Start with the block, not the preference
Many families start with a strong preference for one level or two. The block often decides first. On a narrow or small lot, a single-storey home with four bedrooms may simply not fit with the required setbacks, private open space and parking. On a wide, deep lot, a single storey can give everything on one level with room to spare.
So the useful first question is: how much floor area do we need, and how much of the block can a single level take while leaving the yard we want?
Land use and outdoor space
A double-storey home puts the same floor area on a smaller footprint, leaving more of the block for the backyard, a pool, a granny flat or simply light between you and the neighbours. That is why double storeys dominate narrow-lot estates and many knockdown rebuilds where families want more space without losing the yard.
A single storey uses more land for the same floor area. On a large block that is rarely a problem, and the connection from every main room to the garden is a real advantage.
Cost drivers on each side
There is no fixed rule that one is cheaper. A double storey adds stairs, a structural upper floor, scaffolding, more complex engineering and sometimes longer build time. A single storey of the same floor area needs a larger slab and a larger roof, which are two of the more expensive elements of a house.
Which way the balance falls depends on the design, the site and the finishes. The fair comparison is to price both options for the same floor area, inclusions and site.
Everyday living
Single storey suits households who want no stairs — young children, older family members, anyone planning to stay long term — and makes cleaning, moving furniture and accessing the garden simpler. Double storey separates sleeping from living, which many families with teenagers value, and keeps bedrooms quieter.
A common middle path is a double storey with a guest bedroom and full bathroom on the ground floor, so the home works for visiting parents or for later life.
Light, views and privacy
Upstairs rooms usually get better light, breezes and outlook, and are more private from the street. On a sloping block a second level can capture views. Single-storey homes on wide lots can achieve excellent light with courtyards and well-oriented living areas, but on narrow lots the middle of a single storey can feel darker.
Approvals and planning controls
Upper floors attract more attention under planning controls: height limits, upper-level setbacks and overlooking of neighbours’ yards and windows. Complying development standards set these numerically, and a design that exceeds them may need a DA. Single-storey homes generally have an easier time with privacy and overshadowing controls.
Future flexibility
Adding a second storey later is possible but involves structural work and moving out; adding floor area at ground level later uses up the yard. If you expect your household to grow, it is usually cheaper to build the right size now than to extend.
How we help you decide
We look at the lot width, depth, orientation and slope with your brief, and show what each option would look like on the block. Our single-storey and double-storey design ranges are starting points that can be adjusted to suit.
Sources
NSW Planning — Complying development: https://www.planning.nsw.gov.au/assess-and-regulate/development-assessment/planning-approval-pathways/complying-development
NSW Planning Portal — Section 10.7 planning certificates: https://www.planningportal.nsw.gov.au/development-and-assessment/post-consent-certificates/online-section-107-planning-certificate-service