When you need more space at home, you might first consider building out into the backyard or adding a second storey. But there’s another option that often goes overlooked.
A basement addition to an existing house lets you expand without sacrificing outdoor space, while also boosting your property’s value.
Below we’ll explore the benefits of basements and the step-by-step process for preparing your site.
Why Choose a Basement?
There are many advantages to adding a basement:
- It creates valuable extra space without reducing your outdoor area.
- You can extend under the backyard to make the space even larger.
- Basements add significant real estate value, helping your property stand out in a competitive market.
- They generally need less heating and cooling, reducing energy costs.
- They’re versatile – perfect for extra bedrooms, a home gym, cinema, or living area.
Step One: Understand the Regulations
Before digging begins, you must confirm and follow local building rules.
- Secure the right permits from your local council and relevant authorities.
- For Sunshine Coast projects, ensure compliance with Sunshine Coast building guidelines.
- Review Australia’s building codes covering safety, accessibility, energy efficiency, and structural standards.
Step Two: Assess and Prepare the Site
A detailed site assessment is crucial to success. Consider:
- Soil type: Different soils affect excavation and stability.
- Groundwater: Poor drainage can lead to flooding if not managed properly.
- Obstacles: Old septic tanks, tree roots, or underground utilities may need removal or relocation.
Step Three: Design Your Basement
Plan how the basement will function before construction begins. Think about:
- Layout: Decide whether it will be living space, storage, or both. Adding a basement to a home with a crawl space may also be possible.
- Lighting: Use windows, skylights, mirrors, or smart lighting for brightness.
- Insulation: Improve temperature control and reduce noise transfer.
- Ventilation: Prevent dampness and mould with proper air circulation.
- Finishes: Choose flooring, paint, and furniture early to guide construction decisions.
Planning early will also help estimate your basement extension cost.
Step Four: Choose Construction Materials
Materials impact durability, performance, and budget. Common options include:
- Concrete: Durable, strong, and highly versatile.
- Steel: Ideal for areas with soil movement or high groundwater.
- Timber: A budget-friendly choice for sloping blocks, if rot-resistant varieties are used.
Step Five: Drainage and Waterproofing
Australian weather means water management is essential. Invest in:
- A strong waterproofing barrier to protect against leaks.
- Drainage systems designed around site conditions and budget to keep the basement dry.
Step Six: Begin Construction
Once planning and preparation are complete, construction can commence.
- Excavation: Carried out to the correct depth and dimensions by expert basement excavation contractors.
- Foundation: Typically a concrete slab, piers, or piles depending on the site.
- Walls and Framing: Built with appropriate insulation and waterproofing for a safe, liveable space.
- Finishing: Add paint, flooring, and interior details to complete your new basement.
Looking for Basement Excavation on the Sunshine Coast?
Fraser Earthworks & Co has over 18 years’ experience in basement excavation. We’re 100% Australian-owned, offering professional services at competitive rates.
Call us on (07) 5445 9765 or request a quote via our Get Quote Now form to get started on your basement project today.
