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Sinking Piers

What’s making my house piers move?

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The most common causes of house pier destabilisation

House piers move or sink for a variety of reasons. In order to prescribe the correct solution to raise, stabilise or stop them from sinking further, understanding why the house piers are on the go is important. Want to know why your house piers are moving? Here are some of the most common causes.

Broken pipe in urban area

Leaking Pipes

When excess water soaks into soil, the soil becomes saturated and weak. When it comes to house piers, water leaking from cracked, broken or unconnected bathroom and kitchen pipes are a major cause of soil erosion, soil aeration and voids. The water from the leaking pipes travels into the ground, around your piers and pools into the soil, causing movement.

Clogged gutters

Poor Storm Water Drainage

If storm water drains near your home have overflowed with rain, excess rain can find its way towards your home’s foundations and house piers. Rain may stop, but the excess rain water will have nowhere to go except into the ground where your house piers are built. This weakens the soil upon which your house piers sit and begins downward movement.


Lengthy Drought

Reactive clay soils expand and contract under different weather conditions. They expand in cooler, wetter weather but contract when it’s hot and dry. If you’ve experienced a long drought, the reactive clay soil under your home may have contracted, causing sinking.



If your home’s built near a construction site, main road, railway line or airport, the ground under your home would be absorbing a tremendous amount of impact. Heavy vehicles like excavators, concrete mixing trucks, trains and planes can cause the ground to quake. The vibrations weaken the soil to the point your house piers are no longer stable.

Tree roots

Tree Roots and Vegetation

It’s less common, but another reason why your house piers are failing is thirsty vegetation. Some trees and sickly vegetation have an excessive amount of roots. Greedy for water, they find their way under and around your piers to suck every last drop of moisture out of the soil. As the soil dries up, your house piers shift.

Want your house piers checked out?

Experienced a lengthy drought or flood? Have leaking pipes? Live where heavy vehicles operate day in and out? Worried your house piers are moving?

We’d be happy to inspect them at ZERO COST.

When you work with us, we promise

  • Free structural inspections
    We take a look at your sinking floor piers at no charge.
  • Personal, friendly service
    We’ll treat your home as if it’s ours.
  • Simple, transparent quotes
    Our pier repair quotes come with easy to understand computer-generated drawings that detail our proposed solution.
  • Minimal disruptions to your life
    Stabilisation and re-levelling of your sinking floor piers shouldn’t take more than a day.
  • Minimal disruptions to your home
    We never knock down or rebuild floor piers.
  • Affordable pricing
    Unlike many other building companies, we only typically charge between $4,000 to $8,000 to underpin floor piers. See our full list of prices.
  • Permanent fixes
    We’re thorough in what we do, piers we stabilise stay solid for good.
  • 10-year warranty
    In the rare case your floor piers sink again, we’ll be back to fix them at no extra cost.

Book a FREE inspection of your house piers today!

Book a FREE inspection of your house piers today!

Don’t just take our word for it

  • We’re the Experts in Wall Crack Repair, Foundation Stabilisation and Damp Treatment

    What you can expect

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    Simple, transparent quotes

    Our quotes are easy to understand and accompanied by drawings detailing our solutions. No technical jargon – we promise.

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    Fixed, affordable prices

    Once the price has been quoted, that’s what the job is going to cost. We don’t add extra costs at the last minute. No tricks.

    Carry out repairs for free

    Permanent repairs

    Anything we repair or enhance stays that way. Otherwise we come back to carry out repairs again for FREE.

    Ten year warranty

    10-year warranty

    You’re covered for 10 years from the day we finish our work.

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