How Much Does a Granny Flat Cost in Wollongong, the Shoalhaven & the South Coast? A 2026 Price Breakdown
- Jul 15
- 6 min read
Updated: 2 days ago
A quality standalone granny flat across Wollongong, the Illawarra, the Shoalhaven and the wider South Coast typically costs between $165,000 and $297,000 (including GST) in 2026, with compact studios starting from around $141,000.
At Wollongong Granny Flats, the cost question is the one we hear first — and it deserves a straight answer. Where you land in that range depends on the size you build, your site conditions, the finish level, and the extras you choose. Below, we break the number down factor by factor, so you can see what actually drives the price on your block and what you can do to keep it down.
How much does a granny flat cost by size in Wollongong and surrounds?
These are indicative 2026 bands for a turn-key build on a straightforward block. All prices include GST.
Size | Typical use | Indicative cost (turn-key, incl. GST) |
Studio (30–35 m²) | Home office, breakout space, entertaining | $141,000 – $176,000 |
1-bedroom (45–60 m²) | Couple, rental, ageing parent | $165,000 – $275,000 |
2-bedroom (49–60 m²) | Family member, higher rental yield | $171,000 – $292,000 |
3-bedroom (58–60 m²) | Larger family living | $188,000 – $297,000 |
(Indicative 2026 granny flat cost ranges by size in the Illawarra, Wollongong, Southern Highlands and Shoalhaven)
In NSW, the internal living area of a granny flat (a "secondary dwelling") is capped at 60 m². A "3-bedroom" means a clever 60 m² layout — patios, decks, alfrescos and carports sit outside that cap.
What's included in the price?
Different builders quote very different numbers for "the same" granny flat because they include very different things. A Wollongong Granny Flats turn-key project is genuinely complete — the design, the approvals and a finished, ready-to-live-in home, not a shell with a long list of extras to chase later. At Wollongong Granny Flats, every build includes:
The full design and approvals package — surveys, engineering, energy (BASIX) certification, colour selections, and the preparation and management of your CDC or DA application from start to finish.
An engineered slab and structure — designed to suit your block, including sloping and flood-affected sites.
A complete, weather-tight exterior — quality cladding, a Colorbond steel roof, insulation, windows and doors, a rainwater tank and a continuous-flow hot water system.
A fully finished interior — a complete kitchen with quality cabinetry and appliances, a tiled bathroom and internal laundry, built-in robes, flooring throughout, painting, and full electrical.
The finishing touches — access steps, internal and external painting, and a full builders' clean inside and out.
You receive the complete itemised specification during your consultation, so you know exactly what you're getting before you sign — down to the brand and model of each item.
Related reading: Explore our range of granny flat designs →
Upgrades: how much you spend is up to you
The turnkey price buys a complete home. From there, you can add enhanced features that boost functionality and comfort, or luxury fittings that elevate the look and feel — most clients do a mix of both.
Element | Standard (included) | Enhanced — more features | Luxury — premium fittings |
Kitchen benchtop | Laminate | Stone benchtop | Premium stone |
Appliances | Oven, gas cooktop, rangehood | Dishwasher added | Premium appliance package |
Bathroom | Tiled shower, quality fittings | Floor-to-ceiling tiling, shaving cabinet | Designer tapware, full-featured tiling |
Heating & cooling | Ceiling fans | Split-system air-conditioning | Ducted air-conditioning |
Ceilings | Flat ceiling | Square set cornice | Raked / cathedral ceiling |
Flooring | Tiles/timber throughout | Upgraded flooring throughout | |
Outdoor & extra | Access steps | Alfresco | Alfresco plus a matched garage |
Moving from the included specification to an enhanced or premium finish typically adds $16,500–$33,000 (incl. GST). Luxury selections can go beyond that — there's effectively no ceiling if you want the highest-end finish. A popular addition is an outdoor alfresco, priced from around $6,600 to $49,500 (incl. GST), depending on size and design.
What affects the cost: your site
Once the build is out of the ground, costs are largely predictable. It's getting out of the ground — the earthworks — that carries the unknowns, and that's where cheap phone quotes come unstuck.
The main site-cost drivers are:
Slope and rock — a sloping or rocky block needs engineered footings.
