Illustrative scenario in the film: a Melbourne lot at $700,000 plus a $700,000 build, nine rooms at $380 a week fully let. Gross figures, before vacancy, rates, insurance, management, interest and tax; not a forecast for any property.
The land isalready yours.Put a rent on it.
A second home behind the one you own. One team designs it, takes it through permits and builds it for a price fixed in the contract. OptimaRea can then lease and manage it. We build the home; the home builds the cashflow.
The short version
DollarBuild is a Melbourne design-and-build company, formed in 2026, that coordinates granny flat and rooming house design, permits and construction in Melbourne, Sydney, Brisbane, the Gold Coast and Perth; leasing and property management of the finished dwelling are provided by OptimaRea (optimarea.com.au). Six turnkey build offers across the 34, 60, 80 and 300 m² categories — Compact 34, Home 60, Home 80, Home 80 Premium, Home 80 Premium + Garage and the nine-bedroom Rooming House 300 — are each designed to a 7-star NatHERS rating and delivered as a material kit, as prefab modules or as a local build. Published state build prices include GST and paperwork (price book 2026-10-17): Victoria $121,000 to $748,000; Queensland $154,000 to $275,000; New South Wales $154,000 (Compact 34) and $203,500 (Home 60); Western Australia $154,000 and $203,500. The agreed contract price stays fixed throughout the build, and the programme is 4 weeks paperwork, then 3 months construction, with scope, site requirements and the schedule agreed before signing. Start with the address: the free address check and the written feasibility report come before any proposal.
Your address. Your possibilities.
What could you build here?
Start with your address. Compare the site options before committing to a build.
Feasibility reports · valued at $490 eachFree until 30 November 2026. No obligation.
VIC · NSW · QLD · WA. No payment details needed.
Melbourne · Sydney · Brisbane · Gold Coast · Perth · English & Mandarin
Service and product information updated on
What you are buying
Six promises.Each one in writing.
- Fixed priceThe price you sign is the price you pay.
- Built to earn rent$500 a week is the rent target for Home 60 in VIC, on a $170,500 build.
- A 100-year structural design lifeA Z275 galvanised steel frame that termites cannot eat.
- Six years of warrantyWritten into the contract, structure to finishes.
- Worry-free leasingOptimaRea leases and manages the finished home.
- Better specificationLine by line against the market leader in your state.
We build cashflow.Here is the arithmetic.
Choose a home and a state. Then move the rent, the rate and the loan. Every figure is worked from the published build price, including GST.
Weekly rent target
Target from the group’s handbook, 1 November 2026
Target rent ÷ build price
$500 × 52 ÷ $170,500
Monthly cashflow, after interest
Interest at 6.5% · Loan at 80%
Change the assumptions
The working
- Paperwork, the first payment
- $15,400
- Building contract
- $155,100
- Build price, including GST
- $170,500
- Loan at 80%
- $124,080
- Interest at 6.5%
- −$672 a month
- Rent at $500 a week
- +$2,167 a month
- Monthly cashflow
- +$1,495
- Cash in: paperwork and deposit
- $46,420
- A year of cashflow ÷ cash in
- 38.6%
Target dated 1 November 2026. Leases on the group’s record (14 November 2026): 32 second dwellings of all sizes, at $270 to $595 a week, median $360. Most are smaller, earlier homes.
An illustration on stated assumptions, not a forecast. A rent shown here is a target: it is not a rent received, an appraisal of your property or a guarantee. Target rent ÷ build price is that ratio and nothing more. It is not a yield on the property, because the land you already own, vacancy, council rates, insurance, management, maintenance, any finance cost beyond the interest shown and tax are all outside it. The loan is an assumption you can change and no lender is implied. Figures are gross and before tax. DollarBuild is a builder, not a licensed financial adviser, tax agent, credit provider or lawyer; take advice on your own position. Price book 2026-10-17.
Choose your size.See what it is built to earn.
Six build offers on one specification, with real floor plans. Choose your state to see the build price, including GST, beside the weekly rent target.

Architectural visualisation. Finishes and landscaping are illustrative; the agreed drawings and written specification define your build.
Home 80
Two bathrooms, flexible bedrooms and a more generous 2.7 m ceiling.
