Removing an old chimney can free floor space, simplify a roof repair or support a new room layout. It can also affect masonry above, adjoining walls, roof framing and weatherproofing. Before asking for a demolition price, establish which parts are to be removed and how the remaining building will be supported and made weather-tight.
For Australian homeowners, the key distinction is between removing a fireplace surround, removing an internal chimney breast and removing the complete chimney including the stack above the roof. These are different scopes. A quote that says “remove chimney” without identifying the retained structure leaves important safety, cost and finish questions unanswered.
Define exactly what you want to remove
Start with photographs and a floor plan showing the fireplace, chimney breast and the rooms it passes through. Ask the builder to explain the visible and concealed parts. An internal breast may support masonry above, and a roof stack may be connected to construction that is not obvious from the living room. The assessment should follow the structure through the house.
Describe the intended finished room. Will the wall become flat, will the old hearth remain, and will the floor finish continue across the removed area? A larger room is useful only if the remaining wall, floor and ceiling can be finished as planned. Include those outcomes in the brief before the demolition method is chosen.
If the objective is cosmetic, investigate whether the surround or fireplace opening can be altered without removing the chimney structure. Conversely, a leaking or unstable stack may need attention even if the internal fireplace is being retained. Keep the functional problem separate from the appearance you want.
Arrange a structural assessment before demolition
Load paths and retained masonry
A structural engineer or appropriately qualified building professional should determine how the chimney relates to the rest of the building. The proposed removal may require a designed support for retained masonry or changes to adjoining construction. Homeowners should not remove bricks from the base or assume a remaining stack will support itself.
Safe Work Australia’s demolition guidance treats planning and structural stability as important elements of safe demolition. The practical homeowner task is to appoint the right people and obtain a defined scope. Detailed demolition sequencing and temporary support belong with the responsible professionals, not a general online article.
Party walls and shared structures
In attached houses or shared buildings, the chimney may relate to a party wall or adjoining property. Ownership, support and access need investigation. Do not assume that the visible half inside your home can be removed independently. The designer and relevant legal or property adviser should establish the position before contracts rely on it.
Permission to enter is separate from approval to build
Scaffolding, roof access or protective work may require access to neighbouring land. Obtain appropriate written arrangements and follow any required notice process for your jurisdiction. A building approval does not automatically provide permission to use another owner’s property. Resolve this early because it can change the practical demolition method and price.
Check heritage and approval requirements
A chimney can be a significant part of a heritage facade or roofscape, even where the fireplace is no longer used. Check state and local heritage controls before deciding removal is acceptable. A conservation adviser may recommend repair or retention, or a different internal layout that preserves important fabric.
Use the heritage renovation approval guide to prepare the discussion. Provide photographs, the proposed extent of removal and the reason for the work. Do not treat an old chimney as disposable simply because it is inconvenient or appears redundant.
Building approval requirements also depend on the scope and jurisdiction. Structural alterations and demolition may need documentation and inspections. Ask the relevant surveyor, certifier or council to confirm the pathway. Our guide to building permits for renovations explains why that decision should precede construction.
Confirm that the fireplace and services are redundant
Have the appropriate licensed trades identify and safely disconnect any gas, electrical or other services associated with the fireplace. An old appliance, decorative heater or later installation may have connections that are not obvious. Do not assume that an unused fireplace contains no active services.
Ask whether the flue serves another appliance or part of the building. The assessment should establish what remains in use and how it will be protected or altered. A chimney can contain more than one flue or reflect several periods of modification. Records and professional inspection are more reliable than assumptions based on the visible opening.
Keep disconnection documentation with the project records. The demolition contractor should receive confirmation before starting, and the builder should know whether any service reinstatement is required for the new room layout.
Assess hazardous materials before opening old construction
Older linings, coatings, hearth materials or associated products may need hazardous-material assessment. The chimney’s age and the history of later alterations can both matter. Arrange the appropriate inspection before demolition rather than expecting the contractor to identify every material while breaking it apart.
Our guide to identifying asbestos before renovation helps organise that process. Lead-containing coatings and contaminated dust may also require specialist management. Homeowners should not scrape, grind or sample suspect materials without appropriate advice.
Ask the contractor how dust, debris and soot will be contained, removed and disposed of. Protecting a furnished home requires more than laying a sheet over the sofa. Include the occupied areas, ventilation openings and access route in the site plan. Cleaning after demolition should be part of the agreed scope.
Roof reinstatement can be a substantial part of the job
Removing the stack leaves an opening that must be reconstructed and weatherproofed. Ask how roof framing, underlay or sarking, battens, roofing and insulation will be reinstated. The details depend on the existing roof system and condition. A patch of matching tiles or metal sheet is only the visible layer.
Check whether matching roof materials are available. An older tile profile or weathered metal finish may not blend perfectly with new material. Decide whether a local patch is acceptable or whether broader roof work is already planned. Record that aesthetic expectation separately from the requirement for a sound weatherproof repair.
Ask how the opening will be protected if permanent roofing cannot be completed the same day. Temporary protection and an adverse-weather plan belong in the contractor’s scope. Do not rely on the homeowner climbing onto the roof to adjust a tarpaulin overnight.
