Ground Floor Additions
If your family is growing or your lifestyle is changing, moving house is not always the best option. A ground floor addition could be the perfect solution. Instead of building up and disturbing your roofline, you can extend outward. Adding bedrooms, bathrooms, living areas and more to your existing home.
Higher Energy Efficiency
Modern ground floor extensions use high-performance glazing, cross-ventilation, and quality insulation to keep energy bills low year-round.
Ideal for Accessibility
Single-level living means no stairs, perfect for young children, elderly family members, and ageing in place.
Indoor-Outdoor Flow
Connect your home to the backyard with bi-fold doors, wide openings, and covered alfresco areas that extend your everyday living.
Boost Property Value
A well-designed ground floor addition is a strong investment, often lifting property value by 5 to 20 percent depending on the finish.
More Living Space
When you need more room, the first thought might be to move or rebuild, but with property prices climbing and stamp duty adding up, 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 the home you already love.
Keystone Building services homeowners across Western Sydney and the Greater Sydney region, including Penrith, Blue Mountains, Hawkesbury, Blacktown, The Hills, Camden, Wollondilly, Liverpool, Campbelltown, Fairfield, Parramatta, Canterbury-Bankstown, Sutherland, Inner West, Ryde, Northern Beaches, and surrounding areas.
A ground floor extension can also lift your resale value significantly, especially when combined with an open-plan kitchen or new living zone. Whether you want to future-proof your home or create more everyday space for your family, extending outward at ground level, rather than going with a second-storey addition, 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?
Why Choose Us?
Local Expertise: As a team experienced in local ground floor additions, we understand the unique challenges and opportunities of Penrith homes.
Quality Craftsmanship: Every project is built to the highest standards, ensuring lasting value and exceptional finishes.
Transparent Pricing: No hidden costs—our quotes are clear, detailed, and tailored to your project.
Personalised Service: We work closely with you at every stage, from concept design to project completion.
On-Time Delivery: We respect your schedule, completing projects efficiently without compromising quality.
How We Can Help
We offer end-to-end services for ground floor additions Penrith, including:
Design & Planning: Tailored concepts to suit your home, lifestyle, and budget.
Council Approvals: Handling permits and approvals to streamline your project.
Construction: Expert building services, minimising disruption while delivering outstanding results.
Custom Solutions: Bedrooms, bathrooms, kitchens, living spaces, home offices, and more.
Support & Advice: Guidance on materials, layouts, and trends to make informed decisions.
Our goal is to create functional and beautiful spaces that increase your home’s value and enhance everyday living. Whether you’re looking for a single-room addition or a full ground floor extension, Keystone Building is your trusted partner for local ground floor additions in Penrith.
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
Start Your Home Transformation
Your first consultation and quote are on us!
Ground Floor Additions FAQs
Beyond size and finishes, site-specific factors often shape the final cost. Asbestos removal in pre-1990 homes, restricted site access, and council-required stormwater upgrades can each add to the overall budget. A construction loan, which releases funds in stages as the build progresses, is worth discussing with your lender early in the planning process.
The construction phase for a standard ground floor extension usually runs 12 to 16 weeks, but the full timeline from first consultation to move-in is typically 6 to 12 months once design, engineering, and approvals are factored in. Locking in your design decisions early is one of the best ways to keep things moving.
It’s important to notify your insurer before construction begins. Your builder should carry their own construction insurance, but your home and contents policy will also need a construction period endorsement to make sure you are fully covered throughout the build and after handover.
In NSW, smaller projects that meet the Exempt and Complying Development Codes may qualify for a Complying Development Certificate (CDC), typically issued within 10 business days. Larger projects or homes in heritage, flood, or bushfire zones generally require a Development Application (DA) through your local council, which can take several months.
Yes, because the work happens at ground level and extends outward from the existing structure, daily life inside can continue with relatively minor adjustments. If the build involves your kitchen or main bathroom, a portable kitchenette or second bathroom may be needed for a few weeks.
A ground floor extension adds new floor space by building outward from the existing footprint. A renovation reconfigures or upgrades the existing space without adding any new square metres. Combining both into a single project is often more cost-effective, as trades can be coordinated together rather than mobilised twice.