When the quote for a full pool removal arrives and the figure is $15,000 or $18,000, the alternative looks attractive: a partial fill-in at roughly half the cost. Drain the pool, punch holes in the bottom for drainage, fill with rubble, cap with soil. Done.
And for some homeowners, in the right circumstances, a partial fill-in is genuinely the right choice. But the Highlands pool removal industry, contractors, real estate agents and certifiers alike, has seen enough cautionary tales to know that the choice deserves more careful thought than the upfront cost comparison alone.
Quick Answer (BLUF)
Partial pool fill-in (leaving the shell in place and filling it) is cheaper upfront but creates potential problems: ongoing subsidence risk as fill material settles within the shell, limitations on building over the area, complications at resale (some buyers and agents are wary), and in some cases the pool still requires compliance documentation and council records updates. Full removal eliminates all of these issues permanently. The cost difference is real, but so is the long-term liability.
What a Partial Fill-In Actually Involves
A partial fill-in (also called a pool demolition fill-in) does not remove the pool shell. The process is:
- Drain the pool
- Break out a section of the pool floor (to allow water drainage from the cavity)
- Break off the pool coping and any raised walls above ground level
- Fill the cavity with rubble, crushed material or imported fill
- Cap with topsoil
- Compact and leave level
The pool shell, concrete or fibreglass, remains in the ground. Only the void is filled.
This is a legitimate and council-approvable approach. It’s faster and cheaper than full removal. And for some properties, large rural blocks where the pool area will never be built over, never sold, and never inspected closely, it may be entirely adequate.
But there are specific situations where it creates problems.
Problem 1: Settlement Within the Shell
A pool shell that remains in the ground retains its shape for years, but the fill material within it settles over time. Unlike undisturbed ground, the fill inside a pool shell compacts as moisture cycles, as the material consolidates and as the shell itself slowly degrades. The result can be:
- A visible rectangular depression in the garden surface, often noticeable within 2-5 years
- Uneven settling that creates tripping hazards on paved or lawn surfaces
- More pronounced settling in the Southern Highlands due to the climate’s wet-dry cycling and frost action
In a full removal, backfill is placed in properly compacted layers through the entire excavation volume, the surrounding undisturbed soil supports the fill from all sides. In a partial fill-in, the fill sits inside a hollow shell that provides no structural support and will deteriorate over time.
Problem 2: Limitations on Future Use
A partially-filled pool limits what you can do with the space above it:
You cannot build a structure over it without engineering. Most building professionals and certifiers will require a structural engineer to assess the bearing capacity of a filled shell before approving any footings above it. The shell may not be designed to carry the point loads of a new structure. See our building over a filled pool guide for what’s involved.
You cannot reliably plant large trees. As the concrete shell degrades over decades, it creates an underground obstacle that large tree roots cannot penetrate easily and may work around unpredictably.
Future owners may face unexpected issues. The next owner, if not clearly informed, may proceed with landscaping or construction unaware of the partially-filled shell. When they discover it (often during a subsequent renovation or council inspection), the disclosure history becomes important.
Problem 3: Resale Complications
This is where partial fill-in causes the most practical problems. When a property with a partially-filled pool is listed for sale:
Disclosure is required. A material fact about the property’s condition, including an in-ground structure, should be disclosed to buyers. A partial fill-in that’s not clearly disclosed and documented can lead to disputes post-sale.
Some buyers and their solicitors are wary. Experienced buyers or their conveyancers will ask about the partial fill-in, request the approval documentation, and may seek a structural engineer’s report. This can slow or complicate negotiations.
Agents may advise against it. Several agents in the Southern Highlands market have seen partial fill-in complications delay or reduce sale prices. The conversation “there’s a filled pool here, we did it properly with approval” is different from “there’s a filled shell, here are the records.”
The differential in buyer perception is real. A full removal, professionally done, with a compliance certificate and backfill compaction records, creates a clean, positive story. A partial fill-in, even done well, creates a more nuanced conversation.
Problem 4: Council Records and Compliance
In most cases, a pool that’s been partially filled still needs to be addressed in council records and on the NSW Swimming Pools Register. A pool that’s been filled but not formally approved and deregistered remains on the register as an active pool with all associated compliance obligations.
If you sell or lease the property, a Section 10.7 certificate will reflect the registered pool. A compliance certificate (required for many sales and leases) may be difficult to obtain for a partially-filled pool depending on how it was treated.
When Is Partial Fill-In Genuinely Appropriate?
Despite these cautions, there are situations where a partial fill-in is a reasonable choice:
- Large rural or semi-rural blocks where the filled area will remain as a garden or lawn indefinitely, the property won’t be subdivided and building over the area is not contemplated
- Properties where cost is the decisive constraint and the homeowner understands and accepts the long-term limitations
- Situations where a full removal is genuinely impractical, extreme access limitations, very deep pool, or other site constraints that make full removal disproportionately expensive
The key is making the decision with clear eyes, understanding the trade-offs rather than choosing the cheaper option simply because it’s cheaper in the short term.
FAQs
How do I know if my property has a partially-filled pool (if I’ve just bought it)?
Council records (obtainable through a Section 10.7 planning certificate) will show approved development on the property, which may include a pool fill-in approval. The NSW Swimming Pools Register will show registered pools. On-site, the rectangle of slightly different ground texture or vegetation pattern often gives away a previous pool location. A soil probe test can confirm whether there’s an in-ground structure below the surface.
If I chose partial fill-in years ago and now want a full removal, what does that involve?
The partial fill-in material must be excavated out, the shell must be demolished and removed, and the excavation backfilled and compacted properly. This is essentially a full pool removal with the added step of excavating the previous fill. It costs more than a standard full removal (because there’s extra material to handle) but less than if the original partial fill had not occurred. Confirm costs with a contractor who has inspected the site.
Does Wingecarribee Shire Council have a preference between partial and full removal?
WSC does not formally require full removal (partial fill-in is an approvable approach). However, the certifier assessing your CDC or DA will look at the proposed methodology against the relevant standards, and any concerns about structural adequacy or site safety will be addressed in approval conditions. There is no specific council policy in WSC preferring one method over the other, but a full removal tends to have fewer conditions attached.
Are there situations where a partial fill-in cannot be approved?
A partial fill-in may face approval difficulties if: the site has significant groundwater issues that would be exacerbated by leaving the shell in place; the property is in an area prone to ground movement; or the certifier has concerns about long-term structural adequacy. Discuss your site specifics with your certifier early.