All guides
Every page on this site, grouped by the question it answers. The numbers come from our cost model, government bond data and the current planning rules.
Cost calculator
Calculators
Rental yield calculatorYield, cash after tax and payback in 42 areasApproval rules by stateSize limits, lot sizes and approval routes, with a checker
Cost by state
Granny flat cost NSWSydney vs regional, line by line, and the granny flat rent discountSmall second dwelling cost VIC60 vs 80 m² after VC306, rents by councilSecondary dwelling cost QLDCouncil caps and infrastructure chargesAncillary dwelling cost WAPerth prices and the rent each size needsAncillary accommodation cost SAAdelaide prices and the 75% floor-area land tax testTasmania and ACTHobart bond data and Canberra costs
Rules and approval
Money: rent, tax and finance
Is it worth it?Tested against a mortgage offsetDoes it add value?Years of rent needed at each sale outcomeLand taxNSW after Hussein, Victoria from 2026Capital gains taxWorked examples and the 2027 proposalGranny flat for parentsPension rules, agreements and real costsFinancingWhich loan leaves the flat cash positive
Building choices
Site costs and connectionsSlope, sewer, access and bushfire: three blocks, one flatPrefab vs custom buildWhere factory-built starts to save moneyKit and owner-builderThe saving per hour of your timeGarage conversionOur cost estimate and the building code1 vs 2 bedroomsWhich pays more, area by areaComparing builder quotesTurning a 'from' price into a real one