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Provincial Homes designs and builds duplex homes across Sydney, with single-storey and double-storey floor plans in 3- and 4-bedroom configurations, suited to blocks about 12.4 metres wide. Our duplex designs give you two separate dwellings on one title: live in one and rent the other, sell one to fund the build, or keep the family close with multi-generational living.
Backed by 35 years as builders in Sydney and a 30-year structural guarantee, every duplex home design can be customised to your block, your budget and your brief.
Explore Our Duplex Designs
Provincial Homes offers a wide range of duplex house designs in Sydney, and every home design in the range starts as a proven floor plan that can be customised to your block and your brief.
The range spans 3- and 4-bedroom configurations, single-storey and double-storey layouts, and dedicated corner-block designs, on lot widths from about 12.4 metres to 15.2 metres. Every duplex should feel like two dream homes, not two identical boxes on one block.
One design worth seeing in person is the Sandringham 53, a double-storey duplex now on display at HomeWorld Box Hill. Walk through it before you commit to a home design on paper.
Single Storey or Double Storey Duplex Design, Which Suits Your Block?
Block width and depth usually decide whether a single-storey or double-storey duplex design suits your site better. Narrow or deep blocks tend to push the design upward, while wider blocks open up a single-storey option. The table below breaks down where each format works best.
A single-storey duplex keeps both dwellings at ground level, which suits downsizers, accessibility needs, and multi-generational living where stairs are a genuine obstacle, and it keeps more of the block as a usable yard.
A double-storey duplex trades some yard space for extra bedrooms and living area on the same footprint, which is why investors seeking rental income and growing families are most likely to choose it. Double-storey duplex designs in the Provincial Homes range include the Sandringham 53, Marcellin 49 and Eastwood 48.
Whichever format fits your block, every duplex home design in Sydney from Provincial Homes can be adjusted during selections, so the choice is about the site, not a limitation of the design.
Duplex Designs by Block Width
| Block width | Wider blocks suit it better | Works on narrower frontages |
| Living space per dwelling | Limited by block footprint | More bedrooms and living areas on the same footprint |
| Best for | Downsizers, accessibility, multi-generational living where stairs are an issue | Investors maximising bedrooms and rental income, growing families |
| Yard retained | Less | More |
| Typical Provincial designs | [Note for client: Confirm sample designs] | Sandringham 53, Marcellin 49, Eastwood 48 |
What Affects the Cost of Building a Duplex in Sydney
There is no single price for a duplex in Sydney: two identical designs on different blocks can differ by six figures once you factor in site conditions, council contributions, and finishes. The number only means something when priced against your actual site, which is why Provincial Homes quotes per block rather than publishing a flat rate.
Here is what moves the number most:
Design size and configuration
Two 3-bedroom dwellings cost less than two 4-bedroom dwellings, and every duplex carries two kitchens, two sets of bathrooms and separate meters.
Single-storey versus double-storey
The slab area, roof area and stair construction that come with a second storey.
Site conditions
Slope, reactive clay, rock, tree removal and any engineered footings the site requires.
Demolition and asbestos
Relevant if the project is a knockdown rebuild of an existing house.
Council contributions
This will vary by local government area across Sydney, and no two councils charge the same amount.
Approval pathway
A complying development certificate versus a full development application, which affects both timeline and cost.
Torrens title subdivision
An additional cost if the plan is to sell the two dwellings separately.
Selections and upgrades
The finishes and inclusions chosen in Your Style Studio.
Book a Free Site Inspection for Your Duplex
The only accurate duplex quote is one written for your block. Book a FREE site inspection, and we will assess your site, confirm what your council allows, and prepare a fixed quotation at no cost.
Where We Build Duplexes Across Sydney
As duplex builders in Sydney, our current build areas include:
- Northern Sydney: Manly, Willoughby, Lane Cove, Hunters Hill and the Northern Beaches.
- Inner West and inner city: Canada Bay, Strathfield, Burwood, Leichhardt and Marrickville.
- Eastern and southern Sydney: Randwick, Botany Bay, Bayside, Georges River and Sutherland.
- Beyond the metro: Central Coast (Gosford, Wyong), Hawkesbury, Blue Mountains and Wollondilly.
Does your block qualify for a duplex?
Under the NSW complying development pathway, a dual occupancy generally needs a lot of around 400 square metres with a frontage of at least 12 metres. However, many Sydney councils set higher minimums in their own local environmental plan and development control plan, commonly 500 to 600 square metres and 15 metres of frontage. The Low Rise Housing Diversity Code sets the statewide baseline, but your council can require more.
The only way to know for certain is a site assessment against your council’s actual controls, which is exactly what we check as part of your free site inspection. For the complete list of suburbs and postcodes we cover, see our Where We Build page.
