Bilgola Plateau 2107 · Northern Beaches Council
Builders in Bilgola Plateau: Renovating Mid-Century Pole Homes
Sixty years on stilts in the bush. Time for a proper check-up.
Bilgola Plateau has some of Sydney's best mid-century homes: timber and glass perched on poles above sandstone slopes, surrounded by bush. They're special. They're also sixty years old, exposed to weather, termites and fire risk. Renovating one starts underneath.
Short answer
Is a mid-century pole home on Bilgola Plateau worth renovating?
Often, once an engineer has checked the poles, footings and bracing, because rot and termites at ground level are the usual failures. Decks and balconies are the next weak point. Bushfire ratings up to flame zone can push the project to a Northern Beaches DA, typically 12 to 16 weeks. New work costs around $2,600 to $3,130 per m².
Written and reviewed by Oliver Alameri
Licensed builder, NSW Contractor Licence 487805C · Founder, Buildana
Fact-checked
Start with the poles
A pole house sits on timber or steel columns set into footings in the rock, with bearers and floor framing on top. Where the poles meet the ground is where trouble starts: rot at the base, termite entry, corroded bolts and brackets, footings undermined by decades of runoff.
We inspect every pole and its connections, check for movement, and look at the bracing that stops the house racking sideways. Some older pole houses were built with less bracing than modern standards require. Adding more is usually part of any serious renovation.
A structural engineer reviews what we find and designs the fixes. A few replacement poles and new brackets, maybe. Or a full new substructure under the original house, which sounds dramatic but is often the cheaper long-term answer when half the poles have gone soft at the base.
- Pole bases checked for rot, termite damage and footing condition
- Bolts, stirrups and brackets checked for corrosion
- Bracing assessed against current structural requirements
- Drainage around footings reviewed and improved
Beautiful from the deck, but the story of a pole house is written underneath it.
Decks and balconies: the common failure point
Most pole houses have long cantilevered decks or balconies facing the view. Timber decks exposed to weather for decades can rot where the joists meet the house, and that connection is what holds the whole deck up.
Balustrades are the other issue. Older ones often don't meet current height and gap requirements. When a deck is rebuilt, the new balustrade has to comply, which also improves safety for kids and visitors.
On bushfire-prone land, a new deck close to the house also has to meet the construction requirements for the site's BAL rating, which affects the decking material, the framing and what's allowed underneath.
Own a pole house on the plateau?
Send me your Bilgola Plateau address and photos from underneath if you can get them. I'll arrange an inspection and tell you what needs fixing before any renovation starts.
0476 300 300Renovating inside, and bushfire upgrades
Once the structure is sound, the inside is where these homes shine again: opening walls to the view, new kitchens and bathrooms, and replacing tired single glazing with better windows.
Much of Bilgola Plateau backs onto bushland and rates anywhere from BAL-19 to flame zone. New work, including extensions and replaced windows, generally has to meet the construction requirements for the site's rating. We often recommend upgrading the existing house's ember protection at the same time, like sealing gaps, screening vents and fitting gutter guards.
Rated 40 or flame zone? Then complying development is off, and the project goes to Northern Beaches Council as a DA, typically 12 to 16 weeks.
Costs on the plateau
On the beaches, labour and materials run dearer than western Sydney. Apply Bilgola Plateau's 1.18 factor to Rawlinsons and new work comes out near $2,600 to $3,130 per square metre for standard finishes.
Structural repairs to poles, bracing and decks are priced from the engineer's report. Rock excavation for anything below the existing floor can be substantial on sandstone slopes. Bushfire construction adds to glazing and cladding costs depending on the rating.
Before renovating a pole house
Six checks that decide the scope and the budget.
- 01
Condition of every pole, footing and connection
- 02
Bracing against sideways movement
- 03
Deck framing, especially where joists meet the house
- 04
Balustrade height and gaps against current requirements
- 05
The site's BAL rating and what it means for new work
- 06
Drainage around footings on the slope
Pole houses on Bilgola Plateau
Is my pole house structurally sound?
Have the poles, footings, connections and bracing inspected. Signs of trouble include rot at pole bases, rusted brackets, bouncy floors and cracks in internal linings.
Does the deck have to be brought up to standard?
If the deck is being rebuilt or is part of the approved works, it must meet current structural, balustrade and bushfire requirements. Even if not required, old deck connections are worth checking.
Can I extend a pole house on bushfire-prone land?
Usually, yes, with the new work built to the site's BAL rating. The two top ratings, 40 and flame zone, push it into a DA with specialist design.
Are pole houses worth renovating?
Often, yes. The best mid-century pole houses have design qualities that are hard to replicate. The key is fixing the structure first so the renovation lasts.
Sources and references
Costs are from the Rawlinsons handbook with the local cost index applied; rules and timeframes are checked against the sources below.
Keep the character. Fix what holds it up.
A Bilgola Plateau renovation that starts with the poles and ends with a house you'll enjoy for another sixty years.