Knockdown Rebuild Wahroonga — From $450K All-In
Fixed-price knockdown rebuild in Wahroonga 2076. Demolition, new home, all Ku-ring-gai Council approvals under one contract. No surprises, no variation trail.
HIA Member
MBA NSW0476 300 300Knockdown Rebuild Builder in Wahroonga
Wahroonga KDR splits between the heritage east-of-Pacific-Highway streets (full DA, character-sensitive design, slow approval) and the post-war west side (CDC sometimes, DA usually, faster path). Hospital precinct zoning on the western edge needs checking lot-by-lot. Demolition costs $40K–$65K with asbestos, tree retention, and access complexity. Realistic KDR turnkey for a 400m² premium two-storey: $1.8M–$2.6M.
Wahroonga's housing stock is mostly from the 1920s–1960s (heavy heritage stock), which is the era where structural bones either hold up or don't — and we see plenty of both across the suburb. For knocking down and rebuilding here, that history matters: asbestos survey before any demolition is non-negotiable, and licensed removal lands somewhere between $5,000 and $25,000 depending on what's actually there. Median price $3.0M–$4.6M on typical 800–1,500m² blocks. Class M ground, foundation cost band $15,000–$32,000.
Buildana manages the complete knockdown rebuild process in Wahroonga — from site assessment and architectural design through to DA or CDC approval, demolition management, and fixed-price construction to handover. One builder, one contract, one new home.
Read our KDR Cost Guide 2026 or use the Renovation vs KDR Calculator to compare options.
- New home in Wahroonga from $450K
- Ku-ring-gai Council DA and CDC approvals managed
- Demolition and asbestos removal included
- Class M soil — engineered slab design included
- Typical blocks 800–1,500m² in Wahroonga
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Wahroonga station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Why Knockdown Rebuild in Wahroonga?
Wahroonga is premium upper north shore — Knox Grammar, Sydney Adventist Hospital (the San), and Wahroonga Park frame the suburb. Blocks 800–1,500m², heritage Federation streetscapes east of the Pacific Highway, and one of the strongest school catchments in Sydney. The hospital precinct adds zoning complexity on the western edge. Wahroonga station puts the city around 32 minutes away. The northern boundary runs into Hornsby Shire at Waitara.
Wahroonga's established streetscape and median house prices of $3.0M–$4.6M reflect a premium location within Ku-ring-gai. Building costs sit above the metro average, offset by stronger capital growth and rental returns. Direct rail access from Wahroonga station adds genuine value to Wahroonga property. 1920s–1960s (heavy heritage stock)-era housing stock across Wahroonga is prime for knockdown rebuild — replacing dated layouts and materials with modern, NCC-compliant homes that maximise block potential. Class M soil (moderately reactive) is standard for Wahroonga — Buildana includes engineered slab design in every quote.
Knockdown rebuild in Ku-ring-gai is its own discipline — every job starts with a heritage check, a tree report, and a streetscape character assessment before a concept goes anywhere near a block. Council's Heritage Conservation Areas cover significant portions of Gordon, Killara, Pymble, Wahroonga, Warrawee, Roseville and Turramurra; demolish without consent and you lose the lot. Blocks generally run 800–1,400m² with Class M soil on the sandstone ridge and reactive H pockets in the Lane Cove valley suburbs (East Killara, South Turramurra, West Pymble, East Lindfield). Demolition costs run $35K–$60K because most of the housing stock is asbestos-era brick or fibro and the Tree Preservation Order limits site clearing. CDC is rarely the right pathway in Ku-ring-gai — full DA is the realistic plan, with 12–18 weeks typical assessment. Realistic KDR budget for a 350m² premium two-storey rebuild on a Pymble or Wahroonga block: $1.6M–$2.6M turnkey, depending on finish level.
Planning Controls — Ku-ring-gai Council
Ku-ring-gai LEP 2015 & Ku-ring-gai DCP. R2 Low Density: FSR 0.3:1 on lots under 1,200m² (sliding down to ~0.27:1 on larger lots), building height 9.5m, front setback 9–12m varying by streetscape, landscaped area 50%, deep soil 30%. Heritage Conservation Areas cover significant portions of Gordon, Killara, Pymble, Wahroonga, Warrawee, Roseville and Turramurra — heritage character assessment is required before any DA. Tree Preservation Order is one of Sydney's strictest: any tree over 5m high or 0.45m trunk circumference needs Council consent before removal. Bushfire planning (Planning for Bushfire Protection 2019) applies in St Ives, St Ives Chase, North Turramurra, North Wahroonga and bush-edge lots — BAL assessment is mandatory. The 2024 NSW TOD reforms permit medium density inside 400m of Roseville, Lindfield, Killara, Gordon, Pymble, Turramurra and Warrawee stations, but Council scrutiny on built form and tree retention remains heavy.
