Class 10 vs Class 1a Structures in Canberra

The Complete Guide to Use, Approval, and Property Value

If you're planning to build a studio, shed, garage, or backyard structure in Canberra, understanding whether it is a Class 1a or Class 10 building is critical.

This decision affects:

What you can legally use the space for

Whether it can be rented

The approvals required

And most importantly — how much value it adds when you sell

What is a Class 1a Building?

A Class 1a building is a habitable residential dwelling under the National Construction Code (NCC).

Common examples:

Houses

Secondary residences

Granny flats

Backyard studios (approved for living)

Sleepouts

Simple definition:

A Class 1a building is designed for people to live in.

What is a Class 10 Structure?

A Class 10 structure is non-habitable.

Common examples:

Sheds

Garages

Carports

Workshops

Pergolas

Storage buildings

Simple definition:

A Class 10 structure is designed for storage, work, shelter, or support — not living.

The Core Difference: Habitable vs Non-Habitable

This is the most important concept:

	Class 1a	Class 10
Purpose	Living	Storage / work / support
Habitable	Yes	No
Can be rented for living	Yes	No
Recognised as living area	Yes	No

If a space is used for sleeping, living, or renting — it must meet Class 1a requirements.

Can a Class 10 Have a Bathroom or Kitchen?

Yes — and this is where many people get confused.

A Class 10 structure can include basic facilities, such as:

Toilet

Sink

Shower

Simple kitchenette

For example:

A workshop with a bathroom

A shed with a sink or small kitchen area

These can still be Class 10, provided the building is not used as a dwelling.

The Key Rule

It’s not what you put in the building — it’s how the building is intended to be used that determines its classification.

The moment a structure is designed or used for:

Sleeping

Full-time living

Independent accommodation

…it will typically be treated as a Class 1a building

Why This Matters in Canberra

In the ACT, classification impacts:

Development approval pathways

Building approval requirements

Energy efficiency (EER) standards

Fire safety and compliance

Ventilation, ceiling heights, and amenity

Class 1a buildings must meet significantly higher standards than Class 10.

The Financial Difference: What It’s Worth When You Sell

Class 1a = High Value Uplift

A compliant Class 1a structure:

Can be marketed as additional living space

Can generate rental income

Is recognised by valuers and lenders

Appeals to buyers and investors

This typically results in a significant increase in property value

Class 10 = Limited Financial Return

A Class 10 structure:

Is treated as ancillary space only

Cannot be marketed as a bedroom or dwelling

Has limited rental potential

Carries less weight in valuations

It improves usability — but does not deliver the same financial return

The Most Common Mistake

Many people try to build:

A “studio”

A fitted-out shed

A backyard room

…while keeping it classified as Class 10 to reduce cost.

The reality:

If it functions like a living space, it will likely be assessed as Class 1a — regardless of what it’s called.

This can lead to:

Compliance issues

Retrospective approvals

Costly upgrades

Problems when selling or renting

Grey Area Structures

Some structures can fall into either category depending on design and use:

Sunrooms and enclosed alfrescos

Backyard studios

Converted garages

Workshops with amenities

Sheds with internal fit-outs

Enclosed verandahs

Pool houses

Key rule:

If the space becomes enclosed, comfortable, and used regularly for living — it is generally treated as Class 1a.

Simple Rule of Thumb

Storage, work, cars → Class 10
Living, sleeping, renting → Class 1a

Choosing the Right Approach

Before designing your project, ask:

Will anyone sleep here?

Could this be rented in the future?

Do I want this counted as living space when I sell?

If yes — you should be planning for Class 1a from the start.

Canberra-Specific Insight

In the ACT, classification issues are often identified during:

Property sales

Building inspections

Bank valuations

Misclassified structures can reduce value or delay transactions.

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Can I convert my garage into a bedroom in Canberra?

Is a backyard studio Class 10 or Class 1a?

Can I live in a shed in the ACT?

Do I need approval for a granny flat in Canberra?

Scenario: Class 10 Studio vs Class 1a Structure (Tuggeranong Example)

John and Mary live in Tuggeranong and want to add a backyard studio to their property.

