Spotting cracks or movement in a home is worrying. Many owners and buyers across Lincoln, Lincolnshire and Nottinghamshire contact us because they have noticed something that “doesn’t look right” but are unsure if it is cosmetic or a sign of structural movement. This guide explains what to look for, why movement occurs, and when it’s time to call a surveyor.
Quick answer: key signs of structural movement
- Cracks that follow a stepped pattern in brickwork.
- Cracks wider than 5mm inside or outside the home.
- Doors or windows suddenly sticking or racking.
- Floors that slope or feel uneven.
- Gaps opening between skirting boards and floors.
- Bulging or leaning walls.
- Signs of dropping corners or sagging roofs.
- Fresh cracking after periods of rain or drought.
What do surveyors mean by “structural movement”?
Structural movement refers to a change in the position of a building’s loadbearing elements. Older homes across Lincoln, Lincolnshire and Nottinghamshire often move slightly over time due to age, moisture change, or settlement of the ground. Some movement is harmless and stabilised. Other movement is more recent or ongoing, which can affect safety, value, and insurability.
Surveyors break movement into broad categories:
- Historic movement – movement that has occurred in the past but is not ongoing.
- Seasonal movement – minor changes caused by soil moisture changes throughout the year.
- Differential movement – one part of a building moves differently to another.
- Ongoing movement – active movement that needs investigation.
Understanding the type and cause of movement is central to a detailed inspection such as a RICS Level 3 building survey.
Early signs of movement inside a house
Movement often becomes visible indoors before you notice anything outside. The following signs can help you decide whether a problem needs monitoring or specialist review.
Cracks in internal walls
Cracks appear for many reasons. Hairline cracks in plaster are often harmless, especially in older homes or recently redecorated rooms. More concerning cracks tend to show one or more of these patterns:
- Cracks running diagonally from door or window corners.
- Cracks wider at one end than the other.
- Cracks that continue through more than one floor level.
- Cracks reappearing soon after repair.
Doors or windows sticking
Timber doors often stick due to humidity, but if several doors on the same side of the home suddenly bind or no longer latch, this may indicate movement.
Gaps opening around skirting boards or ceilings
Uneven floor movement can create visible gaps between skirting boards and floors. Ceiling cracks directly above can also signal differential movement.
Uneven or sloping floors
Homes built before the 1920s often show slight dips or slopes. These are not always structural problems. Sudden slopes, bounce in floorboards, or floors dropping towards one corner are more concerning.
Cracks between walls and ceilings
These cracks can be due to movement in the structure below, especially if the gap widens over time.
External warning signs to look for
Outside the home, certain patterns are strong indicators of movement. The exterior often reveals more obvious signs than the interior.
Stepped cracks in brickwork
Cracks that follow a stepped path through mortar joints are classic signs of movement. If the crack continues through multiple bricks and widens at the top or bottom, further investigation is sensible.
Sagging or uneven rooflines
A dip in the roof may result from timber decay or movement in supporting walls. This is especially common in older stone or brick homes across Lincolnshire and Nottinghamshire.
Bulging or leaning walls
Bulging brickwork can occur where wall ties fail, where mortar has decayed, or where a wall has bowed due to load or moisture change. Leaning walls are a sign of structural stress.
Gaps around windows or doors
If the gap around frames becomes uneven or wider at one side, it may indicate the wall has moved.
Dropped corners of a house
A corner that appears lower than the rest of the building can indicate subsidence or settlement. This often links to clay soils, trees, or drainage issues.
When are cracks in walls serious?
Most UK homes develop cracks at some stage. The issue is not the presence of cracks, but the pattern, size, and behaviour over time.
Crack widths
- Under 1mm: usually cosmetic.
- 1–5mm: may indicate minor movement; monitor for change.
- Over 5mm: may signal structural movement.
- Over 15mm: often linked to subsidence or significant movement.
Patterns that suggest a bigger issue
- Cracks that run diagonally through plaster and brickwork.
- Cracks that widen quickly after heavy rain or drought.
- Cracks that continue through floors or ceilings.
- Fresh cracks in homes previously considered stable.
Cracks near extensions
Extensions often move at a different rate to the main house. Cracks at the junction between old and new parts of the building are common but may need checking if they widen or reappear.
Common causes of structural movement in UK homes
Movement happens for many reasons. A surveyor’s role is to narrow down the likely cause and advise whether monitoring, repairs, or further investigation is needed.
Subsidence
Subsidence occurs when the ground beneath a building sinks. Typical causes include:
- Clay soil shrinkage during hot, dry summers.
- Tree roots drawing moisture from clay-based soils.
- Leakage from underground drains softening the ground.
- Ground settlement after changes in load or removal of support.
Heave
Heave is the opposite of subsidence and occurs when soil expands, often after tree removal. It can push floors and walls upwards.
