Plan a bathroom renovation by fixing the brief and risk investigations first, then resolving the layout, services, ventilation and waterproofing before choosing decorative finishes. Convert those decisions into measured drawings and a product schedule, obtain comparable quotes, confirm approvals and licences, and only then lock procurement and a construction sequence.
For a location-specific example, see Bathroom Renovation Costs in Adelaide: Real Prices, Real Timelines.
This order matters because bathroom elements are interdependent. Moving a vanity can change plumbing and power; a shower screen affects circulation; tile thickness affects finished levels; a fan needs a viable duct route. Selecting products before testing these relationships can create redesign, delays and avoidable cost.
Start with the reason for renovating
Write down what is wrong with the current room and what the finished room must do. Separate functional problems from appearance. Leaks, poor ventilation, unsafe access and insufficient storage deserve a different response from dated colours.
Identify the likely users over the next several years. A family bathroom may need a bath, robust storage and easy cleaning. An ensuite may prioritise two-person routines. A room intended to support ageing at home may benefit from safer circulation, strong fixing zones and reduced thresholds, even if specialised fittings are not installed now.
A useful brief includes:
- Who uses the bathroom and at what times.
- Which current features work and should remain.
- Must-have fixtures and storage capacity.
- Cleaning, privacy, ventilation and lighting priorities.
- Maximum funds available, including contingency.
- Any deadline and the reason it cannot move.
Keep the brief to one page. It should guide choices, not become a collection of inspiration images. The Australian Government’s Your Home renovation guidance recommends analysing the existing home and defining needs before committing to an addition or renovation. The same discipline is valuable in a bathroom.
Measure the existing room and record what is known
Measure wall lengths, ceiling height, door and window openings, sill height, bulkheads and visible fixtures. Mark the direction and clear opening of the door. Note power points, switches, exhaust outlet, floor waste, toilet connection and access panels without opening regulated services.
Take wide photographs and detailed photographs of junctions, cracks, staining and previous repairs. Gather available house plans, plumbing information, strata drawings, product records and approval documents. Existing drawings are clues, not proof that the building was constructed exactly as shown or remained unchanged.
Record floor construction if reliably known: concrete slab, suspended timber or another system. Do not guess concealed pipe routes or declare a wall non-structural from appearance. If layout changes depend on those facts, arrange appropriate investigation.
Create an existing-condition plan
A simple scaled plan is better than measurements spread across messages. Include a reference dimension so a professional can check scale. Add an elevation for each wall when niches, windows, mirrors or full-height cabinets are proposed. Keep “confirmed”, “reported” and “unknown” information visibly separate.
Investigate moisture and hazardous-material risks
Staining, swollen skirtings, loose tiles, musty odours and soft flooring may indicate water damage, but they do not diagnose the source. A failed seal, leaking pipe, shower-screen detail, roof issue or waterproofing defect can produce overlapping symptoms. Investigate before covering the room with new finishes.
Older bathrooms need hazardous-material awareness before drilling or demolition. The national asbestos guidance for householders and renovators notes that homes built or renovated before 1990 may contain asbestos. Do not rely on visual identification or take an uncontrolled sample; use competent assessment and comply with local testing, removal and disposal rules.
Put unresolved risks into the budget and programme. If demolition is needed to confirm substrate condition, define who decides and prices repair once the area is safely exposed. This is more credible than assuming every hidden surface is sound.
Set a complete budget before refining the design
Begin with a scope-based range. The bathroom renovation cost guide separates demolition, plumbing, electrical work, waterproofing, tiling, fixtures, joinery and finishing. A standard complete bathroom may need a very different budget from a cosmetic refresh that does not disturb the wet-area system.
Divide funds into construction, products, professional and approval costs, temporary arrangements and contingency. Show GST assumptions. Keep optional upgrades separate from the base scope so they can be removed without weakening essential work.
Contingency should respond to uncertainty. An older bathroom with leaks and no records may need a larger reserve than a recent room with clear documentation. Do not spend contingency during product selection; preserve it for risks until investigation reduces them.
Test layout options against real circulation
Draw the room to scale and place exact fixture dimensions, not generic icons. Mark room-door and shower-door swings, vanity drawers, toilet projection and standing space. A layout can fit geometrically while feeling cramped when moving parts overlap.
Start by testing a retained-services option. Keeping the toilet waste, shower drain and water points near existing workable locations can control cost and reduce construction risk. Then test one or two alternatives that solve genuine problems. Avoid moving every fixture merely to make the plan look new.
