Central Coast home extensions
More room for the life you already love.
Extend your Central Coast home with practical planning, clear communication and a licensed builder who understands how to connect new spaces to existing homes properly.
Extra bedrooms, better living zones, work-from-home space and more usable everyday flow.
Rear additions, side extensions, second-storey additions, kitchens, ensuites and alfresco areas.
Renovation and extension work across suburbs including Terrigal, Buff Point, Bateau Bay and Gorokan.
Why extend
Keep the address. Fix the home.
Moving can mean stamp duty, selling costs, compromise and leaving the neighbourhood you have already chosen. A well-planned extension can give you the space you need while improving how the existing home works.
Hemmens Building helps homeowners turn underused layouts into homes that feel considered, functional and ready for the next stage of family life.
What we build
Extension work shaped around your home, block and budget.
Open-plan living extensions
Expand kitchens, dining rooms and living areas so the heart of the home works harder every day.
Bedroom and master suite additions
Create space for growing families, guest accommodation, walk-in robes and ensuite bathrooms.
Second-storey additions
Add floor area when the block is tight, with attention to structure, weather protection and staging.
Side and rear extensions
Use available land more effectively while connecting new work cleanly into the existing home.
Alfresco and outdoor living
Build covered entertaining zones that suit Central Coast weather and make indoor-outdoor living easier.
Whole-home renovation tie-ins
Upgrade older areas while extending, so the finished home feels consistent rather than patched together.
Planning matters
Extensions are more complex than new blank-slate builds.
New work must meet the existing home cleanly. That means structure, rooflines, services, access, drainage, approvals and finishes all need to be understood before construction starts.
- Early budget guidance before drawings run too far.
- Practical advice on staging, access and disruption.
- Realistic allowances for finishes, consultants and approvals.
- Clear communication from first conversation to handover.
Our process
From first idea to finished extension.
Consultation
We talk through your goals, site, budget and timing so the next step is grounded in reality.
Design support
We can work with your architect or bring design support in early to keep buildability front of mind.
Detailed quoting
You get a transparent scope with realistic allowances, exclusions and assumptions called out clearly.
Approvals
We help coordinate the information needed for DA, CDC, engineering and certification pathways.
Construction
Your extension is managed by a licensed builder with clear updates and practical site coordination.
Handover
We finish the details, clean the site and hand over a home that is ready to use.
Budget clarity
What should you allow for?
Home extension costs vary because each existing home creates different structural, access and service requirements. As a practical starting point, meaningful ground-floor extensions on the Central Coast often start from around $250,000, with larger or more complex work requiring a higher budget.
Start with clarity
Ready to understand what your extension really needs?
A simple look at the experience clients have had with Hemmens Building.
The best time to talk is before the design, budget and scope have drifted apart. Bring the idea, the constraints and the questions. We will help you work through what is realistic and what the smartest next step should be.
“From the first point of contact we felt very much at ease.”
“Workmanship and quality is second to none.”
FAQs
Common home extension questions.
How much does a home extension cost on the Central Coast?
Ground-floor extensions commonly start from around $250,000-$300,000, depending on size, structure, access, finishes and whether kitchens or bathrooms are included.
Can I live in my house during the extension?
Often, yes. It depends on the scope, services affected, safety separation and how much of the existing home needs to be opened up.
Do I need council approval?
Most extensions need either a DA or complying development pathway. The correct route depends on your property, design, zoning and site constraints.
How long will my extension take?
Many extensions take around six months from site start to handover, while larger or more complex renovations can take longer.
What areas do you service?
Hemmens Building services the Central Coast, including Terrigal, Bateau Bay, Buff Point, Wamberal, Long Jetty, Gorokan and surrounding suburbs.
Ready to talk?
Start with a practical conversation about your home.
Bring your ideas, plans or questions. We will help you understand the likely scope, risks, budget considerations and best next step.