- Bedrooms
- 2 / 3
- Bathrooms
- 2
- Ceiling
- 2.7 m
Turnkey includes paperwork. Site requirements, inclusions and the schedule are agreed before signing. Rent targets are not received rents or a guarantee.
Price book updated
We spend moreon what you cannot see.
Better specification, and about $42,800 less.
A selection of the lines that matter. Compared with a leading Melbourne granny-flat builder from its public website in October 2026: inclusions and price are both from its premium range, 60 m² two-bedroom; GST is not stated and is assumed to be included. Its latest published information prevails. LVL and MGP10 are Bunnings retail prices per metre for 90 × 45 mm on 23 October 2026. Landscaping, site works and connection charges are common market rates, verified by DollarBuild. The extra we spend on the frame and the foundation is DollarBuild’s estimate for a 60 m² home. DollarBuild’s price is the published 60 m² build price for this state, including GST.
One wall.Nine layers.
- 18 mm WPC wall panelWalls and ceilings in Gardenia White
- 289-series galvanised frameThe cavity filled with insulation
- 3Weather barrier membraneWatertight to a 2 m head, flexible to −45 °C
- 427 mm ventilated cavityA rain screen that drains and dries
- 512 mm fibre cement sheetJames Hardie™ Axon™ or upgraded equivalent
- Z275
- 275 g/m² of galvanising
- AS 1397 G350 steel, above the usual residential specification
- 0·0·0·1
- Near-perfect fire indices
- The membrane, tested to AS/NZS 1530.3, where 0 is best
- 100years
- Structural design life
- Galvanised steel: termite-proof and dimensionally stable
An illustration of the wall assembly. The contract specification is final.
Finished.Down to the handles.
Flat white joinery, sintered stone, matte-black hardware. The same monochrome scheme in every home, so nothing dates and nothing clashes with a tenant’s furniture.



Design renders. The finish standard is the one in the contract specification.
Read every line of the specificationWarranty
Handover is not the end.The warranty is in the contract.
- Structure
- Slab, load-bearing walls, roof
- Waterproofing
- Wet-area membrane, shower seals
- Plumbing
- Pipes, joints, drainage
- Electrical
- Wiring, switches, switchboard
- Finishes
- Paint, tiles, hardware
Victoria: the term runs from the date the Occupancy Permit is issued.
Not covered: normal wear such as paint fading and hardware ageing; changes made by the owner; inadequate maintenance; floods, storms and other natural events; termite damage, unless the termite works were non-compliant; materials supplied by the owner. The warranty terms in your contract prevail.
Real projects.Real addresses.
A tight backyard. A live tenancy. A tricky service connection. Read the decisions behind the finished homes, including what needed to change.
- 92
- Project addresses in the founding team’s programme
- 30
- Suburbs
- 32
- Second dwellings with a lease on record
- 3,549
- Site images on the record



These projects were delivered by the founding team through the group’s earlier programme, before DollarBuild was formed in 2026. They are shown as the team’s work, with original site photographs and project accounts.
Counted on 14 November 2026 from the group’s build, contract and leasing records. A project address is one under contract, under construction or complete. A lease is counted only where the leasing record holds one for the second dwelling at that address; their median rent is $360 a week.
Fixed price.In black and white.
- Before we sign
Fixed price
Your agreed contract price stays fixed throughout the build.
Your site. Your plan. Your itemised scope.
- 4weeks
4 weeks paperwork
- Then 3months
3 months construction
We coordinate and supervise
- Granny flats are built by a registered builder on a Master Builders standard contract; your proposal names the practitioner
- Drawings, permits, construction and inspections are managed for you
- Photographs are kept at every key milestone, so progress can be checked at any time
- Handover is checked line by line against the agreed specification
No hidden charges
- The signed price is the delivered price
- A variation arises only if you ask for a customisation
- A permanent Class 1a dwelling (Class 1b for the rooming house), not a relocatable unit
- Designed to 7-star NatHERS and Livable Housing Silver
Scope, site requirements and the schedule are agreed before signing.
Fixed timeline 4 weeks + 3 months
Scope
The boundary is written first.That is why the price can be fixed.
