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Floors can sink when the ground beneath your home moves, weakens or loses support. In New Zealand, this may be caused by subsidence, moisture changes, poor drainage, reactive soils, seismic activity, leaking pipes or weakened supporting ground. If your floors are sloping, dipping or separating from walls, it is worth arranging a foundation assessment.

Yes, sunken floors can be a sign of foundation movement, especially if they appear with wall cracks, sticking doors, gaps around frames or uneven concrete slabs. One issue on its own may have a simple cause, but several signs together can indicate subsidence or a sinking foundation beneath the home.

You should investigate uneven floors if they are getting worse, spreading across rooms or appearing with other signs of movement. Warning signs include cracked walls, jammed doors, sticking windows, gaps around skirting boards or sinking concrete. These symptoms may indicate the home needs foundation repair or re-levelling.

In many cases, yes. Sunken floors may be repaired using resin injection instead of traditional underpinning, depending on the cause of the movement and the condition of the home. Resin injection can help fill voids, strengthen weak ground and re-support the affected area with minimal excavation and disruption.

Resin injection involves placing engineered expanding resin beneath the affected floor or foundation through small injection points. As the resin expands, it fills voids, improves ground support and can help lift sunken areas back towards level. Mainmark uses this method to help re-support sinking floors and foundations in New Zealand homes.

Yes. Mainmark can assess homes with sunken floors, sinking foundations or uneven slabs and recommend a practical house re-levelling solution. Depending on the site conditions, resin injection may be used to strengthen the ground, re-support the foundation and carefully lift affected areas back towards level.

Sinking foundations are often caused by changes in the ground beneath the home. Common causes include weak soil, poor drainage, excess moisture, leaking pipes, erosion, reactive clay, seismic movement, tree roots or poor ground compaction. When the ground loses strength, parts of the home can sink unevenly.

The cost of sunken floor repair depends on the size of the affected area, how much the floor or foundation has moved, ground conditions, site access and the repair method required. A site assessment is the best way to understand the cause of the problem and receive a tailored quote.

Timing depends on the extent of movement, the size of the area being treated and the repair method required. Resin injection repairs can often be completed faster than traditional excavation-based methods because the process is targeted and the material cures quickly. Mainmark can confirm timing after assessing your home.

If cracks are caused by sinking floors or foundation movement, cosmetic repairs may not last until the underlying issue is addressed. It is usually better to assess and repair the ground or foundation first. Once the home has been re-supported or re-levelled, wall, floor or skirting repairs can be completed with more confidence.

Mainmark provides sunken floor repair, foundation repair, resin injection underpinning and house re-levelling solutions for homeowners across New Zealand. If you are searching for help with sinking floors or a relevel house solution near you, Mainmark can assess the issue and recommend a site-specific repair approach.

Mainmark is a specialist ground engineering company with New Zealand experience in sunken floor repair, sinking foundation repair, resin injection underpinning and house re-levelling. Homeowners choose Mainmark for practical site assessments, non-invasive repair methods and solutions focused on treating the cause of movement, not just the visible symptoms.