Greenwich Duplex Builder — Western Sydney Dual Occupancy
Buildana is a local Lane Cove duplex builder. We know which Greenwich streets support Torrens title subdivision, which suit strata, and what Lane Cove Council will approve. Free site feasibility.
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MBA NSW0476 300 300Quick Answer
A duplex in Greenwich costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Lane Cove Council approvals, construction and subdivision under one fixed-price contract.
Duplex Builder in Greenwich
Duplex in Greenwich is effectively impossible — Heritage Conservation Areas cover most streets. Realistic advice is extension/restoration. Mandatory paid feasibility.
Most Greenwich blocks run 500–1,200m² on Class M (sandstone ridges) / H–E (river fall) ground. Duplex feasibility hinges on lot size (550m² minimum under Lane Cove Council), frontage width, and whether your block sits inside any overlay — flood, heritage, biodiversity. Worth assessing before design spend. Median price band: $3.5M–$8.0M. Nearest rail is Wollstonecraft (1.5 km, ferry).
Buildana manages the full duplex development process in Greenwich — from feasibility assessment and architectural design through to DA or CDC approval, and fixed-price construction to dual handover. One builder, one contract, two homes.
Read our Complete Duplex Building Guide or explore duplex developments across Sydney.
- Dual occupancy in Greenwich from $750K
- Lane Cove Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 550m² in Greenwich
- Class M (sandstone ridges) / H–E (river fall) soil — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Wollstonecraft (1.5 km, ferry) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Why Build a Duplex in Greenwich?
Greenwich is the harbour-fall peninsula between Greenwich Point, Manns Point and Bay Road on Sydney Harbour. Federation mansions, inter-war heritage and contemporary harbour-fall builds on 500–1,200m² blocks. Heritage Conservation Areas cover most streets. Sandstone-dominant with substantial harbour fall. North Sydney LGA boundary east at Wollstonecraft. Greenwich ferry wharf. Premium for direct harbour outlook.
Greenwich's established streetscape and median house prices of $3.5M–$8.0M reflect a premium location within Lane Cove. Building costs sit above the metro average, offset by stronger capital growth and rental returns. Transport access via Wollstonecraft (1.5 km, ferry) connects Greenwich to the wider Sydney network. Dual occupancy is well-established in Greenwich's R3 zones. Minimum lot size for duplex: 550m². Ground conditions (Class M (sandstone ridges) / H–E (river fall)) across Greenwich are well understood by local builders — Buildana's engineering accounts for extremely reactive soil movement.
Duplex feasibility in Lane Cove sits in R2 detached pockets meeting 550m² minimum across Lane Cove proper, Lane Cove North and inland portions of Riverview and Lane Cove West. R3 medium-density along Burns Bay Road and Longueville Road permits attached duplex — most sites already developed as apartments though. Crows Nest Metro 2024 SEPP TOD precinct in Lane Cove North redirects density to higher-form redevelopment. End values $2.5M–$4.5M per attached dwelling. Heritage Conservation Areas effectively rule out duplex on Greenwich, Longueville, Northwood, Linley Point. Mandatory paid feasibility — site selection determines everything.
Planning Controls — Lane Cove Council
Lane Cove LEP 2009 & Lane Cove DCP 2010. R2 Low Density dominates the LGA: FSR 0.5:1, building height 9.5m, front setback 7.5–9m varying by streetscape, landscaped area 35–40%. R3 Medium Density along Burns Bay Road, Longueville Road and the Lane Cove village core permits FSR up to 0.8:1. R4 High Density and B4 Mixed Use along the St Leonards / Crows Nest fringe in Lane Cove North. The 2024 Crows Nest Metro SEPP TOD precinct overlay reaches the south-eastern portion of Lane Cove North, opening density bonuses inside 400m of Crows Nest Metro station. Heritage Conservation Areas cover most older streets in Greenwich, Longueville, Northwood, Linley Point, Lane Cove West, Riverview and parts of Lane Cove village. Tree Preservation Order applies LGA-wide. River-fall and harbour-fall sites on the Lane Cove River and Sydney Harbour peninsulas (Greenwich, Longueville, Northwood, Linley Point) require engineered slab and retaining design — sandstone rock excavation $20K–$60K standard. Lane Cove National Park frontage on Lane Cove West and Riverview adds bushfire BAL ratings on bush-edge lots.
Duplex builder in Greenwich — key facts
- Suburb
- Greenwich, NSW 2065
- Council / LGA
- Lane Cove Council (Lane Cove)
- Primary zoning
- R2 Low Density / R3 Medium (Lane Cove village)
- Typical lot size
- 500–1,200m²
- Soil class
- Class M (sandstone ridges) / H–E (river fall)
- Median house price
- $3.5M–$8.0M
- Home era
- 1880s–1940s heritage
- Typical price range
- $750,000 – $1,500,000+
- Typical timeline
- 14–22 months design to handover
- Approval pathway
- CDC for compliant dual-occupancy, else DA
Building in Greenwich — Local Context
Foundations & Slab Design for Greenwich
Greenwich's ground is extremely reactive clay (Class M (sandstone ridges) / H–E (river fall)). On a 500–1,200m² block, that translates to engineered slab work in the $45,000–$80,000 bracket for a duplex. Double-check any quote that doesn't itemise the slab — 'slab as per engineering' usually means the builder will hit you with a variation once the soil report comes back. We commission the geotech upfront, before pricing, so the cost in your contract reflects what your block actually needs. If your neighbour's home shows movement cracks above architraves or below window sills, that's a signal worth knowing before you finalise design — Buildana's site assessment looks at adjacent stock too.