Settlement
Settlement occurs when a structure compresses the ground beneath it over time. Minor settlement in older homes is common and often historic. Recent or uneven settlement is more concerning.
Thermal expansion and contraction
Changes in temperature can cause materials to expand or contract, creating cracks in plaster, brickwork or render. Seasonal cracking that closes and opens across the year is often harmless.
Failure of building materials
- Timber decay in floors or roof structures.
- Brickwork deterioration due to moisture and frost.
- Failure of wall ties in cavity walls.
Construction defects
- Poor-quality foundations.
- Inadequate support during previous alterations.
- Incorrect installation of lintels or beams.
When to monitor and when to call a surveyor
Homeowners often hesitate to get help because they are unsure whether the issue is serious. The following guidance can help you decide when you should act.
Situations where monitoring may be enough
- Hairline plaster cracks less than 1mm.
- Cracks that have not changed for years.
- Minor seasonal cracks that open in summer and close in winter.
- Slight gaps around skirting in older homes.
Situations where you should call a surveyor
- Cracks wider than 5mm.
- Cracks that are getting larger over weeks or months.
- Doors and windows that suddenly begin to stick.
- Floor sloping more noticeably.
- Movement after tree removal.
- Movement linked to a drainage leak.
- Bulging or leaning walls.
If you are unsure and want clarity, you can request a focused inspection through our specific defect reports.
Comparison: cosmetic signs vs potential structural concerns
| Likely minor / cosmetic | Potential structural concern |
|---|---|
| Hairline cracks in plaster | Diagonal cracks through plaster and brickwork |
| Small gaps around skirting boards | Gaps that widen across weeks or months |
| Doors swelling in humid weather | Multiple doors sticking after dry or wet periods |
| Slight unevenness in floors of older homes | Floors sloping markedly or dropping at corners |
| Fine cracking in render | Cracks wider than 5mm in brick or block walls |
What a Chartered Surveyor will do if movement is suspected
A surveyor’s job is to identify the pattern, cause and risk of movement and guide you on next steps. When you book an inspection with Lyman Marshall Chartered Surveyors, the process usually includes the following steps:
Full visual inspection
The surveyor reviews all internal and external areas. They record crack size, pattern, direction and any historical repairs.
Damp and moisture checks
Moisture can weaken brickwork, floors and foundations. Damp readings are taken to assess links between moisture and movement.
Review of drainage and nearby trees
- Distance of trees from the building.
- Species type and water demand.
- Signs of drain leaks or damaged gullies.
Monitoring advice
In some cases, the surveyor may recommend monitoring the cracks over a period of months to understand the behaviour.
Repair guidance
The surveyor outlines remedial options. These may include drainage repairs, localised rebuilding, strengthening work or specialist engineering input.
When a more detailed survey is advised
If the issue affects the structure more widely, the surveyor may suggest a full inspection such as a RICS Level 3 building survey.
If you are in Lincoln, Lincolnshire, Nottinghamshire or nearby and see changes in your home, contact our surveyors in Lincoln for guidance.
Frequently asked questions
Are all cracks a sign of structural movement?
No. Most homes develop small cracks in plaster or paint. Larger cracks, stepped cracks in brickwork, or cracks that keep returning should be checked.
What crack width should I worry about?
Cracks wider than 5mm may indicate movement. Wider cracks or cracks that grow over time should be reviewed by a surveyor.
Do cracks always mean subsidence?
No. Movement may relate to settlement, moisture change, thermal expansion, or older building materials. Subsidence is only one possible cause.
Should I worry about cracks after a hot summer?
Clay soils shrink in hot weather. Cracks that appear after heatwaves should be monitored. If they widen or new cracks appear, call a surveyor.
Is movement common in older homes?
Yes. Minor movement is very common in homes over 100 years old. The key is whether the movement is recent or ongoing.
Should I buy a house with signs of movement?
Many homes with historic movement are safe and stable. A surveyor can help determine whether the issue is historic or still active.
Can I fix structural movement myself?
No. Movement needs proper assessment to confirm the cause. DIY repairs often hide the crack without addressing the underlying issue.
Do insurers cover movement?
Some policies cover subsidence, but you should always check the terms. Many insurers ask for surveyor evidence before agreeing to cover.
What should I do if cracks keep coming back?
Recurring cracks can indicate ongoing movement or moisture problems. A surveyor can help identify the cause.
How quickly should I act?
If cracks are significant or worsening, arrange an inspection soon. Early advice helps avoid costly repairs later.
If you are worried about movement in your home, contact Lyman Marshall Chartered Surveyors for clear advice and a detailed inspection. We cover Lincoln, Lincolnshire, Nottinghamshire and the surrounding areas and can help you understand what is happening and what to do next.
