Cost & scope
What changes the cost of a bathroom renovation?
A bathroom’s cost is not decided by its size alone. It depends on how much must be removed, repaired, rerouted, rebuilt and finished—and on the constraints of the building it sits in.
This guide explains the factors that move the estimate. OnGround follows an estimate-first process: a final quotation is prepared after assessment, scope definition and key specification choices—not before.
Design visualisation
The factors that move the estimate
Existing condition
Repeated leakage, damaged substrate and old concealed lines can change the required scope.
Layout changes
Moving drains, WC positions or water points usually adds more work than replacing items in compatible positions.
Waterproofing and floor build-up
Surface preparation, detailing, testing and slope correction affect both time and cost.
Tiles and installation
Tile size, layout, cuts, niches, patterns and substrate condition influence material and labour.
Fixtures and sanitaryware
Product selection, concealed systems, glass, vanity and accessories can vary widely.
Apartment logistics
Access, approved timings, lift protection, debris rules and occupied-home constraints can affect execution.
Why we don’t quote from photos
Photographs help us understand the project and prepare for the visit, but they usually cannot reveal every concealed condition, measurement or building constraint. A number given before the assessment would be a guess—and the wrong kind of certainty.
After the assessment, the estimate is itemised: work categories, specifications, assumptions, exclusions, optional upgrades and payment stages. You can see what drives each line.
Common questions
- Can you give a final price from photographs?
- No. Photos help us prepare, but final pricing follows a site assessment and scope confirmation. This protects you from an estimate that changes once concealed conditions are known.
- Does a bigger bathroom always cost more?
- Not necessarily. A small bathroom with failed waterproofing, rerouted drains and full demolition can involve more work than a larger room that needs only a refresh. Condition and scope matter more than area.
- What is included in the estimate?
- The itemised estimate covers work categories, specifications, assumptions, exclusions, optional upgrades and payment stages. Building fees, restricted timings or special disposal requirements are stated separately where they apply.
Get an itemised estimate, after the assessment.
Share the home’s age and the main problems. We’ll arrange a site assessment and prepare an estimate for the work your bathroom genuinely needs.
Last reviewed 24 July 2026 · Reviewed by the OnGround Renovation Team