Single vs. Double Storey: Which Is Better for a Rear Subdivision?

By Christian G

When subdividing your backyard to build a second dwelling, one of the biggest design decisions you’ll face is whether to build a single or double storey home. Both options have their advantages and challenges, and the right choice will depend on your site, budget, and long-term goals. Here’s a breakdown to help you weigh the pros and cons of each.

Single Storey Homes

Single storey homes are generally more affordable to build, as they require simpler foundations and eliminate the need for a staircase. This type of construction is also typically faster to complete due to its reduced structural complexity. In terms of accessibility, single storey homes are ideal for downsizers or people with mobility concerns, as all rooms are located on one level. Maintenance is also easier and more cost-effective, especially when it comes to external features like the roof and gutters.

However, single storey dwellings require a larger footprint to fit all rooms on a single level. This can reduce the amount of usable outdoor space, which is often already limited in rear subdivisions. Additionally, placing all rooms at ground level can create privacy concerns, particularly if the dwelling is close to the existing home or neighbouring properties.

Double Storey Homes

Double storey homes are often the preferred option for tighter lots, as they allow you to build up rather than out. This approach helps preserve outdoor space for courtyards or gardens, which can improve both livability and resale appeal. Separating living areas downstairs and bedrooms upstairs can also offer better privacy and a more practical daily layout. In some cases, a second level provides improved natural light, ventilation, and even potential views.

That said, building a double storey home generally involves higher construction costs and longer build timeframes. The need for structural supports, a staircase, and more complex labour all contribute to this. Accessibility may be an issue too, especially for households with elderly residents or young children who may struggle with stairs.

What to Consider When Choosing

Your decision should take into account the size and shape of your block. For narrow or shallow lots, a double storey design often makes better use of space and can help retain a functional backyard. Orientation is also critical; two-storey homes must be planned carefully to avoid overshadowing neighbouring properties and breaching local planning regulations. Budget is another major factor. If you’re looking for a more affordable and straightforward build, a single storey may be the better option. Lastly, consider your target market. Downsizers may favour a single level, while families might appreciate the added space and separation offered by a two-storey design.

Final Thoughts

There’s no one-size-fits-all answer. A single storey design can be cost-effective and simpler, while a double storey home makes better use of limited space and offers layout flexibility. The best option will depend on your site constraints, personal goals, and local planning requirements.

Still unsure? Our team can help assess your site and guide you through the best solution for your subdivision project.