Collie property, historic mining and subsidence: a 2026 seller guide

Some Collie buyers ask whether historic underground mining, current tenements or future operations affect a property. The answer cannot be inferred from the town name, a neighbour's experience or a general internet map. It depends on the legal parcel, planning controls, registered notifications and current authoritative information.

This article is general property-marketing information, not mining, geotechnical, engineering, legal, planning, insurance or valuation advice. Sellers should ask the Shire of Collie, relevant WA Government agencies, Landgate, a settlement professional and qualified consultants about a particular address.

Begin with the current Certificate of Title

Order a current title for every lot included in the sale. Review the owner, legal description, survey plan and registered interests with the settlement professional. A notification, memorial, easement or other entry needs its underlying document; the short title description does not explain the full effect.

Do not assume there is no issue because nothing unusual is visible at the property. Equally, do not tell a buyer that all Collie land is affected. The seller's job is to identify the actual parcel and collect evidence relevant to it.

Official source: WA Government — buy land titles, checked 15 September 2026.

Check the Shire's planning scheme and maps

Collie's Local Planning Scheme No. 6 includes special control areas. The scheme text says the purpose of its coal-resource special control area includes protecting coal resources from incompatible development and protecting development from past underground mining activities, including subsidence.

The scheme also provides for notifications on title in particular circumstances to advise prospective purchasers and successors that land may be affected by historic underground mining or operations on adjacent property. Whether those provisions apply to a particular parcel must be checked against current scheme mapping and professional advice.

Local planning source: Shire of Collie Local Planning Scheme No. 6 text, checked 15 September 2026.

Separate planning controls from mining tenements

A planning special control area and a mining tenement are different records. The WA Government's TENGRAPH Web displays mining tenement and petroleum title locations alongside other land information. Mineral Titles Online provides details of mineral exploration and mining tenements and supports official tenement searches.

Online mapping is useful for orientation, but sellers should not interpret a coloured layer as proof of a legal or engineering conclusion. Note the search date, layer and parcel used. If a result may be relevant, ask the responsible department or a qualified adviser what further search or document is needed.

Official tools: TENGRAPH Web and Mineral Titles Online, both updated 16 June 2026.

Understand what subsidence information can mean

Subsidence is ground movement associated with underground extraction. Historic research for the Collie Basin developed and refined models for predicting surface and subsurface movement. That regional research establishes why the issue is technically assessed; it does not tell a seller what is happening beneath an individual house today.

If there is a title notification, planning condition, engineering report or known history for the property, provide it to the professional team. Do not paraphrase a technical report into “no movement”, “safe forever” or “minor risk”. Record the author, date, scope and conclusion accurately and let a qualified person answer technical questions.

Research context: Minerals Research Institute of WA — Collie Basin subsidence project, checked 15 September 2026.

Inspect the property without making a technical finding

Before launch, walk through the home and grounds with appropriate professionals. Note visible cracking, uneven surfaces, drainage issues, sticking doors or recent repairs, but do not label the cause yourself. Many building symptoms have several possible explanations.

If the seller is concerned, obtain advice from a qualified building inspector, structural engineer or other suitable professional. Keep invoices, reports, permits and warranties for completed repairs. A fresh coat of paint should not be used to conceal a known defect from buyers or the agent.

Build a clear property history

Collect plans and approvals for the house, extensions, retaining walls, sheds and other substantial work. If an insurer, authority or engineer has previously assessed movement or damage, give those records to the settlement and agency team. Explain what was repaired, by whom and when, without extending the warranty beyond its written terms.

Older Collie homes often have a long story. Organising that story helps the licensed agent distinguish ordinary age and maintenance from matters requiring further investigation. Our older Collie home preparation guide covers the wider presentation process.

Use photography to show condition honestly

Professional images should present the home attractively while retaining an honest view of its condition and setting. Correct temporary clutter, clean surfaces and complete normal maintenance before the shoot. Do not digitally straighten a structure, remove a visible crack or alter the surrounding land to avoid a buyer question.

Southside Media can plan a balanced visual sequence across street frontage, rooms, improvements and land. For acreage or larger lots, lawful aerial imagery can clarify roads and surrounding context, but it must not be treated as a cadastral, mining or subsidence map.

Prepare a buyer-ready records file

• Current title and survey or deposited plan for each lot.
• Copies of title notifications and supporting instruments.
• Relevant planning scheme maps and the date checked.
• TENGRAPH or tenement search details where professionally advised.
• Building approvals, plans and completion records.
• Engineering, inspection or repair reports held by the seller.
• Invoices and warranties for completed work.
• A list of unresolved questions and the authority responsible.

Not every document should appear publicly. Give the complete file to the licensed agent and settlement professional, who can manage marketing, disclosure, buyer requests and contract preparation. Remove personal or security information from buyer-facing copies.

Use the latest Collie market data carefully

REIWA's Collie profile, updated 14 September 2026 for the 12 months ending August 2026, reported a $540,000 median house sale price, 20.1 per cent annual growth and a 15-day median time on market. The lower and upper quartiles were $468,000 and $600,000.

Those figures describe settled house sales across the suburb. They do not value a title notification, mining-related control or a particular building condition. A licensed appraisal must select relevant comparable sales and weigh the actual documents, location, improvements and buyer response.

Market source: REIWA Collie suburb profile, data updated 14 September 2026.

Approve the final wording against evidence

Check every claim about mining, stability, restrictions, development potential, repairs and approvals before publishing. Neutral wording and a path to the source are safer than a sweeping assurance. If a question remains open, identify the authority or professional the buyer should consult.

For works and approval records, read our Collie renovation and approval guide. It complements the title and planning checks in this article.

Accurate preparation will not guarantee a faster sale or eliminate buyer conditions. It can reduce confusion, support consistent answers and show that the campaign respects both Collie's history and the individual property's evidence.