Second Storey Additions
If your family is growing or your lifestyle is changing, moving house isn’t always the best option. A second storey addition could be the perfect solution. Instead of expanding outward and sacrificing yard space, you can build up. Adding bedrooms, bathrooms, living areas and more to your existing home.
Preserve Outdoor Space
Build vertically to maintain your backyard, garden, or pool area— ideal for smaller blocks.
Add Views and Light
Second levels can open up elevated outlooks and bring in more sunlight, enhancing both value and lifestyle.
Get More Privacy
Create spacious master suites or quiet study areas completely separated from the main living zone.
Boost Property Value
Second storey additions are a strong investment, often delivering a higher return by substantially increasing usable floor area.
More Living Space
When you need more room, the first thought might be to move or rebuild — but with property prices climbing and land in Sydney scarce, that may not be the best option.
A ground floor addition offers a smart alternative, giving you more living space while increasing the value of your home.
A second storey can also increase your property value significantly—especially when combined with an internal renovation or new kitchen upgrade on the ground floor. Whether you want to future-proof your home or increase your resale potential, a second floor extension is an investment that pays off in square metres and lifestyle.
Feeling cramped in your own space?
Is your yard underused or impractical?
Not keen on extending upwards?
Before & After
Your Home, Transformed
A ground floor extention doesn’t just add space—it changes everything.
"To all the team at Keystone, a very big (and very belated) thank you for the wonderful job you all did on our house. It’s just like a new home and suits our bigger family perfectly and as for the timing it was just perfect. Thank you once again we will happily recommend you to family and friends."
Why Choose Us?
Built on Over 30 Years of Experience
A second storey adds an entirely new dimension to your home, opening up a world of opportunity to accommodate for your lifestyle. Here’s why people choose Keystone to complete their second storey addition.
Built On Time & Budget
We’re committed on completing your build on time and within budget.
Stay Home While We Build
Most clients stay in their homes during construction, no need to pay for rent or storage.
Disruption Kept to a Minimum
We keep noise, mess, & intrusion low, cleaning up daily and protecting your living space.
Customer-First Approach
We design with your lifestyle in mind and keep you involved every step of the way.
No Hidden Costs
Clear, detailed pricing in your contract—no surprises or unexpected charges.
Trusted Family Business
We’ve delivered quality second storey additions since 1997 with honesty and care.
Our Refined Process
Our team will usually be there between 7-7.30am and 3.30-4pm depending on the work being completed. If we need to access your home during times when you may be at work, we will discuss this with you to ensure a safe solution.
Keystone Home Additions are based in Penrith but have completed projects throughout the Sydney region.
Once council approval has been received and contracts have been signed we can generally start work in approximately 4 weeks however this will be confirmed as we approach this stage of the project.
We offer stylish designs made to seamlessly blend in with your existing home. Keystone consultants will present you with examples of before and after images to give you full confidence in the final outcome. You can see some of them HERE
For 95% of our projects, yes you can still live in your home during construction. Keystone commits to keeping your home clean and secure. We will make every effort to keep the disruption to an absolute minimum so you can stay in your home as we build but there will always be some dust, dirt and noise. Our friendly tradesmen use drop sheets and clean up after themselves at the end of every day’s work.
On average it takes from 2 months to 5 months but can take longer, depending on the size of your addition. No matter how big the job, Keystone gives you a precise and fixed build time bound by a contract with penalty clauses.
Our Project Manager is readily available to answer any questions and will also visit you and phone you for decision making and to keep you updated. You will also have their phone number to call if you have any questions.
Yes, Keystone has a number of unique guarantees to give you greater peace of mind. Get in touch to find out more.
Yes, we always give you a reference along with a list of previous work for you to drive by and look at.
No, Keystones Building Consultants can assist you with the design and our draftsman will prepare the plans for council approval. However, if you already have an architect we are happy to work with them to complete the project.
Yes! Keystone can take care of every aspect of the design and building process including engineering drawings and appropriate approvals.