Licensed Duplex and Granny Flat Builders
Unlocking land potential through turnkey construction of custom duplexes, dual occupancies, attached extensions, and council-approved secondary dwelling granny flats.
Specialized Capabilities and Proven Craftsmanship
Every stage executed by trade-certified specialists adhering to Australian building standards.
Dual-Occupancy Duplexes
Side-by-side or stacked duplex developments maximizing rental return and capital growth.
Detached Granny Flats
Turnkey 60m2 secondary dwellings built to NCC standards with full kitchens and bathrooms.
Attached Secondary Suites
Integrated multi-generational wings with private entrances and independent living quarters.
Fast-Track CDC Approvals
20-day planning sign-off under the State Environmental Planning Policy (SEPP Housing).
Precision Engineering and Architectural Detailing
Built with uncompromising structural integrity, premium materials, and obsessive attention to detail.
We eliminate trade shortcuts. Our project directors oversee every dimensional cut, substrate preparation, and finishing detail, guaranteeing that your space delivers luxury aesthetics and long-term durability.
Australian Standards and Code Compliance
Certified compliance across national construction codes and trade manufacturing benchmarks.
Statutory Builder Warranties
Covered by mandatory 6-year structural and 2-year non-structural statutory warranties backed by the Home Building Act and HBCF insurance.
Rigorous Tolerance Controls
All installations adhere to the NSW Guide to Standards and Tolerances, ensuring laser-straight junctions, plumb walls, and uniform joint gaps.
Master Builders Membership
Proud active members of the Master Builders Association, upholding the highest standards of professional conduct, safety, and trade ethics.
Our Streamlined Five-Stage Delivery Methodology
A seamless, disciplined construction journey keeping your project on time and within scope.
Feasibility & Site Assessment
Checking block frontage, setbacks, sewer mains, easements, and planning zoning.
Architectural Design & CDC
Drafting floor plans, engineering computations, and fast-track private certifier submission.
Groundworks & Slab Pour
Site excavation, civil drainage trenches, moisture barriers, and engineered slab concrete.
Framing & Lockup Stage
Erecting AS 1684 timber framing, fire-rated party walls, brickwork, roofing, and windows.
Fitout & Occupation Certificate
Interior joinery, painting, tiling, utility metering connections, and final OC handover.
Advanced Substrate Preparation and Execution
Constructing certified acoustic and fire-rated dividing walls between dual-occupancy dwellings.
We construct twin-stud or shaft-liner fire separating walls achieving Rw+Ctr 50+ acoustic privacy, exceeding National Construction Code mandates and protecting privacy between occupants.
- 60/60/60 Fire Resistance Level (FRL) Compliance
- Independent Twin-Stud Structural Framing Separation
- High-Density Soundproofing Insulation Batts
- Fire-Sealed Acoustic Penetration Collars on Services
Fast Track Council Approvals Management
We manage the complete approval pathway, whether Complying Development (CDC) under NSW Low Rise Housing Diversity Code or standard council Development Application (DA), delivering an Occupation Certificate ready for tenants.
Frequently Asked Service Questions Answered
Clear, honest advice regarding project scheduling, approvals, and material warranties.
What is the minimum lot size required for a granny flat in NSW?
Under the NSW State Environmental Planning Policy (Housing), detached secondary dwellings generally require a minimum lot size of 450m2, with a maximum floor area of 60m2 for the secondary home.
Can duplexes be approved through Complying Development (CDC)?
Yes. Under the Low Rise Housing Diversity Code, compliant duplex projects can bypass lengthy council DA queues and receive approval via CDC within 20 business days.
How are electricity and water separately metered?
We coordinate with energy distributors and water utilities to install dedicated sub-meters or separate utility connections, allowing distinct tenant utility billing.
Do you manage the entire project from planning to keys?
Yes. AR Developments Group operates as a turnkey builder, managing architectural drafting, engineering, certifier approvals, slab preparation, framing, fitouts, and final Occupation Certificates (OC).
Complementary Building and Renovation Services
Enhance your property by pairing this service with our licensed residential construction offerings.
Structural Carpentry & Framing
Precision structural framing and roof truss erection.
Certified Wet Area Waterproofing
Protecting dual occupancy wet areas from inter-floor leaks.
Licensed Construction Supervisory Audits
Independent stage inspections from footings to lockup.
Master Bespoke Kitchen Renovations
Turnkey custom kitchen joinery for duplex properties.
Active Regional Coverage and Dispatch
Operating across key Australian metropolitan and regional territories with certified site supervisors.
New South Wales
Sydney Metro, Hills District, Parramatta, Wollongong & Central Coast.
Licensed NSW Building TeamQueensland
Greater Brisbane, Gold Coast, Moreton Bay & Sunshine Coast.
Certified QLD Building TeamAustralian Capital
Canberra Central, Belconnen, Gungahlin, Woden & Tuggeranong.
Accredited ACT Building TeamSouth Australia
Adelaide Metropolitan, Adelaide Hills, Norwood & Coastal Hubs.
Master SA Building TeamStart Your Next Building Consultation
Connect with our licensed building directors for an honest site assessment, engineering feasibility, and detailed scope of work.