In the contract
- Sewer
- Connected to the existing sewer or easement
- Power
- Cable run from the existing supply, sharing the water trench where possible
- Trenching
- Service trenches dug and backfilled
- Soil
- Excavated soil carted off site
- Clean-up
- Construction waste removed and the site left clean at handover
- Landscaping
- Basic landscaping
- Foundation
- Concrete slab to the engineer’s design, in full
Left to you
- Separate meters and NBN
- A separate electricity meter, water meter or NBN connection, if you want one
- Appliances a tenant brings
- Fridge, washing machine, dishwasher and modem
One price
All in.
Everything the site needs is inside the fixed price.
Connections, trenching, soil removal, clean-up, landscaping and the slab are written into the fixed-price contract. The only things left to you are the two listed here.
The fixed-price contract and its schedules are the final scope.
Check what a quote should includeA clear process.Not a day wasted.
Choose the home you want. We bring the people, the documents and the delivery together around your address.
Design
Start with your address. Compare layouts and explore the options for your site.
Permits
Coordinate the drawings, engineering and approval documents for the agreed proposal.
Build
Deliver the agreed scope with the Australian building partner and licensed local trades.
Lease
OptimaRea prepares the finished home for the rental market, starting with a property-specific appraisal.
Manage
OptimaRea provides tenancy and property management after the keys are handed over.
Settle and approve in parallel
For buyers part-way through a purchase
- Day 1
Unconditional
The purchase contract is exchanged
- Day 2
Paperwork starts
Design and approvals run together
First payment: paperwork, $15,400
- Settlement
Keys in hand
The approvals are already done
- Next day
Building contract signed
Construction begins
Second payment: 5% of the building contract
- 3 months later
Complete and rent-ready
Ready for its first lease
Every approval is completed inside the settlement window. Keys one day, building contract the next, a home ready to rent three months later.
Example timelines on the standard programme of 4 weeks paperwork, then 3 months construction. Settlement periods differ and the milestones for your project are set in your proposal.
Worry-free.After the keys.
OptimaRea, the group’s property management business, leases and manages the finished home. When something needs fixing, the property manager, the tenant and the builder sort it out between them.
Repairs go through the manager
If the granny flat needs a repair, the property manager deals with the tenant directly.
The builder is sent under warranty
An issue inside the warranty goes straight to the builder, booked in with the tenant.
Claims are pursued for you
If the tenant is found responsible, the claim is pursued on your behalf.
Leasing and property management byOptimaReaoptimarea.com.au
DollarBuild designs and builds; it is not a real estate agency. OptimaRea’s leasing and management services, fees and the agent responsible are confirmed in writing with OptimaRea. Rent depends on the property and market.

Delivery imagery is illustrative. The method is selected for the project.
How it comes together
One home.The right way to build it.
40 lines.Nothing left to guess.
The standard inclusions for the 34, 60 and 80 m² homes, as published in the handbook. Queensland homes sit on a raised steel subfloor; every other state on a concrete slab.