Flood-affected — flat blocks needing piers, which adds high costs, generally more than $25,000.
Access — narrow side access or no rear lane pushes up labour and craneage costs.
Service connections — running sewer, stormwater, water and electrical to the new dwelling.
Hazard overlays — flood, bushfire (BAL) or acoustic requirements add compliance cost and can push you onto the slower DA pathway.
Because of these unknowns, we build a contingency figure into your proposal and walk you through it clearly before you sign off. That figure isn't a guess — it's an informed estimate based on our 100+ years of collective construction experience and the six years we've focused solely on designing and building granny flats in this region.
CDC vs DA: your approval pathway
Your approval route affects both your timeline and your budget.
Complying Development Certificate (CDC) is the fast pathway. If your block is at least 450 m², in a residential zone, and your design meets the Housing SEPP standards, a private certifier can approve the build — often within about 10–20 business days — without going to council. The vast majority of straightforward Illawarra and Shoalhaven blocks qualify.
Development Application (DA) is the fallback for heritage, flood, and bushfire issues, as well as for undersized or non-standard sites. It takes longer (often 40–90 days) and adds consultant and assessment costs — talk to us to find out more.
As a granny flat building specialist set up to handle both CDC and DA in-house, we can move either way efficiently and keep your costs down.
Learn more: CDC vs DA — what's the difference? →
What it costs in your area
The build itself is consistent wherever we work, but local block conditions shift the final figure from region to region.
Wollongong & the Illawarra — blocks below the escarpment are often sloping or rocky, and established suburbs can have narrow access. Newer estates around Shell Cove, Albion Park and Calderwood are flatter and more CDC-friendly.
Shoalhaven — around Nowra, Bomaderry, Berry and the Jervis Bay villages, bushfire (BAL) and flood overlays are the variables to watch, and can lift the specification or trigger a DA.
Ulladulla & Milton — similar coastal and bushfire considerations, with Milton's heritage main street a factor nearby.
Southern Highlands — the cooler climate makes the 7-star energy requirement more demanding, and heritage areas such as Berrima more often need a DA.
In every region, the principle is the same: the only accurate price is one based on an assessment of your actual block.
How do we give you price certainty?
We're upfront about what we can and can't lock in. For the above-ground build, based on a detailed consultation and a signed agreement, Wollongong Granny Flats provides a fixed price for that scope of work. Below-ground work — where there can be genuine unknowns under the soil — is covered separately by the contingency figure. And if you choose to make changes once the build is underway, those variations are agreed with you and costed separately before we proceed. That way, you get real price certainty on the bulk of the build, without the surprises that come with a headline number quoted sight-unseen.
Frequently asked questions
How much does a granny flat cost in Wollongong in 2026? A turn-key granny flat typically costs $165,000 to $292,000 (including GST) for a one- to two-bedroom build, with compact studios from around $141,000. The final price depends on size, site conditions and finish level.
What's the cheapest granny flat I can build? Usually a studio or compact one-bedroom on a flat, easily accessible block using the CDC pathway — typically from around $141,000 (including GST).
Does the price include approval and design? Yes — our turn-key price includes design, documentation and approval management. Always check this, as some builders quote the build only and leave approvals to you.
How big can a granny flat be? In NSW, the internal living area is capped at 60 m². Patios, decks, alfrescos and carports don't count toward that limit.
Can I rent it out? Yes. In NSW, a secondary dwelling can be rented to anyone — it doesn't have to be a family member — making granny flats a popular income-generating strategy across the Illawarra and Shoalhaven.
How long does it take to build? For a CDC approval on an accessible, flat site with everything signed off, we can typically complete a build in around 12 weeks.
Get started with Wollongong Granny Flats
At Wollongong Granny Flats, we:
Handle end-to-end design, approvals and construction
Offer a fixed price for the above-ground build, with a clear, itemised contingency for below-ground work
Have in-house specialists for CDCs, council requirements and compliance
Build across Wollongong, the Illawarra, the Shoalhaven, Ulladulla, the Southern Highlands and the Sutherland Shire
Final word
The only way to know what your granny flat will cost is to have someone assess your actual site and requirements — and it starts with a hassle-free chat. Reach out today, and we'll give you a real price for your block.
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