1. Cracking patterns that suggest movement
Cracks appear in most buildings — many are cosmetic. But certain patterns indicate structural problems:
Diagonal cracks from window and door corners — Classic sign of differential settlement or subsidence. The building is moving unevenly.
Stepped cracks following mortar joints — Often indicates foundation movement, particularly in older masonry buildings.
Horizontal cracks in walls — May suggest lateral movement, overloading, or wall tie failure.
Cracks through bricks/blocks, not just mortar — More serious than cracks following joints. Indicates significant stress.
Cracks that have been filled multiple times — Shows ongoing movement, not a one-time settlement.
What to do: Commission a pre-acquisition survey before proceeding. Understand the cause and likely remediation cost.
2. Evidence of water ingress
Water causes more building problems than almost anything else. Signs include:
Damp staining on walls and ceilings — May be current or historic. Either way, investigate.
Tide marks — Show where water has risen and receded, indicating flooding or persistent damp.
Efflorescence — White crystalline deposits on masonry, showing salts being drawn through by moisture.
Bubbling or peeling paint/plaster — Often indicates moisture behind the surface.
Musty smells — Dampness creates distinctive odours, especially in enclosed spaces.
Mould — Visible mould indicates persistent moisture. Also a health concern.
What to do: Determine the source — roof, walls, rising damp, condensation, drainage? Each has different cost and complexity implications.
3. Roof problems
Roofs are expensive to replace. Warning signs:
Ponding water on flat roofs — Water should drain away, not sit. Ponding causes accelerated deterioration.
Sagging or uneven roof surfaces — May indicate structural issues or deteriorated decking.
Visible patches and repairs — Multiple repairs suggest ongoing problems, not just maintenance.
Damaged or missing flashings — Where the roof meets walls, pipes, or other penetrations. Common leak point.
Blocked gutters and downpipes — Causes water to back up and overflow, damaging fabric.
Interior staining below roof level — Shows water has been getting through.
What to do: Get up on the roof (or have your surveyor do so). Age and condition assessment. Budget for replacement if nearing end of life.
4. Services that haven’t been maintained
Building services (heating, ventilation, electrical, plumbing) deteriorate and can be expensive to replace:
Aged distribution boards and wiring — Old electrical installations may not meet current standards and could require complete rewiring.
Obsolete heating plant — Old boilers are inefficient and increasingly difficult to maintain. Parts become unavailable.
No evidence of servicing — Gas safety certificates, electrical inspection certificates, service records. If they don’t exist, assume the worst.
Visible corrosion or deterioration — Pipes, radiators, equipment casings. Surface condition often reflects overall health.
Systems that don’t work properly — Running too hot, too cold, making noise, unreliable. Symptoms of underlying problems.
What to do: Check for certification and service records. Budget for replacement of aged systems.
5. Asbestos
Buildings constructed before 2000 may contain asbestos. Its presence isn’t necessarily a problem — undisturbed asbestos can be safely managed. But disturbed or deteriorating asbestos is dangerous and expensive to remove.
No asbestos survey on file — If no survey exists, you don’t know what you’re dealing with.
Survey shows asbestos in accessible locations — Higher risk of disturbance.
Deteriorating asbestos materials — Pipe insulation, ceiling tiles, floor tiles breaking down.
Planned works would disturb asbestos areas — Any refurbishment needs to account for removal costs.
What to do: Require an asbestos management survey (or refurbishment survey if works are planned). Understand what’s present and budget for management or removal.
6. Fire safety deficiencies
Fire safety failures can restrict use, require expensive remediation, and expose you to enforcement:
No fire risk assessment — Required for all commercial premises. Its absence suggests broader compliance issues.
Inadequate means of escape — Blocked routes, insufficient exits, excessive travel distances.
Missing or defective fire doors — Doors that don’t self-close, have gaps, or aren’t fire-rated.
No compartmentation — Fire spread should be limited by compartment walls and ceilings. Look out for holes for services, missing fire stops.
Absent or inadequate fire detection/alarm — May not meet current standards or building use requirements.
What to do: Commission a fire risk assessment if one doesn’t exist. Understand what remediation is needed and at what cost.
7. Planning and building regulations issues
Problems with consents can restrict use and be expensive to resolve:
Alterations without consent — Extensions, changes of use, or significant alterations may require planning permission and building regulations approval. If they weren’t obtained, the work may be unauthorised.
Change of use — Different uses have different planning requirements. Previous use may not match current or intended use.
Building regulations compliance — Even if planning permission wasn’t needed, building regulations probably were. Non-compliant work may need to be remedied or removed.
Enforcement notices — Check for any outstanding enforcement action against the property.
What to do: Review planning history. Check certificates and approvals for alterations. Consider regularisation applications for unauthorised work (where possible).
8. Environmental issues
Environmental liabilities can be significant:
Contaminated land — Previous industrial use may have left contamination. You could inherit cleanup liability.
Flood risk — Check flood maps. Consider insurance implications.
Underground storage tanks — Fuel tanks can leak, causing contamination.
Invasive species — Japanese knotweed and similar can cause structural damage and affect value.
Protected species — Bats, birds, etc. can restrict what you can do with the building.
What to do: Environmental searches. Site history research. Ecological surveys where relevant.
9. EPC and MEES compliance
Energy performance affects both legality and cost:
EPC rating of F or G — Below minimum standard for letting. Property cannot be legally let without exemption.
EPC rating of D or E — Currently legal but will be non-compliant when standards rise to C (expected 2027).
No EPC — Should exist for any property that’s been sold or let since 2008. Its absence is a red flag.
What to do: Check current rating. Assess improvement costs if below future standards. Factor into your offer.
10. Lease complications (for investment purchases)
If buying a tenanted property:
Tenant not paying rent — Check rent payment history.
Disputes in progress — Outstanding dilapidations claims, service charge disputes, etc.
Unusual lease terms — Break clauses, unusual repair responsibilities, rent-free periods.
Non-compliant occupation — Tenant using for purposes not permitted by lease.
Lease expiring soon — Void risk and re-letting costs.
What to do: Full lease review. Tenant financial checks. Understand what you’re inheriting.
Key Takeaways
- Movement cracking patterns indicate structural problems worth investigating
- Water ingress causes expensive damage — find the source
- Roof condition is expensive to remedy — budget appropriately
- Services age and deterioration may require full replacement
- Asbestos must be understood and managed
- Fire safety deficiencies can restrict use and require costly remediation
- Compliance issues (planning, building regs, EPC) can be expensive to resolve
- Get a proper survey — these issues are exactly what pre-acquisition surveys identify
Need Help?
If you’re acquiring commercial property and want to understand what you’re really getting, we can help. A pre-acquisition survey identifies these issues — and many others — before you commit.
Related Services:
- Pre-Acquisition Surveys — Comprehensive technical due diligence
- Building Pathology & Defect Analysis — Detailed investigation of specific concerns
- MEES Compliance & EPC Improvement Works — If energy performance is an issue
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