Structure
- Foundation
- Concrete slab on ground, to the engineer’s design and the soil report
- Frame
- 89-series galvanised steel studs with 90 × 90 mm SHS posts (AS 1397 G350, Z275 coating)
- Floor
- Concrete floor, finished as listed under Floor coverings
- Roof
- Colorbond® concealed-fix steel roofing (BlueScope high-tensile steel, 0.53 mm)
- Gutters
- Colorbond® gutters with a matching downpipe system
Exterior
- Cladding
- James Hardie™ Axon™ or upgraded equivalent: 12 mm fibre cement sheet on 27 × 70 battens, with a 27 mm ventilated cavity behind
- Weather barrier
- 0.5 mm polyolefin breathable membrane, watertight to a 2,000 mm head for two hours, with 50 mm taped laps
- Windows
- Black aluminium frames with double-glazed toughened glass (5 + 12A + 5), specified above the energy report’s requirement; frosted privacy glass in bathrooms
- Flyscreens
- Powder-coated flyscreens to every window
- Entry door
- 920 × 2040 solid-core door in red walnut veneer with a slim vision panel and a matte-black lockset
- Entry
- A 1:10 step-free entry ramp, in concrete or an equivalent steel structure, at no extra cost
Interior
- Walls and ceilings
- 8 mm WPC architectural panels in Gardenia White: seamless, with no plastering or painting; honeycomb-aluminium ceilings in bathrooms
- Wet areas
- SPC waterproof wall panels and 600 × 600 floor tiles (R10 slip rating), with full waterproofing and corner trims
- Floor coverings
- 7 mm SPC hybrid flooring on acoustic underlay throughout; R10 slip-rated tiles in wet areas
- Kitchen
- 16 mm matte-white cabinetry with 1 mm edging, soft-close hinges and runners, matte-black handles, overhead cupboards and a sintered-stone benchtop
- Splashback
- Cut from one full 3200 × 1600 sintered-stone slab
- Sink and tap
- 304 food-grade stainless undermount sink (590 × 450) with a 304 stainless pull-out mixer (WaterMark, WELS 4-star)
- Cooking
- Bosch ceramic cooktop (30 cm in the 34 m² home, 60 cm in the 60 and 80 m² homes), Bosch stainless built-in oven and Bosch 60 cm slide-out rangehood
- Vanity
- Sintered-stone basin on a matte-white vanity (900 × 550), a matte-black mixer and a matte-black framed mirror (750 × 900)
- Shower
- Walk-in, hobless shower to the Livable Housing standard, with a 1530 × 1950 mm black-framed toughened-glass screen and a matte-black rain shower with handheld (WaterMark)
- Toilet
- Back-to-wall close-coupled suite with a soft-close seat, dual flush 4.5 / 3 L
- Laundry
- Washing-machine taps and waste; a separate laundry in the 60 and 80 m² homes
- Robes
- A two-door sliding robe (1650 × 2100) in every bedroom, with a fixed shelf and hanging rail
- Doors and trim
- Hinged doors on timber jambs (820 mm to bedrooms), a moisture-resistant bathroom door, matte-black lever handles, and 66 × 18 mm solid-timber skirting and architraves
Electrical
- Switchboard
- Every power circuit on a 30 mA RCD (AS/NZS 3000), with an Electrical Safety Certificate
- Lighting
- 9 W tri-colour dimmable LED downlights, to the electrical plan
- Power points
- Three GPOs to every room, with matching switch plates
- Data
- One data point in the living room (NBN connection is arranged separately)
- Exhaust fans
- 250 mm fans ducted to outside, 25 L/s or more
- Smoke alarms
- Interconnected 10-year photoelectric smoke alarms (AS 3786) and a 4.5 kg extinguisher
Energy
- Rating
- Designed to 7-star NatHERS; the certificate is issued for the final design on your site
- Insulation
- R2.7 glasswool filling the 90 mm wall frame; R6.0 across the ceiling
- Glazing
- Double-glazed toughened glass, 5 + 12A + 5
- Hot water
- 160 L heat-pump hot water system
- Heating and cooling
- One 2.4 kW reverse-cycle split system
Site and services
- Connections
- Connected to the existing water, power, sewer and stormwater
- Site works
- Site preparation, soil removal and site clean-up; the concrete slab in full
- Landscaping
- Basic landscaping
- Termites
- A galvanised steel frame, which termites cannot eat, plus termite treatment at slab stage
- Colours
- Monochrome: matte-white flat-panel joinery, matte-black hardware, grey-veined white stone and pale grey-washed timber-look floors
By model
Included as standard
- Landscaping
- Basic landscaping
- Concrete slab
- Engineered concrete slab
- Soil removal
- Excavated soil carted off site
- Stone benchtops
- Sintered-stone benchtop and splashback
- Accessibility
- Hobless shower, grab rails, shower seat and a 1:10 entry ramp
- Concealed-fix roof
- No exposed screws, so fewer places for water to get in
Optional
- Fence
- 1.8 m Colorbond® fence at $132 per metre including GST ($120 + GST)
Not included
- Separate meters and NBN
- A separate electricity meter, water meter or NBN connection, where one is wanted
- Appliances a tenant brings
- Fridge, washing machine, dishwasher and modem
- Gas and solar
- No gas connection and no solar system
Standard inclusions for the 34, 60 and 80 m² homes. The schedule attached to your signed fixed-price contract is the final specification; the Rooming House 300 has its own Class 1b schedule. Handbook published .
