Dual Occupancy Specialists North Kellyville — Licensed Duplex Builder
NSW licensed duplex builder in North Kellyville 2155. Torrens or strata subdivision, The Hills Shire Council planning expertise, full contract management for investor-grade builds.
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A duplex in North Kellyville costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, The Hills Shire Council approvals, construction and subdivision under one fixed-price contract.
North Kellyville Dual Occ. — Feasibility to Handover
Duplex in North Kellyville works 600m²+ R2 lots in the larger 2010s+ release pockets. Wianamatta Shale. End values $1.4M–$1.9M per attached dwelling.
Most North Kellyville blocks run 350–650m² on Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) ground. Duplex feasibility hinges on lot size (600m² (R2) / 700m² preferred under Hills DCP minimum under The Hills Shire Council), frontage width, and whether your block sits inside any overlay — flood, heritage, biodiversity. Worth assessing before design spend. Median price band: $1.4M–$1.9M. Nearest rail is Bus to Kellyville Metro (3 km).
Buildana manages the full duplex development process in North Kellyville — 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 North Kellyville from $750K
- The Hills Shire Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² (R2) / 700m² preferred under Hills DCP in North Kellyville
- Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) soil — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Bus to Kellyville Metro (3 km) 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 North Kellyville?
North Kellyville is the 2010s+ master-planned new-release suburb — 350–650m² R2 lots, contemporary brick and rendered, Box Hill growth-corridor adjacent. Wianamatta Shale soil. Strong young-family demand.
North Kellyville's rural-residential character and 350–650m² blocks set it apart from standard suburban development. R2 Low / RU2 Rural Landscape (acreage belt) / R1/R3 (Sydney Metro Northwest precincts) zoning means different controls apply — larger setbacks, on-site services, and site-specific engineering. Transport access via Bus to Kellyville Metro (3 km) connects North Kellyville to the wider Sydney network. Dual occupancy is well-established in North Kellyville's R3 zones. Minimum lot size for duplex: 600m² (R2) / 700m² preferred under Hills DCP. Soil conditions in North Kellyville (Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt), moderately to highly reactive) are factored into every Buildana foundation design.
Duplex feasibility in The Hills is among Sydney's strongest mid-tier markets — large R2 lots routinely exceed the Hills DCP 600m² minimum (700m² preferred) opening up vast pools of duplex stock across Baulkham Hills, Castle Hill, Beaumont Hills, Winston Hills, North Rocks, Kellyville (older sections), parts of Bella Vista and West Pennant Hills. R3 along station precincts (Castle Hill, Bella Vista, Norwest, Kellyville, Rouse Hill on Sydney Metro Northwest) and Old Northern Road permits attached duplex with stronger end-value yield. RU2 acreage zoning on the rural west generally restricts subdivision/duplex. End values $1.5M–$2.2M per attached dwelling on inland mid-tier (Baulkham Hills, Winston Hills, North Rocks); $1.8M–$2.6M on Castle Hill, Beaumont Hills, Kellyville; $2.2M–$3.2M+ on Bella Vista, West Pennant Hills, parts of Glenhaven. Wianamatta Shale soil predominant. Bushfire overlays drive specs on bushfire-prone lots. Tree Preservation Order strict — AS4970 root-zone protection plans routine on protected canopy trees. Mandatory paid feasibility — Hills DCP setback, FSR and landscaped-area controls are tighter than the typical 600m² standard.