For a compact room, use the principles in the small bathroom cost model to understand why custom products and service relocation can outweigh floor-area savings. Wall-hung fittings, pocket doors and custom joinery may help, but each adds its own structural, access or maintenance questions.
Full-size testing catches paper-plan mistakes
Mark fixture outlines on the existing floor with removable tape, or mock up key dimensions in another space. Sit, reach, bend and open doors. Test towel access and the route from shower to doorway. Include the needs of shorter, taller and less-mobile users rather than designing around one person.
Coordinate plumbing before products are ordered
Have an appropriately licensed plumber review the preferred layout, existing services and exact fixture specifications. Confirm whether drainage falls, pipe sizes, hot-water capacity, water pressure and access support the design. A short move on plan can be difficult through a concrete slab or finished room below.
Record rough-in requirements for each product: centre lines, outlet type, in-wall bodies, cistern access, waste position and fixing support. Concealed components should remain maintainable after completion. Do not close a wall around a proprietary part without understanding access and replacement implications.
Product selection and service design should progress together. A basin, tap and vanity must be compatible; a bath needs a practical fill and waste arrangement; a shower head needs suitable pressure and location. Keep model numbers in the schedule so trades are not working from “similar” products.
Plan electrical work and ventilation as one system
List general lighting, mirror lighting, power, exhaust, heating and any fixed mirror or cabinet equipment. A licensed electrician should confirm the design, location constraints, circuit capacity and required work. Homeowners should not perform regulated electrical installation or disconnection.
Choose an exhaust strategy based on the room and duct route, not only a fan’s headline rating. Document where air enters, where moist air discharges and how the duct avoids restrictions. External penetrations can affect weatherproofing, appearance, strata common property or approvals.
Natural light and an opening window can be useful, but they may not replace mechanical ventilation required for the project. Confirm current NCC and jurisdictional requirements with the qualified people responsible. Lighting should support safe movement and face visibility without relying on a single harsh ceiling source.
Design waterproofing and falls before tile selection
Waterproofing is an integrated wet-area system, not a coating added after other decisions. The substrate, shower configuration, floor waste, falls, thresholds, corners, penetrations, membrane and finishes need compatible detailing. A linear drain, recessed shower or niche affects more than appearance.
Requirements and licensing vary across Australia. As a Victorian example—not a national administrative rule—the Building and Plumbing Commission’s waterproofing guidance explains the need for wet areas to comply with the NCC and referenced standards. Confirm the applicable pathway, responsible practitioner, inspections and certificates for the property’s jurisdiction.
Do not encourage unlicensed or non-compliant DIY waterproofing. Agree how preparation will be assessed after demolition, who repairs unsuitable substrates and what evidence will be kept before tiling. Product data, batch information, photographs and inspection records can support future maintenance even where a specific certificate format is not required.
Select products in dependency order
Choose items that affect rough-in and framing first: toilet system, bath, shower fittings, in-wall tap bodies, vanity and basin. Next confirm shower screen configuration, drainage, mirror cabinet and fixed electrical items. Decorative accessories and paint can follow later.
For every product, record brand, model, size, finish, quantity, supplier, lead time and required accessories. Add a status column: proposed, approved, ordered, received and checked. A picture or colour name is not enough to install from.
Check stock and inspect delivered items before they are needed. Delaying demolition until critical in-wall parts are available can protect the programme. Store products securely and retain packaging until condition and model are verified.
Choose surfaces for the whole assembly
Tiles should suit the location, intended use, cleaning preferences and installation. The installer needs to review size, thickness, surface, pattern, edge treatment and likely set-out. Large tiles do not automatically reduce labour, especially on compact walls with many cuts.
Prepare a tile-area schedule showing each wall and the floor. Decide full-height, partial-height and painted zones. Mark niches, ledges, external corners and transitions. Agree whether edges use trims or another detail, and include matching or contrasting grout deliberately.
Choose cabinetry materials and finishes suitable for bathroom conditions, with realistic access to traps and isolation points. Select compatible coatings for ceilings and untiled walls. Ask suppliers for current care instructions and warranty conditions instead of relying on generic material claims.
Check approvals, licences and property-specific rules
Bathroom approval and licensing requirements depend on the work, building classification, jurisdiction and property. Structural changes, external openings, fire-rated elements, common property and drainage alterations can change the pathway. Contact the local approval authority, building surveyor or certifier as applicable before construction.
