Vetted, listed for free

Find Vetted Custom Granny Flat Builders in Your Area

A custom build offers ultimate flexibility. The first step is finding a local, licensed builder who understands your vision.

A custom build offers ultimate flexibility. The first step is to find a local, licensed builder who understands your vision. Select your state below to see who is active in your area.

Is it worth the premium?

The “Turnkey” Premium

Why a managed build costs more, and when that extra is money well spent.

You are paying for risk management

A custom builder charges a premium (typically a 20 to 30% margin), but that premium covers project management and risk: workplace safety, trade coordination and the mandatory 6-year structural warranty (Home Building Compensation Fund). If you are time-poor or inexperienced, this premium is often worth it.

Directory disclaimer: This is a curated list of Australian builders specialising in secondary dwellings, listed for free to help you start your research. We verify that businesses appear active and reputable, but The Granny Flat Guide does not endorse or guarantee their work. Do your own due diligence, check licences, and request insurance certificates before signing.

Granny Flat Solutions

Sydney / Coast

$$$

The most awarded granny flat builder in NSW. They specialize in high-end, bespoke designs and handle the entire CDC/DA process in-house.

Award WinningCustom DesignFull Approval

Cubitt’s Granny Flats

NSW Wide

Operating since 1994, Cubitt’s is one of the only builders serving regional NSW. Known for reliable, classic designs and fixed-price contracts.

Family OwnedCountry NSWClassic Styles

Backyard Grannys

Newcastle / Hunter

Newcastle’s dedicated specialist. They do not build main homes, only granny flats, ensuring focused project management.

SpecialistHunter ValleyFast Approvals

5 Star Granny Flats

Sydney Metro

Offers a massive display village in Seven Hills. Great for investors looking for standard, proven designs with fast turnaround times.

TurnkeyFast BuildShowroom

Rescon Builders

Sydney

Specialises in high-yield rental builds. They have a streamlined process designed to get tenants in faster.

InvestorsROI FocusStreamlined

Acrow Investments

Central Coast

Central Coast locals. They excel at difficult sites and sloping blocks that major volume builders often reject.

LocalSloping BlocksCustom

Premier Homes (Vic)

Bayswater

$$$

Market leaders in Dependent Person Units (DPUs). They have a large display village and offer high-end finishes.

DPU ExpertsDisplay VillageFamily Homes

Superior Granny Flats

VIC Wide

Offers both transportable homes and traditional slab-on-ground builds. Flexible options for difficult access sites.

RelocatableConcrete SlabCustom

Todd Devine Homes

Melbourne

$$$

High-quality transportable homes and granny flats. Popular for retirement living and holiday parks.

TransportableLifestyleRetirement

Dependable Granny Flats

Melbourne

Focuses on accessibility and elderly care designs. They manage the complex Victorian planning permit process.

Disabled AccessPermitsOne Stop

Willow Grove Homes

Mornington

Mornington Peninsula specialists. Beautiful weatherboard-style relocatable homes perfect for coastal blocks.

CabinsPeninsulaRelocatable

Granny & Co Homes

Brisbane

$$$

The premium choice for Brisbane. They use in-house architects to design stunning small homes that add real property value.

ArchitecturalCustomDesigner

Vision Granny Flats

Brisbane / GC

Strictly focused on ROI for investors. They build durable, low-maintenance flats designed to maximize rental yield.

InvestorsRentalsTurnkey

Superior Granny Flats QLD

SEQ Wide

Operating for over 30 years. A safe pair of hands for standard designs and reliable construction in SEQ.

30+ YearsExperienceReliable

Lifestyle Granny Flats

Brisbane

Known for modern, box-style designs with clever floor plans. Good for narrow blocks in inner-city Brisbane.

ModernFastStylish

The Granny Flat Experts

Sunshine Coast

Sunshine Coast locals. They understand the specific council overlays of the Noosa/Maroochy regions.

LocalCoastalPersonal

Granny Flats WA

Perth Metro

$$$

Perth’s leading custom builder. They excel at tight access sites and matching the granny flat to your main home.

CustomDifficult SitesPremium

Summit Granny Flats

Perth / SW

Part of the massive Summit Homes Group. Offers the security of a large builder with advanced steel frame technology.

Major BuilderSteel FrameReliable

Dale Alcock

Perth

$$$

The biggest name in WA building. They build high-spec masonry (brick) granny flats that feel like permanent homes.

MasonryQualityReputation

Classic Granny Flats

Perth

WA’s most experienced small home builder. They have a dedicated showroom in Joondalup.

ExperiencedShowroomRange

Fox Modular

WA Wide

$$$

Stunning architectural modular designs. Built in Gnangara and trucked to site. Very modern aesthetic.

ModularArchitecturalFast

Adelaide Granny Flats

Adelaide

$$$

South Australia’s premier custom builder. Known for high-quality brick veneer and rendered finishes.

CustomLocalQuality

Hurst Constructions

SA Wide

A family-owned business offering fixed-price contracts. Great personal service for first-time builders.

Family OwnedFixed PricePersonal

Austral Constructions

Adelaide

They specialize in traditional concrete slab construction, not transportables. Solid, permanent value.

Concrete SlabBrickSolid

Sarah Homes

SA Wide

Iconic SA brand. Famous for holiday homes and lifestyle shacks. They offer both build and kit options.

LifestyleHolidayKit/Build

Kookaburra Homes

Murray Bridge

The experts for regional SA. They build transportable homes perfect for farms and acreage.

RegionalTransportableRural

Tasbuilt Homes

Westbury

$$$

Tasmania’s leading modular builder. They build high-end homes in Westbury and deliver statewide.

PremiumModularStatewide

Rainbow Building Solutions

Sorell

Specialists in steel frame construction. They offer custom designs and handle the challenging TAS terrain.

Steel FrameCustomLocal

Cunic Homes

Hobart

$$$

A major Hobart builder offering bespoke architectural designs for small dwellings.

ArchitecturalHobartCustom

Prime Design

Launceston / Hobart

While primarily designers, they partner with trusted local builders to deliver the full package.

DesignDraftingPermits

Tasmanian Choice

Burnie

Serving the North West coast. Reliable local builders for traditional construction.

North WestLocalReliable

Avoid the trap

The “Prime Cost” Trap

The single most common way a fixed-price quote turns into a moving target.

Convert PC items to fixed allowances

Beware the Provisional Sum or Prime Cost (PC) item. Builders estimate low allowances for tapware, tiles and cabinetry to make a quote look attractive. If your real choice costs more, you pay the difference plus margin (around 20%). Ask for a detailed inclusions list, and convert PC items to fixed allowances based on real products. That turns a vague quote into a fixed price contract.

Don’t Start Building Without a Budget

Material costs and council fees shifted again in 2026. Avoid budget blowouts with our free granny flat feasibility calculator.

Estimate site costs (excavation, slab, crane)
Compare kit, modular and custom build types
Four-phase breakdown with instant results

Open the free cost calculator

Have a budget? Get free quotes to compare against your estimate.

Compare the alternatives

Weighing Up Another Build Method?

The right path comes down to your budget, timeline and how hands-on you want to be. Compare the other two options.

Prefab & Modular Homes

Factory-built and craned to site for speed and cost certainty.

Explore this option

DIY Kits

The owner-builder route. Save the builder margin on steel or timber kits.