Home Extensions in Illawarra
Your house is not working. You do not need to leave.
Build Up or Build Out? The Decision That Changes Everything
Before you spend a cent on design, you need to answer one question: do you extend at ground level, or add a second storey?
This decision affects your cost, your timeline, your council approval path, and how disruptive the build will be.
Get Expert Help From Adlington Homes
Sound Familiar?
- ✓Fighting the morning rush for one bathroom?
- ✓Living room noise stopping you from sleeping?
- ✓Cooking in a dark kitchen while guests are in the garden?
- ✓Dining table buried under laptops and homework?
Ways To Connect
Ways To Connect With Adlington Homes
Investment
How Much Does a Home Extension Cost in the Illawarra?
Honest ranges for 2026:
- ✓Ground floor extension (standard): $3,000–$4,000/m²
- ✓Second storey addition: $3,500–$5,000/m²
- ✓High-end extension (premium finishes, complex design): $4,500–$6,000+/m²
A typical rear kitchen/living extension of 40–60m² costs $150,000–$280,000 depending on complexity and finishes. A second storey addition of 80–120m² costs $320,000–$550,000. These figures include design, council approvals, construction, and standard landscaping reinstatement. They do not include furniture, removals, or temporary accommodation.
Decision Point
Which Direction Should You Build?
Build out (ground floor extension) if:
- ✓You have enough land to extend without breaching setbacks
- ✓You want single-level living (no stairs)
- ✓You want a strong indoor-outdoor connection
- ✓Your block is relatively flat
Build up (second storey addition) if:
- ✓You have run out of land
- ✓You want to keep your backyard
- ✓You want to capture views (ocean, escarpment)
- ✓You need significant extra space (3+ rooms)
We help you make this call during your free consultation. We look at your block, your council rules, and your budget before recommending a direction.
Our Work
Recent Home Extensions Projects
How It Works
Our Design-and-Build Process
Unlike hiring an architect and builder separately, we take responsibility for the budget from day one. This prevents the most common disaster in residential building: beautiful plans that cost twice what you expected.
- 01
Site meeting + feasibility — we inspect your block, check soil conditions, measure setbacks, and confirm what council will allow. Free.
- 02
Design development — we draft a layout that solves your specific pain points. You see it in 3D before committing.
- 03
Fixed-price quote — we give you a number that does not move unless you change the scope.
- 04
Council approval — we manage DA or CDC lodgement and respond to any council queries.
- 05
Construction — we build it. Regular updates, clean site, clear timeline.
- 06
Handover + warranty — keys, maintenance guide, and our Adlington Assurance guarantee.
Why Choose Us
Why the Illawarra Is Different
Extension builders from Sydney often underestimate Illawarra conditions:
- ✓Reactive clay soils near the escarpment swell and shrink with moisture. Foundations must be engineered for this.
- ✓Salt spray in coastal suburbs (Austinmer, Coalcliff, Wombarra) corrodes standard fixings within years. We specify marine-grade hardware.
- ✓Sloping blocks are the norm, not the exception. Most extensions need pier-and-beam foundations or cut-and-fill earthworks.
- ✓Stormwater is heavily regulated by Wollongong Council. Your extension cannot increase runoff to neighbours.
We know these conditions because we have been building in them for five decades. Not five years.
Secure Your Complimentary Design & Build Consultation
During this consultation, you will receive:
- Personalised Design Consultation
- On-Site Walk-Thru and Inspection
- Contractor Collaboration
- Detailed Selections Checklist & Comparison
- Preliminary Estimate and Budget Outline
- Project Timeline For Completion
- Access to our Trusted Partner Network
Guarantee
The Adlington Assurance
We guarantee that every aspect of your project will be completed to the highest standard of quality and craftsmanship.
If you're not completely satisfied with any aspect of the project, we'll work with you to make it right until you're completely happy.
FAQs
Frequently Asked Questions
How long does a home extension take?+
Ground floor: 4–6 months construction. Second storey: 6–9 months. Design and approvals add 3–6 months before construction starts.
Can I stay in the house during construction?+
For ground floor extensions, usually yes if we can seal off the work zone. For second-storey additions, we recommend moving out during the roof removal and framing stages (typically 6–8 weeks).
Do I need a Development Application?+
Not always. Many extensions fit within Complying Development (CDC), which is faster and cheaper. We assess this during feasibility.
Will the extension match my existing house?+
We match rooflines, eave details, window proportions, and cladding materials. If exact brick matching is impossible (common with discontinued bricks), we discuss alternatives like rendering or feature cladding.
What if my soil is reactive clay?+
We design the foundation for it. This typically means deeper piers or a waffle slab with appropriate stiffening. Our engineer specifies this based on the geotechnical report.
Realise Your Home's Potential
Unsure whether to renovate or rebuild in Wollongong? Take the first step towards your dream living space. Download our free "Illawarra Home Extension Inspiration Guide" for expert tips and concept design ideas. Then, book your no-obligation consultation with our experienced team. Let's work together to create the perfect extension for your Illawarra home.
From Coast to Countryside, We've Built It All
Whether your dream destination encompasses ocean breezes or pastoral charm, discover how our team can make your property vision a reality. For five decades, Adlington Homes have lent their expertise to diverse projects across the Illawarra and beyond.
- ✓Wombarra
- ✓Austinmer
- ✓Coalcliff
- ✓Scarborough
- ✓Thirroul
- ✓Bulli
- ✓Russell Vale
- ✓Woonona
- ✓Bellambi
- ✓Corrimal
- ✓Tarrawanna
- ✓Towradgi
- ✓Fairy Meadow
- ✓Albion Park Rail
- ✓Port Kembla
- ✓Shell Cove
- ✓Unanderra
- ✓Balgownie
- ✓Fernhill
- ✓Mount Ousley
- ✓Mount Pleasant
- ✓Gwynneville
- ✓Keiraville
- ✓North Wollongong
- ✓Wollongong
- ✓Mangerton
- ✓West Wollongong
- ✓Coniston
- ✓Figtree
- ✓Barrack Heights
- ✓Flinders
- ✓Kanahooka
- ✓Oak Flats
- ✓Warilla