How Much Does a Second Storey Addition Cost?

A second storey extension can be a huge consideration for homeowners. The process affects the look, feel, and functionality of the house in a significant way. 

Moreover, there are heavy house extension prices involved in second storey additions. 

In Australia, the average cost involved in second storey additions generally ranges from 300,000 AUD to 600,000 AUD, but luxurious second storey additions can exceed this cost as well. The final cost depends upon the size, design, structure, and quality of the final construction.

Many homeowners opt for second storey additions despite the cost because of the benefits involved in having an additional space in the house rather than looking for a new one elsewhere.

This blog gives you cost to add a second storey to a house, factors affecting it, and ways to reduce the cost. Let’s dive deeper into it. 

Why You Need Second Storey Addition?

Adding a second story to your home provides additional living space without requiring additional land use. Here, if your land size is limited and zoning considerations do not permit expansion of land outside, then this method of adding a second storey to your house may be ideal. 

It is beneficial, especially for those with families looking to add additional bedrooms or even a home office, among others. When comparing the extension vs. rebuild decision, many homeowners lean toward a second storey to keep their outdoor space and improve home value.

Constructing upwards will also increase privacy. The bedrooms are always quiet and out of the way of the activities of the day. Additionally, it increases the value of the property, especially where the location is in high demand. 

A decision to move house seems expensive when you consider add a 2nd story to your house. 

How Much Does It Cost to Add a Second Story?

Putting a second story on a house depends on build size, structure, and finish level. On average, Australian homeowners spend between AUD 300,000 and AUD 600,000.

The table below gives the clear second storey extension cost breakdown. Let’s have a look at extension cost estimate here. 

1. Average Second Storey Addition Costs

The table shows the average second story addition cost in Australia. 

2. Cost Breakdown by Stage

These figures give a clear starting point. Your home’s structure and choices will push the second storey extension cost Australia up or down.

3. Second Floor Extension Cost in Australian Cities

This table gives you a clear idea of the second floor addition cost in Australian cities.

Key Factors That Affect the Double Storey Extension Cost 

Several factors influence the home extension cost. Let’s understand these factors in detail.

1. Existing Home Structure

The older dwelling may require renovation work to handle additional weight. This escalates the cost of labor and materials. Houses with a weak foundation tend to be more expensive.

2. Size and Arrangement

Greater floor space leads to an increased cost base. Open plans require heavier beams and greater support. These factors drive higher expenses.

3. Design Complexity

Simple box design models cost less. Custom shapes, balconies, and ceilings with vaults increase the time and average cost of second storey extension. 

4. Materials and Finishes

Typical finishes keep the cost down. Upmarket flooring, custom cabinetry, and high-design fixtures drive the adding a second floor to existing house cost upwards.

5. Access and Site Conditions

Limited space around the home can make it harder to bring in materials and equipment. Trades may need extra time to move items safely. This often increases labor hours and house extension costs.

6. Council Approvals & Rules

There are factors associated with planning approvals, heritage regulations, and local bylaws that influence timings as well as costs. There are likely to be additional costs if delays occur.

How to Reduce Second Storey Addition Costs?

Although the expenses are high, proper planning will give you the cheapest way to build a second floor with controlled spending. Here’s how you can reduce second storey addition prices. 

• Keep the Design Simple: A clean layout with no corners and changes is cheaper to erect. Additionally, it is time-saving.

• Align With Current Plumbing Lines: This makes the work of installing plumbing simpler and less expensive.

• Select Standard Materials: Windows, doors, and fittings that are not custom are always cheaper.

• Plan Everything Early: Last-minute changes lead to a wastage of labor hours and materials. Finalization of plans prior to construction work would save costs.

• Engage the Right Professionals: Skilled builders can detect problems early. They avoid costly errors. This saves money in the long run. 
  
  

Choose Trusted Tradie Network for Hiring the Right Professionals 

Adding 2nd floor to house requires professional builders, design experts, and trade technicians. Hiring the wrong people can cause unwanted project delays and costs to skyrocket. The Trusted Tradie Network connects homeowners with professionals who are experts in their fields.

Every tradie profile is assessed for their skill level, experience, and ability to be trusted with the work. 

This is one way of easily comparing and selecting trade professionals for the job. You end up saving both time and stress while getting the best results out of the whole project.

When skilled people handle your project, the build stays on track and meets quality standards. That level of trust makes a real difference in large home projects.

Conclusion

The cost for a second storey extension is estimated to start at roughly AUD 300,000 and increase according to design, location, and build quality. While the upfront spend is high, the payoff often comes through added space, comfort, and long-term value. 

When planned well, building upward can be a smart alternative to moving. Take time to understand your costs, lock your design early, and work with skilled professionals. Good planning today leads to fewer surprises and a home that works better for years ahead.

FAQs

1. How much does it cost for house extension?

A house extension in Australia usually costs between AUD 150,000 and 400,000. The price depends on size, design, materials, and location. Larger extensions and premium finishes increase the total cost.

2. Do I need council approval for a second storey addition?

Yes, council approval is required for most second storey extensions. Councils check height limits, safety rules, and planning guidelines. Approval time and fees vary based on location and design complexity.

3. How long does a second storey addition take to complete?

Most of them take four to six months to complete. This includes design, approvals, and construction time. Weather, design changes, and council delays can extend the timeline.

4. What factors increase the second storey extension the most?

Design complexity, structural changes, premium materials, and poor site access raise costs. Older homes may need extra support work. Changes made during construction also increase labor and material expenses.

5. Are second storey additions more expensive in Sydney and Melbourne?

Yes, costs are higher in Sydney and Melbourne. Labor rates, council fees, and demand increase prices. Inner-city locations and limited access also add to the overall cost.