Describe the problem you see
Subsidence Alton
Help with subsidence in your Alton home
Stiff clay against the chalk scarp behaves in its own way. Hillside plots and older shallow footings are both in play here, so subsidence in Alton earns a closer look. Describe what you have noticed and find out what the crack means.
- Gault clay and greensand understood
- Cottages, villas and newer estates
- Clear next steps for your home
How specialists address foundation movement
Different ground conditions need different approaches. A specialist picks the method that suits the soil beneath your home and the type of damage showing on the walls or floors.
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Subsidence survey
A specialist examines the walls, measures the cracks and checks the soil to determine whether the movement is seasonal shrinkage or something deeper.
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Underpinning
Where footings sit too shallow for the clay, a specialist digs below them and pours new concrete to transfer the load to stable ground.
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Resin injection
A specialist pumps expanding resin into voids beneath the slab, compacting loose material and lifting settled sections without full excavation.
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Concrete cracking
A specialist cuts out failed sections of a drive or floor slab and replaces them with reinforced concrete tied back into sound edges.
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Screw piling
A specialist drives steel helical piles through unstable fill or soft clay until they reach a bearing stratum capable of holding the structure.
Ground conditions
Why Alton homes move differently from those on flat chalk
Upper Greensand and Chalk formations produce reactive clay subsoils on sloping residential streets. That geology shapes every repair decision.
- Summer cracks in clay soil Gault clay house cracks open as the soil dries out each summer. The clay shrinks away from the footings, and the wall above drops slightly. When rain returns, the gap often closes again.
- Sloping plots near the chalk scarp On a hillside, alton hampshire foundation movement can mean the ground is creeping downhill rather than simply shrinking. A specialist checks whether the slope itself is shifting before recommending any repair.
- Greensand versus Gault clay Greensand drains faster than Gault clay. Where a house straddles both, one side of the footing moves while the other stays put. That differential movement is what opens diagonal cracks in brickwork.
- Shallow footings on older houses Victorian and Edwardian cottages in town were built with shallow brick footings. They sit entirely within the zone where shrinkable clay swells and dries, so they move more than a modern deep-founded house.
- Recording the damage yourself Take clear photographs of every crack with a coin or ruler beside it for scale. Note the date. This record helps a specialist see whether the movement is getting worse when they visit.
Foundation repair services available in Alton
The mix of reactive clay, sloping streets and varied building ages means no single repair fits every house. Each method answers a specific ground condition found locally.
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Subsidence help in Alton
A specialist visits the home to map the cracks, check drain runs and identify the soil type. On Upper Greensand or Gault clay, they take samples to confirm how much the ground shrinks in dry weather. Crack monitoring in Alton usually starts here, with gauges fixed across the widest fractures to track movement over several months.
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Underpinning in Alton
Where monitoring shows continuous downward movement, a specialist excavates beneath the existing footings in short bays and fills them with concrete. Underpinning cost in Hampshire clay varies with depth, but on the stiffer Gault beds around town the new base rarely needs to go as deep as it would on softer soils elsewhere.
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Resin injection in Alton
For lighter settlement or voids left by leaking drains, a specialist drills small holes through the floor slab and injects structural resin. The material expands to fill gaps and compacts loose subsoil. This avoids the heavy excavation of traditional underpinning and suits terraced houses where access is tight.
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Concrete cracking in Alton
Concrete cracking in Alton often appears on garage floors and driveways laid directly over reactive clay. A specialist cuts out the broken slab, installs a membrane to isolate it from the moving ground beneath, and recasts the surface with reinforcement to resist future shrinkage.
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Screw piling in Alton
Screw piling is practical on a sloping garden with limited access because the equipment is small and produces no spoil. A specialist drives steel helical piles through the unstable topsoil until they bite into the firmer chalk or dense greensand below, then caps them with a beam to support the wall or extension above.
Towns covered around Hampshire
Specialist firms work across the county. Each area has its own geology, so the pages below explain what affects homes in that particular place.
If your town is not listed, describe your home on the contact page and ask whether help reaches you.