Bathroom renovation and waterproofing quote checklist

A finished bathroom can look excellent while hiding poor falls, incomplete waterproofing or inaccessible pipe joints. The quotation and inspection sequence should make concealed work checkable before tiles and fittings cover it.

What the official sources establish

CIDB advises formal contracts and required approvals for construction work. Product-system instructions, competent installation and property-specific approval conditions should be incorporated into the agreed method rather than left as an informal promise.

What to check

• Demolition depth, substrate repair and responsibility for pre-existing leaks.
• Named waterproofing system, number of coats, height or area and treatment at corners and penetrations.
• Floor falls, drain location, kerb detail and an agreed water or flood-test procedure.
• Tile, grout, sanitary fitting, pipe, valve, access panel, protection and defect scope.

A practical way to decide

1. Photograph adjacent rooms and ceilings below before work begins.
2. Approve a written drawing and waterproofing method with the contractor.
3. Inspect and photograph prepared surfaces, completed membrane and test result.
4. Test drainage, hot and cold supply, leaks and fittings before final payment.

A useful decision rule

Choose a proposal that defines the hidden system and test points, not one that only names visible tile and sanitaryware brands. Evidence before covering is part of the deliverable.

Common mistake to avoid

Do not allow tiling immediately after membrane application unless the product method permits it. Required curing, thickness and test timing vary; the exact system instructions should control.

Keep the evidence

Save the dated product page, quotation or terms you relied on, together with receipts, model or registration numbers and written messages. Public pages and commercial terms can change; recheck the linked official sources before committing money or making a complaint.