Make an informed start
The right questions.Before the first drawing.
Prefer the source material?
Victorian rooming house rules & cited sourcesDevelopment questions, answeredAll source-cited guidesWhat does DollarBuild actually do?
DollarBuild is a Melbourne design-and-build company formed in 2026. Its current catalogue includes the 34 m² category with a 34.3 m² one-bedroom plan; 60 m² with two or three bedrooms and one bathroom; standard and Premium 80 m² homes with two or three bedrooms and two bathrooms; Premium 80 m² with a 20 m² enclosed garage in the supplied two-bedroom layout; and a previously built 300 m² nine-bedroom, nine-ensuite rooming-house design. Ceilings are 2.4 m for the 34, 60 and 300 m² categories and 2.7 m across the 80 m² range. Every home is designed to a 7-star NatHERS energy rating, with the certificate issued for the final design on the site. Published state prices include GST and paperwork. Your agreed contract price stays fixed throughout the build. The fixed programme is 4 weeks paperwork, then 3 months construction; scope, site requirements and the schedule are agreed before signing.
Do you publish prices?
Yes. The catalogue publishes turnkey state build prices including paperwork and GST. The agreed contract price stays fixed throughout the build. The fixed programme is 4 weeks paperwork, then 3 months construction; scope, site requirements and the schedule are agreed before signing.
Which delivery method should I choose?
You do not have to choose in advance. Feasibility checks what your site can physically take — crane access, street width, overhead lines, truck access — and what you are optimising for, then recommends one. The product and specification are the same whichever way it is built.
Where do you build?
We quote projects in Melbourne, Sydney, Brisbane, the Gold Coast and Perth, and the catalogue publishes build prices for Victoria, Queensland, New South Wales and Western Australia; a home without a published price in your state is quoted by written proposal. Melbourne comes first, and the founding team has delivered in Brisbane, the Gold Coast and Sydney. Regional Victoria — Geelong, Ballarat, Bendigo — on request.
Who leases and manages the finished dwelling?
Leasing and property management are provided by OptimaRea (optimarea.com.au), the Optima Real Estate group’s Melbourne property management business. DollarBuild designs and builds the dwelling; it is not a real estate agency. If you want OptimaRea to lease and manage the finished home, its services, fees and responsible agent are confirmed in writing with OptimaRea. Rent depends on the property and market and is not guaranteed.
Do I need a planning permit?
It depends on the state, zone and lot. In Victoria, Amendment VC306 (15 October 2026) lets a small second dwelling of up to 80 m² total floor area, measured to the outside of the external walls, be built without a planning permit where the zone conditions are met — in the General Residential Zone, a lot of 300 m² or more, one existing dwelling, no other small second dwelling and no reticulated gas — unless an overlay or title restriction applies. A building permit is always required; since 27 October 2026 the Building Regulations 2018 (version 032, reg 5(4)) also define a small second dwelling as 80 m² or less gross floor area, measured to the outside surface of the external walls, and a building surveyor confirms the measured design. A rooming house has a different pathway. We confirm the project’s approval requirements in writing at feasibility.
Is the material kit compliant in Australia?
The written specification should identify the product evidence required for Australian installation, including relevant WaterMark certification, window and door test evidence, and licensed electrical installation. Confirm the selected products, engineering and building surveyor requirements for your project before procurement; a generic kit description is not a project approval.
Can we work in Mandarin?
Yes. The partners work in both English and Mandarin, and this site is published in both.
How long does a DollarBuild home take to build?
The published programme is 4 weeks paperwork, then 3 months construction, for every catalogue offer from Compact 34 to Rooming House 300. Scope, site requirements and the schedule are agreed before signing, and your agreed contract price stays fixed throughout the build. A lot that needs a planning permit — an overlay, a Queensland council assessment, a site outside the no-permit conditions — has that approval time confirmed in writing at feasibility, before the programme starts.
What is included in the published build price?
