Custom home builder in bushfire area, difficult sites, unusual construction, mud brick, sloping sites, split levels, raked ceilings, steel frame, timber log homes. Current designs for new homes in high bushfire prone areasDesign & constructing homes in bushfire area's in Sydney, Hills District & the Blue Mountains

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(02) 4577 4912


Unit 1, No.103 Railway Road (North) MULGRAVE NSW 2756

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Proud Members of the
Master Builders Association of  NSW since 1968

Bushfire Protected Designed Homes

O'Mara Constructions has extensive experience designing & building new homes in high bushfire prone area's. Having lived in Hawkesbury all of our lives and with many of our sub-contractors we have experienced many bushfire's and seen the extent of fire on newly constructed homes & existing dwellings.



As per AS3959 which is the Australian Standard for Construction of buildings in bushfire prone areas there are six categories of bushfire attack levels. They are;

  • LOW
  • BAL 12.5
  • BAL 19
  • BAL 29
  • BAL 40

BAL simply means "Bushfire attack level"

Flame zone is the highest level of attack and is usually when a site backs directly onto this bush, surrounded by bushland or at the top of a steep embankment. The BAL rating can be classified by self assessment or by a fire consultant but needs to be approved by council after consultation with the RFS (Rural Fire Service)

The categories of attack are determined by:  

  1. The type of vegetation
  2. How close your building is to the vegetation
  3. What the effective slope is (i.e. fire runs more readily and with greater intensity uphill)
  4. The Fire Danger Index applicable to the region


New deck at Mount Wilson in high bushfire prone area

New deck using fire retardant treated timber

New deck using steel Duragal joists, hardwood & water tanks for bushfire protection

Mt Wilson completed 2008


Homes that are designed in bushfire prone area's need special consideration in design of certain construction elements.

The main considerations are, but not limited to;

  • floor framing (stumps, bearers & joists)
  • flooring sheeting & decking
  • sub-floor area enclosure
  • verandah posts & beams
  • windows & fly screens
  • water & gas pipes
  • water tank design & location
  • water pump & fire pump design & location 
  • gas bottle location
  • fire bunker design
  • external doors & garage doors
  • fascia & eave cladding
  • gutter & downpipes
  • roofing materials
  • roof penetrations & vents
  • balustrade & handrails
  • roof access
  • roof design
  • valuables safe for fire
  • roof penetrations

Gunderman home in bushfire prone area

New home near Wisemans Ferry in bushfire zone

Home with water tanks, metal cladding, gutterguard, rear deck

New deck using fire retardant treated timber


Many hopes built in bushfire affected area's are on sloping sites. This means standard slab on ground, brick veneer, tiled roof design, similar to many project homes simply don't work or any much too expensive and not practical.

There are numerous ways to design a home to suit the natural fall of the block in an economical way using specific materials that are lightweight but also bushfire proof. 

There are numerous cladding products that are not suitable and need to be selected depending on the BAL rating. There are also numerous types of floor systems that can be used to reduce costs, take advantage of any possible views, make sub-floor storage possible and be fire safe.

Contact our office for more information or to arrange a custom design to suit your site.


Stone entry steps in new Blue Mountains home

Leura home on sloping site & high bushfire area

Mount Wilson croquet pavilion 2013

New house built in
high risk bushfire area
in Wismeans Ferry


There are numerous "passive" controls methods of protecting the home from bushfire.

Each project needs to be evaluated on a case by case basis but can include any or a combination of the following items to provide protection;

  • overall house bushfire design
  • brickwork & blockwork
  • external cladding
  • compressed fibro
  • fire retardant treated timber
  • wire mesh screens
  • fire shutters
  • window glass selection
  • seals to windows, external doors
  • garage door design
  • gutterguard
  • roof access
  • signage
  • Assest Protection Zones
  • landscaping
  • pump location
  • tank location


Custom built Australian Colonial Home in a bushfire area

110,000 litre concrete water tank poured on site with storz valve for bushfire & RFS connection

Blue Mountains Country Home
Mt Wilson completed 2008


Other considerations need to be made for specific "active" control methods, such as;

  • water tanks, swimming pools, dams, wells, rivers
  • pumps
  • storz valves
  • hose reels
  • hydrants
  • sprinkler systems
  • driveway construction & access roads
  • gutterguard

We also need to consider the materials used, the location of services, access to site, maintenance, just to name a few.We can design & construct a fire bunker. This is NOT design as a safe haven but more as a last option when escape is not possible

We can design & construct a fire sprinkler system with back-up hose reels supplied by a pool/tank/dam to protect the home to suit the site conditions and owner requirements More information can be found at the NSW rural fire service website;


Fire sprinkler system - on roof ridge

Fire sprinkler system - sprinkler head close up

Fire sprinkler system - custom designed

Fire hose reel for owners use in bushfires


We have current designs of homes that although can't guarantee complete bushfire protection they can at least be adapted to minimise all possible risks and increase the safety of the owner and their possessions to suit the conditions on site.

All our design will need to be viewed and approved by the RFS priory to any approval be ing granted by council or any work commencing on-site

Custom home near St Albans in a high bushfire affected area

Custom home using specialised metal cladding for fire protection

Custom home on sloping site with bushfire protected materials & design

Specialise metal cladding for bushfire protection


There are numerous special requirements for BAL bushfire rated homes whether being BAL 12.5/19/29/40

However FZ (Flame Zone) bushier rated homes have numerous very specific requirements that differ from other BAL ratings.

These can add a lot of cost to the construction of a home compared to other BAL ratings and can easily be an additional $100,000 to $200,000 or more, depending on the site conditions & RFS requirements

There are however ways to reduce these costs while maintaining the high bushfire protection required for FZ area's in a practical way.

Please contact our office for more information

Roof started on FZ fire affected home

Roof & eave detail for FZ home under construction

Soffit detail for FZ home 

Custom built home in flame zone high bushfire area completed


The rules for requirements for bushfire shutters in FZ areas have recently changed.

Where previously a standard type roller door could be used fire shutters now have to be FZ rated.

These shutters are much more detailed, more expensive and can be manually or electrically operated.

There are also rules on how they are to be operated to ensure safety of the home during a bushfire event.

Please contact our office for more information


Flame Zone rated window fire shutter (Manual operated)

Flame Zone rated window fire shutter (Manual operated)

Flame Zone rated window fire shutter (Manual operated)

Flame Zone rated window fire shutter (Electric operated)


No one can (or at least should) guarantee that if you build a new home in a bushfire affected area that it will ever be "bushfire proof". Sometimes the fire is just too powerful & fast. 

However there any many ways that you can increase your chances of protecting your home and make it alot safer. Some are expensive and are not negotiable by the RFS & council. There are however many small design changes & material specifications that can be made that don't cost a fortune and will increase the fire protection of your new home, extension or renovation.

Please contact our office for advice on how to improve the fire protection of your proposed new project.

Flame Zone rated window fire shutter (Electric operated)

Water tank for bushfire fighting 

Storz valve for RFS connection

Custom built fire pump cover