Approval Timeline for Greenwich
Realistic timeline for a duplex in Greenwich: 8–14 weeks for DA through Lane Cove Council. Add 2–4 weeks before lodgement for documentation, BASIX certificate, geotech report, and survey if you don't already have one. Duplex applications in Lane Cove sometimes attract objection during neighbour notification — usually overlooked privacy concerns or boundary fence disputes. We design for that risk upfront. Construction Certificate is issued separately before works commence.
Cost vs Value in Greenwich
Median sale price in Greenwich is $3.5M–$8.0M. For a duplex, the decision tree runs through three numbers: build cost, expected post-completion value, and how long you plan to hold. Duplex builds in Lane Cove cost $750K–$1.5M total and typically sell at $1.35M–$1.85M per dwelling — net margin sits in the $200K–$500K range after holding costs and contributions, depending on Torrens vs strata title. We map this in feasibility before you commit.
Greenwich Housing Stock & What That Means
Most homes in Greenwich were built 1880s–1940s heritage. That puts asbestos risk firmly in play — sheeting, eaves linings, vinyl floor tiles, and pipe lagging are likely. Licensed removal adds $5,000–$25,000 to a duplex where demolition is involved, and Buildana manages SafeWork NSW notifications, removal, and clearance certificates as part of the contract.
Building Activity in Greenwich Right Now
Greenwich is seeing steady residential activity — the July 2024 R2 duplex reform opened up dozens of blocks across the suburb that previously couldn't develop, and Lane Cove Council is processing dual occupancy DAs at a higher volume than at any point in the last decade. Buildana sits inside that pipeline — we know what's getting approved, what's stalling, and why.
Builder's Take on Greenwich
The real edge on Greenwich duplex projects is sequencing. Two slabs on one pour, two frames standing up the same week, two sets of trades rolling in convoy. If each dwelling is treated as a separate build, the programme blows out by 8–12 weeks. We build them as one job.
On a duplex, the acoustic party wall is where corners get cut. In Greenwich, where the suburbs are getting denser, bad acoustic separation between dwellings kills resale. NCC Vol 2 Part 2.7 mandates Rw 50 — Buildana builds to Rw 55 as standard, with staggered studs and mass-loaded vinyl.
Greenwich vs Nearby Suburbs
Greenwich vs nearby suburbs — key metrics for building a duplex.
| Suburb | Median Price | Typical Lot | Soil Class | Min Duplex Lot | Station |
|---|---|---|---|---|---|
| Greenwich2065this suburb | $3.5M–$8.0M | 500–1,200m² | Class M (sandstone ridges) / H–E (river fall) | 550m² | Wollstonecraft (1.5 km, ferry) |
| Wollstonecraft2065 | $2.8M–$4.5M | 400–700m² | Class M (sandstone) / H–E (Gore Cove fall) | 500m² | Wollstonecraft |
| Northwood2066 | $4.0M–$8.0M | 600–1,400m² | Class M (sandstone ridges) / H–E (river fall) | 550m² | Wollstonecraft (3 km, ferry from Longueville) |
| St Leonards2065 | $2.2M–$3.2M | 350–600m² | Class M (ridges) / H to E (Middle Harbour valleys) | 650m² | St Leonards |
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.
Have a question about your project?
Talk to our team — free site assessment and fixed-price quote.
How It Works
From First Call to Final Key
We assess your Greenwich block — lot size (typical 500–1,200m²), width, R2 Low Density / R3 Medium (Lane Cove village) zoning, setbacks, FSR, landscaped area requirements under Lane Cove Council's LEP and DCP. Minimum lot for duplex: 550m².
⏱Design phase covers unit layout, access, parking, private open space, and waste management for dual occupancy on your Greenwich site. You approve final plans before we move to lodgement.
⏱Duplex approvals get scrutinised harder than single dwellings — neighbour notification, overshadowing, privacy, traffic, waste. Our SEE addresses each on the front foot rather than reactively.
⏱Fixed-price construction of both dwellings from slab to keys. Class M (sandstone ridges) / H–E (river fall) engineered footings, frame, lock-up, internal fit-out, and external works.
⏱Subdivision registration starts in parallel with final fitout so titles issue close to handover, not 6 months after. Buildana coordinates the surveyor and Lane Cove Council clearance — important if you're planning to sell one side immediately to fund the next move.
⏱Quality Promise
Greenwich dual occupancy construction: feasibility assessment first, then fixed-price build to dual handover. No surprises.
Cost Guide
| Item | Estimated Range |
|---|---|
| Vacant R2/R3 block in Greenwich — duplex build | $960,000 – $1,920,000 |
| KDR duplex (demo 1880s–1940s heritage home + dual build) | $1,050,000 – $2,050,000 |
| Subdivision-ready block (existing survey & titles) | $960,000 – $1,790,000 |
| Corner block dual-frontage duplex | $1,150,000 – $2,050,000 |
| Investor scenario (neutral-gear focus, rental-ready) | $1,090,000 – $1,600,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
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“Buildana built our granny flat in just 12 weeks. Fast approvals, great communication, and a beautiful final product. Highly recommend.”
Fatima Al-Rashid
Liverpool, NSW
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Last updated: 1 July 2025
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