Brett Field
A Jack and Jill bathroom is one bathroom shared by two bedrooms, with a door from each bedroom straight into it. It is worth it when the same two people use those rooms for years, like two kids, and in Queensland it has to meet the 2022 National Construction Code rules for the doors, the exhaust fan and the waterproofing.
Below are the pros and cons, the layouts that work, the doors and locks, and the Queensland rules if you are adding one. The rules are a short summary, not legal advice.
What is a Jack and Jill bathroom?
It is a bathroom with two doors, each one opening from a different bedroom. Neither room owns it the way a main bedroom owns an ensuite, and there is usually no door from the hallway.
It sits between the two bedrooms, often along the wall they share. Inside, it has what any bathroom has: a shower or bath, a toilet and a basin. Many have two basins, so two people can get ready at the same time.
| Type | Who uses it | Doors |
|---|---|---|
| Ensuite | One bedroom | One door, from that bedroom |
| Jack and Jill bathroom | Two bedrooms | Two doors, one from each bedroom |
| Main bathroom | The whole house | One door, from a hallway or living area |
Add a third door from the hall and it becomes a main bathroom with extra doors, and three locks to manage.
What are the pros and cons of a Jack and Jill bathroom?
The main plus is that two bedrooms each get a bathroom right next door, without building two ensuites. The main minus is privacy. Two doors means two locks to remember, and one person in the shower can hold up two rooms.
| Pros | Cons |
|---|---|
| Both bedrooms get a bathroom without walking the hall | Two doors to lock every time, and to open again after |
| One bathroom to build instead of two ensuites | Mornings can clash when both rooms want it at once |
| Two basins let two people use it together | Each bedroom gives up wall space for a door |
| Takes pressure off the main bathroom | Fan noise and light can reach both bedrooms |
Most of the cons come back to the doors and locks.
Is a Jack and Jill bathroom worth it?
It is worth it when the same two people will use both bedrooms for years, and the other choice is two ensuites or a walk down the hall. It is a weaker choice when one of the rooms changes use often.
It tends to suit:
- two kids or teenagers on the same floor
- two guest bedrooms side by side
- an upstairs level that has bedrooms but no bathroom
It suits less well when:
- one room is for guests and the other is a teenager's room
- the bedrooms are small, and a second door would leave nowhere for the bed or wardrobe
We found no published Australian figure on what a Jack and Jill bathroom does to a home's value, so we will not guess. Decide on how your household will live with it.
What layouts work for a Jack and Jill bathroom?
Three layouts cover most homes. Which one fits depends on the floor space and how private you want the shower and toilet to be.
| Layout | How it works | Suits |
|---|---|---|
| One shared room | Both doors open into one room with the shower, toilet and basin or basins | Smaller spaces and younger kids |
| Split vanities | Each bedroom opens into its own basin area, with a shared room between them for the shower and toilet | Teenagers, and homes with more floor space |
| Separate toilet | One shared room, with the toilet behind its own door | Two people getting ready at once |
Place the doors so they do not swing into each other, the shower or the toilet. Cavity sliding doors help here, because they slide into the wall and take no floor space. Our guide to door installation cost has prices for cavity sliders.
Ask a plumber early where the drains can run. That can decide the layout.
Which way should the doors open in a Jack and Jill bathroom?
Each door should slide, open out into the bedroom, or be easy to take off from outside, unless there is enough clear space inside. The building code calls any room with a toilet a "sanitary compartment", and NCC 2022 Housing Provisions 10.4.2 sets the rule for its door.
A door that swings into the room is only allowed if there is a clear space of at least 1.2 m between the toilet and the doorway. The code says the aim is a way of "removing an unconscious occupant" from the room. With two doors, check both. If the toilet sits behind its own door inside the bathroom, the rule applies to that door as well.
For locks, fit a privacy set on both bedroom doors, ideally one that can be opened from outside in an emergency. The habit that makes a Jack and Jill work is simple: lock both doors when you go in, and open both again when you leave.
Does a Jack and Jill bathroom need a window or an exhaust fan?
It needs one or the other. NCC 2022 Part 10.6 lets a bathroom be ventilated by a window or opening of at least 5% of its floor area, or by an exhaust fan. A 6 m2 bathroom, for example, needs 0.3 m2 of window that opens.
