Bathroom renovation costs vary widely because no two rooms, homes or scopes are the same. This page explains what tends to push costs up or down, and what to ask before you compare written quotes.
What is being replaced matters most. A cosmetic refresh costs far less than a full strip-out with new drainage, sheeting and waterproofing.
Hidden rot, failing screed, old plumbing or asbestos in older Queensland homes can add work that no one can see until the room is opened up.
Tiles, tapware, vanities and screens vary enormously. Labour to lay large format or stone look tiles is usually higher than for standard tiles.
These are the factors that most often explain why two similar looking bathrooms end up costing very different amounts.
A larger floor area means more sheeting, more waterproofing membrane, more tiling and more time. Layout also matters: a room where the shower, toilet and vanity stay put is usually simpler to renovate than one being rearranged.
Relocating a toilet, shower or basin usually means altering drainage, which can involve cutting or jackhammering a slab, re running waste pipes and adjusting falls. Staying with the existing plumbing positions is often the single biggest saving.
Waterproofing is a defined part of a wet area build rather than an optional extra. Correct falls to the waste, suitable sheeting, sealing of joints and a properly applied membrane all take time and materials. Reworking or repairing a wet area that was previously done poorly can also add cost.
Tile size, format, finish and pattern all affect labour. Large format tiles, tiles with tight tolerances, intricate patterns and full height tiling generally take longer to set out and lay than simple layouts. Under tile heating, niches and feature walls also add work.
Older Queensland homes often hide problems behind tiles and sheeting, such as rotten framing, failed screeds, corroded pipework or previous non compliant work. These are rarely visible before strip out, which is a common reason a project moves beyond its original scope.
Stairs, narrow side access, upper floor units, limited parking and restricted working hours all slow a job down. Waste removal and the delivery of heavy materials such as tiles and sheeting are also affected by how easily a site can be reached.
Vanities, tapware, toilets, shower screens, mirrors, lighting and exhaust fans vary widely in cost and quality. Some fittings are also harder to install or require additional plumbing or electrical work, which adds to the overall scope.
A written quote that is broken down by stage is far easier to compare than a single lump sum. It also gives you a clear record of what was agreed if anything changes during the build.
Itemised quotes show whether waterproofing, sheeting, waste removal, tiling or fittings are included, so two quotes can be compared on the same basis.
Ask what is not included. Common exclusions include tiling to ceilings, floor levelling, painting, electrical work, structural repairs and asbestos removal.
Many quotes include an allowance for tiles or fittings rather than a fixed selection. Ask what happens if your choices cost more or less than the allowance.
A written scope is the reference point if there is any disagreement later about what was meant to be done.
A written, itemised scope makes it far easier to compare quotes on the same basis.
These questions help reveal how a quote was put together and how changes will be handled during the build.
Ask how extra work is priced, whether it needs written approval before it starts, and how you will be told about it.
Ask what is not covered, such as repairs after strip out, painting, electrical work or asbestos removal.
Ask who is responsible for the waterproofing and preparation, and what records or documentation you will receive at completion.
Ask how payments are spread across the job and what each stage covers before you commit to anything.
A very low quote is often low for a reason. It may exclude waterproofing preparation, omit waste removal, rely on a narrow scope, or leave no allowance for repairs once the room is opened up.
Low quotes sometimes leave out items that are needed to finish the room properly, which then appear later as variations.
If no allowance is made for problems behind the tiles, the cost of fixing them may fall outside the agreed scope.
Cheaper quotes may use lower grade sheeting, adhesives or fittings, or reduce preparation time that a wet area needs.
Waterproofing and drainage done poorly can lead to leaks, damaged framing and costly rework later. Value should be judged on the whole job, not the headline total.
Quotes vary because the scope, inclusions, allowances, materials and assumed site conditions all differ. A lower quote may include less work or make less allowance for repairs.
A variation is a change to the agreed scope, such as extra work found after strip out or a change in your selections. Ask how variations are priced and approved in writing before work starts.
An allowance is a set amount for items not yet chosen, such as tiles or tapware. It lets the quote be prepared before you have made every selection, and it is adjusted once the actual cost is known.
It is worth checking whether waterproofing and wet area preparation are listed clearly in the quote, and who is responsible for that part of the work.
Some tasks, such as painting or removing fittings, may be suitable for a home owner. Wet area work, plumbing and electrical work are not, and should be carried out by licensed contractors.
Check that the scope, inclusions, exclusions, allowances, variation process and payment stages are all in writing, and ask about any item that is unclear.
The rest of the guide covers waterproofing, wet area preparation, tiling and how to compare quotes for a Queensland bathroom renovation.