Planning Controls — The Hills Shire Council
The Hills LEP 2019 & The Hills DCP. The Hills is the largest LGA in Greater Sydney by area — spanning suburban core, North-West Growth Centre release land, and the rural acreage belt to the north. R2 Low Density covers established suburban streets: FSR 0.5–0.55:1, building height 9m, front setback 6–9m, landscaped area 45–60%. R3 Medium Density along station precincts (Castle Hill, Bella Vista, Norwest, Kellyville, Rouse Hill on the Sydney Metro Northwest line), Old Northern Road and town centres permits FSR up to 0.9:1. R4 High Density and B4 Mixed Use concentrated on Norwest Business Park, Castle Towers/Castle Hill Metro precinct, Bella Vista station precinct, Rouse Hill Town Centre and Kellyville station precinct. Hills DCP enforces 600m² R2 dual-occupancy minimum (700m² preferred for premium duplex outcomes). RU2 Rural Landscape covers the acreage belt — Annangrove, Kenthurst, Maraylya, Middle Dural, South Maroota, Cattai, parts of Glenhaven and Nelson — restricting subdivision to 2ha+ minimum and limiting secondary dwellings. Heritage Conservation Areas in pockets covering Castle Hill Showgrounds, Bella Vista Farm, Rouse Hill House and Farm (state-significant), parts of Baulkham Hills heritage cottages and Old Castle Hill Road. Tree Preservation Order LGA-wide and strict — significant remnant bushland on Castle Hill, West Pennant Hills, Glenhaven and the rural west. Wianamatta Shale soil predominant on the suburban core (Baulkham Hills, Castle Hill, Bella Vista, Kellyville, Rouse Hill, Beaumont Hills, Winston Hills, North Rocks, Box Hill, Kellyville Ridge, North Kellyville); Hawkesbury Sandstone soil on the rural west and acreage belt (Annangrove, Kenthurst, Glenhaven, Maraylya, Middle Dural, South Maroota, Cattai, parts of West Pennant Hills) — sandstone rock excavation $25K–$70K on basement/footing scopes. Bushfire-prone land overlays are LGA-defining on the rural west — BAL ratings BAL-12.5 to BAL-FZ on Annangrove, Kenthurst, Glenhaven (parts), Maraylya, Middle Dural, South Maroota, Cattai, parts of Box Hill and Nelson — drive specs (BAL-29 minimum on most acreage; non-combustible cladding, ember-screened openings, sprinklered eaves on BAL-FZ). Asset Protection Zone (APZ) requirements 10–40m+ reshape siting on bushfire-prone parcels. Sydney Water sewer connection extends across the suburban core but the rural acreage belt runs on-site sewer treatment (AWTS) under Council/NSW Health protocols. Riparian setbacks 20–60m on Cattai Creek, Cattai Creek tributaries and Hawkesbury River foreshore (South Maroota, Cattai). The Sydney Metro Northwest line (Tallawong–Chatswood) is the LGA-defining infrastructure event of the past decade, anchoring the R3/R4 redevelopment corridor through Bella Vista, Norwest, Castle Hill, Kellyville and Rouse Hill stations. The North-West Growth Centre at Box Hill, Nelson and the eastern fringe of Rouse Hill is the active master-planned new-release frontier under Department of Planning controls. Norwest Business Park anchors LGA employment and drives R3/R4 apartment demand. Hills T-Way bus corridor and M2 Motorway define the southern transport spine.
Duplex builder in North Kellyville — key facts
- Suburb
- North Kellyville, NSW 2155
- Council / LGA
- The Hills Shire Council (The Hills)
- Primary zoning
- R2 Low / RU2 Rural Landscape (acreage belt) / R1/R3 (Sydney Metro Northwest precincts)
- Typical lot size
- 350–650m²
- Soil class
- Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt)
- Median house price
- $1.4M–$1.9M
- Home era
- 2010s+ contemporary
- 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 North Kellyville — Local Context
Ground Conditions That Affect Your Build
Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) is the rule across North Kellyville — moderately to highly reactive clay. For your duplex development, expect engineered footings in the $24,000–$42,000 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. North Kellyville is close to Bus to Kellyville Metro (3 km) station — site access on tighter blocks adds a logistics premium, which is why we cost cranage and material delivery before signing, not after.
The Hills Shire Council & Approval Pathway
North Kellyville sits inside the The Hills LGA, governed by The Hills Shire Council. For a duplex development, the approval question is usually CDC vs DA. Duplexs in North Kellyville usually need a full DA through The Hills Shire Council — typically 40–90+ days from lodgement, longer if neighbour notification triggers objections. Either way, we manage submission, RFIs, and re-lodgement in-house — you don't deal with the council.
North Kellyville Build Economics
North Kellyville sits in the $1.4M–$1.9M price band, which is the framing for any duplex development decision. On a 350–650m² block here, the build-versus-buy maths usually favours dual occupancy where the lot meets 600m² (R2) / 700m² preferred under Hills DCP minimum and zoning allows. Free Buildana feasibility runs the numbers against your actual block before any commitment.
