
Roof leaks that keep recurring despite repairs suggest more fundamental problems than failed patches.
Excessive deflection
Flat roofs that pond water may have inadequate structure or failed decking.
6. Foundation concerns
Signs that foundation problems may exist:
Cracks concentrated at low level
Cracking that’s worst near ground level often relates to foundation issues.
Adjacent trees
Large trees near buildings can cause subsidence (as roots dry out clay soils) or heave (as roots are removed and soil swells).
Changes in ground conditions
New drainage, excavation nearby, or changed water table can affect foundations.
History of subsidence
If subsidence has occurred before, further investigation may be needed, particularly for purchase or insurance.
7. Service failures
Building services can indicate broader problems:
Repeated electrical issues
Tripping circuits, failing equipment, or overheating may indicate installation problems requiring investigation.
Drainage problems
Recurring blockages, slow drainage, or smells may indicate damaged drains that need camera survey.
Water pressure changes
Unexplained changes in water pressure can indicate leaks or pipe deterioration.
Heating system failures
Repeated failures may indicate system-wide problems rather than component issues.
8. Changes over time
Any deterioration that continues or accelerates:
Things getting worse
Cracks widening, damp spreading, movement increasing — progressive deterioration needs investigation.
New problems appearing
Multiple new issues emerging may indicate a common underlying cause.
Faster deterioration
Problems developing more quickly than expected suggest something has changed.
9. After specific events
Certain events warrant investigation even without obvious symptoms:
After severe weather
Storms, flooding, extreme temperatures can cause damage that isn’t immediately apparent.
After nearby construction
Excavation, piling, demolition nearby can affect your building. If you notice anything different, investigate.
After the building has been unoccupied
Buildings deteriorate when unoccupied. Inspect thoroughly before reoccupation.
Before major works
If planning significant refurbishment, understand the building’s condition first.
Before purchase
Pre-acquisition surveys identify issues before you’re committed.
10. When intuition says something’s wrong
Sometimes buildings just feel wrong:
Occupant concerns
People working in a building often notice things changing before problems become obvious. Ignoring concerns often costs more later.
Unusual sounds
Creaking, cracking sounds, dripping water where it shouldn’t be.
Key Takeaways
- Cracking patterns matter — Diagonal from openings, horizontal, through masonry, reopening after repair
- Movement shows in fittings — Doors and windows that don’t fit anymore
- Persistent damp needs diagnosis — Different causes need different treatments
- Physical sensations indicate problems — Bouncy floors, vibration, slopes
- Roofs reflect structure — Sagging, spreading, repeated leaks
- Progressive deterioration — Anything getting worse needs investigation
- Trust your instincts — If something feels wrong, find out why
Need Help?
If your building is showing warning signs and you want to understand what’s happening, we can help. Building pathology investigation diagnoses problems properly and specifies effective solutions.
Related Services:
- Building Pathology & Defect Analysis — Diagnosing building problems
- Pre-Acquisition Surveys — Before you buy
Related Articles: