Basement Builders in Sydney

Basement Construction

We build architecturally designed homes that reflect your lifestyle, values, and vision.

1

Quality Workmanship

We treat every home like it’s our own, using trusted trades, quality materials, and thorough internal quality control checks at each stage. Your home will meet all codes, match the approved plans, and be built to last.

2

Transparent Process, No Surprises

There are no hidden costs or unexpected surprises. We provide clear pricing, detailed proposals, and a step-by-step process, you’ll always know what to expect.

3

Post-Construction Guarantee

Our support doesn’t end at handover. We follow up at 3, 6, and 12 months to make sure everything is performing as it should. If it’s not, we’ll take care of it. That’s our commitment to long-term quality and peace of mind.

Brighton Le Sands Custom Home And Sauna
Wine Cellar Malabar
Arncliffe Duplex Custom Builders1

Expand Your Space with Expert Basement Builds in Sydney

Make the Most of Every Square Metre

In Sydney, where land is scarce and property values are high, basement construction is one of the smartest ways to maximise your space. Whether your block is narrow, sloping, or simply too valuable to sacrifice to build a garage or driveway parking area, a basement allows you to expand your home without reducing your outdoor living area.
Or maybe you have always wanted a wine cellar or a gym and pool area for your home.

A well designed basement adds functionality, lifestyle benefits, and resale value. With more custom built homes opting for multi-level living of up to three or even four storeys.

Basement Construction Services We Deliver:

  • Fully excavated basements for new builds and knockdown rebuilds
  • Underground parking solutions with single or multi-car capacity
  • Car turntable installation for narrow or tight-access sites
  • Basement-level lifestyle spaces, gyms, saunas, home theatres, wine cellars
  • Additional storage rooms and secure equipment spaces
  • Multi-level home designs with basements (subject to council approval)
  • Waterproofing and drainage systems for long-term protection
  • Integration of basements into duplex and multi-residential projects

Why Choose Phase Projects for Your Basement Build?

Basements demand precision engineering and specialist knowledge. Done right, they add enormous value. Done wrong, they can be costly and difficult to fix. That’s why experience matters.

We’ve delivered complex basement projects across Sydney, including:

  • Brighton-Le-Sands Waterfront Home: A luxury four-level residence with a basement-level home theatre, gym, and cedar-clad sauna.
  • Arncliffe Duplexes: A fully excavated basement level with private garages and integrated car turntables, built on a sloping site

Every Phase Projects basement is over-engineered for safety, waterproofing, and longevity, giving you peace of mind for years to come. Read more about the benefits of building a basement.

Underground Parking Basements For Your Home

Maximise Living Space

Moving your vehicles underground frees up valuable space above for living areas, outdoor entertaining, or landscaping. It’s ideal for tight urban sites and high-value suburbs where every metre counts.

Basements are Ideal for Narrow Or Sloping Blocks

On tight sites, we can integrate car turntables so you can drive straight in, have the car rotate to face the exit, and drive straight out — no reversing required.

More Than Just Underground Parking

Basements offer far more than just additional parking.
While underground garages are ideal for maximising ground-level living space and accommodating multiple vehicles, a basement can also serve as an extension of your home’s living and entertainment areas. Depending on council regulations and your design preferences, you can incorporate:

  • Cinema Rooms: A cozy retreat for movie lovers, offering a quiet and immersive viewing experience.
  • Home Gyms: A private workout space designed to meet your fitness needs without leaving home.
  • Sauna & Wellness Areas: A tranquil environment for relaxation and self-care.
  • Indoor Swimming Pools & Spas: A controlled environment for year-round swimming with minimal maintenance.
  • Additional Storage & Utility Rooms: Ideal for decluttering your main living areas and storing valuable items.
  • Rental Units or Home Offices: A flexible option to generate income or create a dedicated workspace.

Ready to Build Additional Underground Rooms?

From Design to Completion

Our process covers every stage of your basement build:

  1. Site assessment & feasibility: We evaluate your block, access, and soil conditions.
  2. Design & engineering: Working with architects and engineers to integrate your basement seamlessly into your home.
  3. Approvals: Managing all council and certifier requirements.
  4. Construction: Precision excavation, structural work, waterproofing, and fit-out.

Class 2 Registered for Basement Projects

Adding basement parking or storage beneath a duplex or multi-dwelling development often triggers Class 2 building classification — which requires specific builder registration under NSW law. Phase Projects is fully registered under the Design and Building Practitioners Act 2020 to deliver Class 2 residential projects, including complex basement builds.

This registration ensures your basement project meets all compliance requirements from excavation through to occupation certificate.
Read more about Class 2 building requirements in Sydney.

Underground Parking Driveway Arncliffe

Ready For A Quote & Consultation?

Begin your project with a complimentary quote and consultation that gives you clarity, confidence, and expert guidance. Whether you build with us or not, you’ll get a clear plan for your project. We will:

  • Answer your questions, including the ones you may not know to ask, so you can avoid costly mistakes.
  • Help refine your vision for your custom home or renovation and outline the best options to bring it to life.
  • Provide a realistic overview of building and renovation costs, showing where to prioritise investment for maximum value.
  • Explain how Phase Projects delivers custom homes and high-end renovations on time, on budget, and to the highest standard.

Your consult is with Mohamed, owner of Phase Projects, who brings over 20 years of experience delivering architecturally designed homes and renovations across Sydney’s Inner West, Eastern Suburbs and Southern Suburbs.

Get A Complimentary Quote

Receive a tailored, no-obligation quote from Mohamed within 24 hours. Prefer email? Contact us at info@phaseprojects.com.au.

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What Sets Us Apart

It’s not fast-tracked. It’s not left to chance. It’s designed to remove doubt, elevate quality, and deliver an experience as considered as the home itself.

No Surprises, No Stress

Far too often, homeowners are surprised and disappointed when their finished home is missing the features they discussed with their builder. With Phase Projects, we ensure that every detail is captured and included.

Deal Directly with the Us

At Phase Projects, you deal directly with Mohamed, the business owner. You’ll have his personal mobile number, receive immediate responses to your questions, and always be kept informed about your Project.

Highly Qualified tradespeople

Mohamed and his team bring hands-on expertise to every project. This hands-on background means that every aspect of your build is overseen by someone who understands the craft and pays attention to every detail.

Experience You Can Trust

With over 20 years of experience, Phase Projects has earned a reputation for reliability and quality. Our proven process, combined with a team of skilled tradespeople, ensures that you receive a first-class custom home.

Get Answers You Need—100% Free

Navigating the world of custom homes can be overwhelming. The quickest way to get answers and clarity on your custom home journey is to contact us.

No-Obligation Session

This session will be with Mohamed, the owner of Phase Projects, who will share over 20 years of experience in building custom homes across Sydney.

Client Testimonials

What Our Clients Have To Say

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Tracey Stapleton profile picture
Tracey Stapleton
31 July 2025
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We were introduced to Mohamed and his team through a friend who had completed a two-storey extension with him. From that moment, we knew he would be our builder of choice. Mohamed approaches each project as if he’s building his own home — the care, precision, and pride he takes in his work is truly exceptional. Throughout the entire process, we always felt that he was more focused on how we felt and on achieving the outcome we wanted, rather than treating it as just another project. Our only regret is not involving him from the very beginning to manage the design and approval process. Despite coming in later, the Phase team helped us finalise the administrative requirements to get our approval. As soon as we had approval, the team got straight to work. The build was completed to a high standard, and we were so impressed that we ended up expanding the scope along the way. Mohamed and his team delivered a full extension, including a new attic, kitchen, additional bedroom, bathroom, laundry, and a spacious family room at the rear — along with a new garage and concrete driveway. The finishes were fantastic, and we were genuinely pleased with the constant communication throughout the build. We always felt informed and involved, which made the entire experience even more reassuring. We’re now planning to renovate the front of our home early next year, and there’s no question — we’ll be going with Phase Projects again. The aftercare has also been exceptional. While others share horror stories about their building experience, ours was a dream. We honestly can’t relate.
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Jenna Palevski profile picture
Jenna Palevski
29 July 2025
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I can only say wonderful things about our experience with Phase! They are passionate, patient, knowledgeable and incredibly dedicated to their work and their clients. We had about an 18 month journey with Mohamed and team from the design process through to the completion of our beautiful custom build. We could not be happier with their service and their team and would highly recommend them when building your custom home.
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Sinead Burchell
22 August 2024
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Building our new home was a significant journey, and we extensively researched various builders, including some of the larger project home builders. Ultimately, we chose a boutique builder that would be personally involved on-site and deeply familiar with every aspect of our project. We were not interested in a production line approach. One of the standout benefits was the ease of communication. We could call or email anytime and receive prompt responses. Additionally, we had the freedom to choose materials beyond a predetermined range from their warehosue. Even their suppliers were accommodating; if we didn’t find what we liked, we could suggest our preferred suppliers. This flexibility was invaluable. We wanted to be hands-on with our interior selections and layout without incurring excessive costs for interior designers. An architectural interior designer assisted us with layouts and drawings, but we managed the material selection ourselves. This option, provided by Phase, not being limited to a few choices, was particularly appealing. The open line of communication and transparency were consistent throughout the process. We had regular on-site meetings, which kept us informed and involved. We are extremely happy with the finished product. The handover was seamless, and we couldn’t be more satisfied with our new home.
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Chris Morrison profile picture
Chris Morrison
13 August 2024
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I built my dream home with Phase Projects and Mohamed was excellent throughout the entire process, always available and ready and able to resolve any issues that inevitably come up with the build of a high end property. Mohamed ensured that the build was done to the highest standard and I cannot recommend Phase Projects highly enough.
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Zaynab Saab profile picture
Zaynab Saab
6 August 2024
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We had a seamless experience with this experienced builder. A known industry professional who bought our dream home to life. Mohammed and his team were very respectful of our home and our space and made every effort to deliver on all their promises. His knowledge and networking was admirable and we always felt at ease knowing we were in such experienced hands. We were building during covid lockdown and had multiple other unavoidable hurdles along the way. Our builder navigated us through it all with professionalism and class. Our home is everything we ever dreamed of and more. We couldn’t be happier with the whole experience and Phase projects delivered exceptionally. Highly recommended!
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Hanade Beydoun profile picture
Hanade Beydoun
6 August 2024
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We highly recommend this builder. Phase were professional, on-time and reliable. They did a great job and delivered on their promise. We are very happy with their work.
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Jim Krakas profile picture
Jim Krakas
25 July 2024
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Working with Phase was a seamless experience. Their consistent communication made all the difference, guiding and supporting us through every step of our custom home process. They provided assurance and expertise, making the entire journey enjoyable. It was a pleasure to work with them.
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Zak Prime profile picture
Zak Prime
25 July 2024
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I reached out to Phase based on several trusted recommendations from industry trades. From our first meeting, I was immediately impressed by Mohamed's organisation, knowledge, and passion for his work. Throughout my project, Phase demonstrated exceptional site management, attention to detail, and expertise in design, construction, and trades. Phase's dedication to the build and commitment to scheduling is truly professional. Mohamed has a remarkable ability to troubleshoot and address any issues or deficiencies that arise. Phase prioritises customer service and client satisfaction, both during and after project completion. I highly recommend their quality workmanship.
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Zoe
24 July 2024
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We had the very best experience with Phase. From the first meeting, we knew we were in good hands. This team truly cares about what they do and takes pride in their work. We hired Phase to do our renovations and first-floor extension, a project many builders before them said couldn’t be done due to the timber-clad structure downstairs and concerns about the footing's strength. However, with the help of Mohamed and his design team, they made it possible, and we got our DA approval seamlessly. The builder and contractors were all lovely and very respectful of our space. They were honest and incredibly helpful when we had questions about fixtures, fittings, and materials. The process was completely stress-free for us, though we imagine it might not have been for them at times, but you wouldn't know it from their professionalism! Nothing was ever too hard for them, and they were very easy to talk to and deal with We couldn’t be happier with the end result, and the great energy they brought to our house lives on in our walls. We are very grateful.
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Jafz
22 July 2024
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We were incredibly pleased with the entire experience working with Mohamed and his team. Their personable and relatable nature made the process smooth and enjoyable. The team completed the work within the promised timeframe, which was impressive and greatly appreciated. What stood out the most was their extensive knowledge and professionalism. They consistently demonstrated a high level of expertise and integrity, ensuring that every detail of our new home met our expectations. The final result exceeded our hopes, and we are absolutely delighted with our new home. We wholeheartedly recommend them to anyone considering any building work. Their commitment to customer satisfaction and the quality of their work is truly exceptional.
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Basement & Underground Parking FAQ’s

Got another question? Please reach out to us!
After 20 years of building homes in Sydney, we have built all sorts of homes and dealt with all planning, design and approval scenarios!

Yes. In fact, basements are a smart way to maximise usable space on challenging sites. We’ve successfully built basements on narrow streets, steep slopes, and rocky ground.

Yes. Homes with basements, especially those with secure parking and lifestyle features, will sell for a premium in Sydney’s competitive property market.

Most basements require a Development Application (DA). In some cases, a Complying Development Certificate (CDC) may be possible, but there are restrictions , such as height limits above the basement.

We over-engineer waterproofing and drainage systems, working closely with structural engineers to ensure long-term protection from water ingress.

Costs vary depending on excavation complexity, site access, soil conditions, and the intended use of the basement. We provide a detailed, fixed-price proposal once we’ve assessed your site and design.

This depends on council regulations, site conditions, and engineering requirements. Some projects allow for multiple basement levels, especially in multi-storey homes.

Absolutely. Many of our clients use basement space for gyms, saunas, wine cellars, cinemas, or extra storage, as long as it meets council requirements.

It’s possible, but more complex than including one in a new build. It usually involves significant excavation and structural modifications. We can assess feasibility during a site visit.

On narrow blocks or sites with tight access, a turntable allows you to drive in forwards and have the car rotate to face the exit, no reversing required.

The ideal time to plan a basement is at the very start of your home design process. This ensures the structure, engineering, and council approvals are all integrated into your build from day one, saving time and avoiding costly changes later.

Ready to Build Your Custom Home?

0423 652 812