State examples must remain state examples. In NSW, the government publishes a kitchen, bathroom and laundry renovation licence category and explains its scope and threshold. Other states and territories have their own systems. Specialist plumbing, electrical, gas, waterproofing and structural tasks may require separate qualifications regardless of who coordinates the project.
Apartment owners should also review by-laws, renovation classifications, common-property boundaries, working hours, protection, waste routes and approval conditions. Written strata approval does not replace statutory approval, and statutory approval does not replace owner-corporation permission.
For more detail on this part of the project, see What Approval Does an Apartment Renovation Need?.
Turn the design into a quote-ready package
Comparable quotes require comparable information. Prepare a plan and elevations, demolition scope, fixture schedule, tile-area schedule, lighting and ventilation intent, waterproofing responsibility, access notes and desired finishing. State which products are contractor-supplied and which are owner-supplied.
Ask quotes to separate:
- Site protection, demolition, waste and hazardous-material exclusions.
- Plumbing, electrical and other specialist work.
- Substrate repair allowances and waterproofing.
- Tiling quantities, tile allowance and edge details.
- Fixtures, cabinetry, screen, mirror and accessories.
- Painting, carpentry, sealants, cleaning and making good.
- Professional fees, applications, inspections and certificates.
- GST, provisional sums, exclusions and proposed variations process.
Use the same package with each tenderer and follow the renovation quote comparison guide. Verify licences and insurance relevant to the work and jurisdiction. Clarify who supervises specialist trades and who owns coordination at every interface.
Build the programme backwards from dependencies
A practical sequence may include preconstruction investigations, product ordering, protection and strip-out, substrate assessment, framing, services rough-in, inspections, preparation, waterproofing and curing, tiling, painting, fixture fit-off, joinery, shower-screen measurement and installation, testing and final documentation.
The exact order can overlap or change, but dependencies cannot be wished away. A custom screen may be measured only after tiling. A vanity may need to arrive before plumbing fit-off. Waterproofing and adhesives require specified conditions and curing periods. Do not set a completion date by adding only labour days.
Record decision deadlines as well as site dates. If tile must be approved before ordering, or a screen has a measured lead time, show that milestone. Add reasonable float for approvals, delivery and defect correction rather than planning every activity with zero tolerance.
Prepare the household for construction
Decide how the household will bathe and use a toilet while the room is unavailable. One remaining bathroom can still create pressure for a large family. Allow for dust barriers, safe storage, pets, children, work-from-home needs and access for deliveries.
Confirm water and power shutdown notices, daily working hours, parking and waste location. Protect adjoining floors and plan where tiles will be cut. In apartments, comply with lift bookings and common-area protection. Include temporary accommodation or gym access in the real project budget if needed.
Use hold points rather than inspecting only at the end
Agree who checks the room after demolition, after framing and services, before waterproofing is covered, during tile set-out and at fit-off. Required statutory inspections vary, but project hold points can also confirm that concealed work matches the documents.
Do not direct technical work outside your competence. Ask the responsible practitioner to explain evidence and sign-off for their scope. Photograph concealed service routes and waterproofing without interfering with the work. Record approved changes in writing with their cost and time effect.
Final inspection checklist
- Fixtures match the approved schedule and operate correctly.
- Doors, drawers and screen panels move without collisions.
- Water drains as designed and visible junctions are complete.
- Ventilation, lighting, switches and outlets operate as intended.
- Tiles, grout, sealants, paint and cabinetry are reasonably finished.
- Access panels and isolation points remain usable.
- Waste is removed and adjoining areas are made good.
- Certificates, warranties, care guides, photos and product records are received.
Create a defects list with photographs and agreed completion dates. Test the room in normal use where appropriate, rather than judging only appearance. Final payment should follow the contract and applicable law, with unresolved items handled through the documented process.
Keep a durable bathroom record
Store drawings, contracts, variations, invoices, product schedules, licences, certificates, warranties and concealed-work photographs together. Record paint colour, grout, sealant and spare tile location. Future repairs are easier when a plumber can identify an in-wall system or a replacement part.
A strong bathroom plan is not the one with the most selections. It is the one that makes dependencies visible before construction: how people move, where water goes, how moist air leaves, who performs regulated work and what happens if concealed conditions differ. Resolve those foundations first, then spend confidently on the finishes people will see.