Where duplex estimates usually go wrong
Duplex risk often sits in shared works: services, stormwater, driveway, retaining, party walls, fire separation, acoustic requirements and mirrored-but-not-identical layouts.
A strong estimate should avoid treating the job as a simple two-times single dwelling calculation unless the drawings genuinely support that approach.
Documents that materially change the number
Architectural plans establish the main geometry, but engineering, geotechnical reports, BASIX, NatHERS, stormwater and landscape drawings can all move the estimate materially.
When those documents are missing, the estimate should disclose the assumption rather than bury it in the trade total.
How EstiFlow handles duplex estimating
EstiFlow prepares a builder-ready estimate pack with report narrative, BOQ workbook, construction programme and subcontractor pricing packs for duplex projects.
The goal is to help builders price faster while keeping the scope gaps visible before they commit to a tender number.
Common questions
Can EstiFlow price attached and detached duplexes?
Yes. EstiFlow supports attached and detached duplex projects when DA-stage architectural drawings are supplied.
Does a duplex estimate include both dwellings?
Yes. Duplex pricing is prepared for the full project scope supplied, including shared works where shown or reasonably inferable from the documents.
What is the EstiFlow duplex price?
The fixed checkout price for a duplex estimate is listed on the pricing page and is GST inclusive.