North Kellyville Housing Stock & What That Means
Most homes in North Kellyville were built 2010s+ contemporary. Modern homes in this era generally have no asbestos, though survey is still standard before any major works.
Realistic North Kellyville Timeline
End-to-end timeline for a duplex development in North Kellyville, lodgement-realistic: 8-14 weeks for DA, depending on neighbour notification and any RFI rounds. Add 2-3 weeks for documentation pack assembly before lodgement (BASIX, geotech for Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt), contour survey, hydraulic). Add 1 week for Construction Certificate post-approval. Construction itself runs 9-14 months once you're on the ground. Buildana provides a dated programme in every contract, not a vague "12-18 months" range.
Builder's Take on North Kellyville
Rental yield analysis for North Kellyville: attached duplexes typically rent about 95% of what a detached would — the cost saving on construction (roughly $200K–$300K less than detached) usually outweighs the rental difference. For investors, attached is almost always the better play unless the land premium supports detached.
Council contributions in The Hills Shire Council can run $10K–$60K for a duplex depending on dwelling size and site. These aren't always obvious up front. Buildana flags the contribution estimate during feasibility so your project budget isn't short on line 47 of the DA conditions.
North Kellyville vs Nearby Suburbs
North Kellyville vs nearby suburbs — key metrics for building a duplex.
| Suburb | Median Price | Typical Lot | Soil Class | Min Duplex Lot | Station |
|---|---|---|---|---|---|
| North Kellyville2155this suburb | $1.4M–$1.9M | 350–650m² | Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) | 600m² (R2) / 700m² preferred under Hills DCP | Bus to Kellyville Metro (3 km) |
| Kellyville2155 | $1.8M–$2.6M | 500–800m² | Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) | 600m² (R2) / 700m² preferred under Hills DCP | Kellyville (Sydney Metro Northwest, in suburb) |
| Rouse Hill2155 | $1.4M–$2.0M | 350–650m² | Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) | 600m² (R2) / 700m² preferred under Hills DCP | Rouse Hill (Sydney Metro Northwest, in suburb) |
| Beaumont Hills2155 | $1.7M–$2.5M | 500–800m² | Class M (Wianamatta Shale, suburban core) / H (Hawkesbury Sandstone, rural west + acreage belt) | 600m² (R2) / 700m² preferred under Hills DCP | Bus to Rouse Hill Metro (3 km) |
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
Everything that has to be right before we touch the ground. Feasibility covers the planning side and the financial side. Yes-or-no on whether the block supports dual occupancy under The Hills Shire Council controls, plus indicative end values, build cost, and likely yield. The point is to kill bad sites before you spend on design — not after. Dual occupancy floor plans designed for your North Kellyville block — attached or detached configuration, vehicle access, private open space, and full The Hills Shire Council compliance.
⏱The North Kellyville construction phase. Fixed price, programmed, supervised. Full approval management: Statement of Environmental Effects, plans, reports, and all supporting documentation lodged with The Hills Shire Council or private certifier. We handle RFIs and conditions. CC follows. Construction follows a tight programme: dual slabs in one mobilisation, paired frame stand, simultaneous lock-up, then trades rotate between sides for fit-out so no day is lost waiting on availability. The schedule is engineered, not optimistic.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Both dwellings handed over with individual Occupation Certificates. Subdivision lodged for separate titles. Separate metering installed. 6-year structural warranty per dwelling.
⏱Quality Promise
Every Buildana duplex in North Kellyville is built under a fixed-price contract — feasibility through to dual handover and subdivision.
Cost Guide
| Item | Estimated Range |
|---|---|
| Attached duplex (2 × 180–220m²) | $770,000 – $1,020,000 |
| Attached duplex (2 × 220–260m²) | $1,020,000 – $1,330,000 |
| Detached duplex (2 × 220–280m²) | $1,220,000 – $1,580,000 |
| Strata/Torrens subdivision | $15,000 – $31,000 |
| Demolition (if KDR duplex) | $18,000 – $41,000 |
| Council contributions | $10,000 – $61,000+ |
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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Last updated: 1 July 2025
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