Full Basement Construction
Building from scratch, or planning a development? As seasoned basement construction contractors, we deliver end-to-end turnkey basements, from excavation and retention through to waterproofing and fit-out.
Substructure Solutions · Sydney, NSW
Underground Construction & Structural Work in Sydney
Substructure Solutions provides expert underground construction for Sydney homeowners and builders, from brand new basements to foundations that have started to shift. If it happens below your floor, we can help.
- Licensed NSW Builder
- 10+ Years Below Ground Services
- Free Site Assessment
About us
Underground Construction Done Properly
We help homeowners and builders in Sydney make more of the space below their properties. Every job starts with a diagnosis and if a project needs an engineer or an approval, we sort it before anyone digs. We have a straightforward approach on every project, which keeps our underground construction jobs in Sydney on track while your home stays supported.
Create New Space
Basements, underground rooms, bunkers and safe rooms are carved out beneath the house, built to stay dry and purposefully made for the long haul.
Stabilise the Structure
Underpinning and foundation repair to better stabilise a moving home. We also offer wall removal when you want to open up your layout safely.
TESTIMONIAL
Sarkis successfully repaired my leaning pier under the house. His expertise was evident throughout the job. He finished the job in record time. To my amazement! He is brilliant!!! I had been worrying about the pier for some time b4 I called him. Don’t bother calling anyone else! Satisfied customer 100 per cent.
Bellywub69
Sarkis from Substructure Solutions recently completed a sizeable repair job for me. He was professional and easy to work with starting from the initial assessment and quoting, through to completion of the job. It was completed on time and on budget, and he was always quick to address my many questions and concerns along the way. I should also mention that he went above and beyond when he helped to secure a shed that threatened to blow away in a mini-gale – quite unrelated to the contracted job. I am very happy to recommend Sarkis and his team.
Chris Wickremasinghe
Top bloke, transparent with the pricing. Came early, did the job (added three support stumps) and finished early. Easy to work with. Definitely would work with again in the future.
Chris
What we build
Our Residential Underground Construction Services
We pride ourselves in built-to-last residential underground construction in Sydney. We work around your activities and keep disruption to a minimum wherever we can. Here's a quick look at how we can help:
View basement packages →
Basement Extensions in Sydney
Short on room but love where you live? Our basement extensions in Sydney add extra bedrooms, home gyms, storage or multi-use rooms without building up or out.
Underground Bunkers
We build strong, fire-safe underground bunkers for both residential and commercial properties. Use yours for protection, storage or a secure retreat, we customise the bunker around your purpose.
Underground Rooms
A wine cellar, home office, gym or studio – our custom underground rooms are designed around how you'll use the space and the footprint you have to work with.
Panic & Safe Rooms
Our panic and safe rooms give your household a protected place to retreat if something goes wrong. We can reinforce an existing room or build a dedicated space below ground.
Foundation Repair & Underpinning
Cracked walls and sloping floors are often a sign the ground under your home has shifted. Our foundation repair and underpinning work brings the structure back within tolerance and helps keep it stable.
Wall Removal
Want a more open layout? Our structural wall removal service covers the engineering and approvals, so the load is carried once the wall comes out.
Why Substructure Solutions
Your Trusted Underground Construction Contractor in Sydney
Picking underground construction contractors in Sydney can be overwhelming, but it usually comes down to experience and honesty. Here's what you get when you work with our team.
10+ Years Experience
As underground construction contractors in Sydney for over 10 years, we've seen most of what the ground here can throw at a project. We have the equipment, people, licences and experience to deal with any project.
Licensed Builder
Every job is led by a licensed NSW builder who stays involved from the first site visit to handover. When you work with us, you’ll be dealing with the same underground builders in Sydney from day one through to the end.
Local Ground Knowledge
Sandstone shelves and reactive clay behave very differently once the digging starts. We plan the excavation and establish temporary support around the site. Narrow side access and sloping blocks get planned for early too.
End-to-End Compliance
Structural codes and council requirements are built into the plan from the start. You'll receive the paperwork for each stage, so you have a clear documentation of the project.
Straightforward Advice
You'll hear what's possible and what it will cost before any work begins. If a simpler fix will do the job, we'll tell you. We'd rather you spend your budget on the right job than an extra one.
Our process
How Our Underground Builders in Sydney Work
Every project follows the same order, whether you need a single pier replaced or a full basement dug out. It's how we deliver quality underground construction in Sydney that owners can depend on, one step at a time.
-
Assess
We visit the property, look over the existing structure and work out what the site needs.
-
Engineer
Soil testing and a structural engineer set the design.
-
Method
We choose a method that suits your soil and how easily we can access the site.
-
Approvals
We prepare certification and any council submission the project needs.
-
Build
Work runs in stages so your house stays supported the whole way through.
-
Monitor
We bring the structure within tolerance and check that it holds. If anything needs adjusting, we sort it before we pack up.
-
Handover
You get the full documentation, and we leave the site clean.
Our work
Our Recent Projects
Blog posts
View all-
7 Panic Room Design Ideas for Australian Homes
A good panic room design should do more than hide a reinforced room behind a bookshelf. It needs to consider how quickly occupants can reach it, how the surrounding structure...
7 Panic Room Design Ideas for Australian Homes
A good panic room design should do more than hide a reinforced room behind a bookshelf. It needs to consider how quickly occupants can reach it, how the surrounding structure...
-
5 Common Basement Excavation Methods
Running out of space in your home, but can't extend upwards or outwards? An increasing number of property owners are looking underground to create more space with custom basement extensions...
5 Common Basement Excavation Methods
Running out of space in your home, but can't extend upwards or outwards? An increasing number of property owners are looking underground to create more space with custom basement extensions...
-
Residential Basement Construction Checklist
Building a basement under your home isn't as simple as grabbing a shovel and digging down. Between council approvals, structural engineering, waterproofing, and budget considerations, there's a lot to tick...
Residential Basement Construction Checklist
Building a basement under your home isn't as simple as grabbing a shovel and digging down. Between council approvals, structural engineering, waterproofing, and budget considerations, there's a lot to tick...
Built for Safety. Designed to Last.
From complex basement extensions to urgent structural repairs, we're the underground builders that Sydney families call when a project needs careful planning and expert execution. We plan thoroughly and build with care, so you're left with a new space that you can enjoy for years to come.
Ready to get started? Contact Substructure Solutions for a free site assessment and quote on your next project.