Build up with double storey extensions that seamlessly integrate with your existing home.

Reserve Your Free Home Assessment

Add value and space to your home, without compromising on your outdoor area.

By adding a second-storey extension to your Melbourne home, you can potentially double your living space while preserving the outdoor area your family enjoys.
If you love where you live but don’t have the space your family needs, contact a specialist second-storey extension builder to enhance your living space — all while capturing any potential views and improving your property’s street appeal.
Contact XL Built today to discover your property’s potential.
Second Storey Additions

Floorplans

Add more space for your growing family with a second-level extension, or perhaps create a secluded parent’s retreat.

Each project we undertake is custom-designed to perfectly match your home and family’s unique needs. Below are some example plans to inspire and help you visualise possibilities.
Large Family Luxury
Comfort For Two
Parent’s Retreat
Self Contained Luxury
Home Office Dream
The Necessities & More

Save money by adding a second storey addition.

Real Estates Fees

$35,000*

+

Real Estate Fees — There are numerous fees involved in buying and selling property. If you decide to sell, home styling alone can cost up to $6,000. Then there's the marketing, which can range from $1,000 to $10,000 depending on your budget. Additionally, there may be an auction fee of $400 to $1,000, on top of the real estate agent's 2% commission. Based on Melbourne’s median house price of $918,000, this could amount to approximately $18,000.
Conveyancing Fees

$2,000*

+

Conveyancing Fees — These can vary, but you can expect to pay between $800 and $2,000. It may not seem much in isolation, but it quickly adds up.
Stamp Duty

$50,000*

+

Stamp Duty — For a house priced at the Melbourne average of $918,000, you would pay around $50,000 in Stamp Duty. The amount fluctuates based on several factors, such as:
  • Your location in Australia
  • The type of property you’re buying
  • Whether you’re a first home buyer
  • Whether you’re purchasing vacant land, a new home, or an established home
  • If you are a foreign purchaser
Moving Costs

$2,000*

=

Moving Costs — The cost of moving can also be significant. Renting a van or truck for a day may cost around $200, while hiring professional removalists (often the best choice) is likely to cost around $2,000.
Savings

$89,000*

Savings — By deciding not to move, you could potentially save approximately $89,000, which could be reinvested to improve your current home. Make a smart investment and choose an XL Built second-storey addition.
Start Your Free Project Evaluation

To reinvest into your second storey addition.

*Approximate AUD$ value only.

How much does a second storey addition cost?

When comparing the cost of a second-storey addition in Melbourne, it’s important not to rely solely on price per square metre. Here are three key reasons why:
1. Quality can vary immensely — Not all second-storey extension builders in Melbourne deliver the same standard of work. Materials, finishes, and workmanship differ, which directly affects pricing.
2. Every project is different — The scale, complexity, and areas involved in a new double-storey addition will influence the cost per square metre. Designs with complex shapes and angles will naturally be more expensive than simple square designs due to the additional materials required. Kitchens and bathrooms also significantly increase the cost, with kitchens ranging from $30,000 to $75,000 and bathrooms from $20,000 to $40,000. Without these rooms, the overall cost of a second-storey addition will be considerably lower.
3. Every property is different — The existing home may need upgrading to accommodate the new second storey. The design of the second-storey extension and how it integrates with the current structure will determine the extent of upgrades needed on the ground floor. Additional factors like council overlays, energy efficiency, bushfire zones, and soil classification can also impact the overall cost and affect the cost per square metre.
On average, the cost of a second-storey addition starts at approximately $250,000.

As third-generation extension builders with 45 years of experience, the team at XL Built provides detailed assessments and accurate quotes. With clear communication and foresight, XL Built works with you throughout the build to ensure additional costs are minimised and managed.

For an accurate estimate, contact XL Built today.

XL Built
is with you every
step of the way.

At XL Built, we manage the entire process from start to finish, so you can rest easy.
From planning, permits, and council regulations, XL Built has everything covered with our trusted team of second-storey addition specialists.
We’ll work closely with you throughout the design process to create a second-storey addition tailored to your household's needs.
XL Built maintains regular communication with you and your family, establishing a clear timeline for the build. We also offer a convenient online portal where you can check the progress of your project at any time.
Choose a quality, custom second-storey addition. Choose XL Built.
Book Your Complimentary Design Session

Download: Home Extension Insights

Discover essential insights on why extending your home could be the best decision you make. Download our free resource to explore key advantages and get a clear overview of what’s involved in transforming your space.

The Process

Design
Build
Maintain
At XL Built, we customise every build because no two families are the same. We work closely with your family to understand your needs and design a home that’s as practical as it is comfortable for your lifestyle.
Our design process is divided into three stages to ensure that nothing is overlooked and that all your single-storey extension ideas are fully considered.
This system is unique to XL Built and consists of:
Stage 1 – Concept Design
Stage 2 – Design Development
Stage 3 – Final Design and Documentation
Your approval is required at each stage, ensuring nothing is missed and that your ground-floor extension costs remain controlled. XL Built also offers a money-back guarantee on your home extension design, giving you creative freedom without hesitation.
Our experienced team handles all necessary permits and documentation, taking the stress off your shoulders. Throughout the process, communication is key, with multiple ways to stay connected, whether online, directly, or through our exclusive internal portal.
Your vision is our vision.
Registered with the Building Practitioner’s Board, all our builds are executed to exceed industry standards. Every project is covered by multiple insurances and does not commence without Home Owner’s Warranty insurance, Public Liability insurance, Contract Works insurance, and Work Cover.
Once your single-storey extension design is complete, our team creates a custom schedule for your build. Adhering to strict timelines, this schedule ensures the fastest possible completion for your home.
After scheduling and securing the deposit, we begin the project with any necessary demolition. Throughout each stage of the build — from the base, frame, roof cover, lock-up, internal wall lining, fixing, to completion — more than 2,000 items are assessed on our quality management checklist. Our team ensures nothing is overlooked.
Should changes be needed during the build, we offer flexibility in design while maintaining close communication with you. Our highly skilled, friendly, and respectful tradespeople are handpicked to ensure only the best work on your dream home.
Even after our work has finished, our service continues. Once you move into your dream home, we offer a three-month maintenance period to address any unforeseen defects that may arise.
As our work is executed by highly skilled tradespeople, we are confident in the quality of our craftsmanship. That’s why we provide a 10-year structural guarantee, ensuring peace of mind for the future of your home.
We offer ongoing support and are always available to help make you as comfortable as possible in your newly built home. Our service begins the moment you visit our website and extends for many years as you enjoy the perfection of your custom-built home.

Benefits

Increased Value
Comfortable Living
Built for You
Inner Sanctuary

Unlock the potential of your property.

Register now for a free project assessment.

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