Every published price is a turnkey state build price including paperwork and GST: the selected floor plan and documented ceiling height; kitchen, bathrooms and laundry to the agreed scope; frame, roofing, cladding and insulation to the project documentation; glazing, doors, internal finishes and services to the written schedule; engineered foundations and the site works defined in the proposal; and the approvals, inspections and completion documents itemised for the site. Every home is designed to a 7-star NatHERS rating, with the certificate issued for the final design on your site. Site-specific items — demolition, service connections, difficult ground, access — are itemised in the written proposal rather than hidden in the price, and the agreed contract price stays fixed throughout the build.
Can I build a rooming house in Victoria without a planning permit?
Yes, where both limbs of Clause 52.23 of the Victoria Planning Provisions are met. Clause 52.23-2 removes the permit for the use in ten zones and Clause 52.23-3 removes it for the buildings and works in six of them — General Residential, Neighbourhood Residential, Residential Growth, Mixed Use, Township and Housing Choice and Transport — provided the total floor area of all buildings on the land is no more than 300 m² excluding outbuildings, no more than 12 residents are accommodated in no more than 9 bedrooms, every bedroom is reached only from inside the building, shared entry facilities and common areas including a kitchen and a living area are provided, and the minimum garden area is kept in the General and Neighbourhood Residential zones. An overlay, a covenant or a Section 173 agreement can put a permit back. The exemption is planning only: a building permit, the NCC Class 1b classification, a Business Licensing Authority operator licence and council registration all still apply. Rooming House 300 is drawn inside those limits, and the free address check reads the zone, overlays and lot arithmetic of a Victorian address against the same rule pack (verified 2026-09-19).
What is a Class 1b rooming house?
Class 1b is a building classification in the National Construction Code, not a tenancy rule. Under clause A6G2(2)(b) a boarding house, guest house, hostel or the like that would ordinarily accommodate not more than 12 people and has a total area of all floors not more than 300 m², measured over the enclosing walls, is Class 1b — a sub-class of Class 1, designed like a house with two additions the code names: interconnected smoke alarms in every bedroom with lighting to assist evacuation, and access for people with a disability to one bedroom, its ensuite and one of each common room. Cross either number and the building is Class 3 under Volume One. The relevant building surveyor decides the classification and records it on the occupancy permit. Rooming House 300 is drawn single-storey, with nine bedrooms and a 292.05 m² drawing area, so that it sits inside Class 1b and inside the Clause 52.23 planning limits at the same time.
How much does it cost to build a rooming house in Melbourne?
DollarBuild publishes the price. Rooming House 300 — nine bedrooms, nine ensuites, 2.4 m ceilings, 292.05 m² drawing area — has a published Victorian build price of $748,000 including GST and paperwork in the price book dated 2026-10-17: turnkey, with the agreed contract price fixed throughout construction and a programme of 4 weeks paperwork, then 3 months construction. That is about $2,490 per square metre of the nominal 300 m² category. Site-specific items — demolition of an existing house, service connections, ground conditions, access — are itemised in the written proposal for the address, so compare quotes on the same scope. Victoria is the only state with a published rooming-house price; other states are quoted by written proposal.
How do I check that DollarBuild — or any builder — is registered?
Look the contracting entity up on the free public register for the state your lot is in, before you read the price: in Victoria the Building and Plumbing Commission’s Find and check a practitioner tool (the BPC replaced the Victorian Building Authority on 1 July 2025), in Queensland the QBCC licensee register, in New South Wales the NSW Fair Trading check at verify.licence.nsw.gov.au — and ABN Lookup for the entity itself. DollarBuild provides the registered building practitioner’s name and registration number for your state, and the contracting entity with its ABN, in writing with every proposal and before any contract; they are not yet published on this website, so check them on the register exactly as our builder-check guide describes.
How do I start?
With the address. The address check on the homepage reads the planning position of a lot and offers the written feasibility report by email for sites in Victoria, New South Wales, Queensland and Western Australia; the rooming-house address check reads a Victorian or Queensland address against Clause 52.23. Then compare the six offers and their state prices, open the supplied floor plans, and send the address with your preferred home through the enquiry form or by email. You hear back from a person, and the first thing you receive is the written feasibility read for the lot — no call until the zoning has been read.
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