Turn Your Existing Block Into a Duplex With a Knockdown Rebuild
If you already own a block in Sydney, a knockdown rebuild is often the more direct route to a new duplex home than buying elsewhere. You already have the location and the neighbourhood, and in many cases your existing block already supports a dual occupancy under your council’s controls. Demolishing an existing house and rebuilding can also work out cheaper than buying and moving, once you account for stamp duty and the time spent searching for a new site.
We manage demolition, including asbestos removal where it applies, as part of your build program. If your block’s development potential has not yet been assessed, a free site inspection will confirm exactly what your council allows. See our knockdown rebuild page for the process.
Why Sydney Duplex Buyers Choose Provincial Homes
Sydney duplex buyers choose Provincial Homes as their duplex builder for a track record they can check, not just a promise. As modern duplex builders in Sydney, here is what backs it up:
- 35 years of home building in Sydney, marked with our 35 Year Celebration Package for buyers building with us this year.
- A 30-year structural guarantee on every home we build, covering the structural elements long after handover.
- Custom duplex builders in Sydney in practice, not just in name; every duplex design in our range can be modified to fit your block, your bedroom count or your budget.
- Your Style Studio, where you choose colours, finishes and fixtures for both dwellings with one on-site consultation.
- Our Six Star Commitment, the standard we hold every build to from contract to handover.
Want to hear from our past clients? Read their experiences of building with us in our testimonials.
Walk Through a Duplex Display Home at HomeWorld Box Hill
The Sandringham 53 duplex design is on display now at HomeWorld Box Hill, so you can walk through both dwellings before committing to a home design on paper. The display home is open 7 days a week, from 10 am to 5 pm, at Gittel Street, Box Hill NSW 2765. Seeing room sizes, ceiling heights and finishes in person answers questions a brochure cannot, particularly for a duplex where you are really assessing two homes at once.
Call us on 02-9629-5200 to plan your visit, or drop in during opening hours.
Duplex Designs Sydney: Your Questions Answered
1. How much does it cost to build a duplex in Sydney?
There is no fixed price, since two identical duplex designs can cost very differently on two different blocks once site conditions, council contributions and selections are factored in. Design size, storeys, site conditions, and the approval pathway all affect the number.
2. What size block do I need to build a duplex in Sydney?
Under a complying development, a dual occupancy generally needs a lot of around 400 square metres with at least 12 metres of frontage, though many Sydney councils require more, commonly 500 to 600 square metres and 15 metres. A site assessment against your council’s controls confirms whether your block qualifies.
3. Do I need council approval to build a duplex, or can I use a CDC?
Yes, every duplex needs either a complying development certificate (CDC) or a development application (DA). A CDC is the faster path and applies when your site meets every standard requirement outright. A DA goes to council for full assessment when it does not, and takes longer. We handle the lodgement either way.
4. Can I live on one side and rent out the other?
Yes, this is one of the most common ways buyers use a duplex. You live in one dwelling while the rental income from the other helps offset your mortgage, and because the two homes are fully separate, both households keep their own entrance, yard and privacy.
5. Can I sell one half of the duplex separately?
Yes, provided you complete a Torrens title subdivision, which is a separate legal process from the build itself and subject to council approval. It carries its own cost and timeline, so it is worth deciding early whether you plan to keep both dwellings, sell one, or hold both as an investment.
6. Is a duplex a good investment in Sydney?
A duplex can be a strong investment structure because it puts two dwellings on one land holding: two rental incomes, or one rental income offsetting your own mortgage, plus exposure to capital growth on a single block. We keep this factual rather than promising a yield, since that depends on your suburb and finance, not the build itself.
7. Can I build a duplex on a block that already has a house on it?
Yes, via a knockdown rebuild. We demolish the existing house, including asbestos removal where it applies, then build your duplex on the cleared site. Demolition and asbestos removal are cost items to budget for separately from the build itself, and we cover both as part of the project. See our knockdown rebuild page for the process.
8. Can I customise a Provincial Homes duplex design?
Yes. As custom duplex builders in Sydney, every duplex design in our range can be modified to suit your block, bedroom mix or budget. Our Your Style Studio process lets you adjust the floor plan where needed and select colours, finishes and fixtures for both dwellings, so the finished home reflects your brief, not a fixed template.
9. Which suburbs do you build duplexes in?
As duplex builders in Sydney, we work right across the metro area, from Northern Sydney and the Northern Beaches through the Inner West, eastern and southern Sydney, and out to the Central Coast, Hawkesbury, Blue Mountains and Wollondilly. See our Where We Build page for the complete list of suburbs and postcodes we cover.
Book a Free Site Inspection for Your Duplex
Ready to get started? Book your free site inspection, and we’ll assess your block, confirm what can be built under your council’s requirements, and provide a fixed quotation at no cost. Call 02-9629-5200 or complete our contact form, and we’ll be in touch to organise a convenient time.
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