Duplex Designs

A Duplex design & development, allows for a single titled lot to be split into two independent titles (Lot 1 & Lot 2). There are three main types of (Land separated) duplex styles, - 1) Traditional house behind a house style, 2) Side by side duplex and 3) Corner lot style. 95% of the designs we create for our clients are customised specifically to the lot shape, Shire requirements and our customers expectations and budget! If your serious about building a Duplex Development, it is critical we run a true feasibility of costs and show the appropriate design options.

Traditional Duplex Designs

If you have a standard shaped block, a traditional duplex development may be your best option! A lot of councils are now limiting the number of driveways coming off standard lot shapes and forcing our designs to have only one council crossover or not allowing side by side developments. This type of design is essentially a new house behind a new house.

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Side by Side Duplex Designs

Side by side duplex designs are very poplar where one wants a more traditional family layout. The designs are based off narrow style designs and typically range from 8 meters to 12 meters in width. This helps the homes reach better resale, by offering their own street frontage to the main road.

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Corner Block Duplex Designs

With WA State R-Code amendments and recent council policy changes, most corner lots through out the Perth Metro area are now eligible to build two homes. Unfortunately, Corner Lot Duplex Designs cannot be built from standard residential style plans. These designs are shaped to meet specific strata and council policy. 99% of the time, they will be customised to your block.

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As a general guide the lower end of a duplex development can start as little as$480,000. The typical costs that we see throughout the Perth metropolitan area range from $550,000 (basic) to $750,000 (premium) for a single-storey duplex development. Double-storey typically starts at around $770,000. With one phone call, we can work out through our comprehensive feasibility study, a breakdown of all incremental costs. With this information, you can take it to your accountant or finance broker. Plus we have dozens of case studies we can run through!

Including the initial feasibility study and design consultation, council submissions, colour selections and physical construction a single storey duplex development we would recommend allowing 11 to 14 months. Depending on the quality of planning application to the council will have a large impact on time frames. The quickest times we have seen is just under 12 months. If you are considering a double story duplex development, inclusive of initial feasibility study and design consultation we would suggest to allow around 18 months. *Please note, every planning application will take a different period of time depending on the number of concessions requested.

Building any new home does have thousands of items that need to be checked and cross checked. Our free feasibility study, is designed to check and tick off all grey costs. We are 99% confident in the information we deliver to our clients. Call us for an obligation-free feasibility on your block!

There are two main types of duplex developments created in Perth, survey Strata and built Strata developments. A survey Strata development involves an application to the West Australian planning commission whereby two independent titles can be created where the legal boundary is a round the outside perimeter fence line. the negative of doing a survey Strata application is it takes approximately 7 to 12 months to create the two physical titles. With banking regulations tightening it is not uncommon that lenders prefer to see the two titles first, before they hand over the money for the physical construction.

A Built Strata development can be applied for via the builders planning application minimising time frames to under 3 months. The remainder of the title creation process can be done during the builders physical construction. Because of the time frames and easier administration for the client, typically a built Strata is the preferred choice of development.

Once we sit down and look at your block, we can advise correctly on the type and time frames.

Absolutely we offer and obligation free over the phone feasibility of your block and an obligation-free meeting to get together to discuss your ideas. We guarantee if you are not better informed about your duplex development you can bill us for your time.

Call us to organise a get together! Our office is based in Osborne Park, or we can pop out to your home.

Dual Income Plus is an independent design and building consultant company. Because of the volume of work that we do, we can either use many top 10 and top 20 builders that would love to design up your duplex or you can sit down with our independent design team so you can then shop your plan to any builder you wish. Before selecting a builder and designer specific to your project we look at your expectations, your budget and ideas and will then recommend the best options. This is far better than walking into a builders office with no idea about expectations or delivery of design or delivery of the physical product. Our job is to know the end result before we make the professional recommendation.

Yes because we are independent we have over 25 professional Perth designers who specialise in some way in duplex plans. By using an independent designer you're able to achieve a licence to use that plan once (shop the plan around). Our job is to ensure we do not over-run your budget and we are designing to the council and block parameters!

Through obtaining dozens of quotations from many top Perth builders, we have compared the price, the specification, and the quality of construction several times over. When you build you may only do it once every two to five or 15 years. We are doing this every single day and we are constantly comparing and looking for the best price and the best specification to make sure our clients attain the best results. We deal direct with the Owners, General Manager or Sales Manager so there is guaranteed no secondary commissions. Our fee for service is paid by the builders standard sales commission structure. Because we are aware of the best priced builders in Perth, we are typically obtaining $5,000, to as much as $80,000 of genuine savings! We have real life case studies to prove this!

Corner Block - Buying a corner block of land near a main intersection may have access constraints. If there is a set of traffic lights or a non mountable traffic island in the middle of the road, there may be situations where the driveway position is limited to one location only.

Sewer Pipe Location - When buying a traditional duplex block, one of the most important things to consider is where the sewer pipe is travelling underground. This is commonly referred to as an easement which is effectively a no build area.

Zoning - Zoning is the number of dwellings allowable per square metres of the building site. This can easily be checked by visiting the local councils mapping system.

Old Swimming pools and Septic systems - Old septic systems or swimming pools would be one of the larger headaches involved when building a duplex development. From extensive experience our advice with all swimming pools is to actually leave the shell of the pool in the ground, but the first 600mm of the edge of the pool needs to be cut out. Doing this will not disturb the foundations further. The area is then filled with clean building sand and compacted in layers of 300mm at a time or as an engineer sees fit. A septic system will need to be partially removed. The top of the septic system will need to be taken away and disposed of and again compacted in 300mm layers. It is important to get a certificate or receipt from the plumber and earth-worker confirming that this work has been done to a standard (set out by an engineer) as this is commonly a written requirement by most councils and the West Australian planning commission.

Dual Income Plus Suite 4, 136 Stirling Highway North Fremantle (Perth) Western Australia

Phone (08) 9442 9999