A practical guide for homeowners in Brisbane, Moreton Bay, Ipswich, Logan and Redland.
Quick Facts – At a Glance
A bushfire overlay flags potential exposure; it is not the building’s final BAL rating.
BAL means Bushfire Attack Level and helps determine construction requirements.
Planning approval and building compliance are separate checks.
Moving the building may help, but clearing vegetation requires its own checks.
Budget for assessment first, then obtain the builder’s price for the assessed design.
What bushfire mapping means for your property
A granny flat can sometimes be built on bushfire-affected land. The outcome depends on the location, vegetation, slope, access and ability to meet planning and construction rules. A mapped area is not an automatic building ban.
The council overlay is an early planning screen. The building’s Bushfire Attack Level, or BAL, assesses exposure at the proposed building position. Two locations on the same property may produce different results.
Planning and building requirements
A planning assessment can consider the building position, separation from hazardous vegetation, emergency access, evacuation and firefighting water. A building assessment determines the construction requirements for the proposed home.
The National Construction Code includes requirements for buildings in designated bushfire-prone areas. The certifier confirms the applicable rules and supporting evidence. AS 3959 is the Australian Standard commonly used for bushfire construction; a general online BAL summary is not a specification.
Understanding the BAL result
BAL levels range from BAL-Low through BAL-12.5, BAL-19, BAL-29 and BAL-40 to BAL-FZ, the Flame Zone.
Higher exposure generally means more demanding construction requirements. The assessor considers vegetation, distance and slope, not simply whether a tree is visible from the window.
A higher BAL can affect windows, doors, screens, roof details, walls, decks and exposed areas below the floor. A low rating does not establish that there is no bushfire risk or remove other planning requirements.
What to check in all five council areas
For every council, check the local overlay, whether the land is designated bushfire prone for building purposes, the proposed position and BAL evidence, access and water requirements, vegetation controls and any planning assessment.
Brisbane
Check City Plan’s Bushfire overlay and relevant state mapping. Brisbane’s technical guidance calls for a Bushfire Hazard Assessment where affected land is proposed for assessable development.
That planning report is different from the BAL evidence used for building construction. Confirm both requirements, vegetation separation, access and water provisions for the actual proposal.
Moreton Bay
Use My Property Look Up and the Bushfire hazard overlay, then read the zone’s values-and-constraints requirements. These are the local rules responding to hazards and protected site features.
Council guidance identifies zone exceptions in the relationship between overlay mapping and building designation. Have the certifier confirm the property’s designation and current construction standard. Check access, water and lawful vegetation management separately.
Ipswich
Check City Plan 2025’s Bushfire Prone Areas mapping and fact sheet. Ask the planner or certifier which planning provisions and building designation apply to the proposed position.
Confirm whether a hazard or management report is required as well as BAL evidence. Include access, water supply, separation and clearing constraints in the review.
Logan
Use the adopted planning information in Logan PD Hub and check the Bushfire hazard overlay. Establish whether a planning assessment or management plan is needed for the proposal.
Have the certifier confirm building designation and BAL evidence. Check access and water requirements together with biodiversity corridors, protected vegetation and any title restrictions before assuming a cleared buffer is possible.
Redland
Check City Plan’s Bushfire hazard overlay and current state mapping. Council’s code identifies mapped hazard and buffer areas as designated bushfire-prone land for building purposes.
A site assessment or bushfire management plan may be needed. Confirm the proposed position, BAL, access and water arrangements, and whether environmental rules restrict vegetation work.
Can moving the granny flat reduce cost
Sometimes. Greater distance from hazardous vegetation may reduce exposure and simplify the construction response. Test alternatives during concept design before fixing the floorplan.
Do not assume trees can be removed to achieve a lower rating. Clearing can be restricted by council rules, state law, covenants or approval conditions. An approved bushfire strategy needs to work alongside those controls.
Indicative costs to allow for
All amounts below are in Australian dollars and exclude GST. Add 10% where GST applies. These are preliminary budgeting estimates for this guide, not quotations, fixed Hive charges or council fee schedules. Not every project needs every item, and complex work can exceed the ranges.
Possible cost
Budget estimate excluding GST
What it covers
BAL assessment for building design
A$500–A$1,500
Preliminary allowance for a straightforward assessment; confirm site inspection and written evidence.
Planning bushfire assessment or management plan
A$1,500–A$3,500
A separate allowance if a more detailed planning report is required; complex work can exceed it.
Bushfire related construction upgrades
Builder to price after the BAL is confirmed
Windows, screens, roofing, decking and subfloor details can all change.
A BAL assessment and a bushfire management plan may overlap in scope. Ask the consultant whether one quotation covers both, so the same work is not budgeted twice. Report fees do not include vegetation work, water tanks, access upgrades or special building materials.
Council fees and construction costs are separate. Consultant fees depend mainly on the scope and site, so the same budgeting approach can be used across all five council areas. Obtain a current, itemised quote for the actual property and check what is already included in your design or approval package.
Before you proceed
Confirm the constraint at the proposed building position, identify the reports and approvals actually needed, and have any design changes priced before committing to the final scope. A report supports assessment; it does not guarantee approval.
Request Your Free Site Assessment Report
Start with Hive Small Homes’ Free Site Assessment Report. This preliminary desktop review checks available information for likely setbacks, mapped underground infrastructure and easements, overlays and feasibility issues, subject to verification. It helps identify the next checks before detailed design. It is not a survey, on-site service location, specialist report or formal approval.
Click here to request your Free Site Assessment Report
Hive coordinates feasibility, design, consultants and the approval process. Construction is contracted directly between the homeowner and an independent QBCC-licensed builder.
Related Articles
Understanding Granny Flat Environmental Areas
Understanding Granny Flat Vegetation Protection, Koalas Overlay and Tree Clearing
Understanding Granny Flat Town Planning Approval
Understanding Granny Flat Flooding and Flood Assessment
Important Information
This article is general information, not building, planning, energy assessment, engineering or legal advice. Eligibility, floor area, approval pathways, specifications and pricing must be confirmed for each project by the relevant professionals. Published October 2026.
Official Sources
Queensland building in bushfire prone areas
Brisbane bushfire reporting guidance
Moreton Bay Bushfire hazard overlay
Ipswich City Plan 2025 overlay fact sheets
Logan PD Hub property reports and mapping
Redland development tools and property information
Cost References
Published service examples help establish the order of cost; they are not quotes for a Hive project or identical SEQ services. The ranges in this guide are budgeting estimates. Check the provider’s location, scope and GST treatment when comparing quotations.
Published bushfire report service examples
Published residential bushfire vulnerability assessment example
