Tree Roots Damaging Your Pool: When to Remove vs Repair

Tree root intrusion is a slow-moving but relentless force. In the Hunter region, where older properties often feature mature native and exotic trees growing close to pools built decades ago, root damage is one of the most common reasons pools fail structurally and develop persistent leaks. The decision to repair or remove ultimately comes down to whether the root problem is isolated and repairable, or whether the roots have compromised the pool’s structural integrity to a point where repair costs exceed the pool’s useful value.

This guide explains how roots damage pools, how to assess whether repair is viable, and when removal is the more rational choice.

How Tree Roots Damage Pools

Tree roots follow water. A swimming pool, even a well-sealed one, is a constant source of moisture, from minor seepage around fittings, from ground moisture around the shell, and from the pool’s hydraulic pressure on the surrounding soil. Roots from trees as far as 15-20 metres away will grow toward this moisture source over years and decades.

The damage pathways are different for concrete and fibreglass pools:

Concrete pools: Roots work their way into expansion joints, cracks in the shell, and the gaps around pipe penetrations. Once inside, they expand as the tree grows, widening existing cracks and creating new ones. Water loss accelerates. In severe cases, root pressure can fracture the entire pool wall or floor. Root removal doesn’t fix the cracks, it just stops the immediate intrusion. The structural damage remains.

Fibreglass pools: The fibreglass shell is more flexible than concrete and less prone to cracking from root pressure, but fibreglass pools sit in a sand bed that roots can colonise. Root growth under and around the shell can cause uneven support and localised settling, leading to shell deformation, gelcoat cracking, and eventually leaks. The gelcoat-to-fibreglass bond can also delaminate where roots push against the exterior.

Underground pipework: Pool plumbing runs underground from the pool to the equipment pad. Tree roots entering pipe joints or cracks cause blockages and leaks in the hydraulic circuit, often the first sign of root intrusion you’ll notice (unexplained water loss, poor pump performance).

Signs Your Pool Has Tree Root Damage

If you’re experiencing any combination of these symptoms and there are mature trees within 15 metres of your pool, root intrusion should be high on the list of diagnoses. A licensed pool plumber can conduct a CCTV inspection of the underground pipework and a pressure test on the shell to confirm the extent of root damage.

Which Trees Cause the Most Damage in the Hunter Region?

Some species are far more problematic than others when it comes to pool and underground infrastructure. In the Hunter region and Lake Macquarie area, the most common culprits are:

• Camphor laurel, highly invasive, aggressive root system, extremely common in older Hunter suburbs
• Eucalyptus/gum trees, native but with extensive root spread; particularly common near Lake Macquarie and rural-fringe properties
• Ficus/fig species, highly destructive surface and subsurface roots; common in older Newcastle and Maitland streetscapes
• Paperbark (Melaleuca), moisture-seeking roots, particularly problematic near pools
• Jacaranda, large surface roots common in established Newcastle suburbs like Hamilton, Merewether, and Mayfield

Trees that are heritage-listed or protected under local environmental plans cannot be removed without approval, even if they’re causing pool damage. In Newcastle City Council and Lake Macquarie City Council areas, applications for tree removal on grounds of structural damage require an arborist’s report. This can complicate the timing of pool removal, you may need to address the tree first.

When Repair Is a Viable Option

Repair is worth considering when:

• The root damage is localised (one section of the shell, one pipe run)
• The pool is less than 20 years old and structurally sound everywhere except the affected area
• The source tree is small, recently planted, or can be removed
• The repair cost is clearly less than 50% of the cost of a new pool or equivalent landscaping
• You want to keep the pool and are prepared to address the tree concurrently

Concrete pool repairs for root damage typically involve epoxy injection of cracks, hydraulic cement at pipe penetrations, and relining of affected sections. For a well-defined crack, this might cost $2,000 to $6,000. For extensive damage across multiple areas, full resurfacing or structural gunite repair can reach $20,000 to $40,000.

Fibreglass pool repairs for root-related delamination or shell cracking involve gel coat repair and structural fibre reinforcement. Localised repairs range from $1,500 to $4,000; widespread damage approaches the cost of a new pool.

The problem with repair-only approaches to root damage is that the tree, if still in the ground, will continue the cycle. Repairing without addressing the root cause (literally) means you’re likely paying for the same repair in another five to ten years.

