Ground Floor Additions Blue Mountains – Custom Home Extensions for Modern Living
Who We Are
With over 20 years of experience in Western Sydney, including the Blue Mountains, our licensed builders handle every detail—from initial design to council approvals and project completion.
We focus on home expansion services that maximise living space without the stress of relocating. Using fixed-price contracts and clear timelines, we ensure transparency and peace of mind while delivering high-quality craftsmanship.
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.
Why Us?
- Local expertise – Family-run business based in the Blue Mountains, familiar with local councils and site conditions.
- Extensive experience – Over 20 years of completing second-storey and ground-floor home extensions.
- Minimal disruption – Many clients stay in their homes during construction.
- Transparent pricing – Fixed-price contracts with clear timelines and penalties for delays.
- Comprehensive project management – From planning and approvals to final handover, we manage every stage of the project.
Our Service Locations
Keystone Building assists with ground-floor additions and home extensions throughout Western Sydney, including the Blue Mountains. We are familiar with the requirements of local councils and understand how to adapt to various site conditions in the area.
We work in these areas:
- Blue Mountains
- Katoomba
- Leura
- Wentworth Falls
- Springwood
- Glenbrook
- Winmalee
- Blaxland
- Faulconbridge
Expanding Your Home, Not Your Footprint
Transform your existing property with custom ground floor additions in the Blue Mountains designed to enhance comfort, functionality, and value. At Keystone Building, we specialise in creating seamless home extensions that blend perfectly with your current architecture. Whether you’re adding new bedrooms, a spacious living area, or a modern open-plan kitchen, our experienced team ensures every detail aligns with your vision and lifestyle. We manage the entire process—from design and council approvals to construction and final handover—so you can enjoy a stress-free renovation journey.
