Logan Flood Mapping Changes 2026: What Homeowners & Buyers Need to Know
If you own a home in the City of Logan, south of Brisbane, or you're thinking about buying one, you might be interested in changes proposed by Logan City Council in October 2026.
On 6 October, Council endorsed the proposed changes, potentially affecting thousands of Logan properties.
Having been born and raised in Logan, with family still living in the area, these changes caught my attention. As a mortgage broker, I'm particularly interested in what they could mean for local homeowners and buyers.
What's Changing, and Why?
Logan City Council has endorsed a proposed Temporary Local Planning Instrument (TLPI) that would generally focus its flood planning overlay on the 1-in-100-year flood event, which has a 1% chance of occurring in any given year.
Previously, the mapping included much rarer events, including the Probable Maximum Flood.
Council estimates the changes could reduce the number of properties in the planning overlay by 56.8%.
Why Is Council Proposing These Changes?
The changes follow an independent review of the Logan and Albert Rivers Flood Study and more than 4,000 community submissions on the draft Logan Plan, many raising concerns about flood mapping.
The review confirmed the study followed accepted standards but identified opportunities to improve how rare and extreme flood events are used in planning.
Information about rarer floods, up to the 1-in-2,000-year event, would remain available in detailed mapping and reports. However, the Probable Maximum Flood would be removed from Council's mapping products.
Council also endorsed improvements to its Flood Portal and Property Flood Reports on 14 October to make flood information easier to understand.
When Will the Changes Take Effect?
The proposed changes have been submitted to the Queensland Government for approval. If approved, the TLPI will return to Council for formal adoption, with implementation expected in early 2027.
Importantly, these changes don't mean thousands of properties have suddenly become safer.
They primarily change how flood information is used for planning. Banks and insurers may use different flood information when assessing properties.
Will These Changes Reduce My Home Insurance Premiums?
Unfortunately, there's no guarantee your premiums will fall simply because your property is removed from Council's flood planning overlay.
Insurers use their own risk assessments, considering factors such as historical flooding, flood modelling and previous claims. Because the proposed changes don't necessarily reduce actual flood risk, insurers may not change their assessments.
But if your property is affected, I'd certainly be asking the question.
Once the updated mapping is available, ask your insurer whether it changes their assessment of your property's flood risk. If you believe they're relying on incorrect information, ask what data they've used and whether it can be reviewed.
When Was the Last Time You Reviewed Your Home Insurance?
Flood risks can change over time due to new developments, infrastructure changes and changing weather patterns. If you've held the same policy for years, it's worth checking whether your coverage still suits your property and circumstances.
It's also worth comparing quotes from other insurers and asking your existing insurer whether they can offer a better price. You might be surprised what they'll offer simply by asking, without needing to change insurers.
Just remember to compare the coverage, exclusions and excesses, not only the premium.
Will These Changes Affect My Home Loan Interest Rate?
Your lender won't change your existing interest rate simply because Council changes its flood maps.
However, if the changes influence a property's valuation, they could indirectly affect the interest rate available to someone purchasing or refinancing.
Lenders often offer different rates depending on your loan-to-value ratio (LVR), which compares how much you're borrowing with the property's value.
If a bank's valuation changes, your LVR could change too, potentially putting you into a different interest rate bracket.
It's the valuation and resulting LVR that could affect your rate, not the flood mapping change itself.
And while we're talking about interest rates, it's always worth reviewing your home loan periodically. Sometimes simply asking your bank for a better rate, or having your home loan broker review it for you, could save you money without needing to refinance.
How Could Flood Risk Affect Your Home Loan?
When you apply for a home loan, the lender assesses your financial circumstances and the property being offered as security.
A property valuation helps the lender understand what the property is worth and assess potential risks. These can include location, land characteristics, environmental concerns such as flooding, and local market conditions.
Depending on the property, lender and loan-to-value ratio, the valuation may be completed electronically or through a physical inspection.
Lenders also consider your income, employment history and other financial circumstances. It's the overall risk of the application that matters, not just one factor.
I've seen properties with higher risk ratings still receive finance approval without any objections from the lender.
If you're borrowing more than 80% of the property's value, lenders mortgage insurance (LMI) is often required, unless an exemption or eligible government scheme applies. Depending on the arrangement, the mortgage insurer may also assess the application.
A higher property risk rating doesn't automatically mean a decline, but it could influence the outcome if other aspects of the application are already borderline.
That's why home loan pre-approval doesn't guarantee a lender will accept every property you choose.
Has the Property Flooded Before? Here's How to Check
Logan City Council's interactive flood portal lets you search for an address and view the estimated extent of major historical floods in 1974, 2017 and 2022.
You can also explore different flood scenarios and download a property-specific flood report.
I'd recommend checking Logan City Council's flood information and mapping before buying, particularly if you're unfamiliar with the area.
Just remember that a property not appearing in a historical flood area doesn't guarantee it has never flooded or won't flood in the future.
Council's maps are a useful starting point, but a conveyancer or solicitor can arrange relevant property searches and advise on potential legal and planning risks.
What Should Homeowners and Buyers Take Away From This?
For existing homeowners, it's worth monitoring the changes and asking your insurer whether the updated mapping affects its assessment of your property.
For buyers, check the available flood information, obtain an insurance quote and remember that pre-approval doesn't guarantee a lender will accept every property.
And whether you're buying in Logan or elsewhere in Queensland, there's plenty worth knowing before making an offer or signing a contract.
Sources and Further Reading
Important information: This article is for general information only and does not constitute personal financial, insurance, legal or credit advice. Hello Home Loans provides mortgage broking and credit assistance, not insurance or legal advice. Information is current as at publication and may change. Consider your individual circumstances and seek advice from an appropriately qualified professional where needed.