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How to estimate the cost of knockdown-rebuild house (2 storey 5 beds)?

3 years ago
last modified: 3 years ago

Looking for some tips on various factors to estimate the cost of knockdown-rebuild house.

Some background info ( about current lot and things which we need in new house)

current :


3b house ( built around 1970s) on 620sqm land ( little sloppy towards main street)

things we are looking for in new home (NW Sydney)


> Custom build home

> modern/contemporary design (flat roof) - 45-50square - 2 storey - 5 bedders, double garage

> ground floor : living room, home theater, study nook, one bedroom(1) with ensuite, butlers pantry, powder room, laundry, family room, meal area, rumpus (or kids play area)

> first floor : master bedroom(2) with ensuite with walk in robe - front side with balcony access

bedroom(3) with ensuite with robe

bedroom(4) and (5) with robe

leisure/entertainment area

bath and wc (common area)


Of course we understand the cost also depends on type/quality of inclusions, builders etc but this is just an idea we are trying to get so its just an estimate :) So based on your experience please help to understand how to estimate cost of knockdown-rebuild house - which factors we need to consider and their appro cost.

Thanks a lot everyone!

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