Knockdown-rebuild builder in Wahroonga — key facts
- Suburb
- Wahroonga, NSW 2076
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 800–1,500m²
- Soil class
- Class M
- Median house price
- $3.0M–$4.6M
- Home era
- 1920s–1960s (heavy heritage stock)
- Typical price range
- $450,000 – $1,200,000+
- Typical timeline
- 14–22 months including demolition
- Approval pathway
- CDC where eligible or DA for complex sites
Building in Wahroonga — Local Context
Ground Conditions That Affect Your Build
Class M is the rule across Wahroonga — moderately reactive. For your knockdown rebuild, expect engineered footings in the $15,000–$32,000 range. The variables that shift you up or down inside that band: building footprint, number of storeys, point loads (heavy stone benchtops, masonry feature walls), and whether the adjacent stormwater system needs upgrading. site access on tighter blocks adds a logistics premium, which is why we cost cranage and material delivery before signing, not after.
Ku-ring-gai Planning Context
Ku-ring-gai has its own LEP and DCP layered over State planning controls. For knocking down and rebuilding in Wahroonga, the practical impact: Ku-ring-gai Council's DCP sets local rules for streetscape character, materials palette in some precincts, vehicle crossover widths, and tree retention. R2 Low Density zoning on most Wahroonga blocks permits single dwellings, alterations, and additions. Buildana checks every overlay (heritage, bushfire, flood, acid sulfate soil, biodiversity) before quoting.
What a Rebuild Costs in Wahroonga
Wahroonga's median house price sits at $3.0M–$4.6M. That's the number that decides whether a knockdown rebuild stacks up financially. A new build at $3.0M–$4.6M+ replacement is well-supported by the local market and adds resale headroom on standard 800–1,500m² blocks. Buildana provides itemised quotes — no provisional sums, no allowances, no "as per engineering" line items.
Lifestyle Fit in Wahroonga
Wahroonga has a settled residential character.. Local landmark: Knox Grammar & Sydney Adventist Hospital (San). For families knocking down and rebuilding here, the design considerations that matter day-to-day: orientation for natural light (north-facing living wherever the lot allows), separation between adult and kids' zones, a kitchen that opens to outdoor entertaining, garage size that fits a real family vehicle plus storage, and a layout that doesn't require renovating again in 10 years as the kids grow. Buildana designs for the long arc of how families actually use a home, not just the showroom photo.
Ku-ring-gai Council Processing & Wahroonga Activity
Ku-ring-gai Council processes thousands of residential applications a year across the Ku-ring-gai LGA, and Wahroonga (2076) sits in the active end of that workload. For a knockdown rebuild, the realistic clock from lodgement to DA determination is 8-14 weeks. The applications that move to the front of the queue are the ones where every required document is correctly named, drawn to scale, and matched against the SEPP or LEP clause it's claiming compliance with. Buildana lodges every project at that standard — not because it's required, but because it's how you avoid sitting in the RFI loop for an extra month.
Builder's Take on Wahroonga
Timing on Wahroonga KDR: demolition 5–10 business days, slab 3–4 weeks post-demo, new home 24–40 weeks to handover. Total 7–11 months. Compared to selling and rebuying in the same suburb, you save ~12 weeks of dead time plus $80K–$140K in stamp duty and agent fees.
One-contract KDR in Wahroonga vs two-contractor (demo + builder separately): two-contractor looks cheaper on paper but the site risk transfers to you between the crews. Old footings, buried tanks, boundary disputes — all your problem. Buildana's single contract keeps the risk with the contractor.
Wahroonga vs Nearby Suburbs
Wahroonga vs nearby suburbs — key metrics for knocking down and rebuilding.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| Wahroonga2076this suburb | $3.0M–$4.6M | 800–1,500m² | Class M | 1920s–1960s (heavy heritage stock) | Wahroonga |
| Warrawee2074 | $3.2M–$4.6M | 900–1,500m² | Class M | 1920s–1960s (heavy heritage stock) | Warrawee |
| North Wahroonga2076 | $2.4M–$3.4M | 1,000–2,000m² | Class M | 1950s–1970s | Wahroonga (2 km) |
| Turramurra2074 | $2.8M–$4.2M | 700–1,100m² | Class M | 1920s–1960s (heavy heritage stock) | Turramurra |
Median price, soil class, and lot size shape build feasibility and final cost. Buildana assesses every site against these and other constraints during the free feasibility stage.
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Quality Promise
Every Buildana knockdown rebuild in Wahroonga is delivered under a fixed-price contract — site assessment through to defect-free handover.
How It Works
From First Call to Final Key
Site visit covers everything that affects the build cost: vehicle access for trucks and crane, services (sewer depth, water connection, electrical service rating), soil exposure for borehole, neighbouring construction, and any obvious heritage or tree constraints. Real numbers, not estimates.
⏱Architectural design for your replacement home, structural engineering for Class M soil, BASIX certification, and all approval documentation. Lodged as CDC (10–15 days) or DA (40–90 days) depending on design.
⏱Demolition runs 5–10 working days for a standard Wahroonga cottage — longer if asbestos volume is significant or the structure includes a brick chimney or solid-block walls. Asbestos work happens first under a controlled removal program before mechanical demo starts.
⏱New home built from engineered slab (Class M soil) to keys — fixed-price, milestone-based progress payments. Your project manager provides weekly updates.
⏱Walk through your finished home on your original Wahroonga block. OC issued, all services live, 6-year structural warranty, appliance manuals, and maintenance schedule.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
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Last updated: 1 April 2026
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