When Removal Is the Better Choice

Pool removal makes more sense than repair when:

• The pool is over 25 years old and showing multiple failure points, not just root damage
• The source tree is large, established, and either can’t be removed or is protected
• Root damage affects the entire shell, not just one section
• Repair estimates exceed $15,000 to $20,000 for what is already an aged pool
• The backyard would be more useful without the pool
• You’re planning to sell and the pool’s condition would hurt the sale

In many cases in the Hunter region, homeowners discover root damage in a pool that’s already 30-40 years old and was going to be a problem regardless. Root intrusion just accelerates the decision timeline. Committing repair dollars to an aging concrete pool with systemic problems is rarely good financial sense.

See our broader analysis on cracked and leaking pool repair vs removal and the concrete cancer repair-or-remove decision for related scenarios.

Timing the Removal Around the Tree

If the tree causing the damage is large and needs professional removal before the pool removal can proceed, coordinate timing carefully:

1. Engage a certified arborist to assess and, where permitted, remove or prune the problem tree
2. Allow time for tree removal approvals if council consent is needed (4-8 weeks)
3. Schedule pool removal after the tree is addressed, this prevents the risk of the root ball disturbing fresh pool removal backfill
4. Include stump grinding in the arborist brief, leaving a stump in place near a former pool excavation is an invitation for continued root activity into the backfill

Tree removal costs in the Hunter region range from $800 to $5,000+ for a large mature tree, depending on access and height. Factor this into your total project budget.

Soil Conditions After Root-Damaged Pool Removal

Pools where root intrusion has occurred often have more complex soil conditions than clean removals. Roots penetrating the pool shell and surrounding fill mean the soil profile around the pool has been disturbed over many years. After removal, you may find:

• Organic material (root mass) mixed through the backfill zone
• Voids where large roots have been removed
• Soil that doesn’t compact as predictably as undisturbed ground

This makes proper compaction testing more important, not less. See our guide on compaction certification after pool fill for what this involves.

The groundwater situation can also be affected, tree roots modify soil drainage patterns over decades. See our guide on groundwater table and pool removal in the Hunter if your block has a high water table.

Best Time of Year to Remove a Root-Damaged Pool

Root-damaged pools often have active water loss, they leak more than a healthy pool. This means drainage before removal is more complex, and the surrounding soil may be unusually waterlogged. The best time of year for removal in the Hunter region is during the drier months, March to September, when soil conditions are more stable and waterlogged ground less likely. See our best time of year to remove a pool guide for broader seasonal considerations.

Frequently Asked Questions

Can I just cut the roots and repair the pool rather than removing it? Sometimes, if the damage is localised and the tree can be removed. But if the source tree remains in the ground and the roots have caused widespread cracking or structural damage, the root system will re-establish and the damage will recur. Repair without addressing the source tree is typically a short-term solution.

How do I know if the tree or something else caused the pool cracks? A CCTV pipe inspection and shell pressure test by a licensed pool plumber will identify whether root intrusion is present in the pipework. A pool inspector can assess whether surface cracking patterns are consistent with root-driven uplift or differential settlement. For concrete pools with significant cracking, a structural assessment may be needed.

Are some pool types more resistant to tree root damage? Fibreglass pools are somewhat more flexible and less prone to cracking under root pressure than concrete, but they’re not immune. The bigger factor is the distance from the tree and the species involved. No pool type is truly root-proof if a large tree is close enough and old enough.

Do I need council approval to remove a tree that’s damaging my pool? In many Newcastle and Lake Macquarie suburbs, significant trees (generally over 3m high or with a trunk diameter over 300mm) require council approval for removal. Apply to your council’s tree management team with an arborist’s report documenting the structural damage. Processing typically takes four to eight weeks.

Will my home insurance cover tree root pool damage? Generally no, home insurance covers sudden and accidental damage, not gradual root intrusion over years. However, if a tree falls on the pool during a storm and causes structural damage, that may be covered. Check your policy’s wording carefully.

Is your pool showing signs of root damage? Don’t keep patching a structural problem, get a free assessment and quote from Hunter Pool Removals. We cover Newcastle, Lake Macquarie, Maitland, and the Hunter Valley.