Internal making good needs a room-level plan
Removing a chimney breast can expose unfinished masonry, gaps in floorboards and discontinuous ceilings or cornices. The builder should identify how each will be repaired. A demolition-only price may leave a large amount of finishing work outside the contract, particularly where decorative plaster or original timber flooring is involved.
Consider the final wall plane. Retained masonry or new structural support may prevent the completely flat finish shown in an early sketch. Ask the designer to coordinate the structural solution with joinery, power points and furniture. It is better to discover a necessary projection before ordering fitted cabinets.
If the house contains original details, record them before work. Salvaging a mantel or decorative piece may be possible where safe and permitted, but it requires a separate handling and storage plan. Do not let a desire to reuse material interfere with hazardous-material controls or safe demolition.
Illustrative chimney removal costs in AUD
The following GST-inclusive figures are hypothetical planning ranges, not current national market averages. They show why the scope must be defined before comparing prices. Actual costs depend on structure, access, approvals, materials and reinstatement.
| Illustrative scope | Planning allowance including GST | Important exclusions to check |
|---|---|---|
| Removal of a redundant surround and limited non-structural finishes | AUD $2,000–$6,000 | Appliance disconnection, hazardous materials and major floor repair |
| Defined chimney breast alteration with designed support | AUD $10,000–$25,000 | Extent of retained masonry, engineering and complete decoration |
| Complete chimney removal with roof and internal reinstatement | AUD $18,000–$40,000 or more | Difficult access, shared structures, heritage work and extensive roof repairs |
For a hypothetical complete scope, allow AUD $2,500 for investigation and design, AUD $4,000 for access and protection, AUD $7,000 for removal, AUD $5,000 for roof reinstatement and AUD $4,500 for internal making good. The example totals AUD $23,000 including assumed GST, before any separate hazardous-material package or reserve.
Do not use these figures as a substitute for inspection. A short stack may still require costly access, while a taller chimney on an accessible site may be more straightforward to manage. Ask for the assumptions behind each quotation and compare the completed outcome.
Use a quotation checklist that covers the interfaces
- Mark the chimney sections to be removed and retained.
- Include structural design, temporary support and required inspections.
- Identify service disconnections and hazardous-material assessment.
- Specify roof reconstruction and temporary weather protection.
- Include floor, wall, ceiling and decorative reinstatement.
- Define access, disposal, cleaning and protection of occupied rooms.
Our renovation quotation comparison guide helps reveal whether one offer stops at demolition while another includes a finished room. The apparent price difference often reflects missing interfaces rather than a more efficient contractor.
Ask how discoveries will be handled. If opening the chimney reveals unexpected support or hazardous material, the contractor should make the area safe, document the finding and obtain the necessary advice. A clear variation process is preferable to an open-ended allowance for anything found inside.
Programme the work before new finishes
Complete structural alterations and dusty removal before installing new cabinetry, flooring and decoration nearby. Coordinate roof work with the weather and the required professional inspections. If other roof repairs are planned, ask whether access can be shared without compromising the sequence or responsibility for each task.
For an occupied home, agree which rooms remain usable and how they will be separated. Soot and fine dust can travel beyond the immediate fireplace area. The contractor should explain containment, ventilation management and cleaning arrangements. The household should not be expected to carry contaminated debris through living areas.
Include realistic dependencies in your renovation timeline. Engineering, permissions, service disconnections and roof-material availability can matter more than the number of days spent physically removing bricks.
Inspect the result from roof to floor
At completion, obtain the structural and approval records relevant to the work. Keep photographs of concealed support and roof details. Ask who inspected the work before it was covered, and retain documentation of any approved changes from the original design.
Review the room finishes against the agreed scope. Check the floor transition, wall alignment, ceiling repair and retained decorative elements. Ask the contractor to explain maintenance or review requirements for the roof patch. A visually neat internal wall does not establish that the roof opening was reconstructed correctly.
Confirm that disconnected services have been left safe and that no retained appliance has lost a required flue arrangement. Keep the relevant trade records. These details are particularly important when future owners cannot see where the old chimney once ran.
Keep the decision record with the house
Save a simple plan showing where the chimney was removed and where any support remains. Future renovators may otherwise assume a flat plastered wall contains no structural detail. Include the engineer’s drawing reference and photographs taken before concealment. This is particularly useful where only the lower breast was altered and masonry remains above.
If original materials were retained for reuse, record where they are stored and whether any handling restrictions apply. Do not leave heavy salvage stacked on a floor without the contractor’s agreement. A clear salvage decision prevents a pile of uncertain material becoming an unplanned storage or disposal problem after the builders leave.
Compare removal with repair before deciding
If the main issue is a leak or deteriorated mortar, a defined repair may preserve the chimney at lower disruption. If the chimney prevents a necessary layout change, removal may offer enough benefit to justify the structural and finishing work. Compare those outcomes using actual assessments rather than assume removal is always simpler than conservation.
Consider how much usable space will really be gained. A chimney breast may occupy a noticeable footprint, but the remaining wall geometry, structural support or furniture layout can reduce the practical benefit. Ask the designer to show the finished room with realistic furniture before committing to a complex removal.
Removing an old chimney works best when every interface is included: structure, services, roof, room finishes and approvals. Define those requirements first, then compare complete quotations. The goal is not merely an absent chimney, but a safe, weather-tight and properly finished home that supports the way you want to use it.