Pymble 2073 · Ku-ring-gai Council
Home Renovations in Pymble: Keep the Front, Rebuild the Back
Keep the house the street loves. Rebuild the part you live in.
Pymble's 1920s to 60s homes sit on big blocks, often under heritage controls and always under Ku-ring-gai's tree rules. A full knockdown is rarely approved or wanted. A partial demolition, keeping the front and rebuilding the rear to a far higher standard, usually is.
Short answer
Can I keep the front of my Pymble house and rebuild the back?
Yes. A partial demolition keeps the heritage-valued front rooms and replaces the rear with new living space, an approach Ku-ring-gai often supports. Expect a DA, usually 13 to 17 weeks and often 20 or more with heritage or significant trees. With Pymble's 1.32 loading, new space runs about $2,900 to $3,500 per m², and the new part can follow Passive House principles.
Written and reviewed by Oliver Alameri
Licensed builder, NSW Contractor Licence 487805C · Founder, Buildana
Fact-checked
What partial demolition actually means
The front rooms, roof form and street elevation stay. The rear, often a mix of later additions, a dated kitchen and a sunroom that never quite worked, comes down to the floor or the slab. A new wing goes up in its place.
For council it's a clear story: the heritage fabric the street sees is retained, and new work sits behind it, subordinate to the original. For you, it means modern living areas without losing the character that drew you to the house.
It needs careful demolition. The retained structure must be propped and protected while the rear is removed, and the junction between old and new is engineered, not improvised.
In Pymble, the front of the house belongs to the street. The back can belong to you.
Building the new part to Passive House principles
Passive House is a building performance standard focused on very low energy use and steady indoor comfort. Certification requires energy modelling, specific targets and independent verification. Not every project needs to go that far, but its principles are worth using in any new wing.
Continuous insulation without gaps. Airtight construction, tested with a blower door. High-performance double or triple glazing. Careful detailing to avoid thermal bridges where heat leaks through framing and slab edges. And mechanical ventilation with heat recovery, so fresh air comes in without throwing away warmth.
The result is a rear wing that stays close to the same temperature year-round, is quieter, and costs far less to heat and cool than the original house ever did.
- Continuous insulation around walls, roof and slab edge
- Airtightness, confirmed with a blower-door test
- High-performance glazing, sized and shaded for orientation
- Thermal-bridge detailing at frames and junctions
- Heat-recovery ventilation for fresh, filtered air
Keep the front. Rethink the back.
Send me your Pymble address and a few photos. I'll look at what's original, what's worth keeping and how a high-performance rear wing could work within council's rules.
0476 300 300Ku-ring-gai's rules: heritage and trees
Heritage conservation areas cover much of Pymble, especially near the station. Complying development isn't available there, so a DA with Ku-ring-gai Council is the path, usually 13 to 17 weeks and often 20 or more where heritage or significant trees are involved.
Ku-ring-gai protects trees more strictly than almost anywhere in NSW. Anything taller than roughly four metres, or with a trunk thicker than 200mm, commonly needs approval to remove, and refusals are common. A partial demolition that keeps the footprint close to the original often avoids tree conflicts altogether.
Budgeting a Pymble renovation
North Shore construction costs run well above the Sydney average. With Pymble's 1.32 adjustment to the Rawlinsons Sydney baseline, new floor area costs about $2,900 to $3,500 a square metre, standard finishes. High-performance glazing, airtightness work and heat-recovery ventilation add to that.
Restoration of the retained front, like repointing, joinery repair, re-roofing and leadlight, is priced separately. So is careful demolition and propping of the retained structure.
Before planning a partial demolition in Pymble
Six things that shape what council will approve and what it costs.
- 01
Heritage status of the house and the street
- 02
Which parts of the house are original and which are later additions
- 03
Trees on the site and near the proposed new work
- 04
How the retained structure will be propped during demolition
- 05
Energy performance targets for the new wing
- 06
A realistic DA timeline, allowing for heritage and tree referrals
Pymble renovation questions
What is a partial demolition?
Removing part of a house, usually the rear or later additions, while retaining the main structure and street front. It's common in heritage areas where full demolition wouldn't be approved.
Can I build a Passive House in Pymble?
You can build to Passive House principles in a new wing or new home. Formal certification needs energy modelling, specific targets and independent testing. We can build toward those standards and work with a certifier if you want certification.
How long does council approval take in Ku-ring-gai?
Council generally needs 13 to 17 weeks for a house, stretching further once heritage or significant trees are in the mix.
Do you renovate in West Pymble too?
Yes. West Pymble has more post-war and 1960s to 70s homes and generally fewer heritage controls, which can make renovations and extensions simpler.
Sources and references
Costs are from the Rawlinsons handbook with the local cost index applied; rules and timeframes are checked against the sources below.
Heritage outside. Comfort inside.
A Pymble renovation that respects the street and gives you a home that performs like new.