DIY Class 1A Half Expander Cabins

Not enough space
for a full expander?

These particular units are for properties that don't have enough space for a full expander. We designed half expanders so your granny flat vision can still come true — the same WA-engineered quality, in a smaller footprint.

3 Models available
1–2 Bedroom layouts
From $45,000+GST Starting price
Cubby & Co Half Expander Half Expander

Cubby & Co

Our smallest half expander — a smart, self-contained footprint available in 1 or 2 bedroom layouts.

1-2 Bedrooms
1 Bathroom
1 Kitchen
6m*4.5m m² Floor area
2400mm Ceiling height
Ancillary Most Popular Half Expander

Ancillary

A step up in size, with 1 or 2 bedroom configurations and room to genuinely live in.

1-2 Bedrooms
1 Bathroom
1 Kitchen
9m*4.5m m² Floor area
2400mm Ceiling height
Little Lot Largest Layout Half Expander

Little Lot

Our biggest half expander — a spacious 1 or 2 bedroom layout for those who want a little more room.

1-2 Bedrooms
1 Bathroom
1 Kitchen
11.8m*4.5m m² Floor area
2400mm Ceiling height
Cubby & Co27sqm The Ancillary40.5sqm · Most Popular The Little Lot53.1sqm
Bedrooms 1–2 1–2
Bathroom 1 1
Kitchen 1 1
Floor Area 27m² 53.1m²
Ceiling Height 2400mm 2400mm
Best For Compact & entry-level Most room to move
Starting Price $45,000+GST $75,000+GST
View Detail View Detail

Not sure which size fits your block?

Tell us your block dimensions and what you need the space for, and we'll point you to the right half expander model — no guesswork required.

What's Included

Premium inclusions.
No hidden extras.

🏠

Premium as standard, not an upgrade

7-star energy rating, double glazing, a full window façade and stone benchtops come standard on every half expander — plus a full roof, 2m verandah and eco decking.

Half expander cabin interior
$4,500 Flat-fee shire approval assistance

One fixed, transparent fee — no hidden charges.

🌿

Council paperwork, handled

We work closely with our reliable council approval partner to guide your project through the shire application process, with an excellent success record across most WA councils.

NCC compliant, WA-tested

Double glazed windows and doors, AS3786-compliant smoke alarms, 40mm floor insulation and AS3000-standard electrics — every unit is built to the National Construction Code.

🛠️

Six years of WA engineering experience

We design cost-effective houses and self-contained granny flats tailor-made to match your living requirements and budget, with professional consultants collaborating daily with the Shire.

The Process

Design it. Plan it. Build it.

01

Plan and Sign up

We start the process with deposit and get you started on the approval pathway.

02

Owner builder's process

Complete the Owner builders course refer to the Owner builders guide.

03

Council approval Submission

we will organise Engineering, Soil Testing, BAL Assessments, Energy efficency and CDC by Building Certifier to get the builiding permit.

04

Building your Class 1A Primary or Ancillary dweling

We select the finishes and colours of your choice.

05

Delivered and Installed

we Deliver and install you Class 1A home, now you can live or rent out with peace of mind.

Get Started Today

Ready to
build your own?

Tell us your site details, household size and how hands-on you want to be — we'll match you to a half expander model and get back with a straight-up, no-obligation quote.

Customer Reviews

What people are saying about us.

Site-Ready // Get Quote

Time to lock it in

Tell us about your site and we'll recommend the right solution, size and layout — with a prompt, no-obligation quote.

  • Warranty2 Years
  • StandardAUS Compliant
  • DeliveryNationwide
  • Tried & tested by WA