- (03) 9792 1966
- reception@extensionsunlimited.com.au
- Servicing Melbourne & suburbs
Second Storey Specialists · Est 1994
Second storey house extensions for a dream home in Melbourne
Imagine your dream two storey home, expansive and luxurious, perfectly accommodating your family and lifestyle. As upstairs extension specialists, we transform your cherished house into a space that integrates with your existing structure, offering your ideal home.
30+
Years building
1000+
Homes extended
70+
Five star reviews
Since 1994
Renovation excellence
Fully licensed & insured
Master Builders member
Fixed price contracts
Guaranteed Completion Date
Why choose a 2nd floor addition
Adding a second storey adds value to your home and creates space for your family
Our in-house extension designers create stunning double storey extensions that take into account your aspirations and budget. Enjoy the benefit of customised layouts and exceptional value, eliminating the need for additional architects. We design upper floor extensions that respect the character of your home while adding immeasurable value and functionality.
Improve your living space
Double your available square footage, creating dream bedrooms, spacious entertainment areas, or dedicated home offices.
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Increase your home's value
Uplift your property's market appeal and value, making it a sound investment for the future.
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Perfect integration
Enjoy a cohesive living experience as your upper floor extension beautifully blends with your existing home, preserving its character.
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Custom solutions
We design functional spaces to perfectly suit your desires, from the first concept through to the finished floor.
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Our work
Completed house extension projects
A selection of Second storey extensions built to stay where you love in Melbourne.
Parkdale
Second Storey & Ground Floor ExtensionBox Hill
Second Storey Extension & Ground Floor RenovationMitcham
Second Storey & Ground Floor ExtensionFairfield
Second Storey & Ground Floor ExtensionHeidelberg
Second Storey Extension & Ground Floor RenovationEssendon
Second Storey Extension & Ground Floor RenovationOur process
Our second floor extensions process
From your first free consultation to the final certificate, four clear stages keep your double storey build on track.
1
Design service
Free initial meeting with your house extension designer. Tell us about your dream home so we can provide customised and informed solutions.
2
Building permits & plans
Permits are essential before building can begin. We'll get approval and take care of any fees for you, communicating directly with the council.
3
Contracts
Work is carried out in three stages to minimise disruption: Design Development, Preliminary Works Agreement, Final Contract.
4
Construction
Our constructions are regularly inspected by independent surveyors who issue reports during the progress, with a final certificate upon completion.
Since 1994
Creating extra space for Melbourne families just like yours since 1994.
Why choose a 2nd floor addition
More than a ground floor extension
When you want more than a ground floor extension, adding a second storey — or extending one that already exists — can be the perfect solution.
Expanding your home with a second storey addition gains precious square footage for growing families, home offices or larger living areas — blending perfectly with your existing home and boosting its value for future resale.
Cost of a second floor extension
What can affect the cost of any extension on your property are factors like property access, the presence of trees (either on your property or a neighbour’s), the condition of the soil, and the slope of the land, which can affect the ease of excavation.
Registered master builders
Registered building practitioners with full warranty insurance on every double storey project.
Fixed price, no hidden costs
Impeccable communication means no surprise extra costs during construction — you know the price up front.
Guaranteed start & completion
A complete end to end process all at the one company, keeping your project on schedule and within budget.
Google reviews
Homeowners who’d build with us again
My husband and I recently finished a second story extension and ground floor bathroom renovation and the entire experience with EU was fantastic. From our initial meeting with Ted, our designer, we felt confident in their ability to deliver exactly what we…
James Russell
June 2026
We couldn't be happier with the incredible work done by Extensions Unlimited on our first-floor extension. From start to finish, the entire experience was seamless and professional. A huge thanks to Nick Uren, Building Manager — he was exceptional throughout…
Matt Wilson
April 2026
We wanted to knock down and build a new home, however the cost was too prohibitive. We engaged Extensions Unlimited and WOW are we glad we did. Our nervousness turned to excitement by our designer, Wayne, and his team, and after providing several concepts…
Jill Douglas
March 2026
Ready when you are
Let's design the home you've been imagining.
Get in touch
Arrange a free Design Consultation
Tell us a little about your home and what you'd like to achieve. We'll be in touch within one business day.
Call us
(03) 9792 1966Office hours
Monday to Friday, 8:00am - 4:00pm