If your Jack and Jill sits between the bedrooms with no outside wall, there is no window to use, so plan on a fan. The code has a narrow rule for borrowing air through the room next door, and it has limits for rooms with a toilet. Your certifier can say whether it applies.
The NCC 2022 exhaust rules say:
- a bathroom fan must move at least 25 L/s
- it must exhaust to outdoor air, directly or through a shaft or duct
- in a bathroom without a window that meets the 5% rule, a fan that does not run all the time must switch on with the light and keep running for 10 minutes after it goes off
- a bathroom without that window also needs make-up air, such as openings to the next room with a free area of 14,000 mm2
The code's own note says a 20 mm gap under a 700 mm wide door gives that 14,000 mm2. Your electrician and certifier will confirm what works for your room.
What are the waterproofing rules for a Jack and Jill bathroom in Queensland?
The same as for any bathroom. The shower floor and walls must be waterproof, and the rest of the floor must be water resistant on concrete or fully waterproof on timber. Queensland still uses the 2022 code here. Business Queensland says the 2025 code will not start in Queensland until 1 May 2027.
NCC 2022 Part 10.2 sets these rules:
- the shower floor must be waterproof, including any hob or step-down
- the shower walls must be waterproof to at least 1,800 mm above the floor
- joins in the shower walls must be waterproof for at least 40 mm either side
- outside the shower, a concrete or fibre-cement floor must be water resistant
- a timber floor, including particleboard and plywood, must be waterproof across the whole room
- the joins between the walls and floor must be waterproof
The timber floor rule matters for a bathroom built upstairs on a timber floor. Waterproofing is its own QBCC licence class in Queensland. For prices and the full wet area rules, see our guide to bathroom waterproofing cost in Queensland.
Do I need approval to add a Jack and Jill bathroom in Queensland?
Often not for the building work, if it stays inside the house and leaves the structure alone. The plumbing still has to be registered. A building certifier has the final word for your house.
- Building approval. Under the Building Regulation 2021 (Schedule 1, section 7), alterations to a house do not need building approval unless they change the floor area or height, affect a structural part (beyond some minor ones), or affect the fire safety system. A bathroom carved out of a bedroom with new non-load-bearing walls can fit. Taking out a load-bearing wall or building an extension does not.
- Change of use. The City of Gold Coast says a change of use needs building approval even when no building work is done. Its example is a garage turned into a bedroom.
- Plumbing. The QBCC lists bathroom renovations and new or moved toilets, showers and basins as notifiable work. That means no council permit, but the plumber must register the work with the QBCC within 10 business days of invoicing.
- Licences. Building work over $3,300 needs a QBCC licensed contractor. Plumbing and drainage need a licence at any value. Electrical work needs a licensed electrician, says the Electrical Safety Office.
How much does it cost to add a Jack and Jill bathroom?
Expect it to cost at least what a new ensuite costs, since it is much the same work plus a second door. Our guide to ensuite renovation cost has the published price ranges for adding an ensuite and renovating one.
The price moves most with what has to be built new: the walls, the drains, the fan duct, a second basin and the second door. Ask for each one on its own line, so the quotes compare.
For deposits, the QBCC caps them at 10% for jobs of $3,301 to $19,999, and at 5% from $20,000.
We renovate bathrooms and ensuites across the Gold Coast, including the strip-out, the framing for new walls and hanging the doors. We book licensed trades for the plumbing, electrical and waterproofing, and give you a timeline with the proposal. See our bathroom renovations page.
Where does this information come from?
Checked on 12 October 2026: the National Construction Code 2022 Housing Provisions from the Australian Building Codes Board (Part 10.2 wet area waterproofing, Part 10.4 facilities, Part 10.6 ventilation, Part 10.8 condensation management and the glossary), Business Queensland on the NCC 2025 delay (updated 14 September 2026), the Building Regulation 2021 (Qld, current as at 14 August 2026), the City of Gold Coast (do your building works need approval, undated), the QBCC (when you need a licence, reviewed August 2021; waterproofing licence class, August 2021; notifiable work, February 2024; deposits, June 2025) and the Electrical Safety Office (DIY electrical work, undated). We will check these rules again every three months.
See our bathroom renovations work, or check what your job will cost.
