If you are running out of space in your home, one of the biggest decisions is whether to raise the house and build underneath or extend out across your block.
Both options can work well, but the costs, constraints, and long term value can be very different. The right choice depends on your block, your home, and your plans for the future.
Raising a house involves lifting the existing structure to create legal head height underneath. This space can then be built in to include living areas, bedrooms, garages, or storage.
For many Brisbane and Ipswich homes, especially Queenslanders, this is often the most efficient way to add space without changing the footprint of the house.
Extending out means building additional rooms at ground level, increasing the overall footprint of the home.
This can include side extensions, rear extensions, or even wrapping around the house depending on available land.
There is no single price that applies to every project, but here is how the two options typically compare.
Raising and building under
• Cost includes lifting the home, new foundations, and building the lower level
• Often more cost effective when creating large amounts of new space
• Makes use of the existing structure rather than duplicating it
Extending out
• Can be cheaper for small additions such as one room
• Costs increase quickly when extending multiple areas
• Requires new roofing, walls, and structural connections
In many cases, once you are adding significant space, raising and building under becomes more cost efficient per square metre.
Your block plays a major role in the decision.
Extending out requires available space and must comply with boundary setbacks, site coverage limits, and easements.
Raising and building under keeps the same footprint, which makes it ideal for:
• Smaller blocks
• Inner city suburbs
• Character homes with restrictions
• Properties close to boundaries
If your block is limited, extending out may not even be an option.
Both options require approvals, but they differ in complexity.
Raising a house is often supported in character areas because it preserves the existing home. This can make approvals more straightforward compared to major outward extensions.
Extending out may trigger additional requirements depending on site coverage, height limits, and boundary setbacks.
This is often overlooked but very important.
Raising and building under
• Work happens below the existing home
• In some cases, parts of the home may remain usable during stages
• Clear separation between old and new structure
Extending out
• Construction can impact existing living areas more directly
• Roof tie ins and structural connections can be disruptive
• May require more temporary relocation depending on the scope
Raising and building under often delivers stronger long term value.
Why
• Maintains yard space
• Improves street appeal and elevation
• Creates a full additional level of living
• Better suited for flood resilience in some areas
Extending out can still add value, but it reduces outdoor space and may not achieve the same overall transformation.
The answer depends on the size of your project.
For small additions, extending out can be more affordable.
For larger projects where you are adding multiple rooms or a full level, raising and building under is often more cost effective and delivers better long term results.
Every property is different, so the best approach is to assess:
• Your block size and layout
• Your long term plans
• Budget and scope of works
• Council requirements
Starting with the right advice can save time and avoid costly changes later.
If you are considering adding space to your home, understanding your options early makes a big difference.
Raise My House® works with homeowners and builders across Brisbane and Ipswich to safely lift homes and prepare them for build under projects.
If you are unsure which option is right for you, our team can help you understand what is possible and how to move forward.