They have two options:

Option 1: Class 10 Studio (Non-Habitable)

They build a well-finished studio as a Class 10 structure:

Insulated and lined

Includes a bathroom and small kitchenette

Used as a home office and occasional guest space

Outcome:

Cannot be legally rented as a dwelling

Not recognised as additional living space in valuation

Adds lifestyle benefit, but limited resale uplift

When they sell, agents market it as a "separate studio" or "workshop", not a dwelling.

Option 2: Class 1a Structure (Habitable)

They instead design and approve it as a Class 1a dwelling:

Fully compliant for living

Meets energy efficiency and building standards

Approved for use as a secondary residence

Outcome:

Can be legally rented (long-term or short-term, subject to ACT rules)

Recognised by valuers as additional living space

Appeals to investors and multi-generational buyers

When they sell, it can be marketed as a secondary dwelling or rental asset.

The Difference in Result

Both buildings may look similar physically.

But the outcome is very different:

	Class 10 Studio	Class 1a Structure
Legal use	Non-habitable	Habitable dwelling
Rental income	Not permitted	Permitted
Valuation impact	Low–moderate	Moderate–high
Buyer appeal	Lifestyle only	Investment + lifestyle

Key Insight

The classification determines the outcome — not how good the building looks.

John and Mary’s decision at the start determines whether their project becomes:

A useful extra space, or

A true income-producing asset

Final Thought

This isn’t just a technical detail — it’s a property strategy decision.

The difference between Class 1a and Class 10 is often the difference between a usable asset and a missed opportunity.

Need Help Getting It Right?

If you're planning a build in Canberra, getting the classification right early will:

Avoid compliance issues

Maximise rental potential

Increase resale value

We help homeowners design projects that align with:

ACT requirements

Correct building classifications

Long-term investment outcomes

Class 1a vs Class 10 – Tuggeranong Scenario (Full Detail)

The Client Scenario (Starting Point)

John and Mary own a 4-bedroom, 2-bathroom home in Tuggeranong, currently worth around $1,000,000.

They are not investors. They are typical homeowners thinking about the future.

Over the next 10 years, their needs are likely to change:

Their kids are getting older

They may want more separation and independence at home

Family or friends may need somewhere to stay

They want flexibility without moving

At the same time, they know they will likely sell the property in about 10 years, so any decision they make now needs to also make sense financially at sale.

Their thinking is simple and very common:

“If one of the kids wants to move in there, it’s an option. Friends can stay — it just gives us flexibility.”

So this is not just about building a structure.

It is about:

Creating flexibility now

Avoiding the need to move early

Positioning the property for a stronger result when they sell

They decide to build a ~40m² backyard studio on a concrete slab — something that feels like a small, independent space.

At this point, they face a decision they don’t fully realise the impact of:

Should they build it as a Class 10 structure to keep costs down, or as a Class 1a structure to maximise long-term value?

Immediate Value Impact – Class 10 (What Most People Do)

They choose a Class 10 structure to keep costs down.

Build cost: $150,000

Market recognises partial value

Property moves from:

$1,000,000 → ~$1,100,000

Immediate uplift: ~$100,000

Growth Over 10 Years – Class 10

Assuming 5% growth:

$1,100,000 → ~$1,790,000

Growth: ~$690,000

Immediate Value Impact – Class 1a (Alternative)

If instead they build as Class 1a (approved living space):

Build cost: $220,000

Property moves from:

$1,000,000 → ~$1,250,000

Immediate uplift: ~$250,000

This reflects:

5–6 bedroom equivalent

3 bathrooms

Second kitchen

Additional living space

Broader buyer appeal

Growth Over 10 Years – Class 1a

$1,250,000 → ~$2,040,000

Growth: ~$790,000

The Real Scenario (What They Actually Built vs What They Could Have Built)

Option 1: Class 10 Studio

~40m² on slab

Kitchen, shower, toilet

Not approved as dwelling

Treated as non-habitable

Buyers see:

4-bedroom, 2-bathroom home + shed with extras

Option 2: Class 1a Structure

Same ~40m²

Fully approved

Recognised as living space