Bathroom Renovation Invoice Template - New Zealand

Group line items by trade rather than by sequential steps. Create separate sections for plumbing, electrical, tiling, carpentry, and any other trades involved. This clarity helps your client understand costs and makes progress tracking easier. Each trade can list materials and labor separately if applicable. When trades work simultaneously, invoice each component once, using itemized descriptions like "Plumbing rough-in and installation" and "Electrical work—lights and exhaust fan." This approach simplifies comparisons against quotes and makes dispute resolution straightforward if disagreements arise.

Progress invoicing is preferable for most bathroom renovations, especially larger projects. Invoice after completion of major stages: demolition, rough-ins, waterproofing, finishing trades, and final fit-out. This protects your cash flow and is standard practice in New Zealand renovation work. Clients expect progress invoices and can better manage their budgets when they see work stages. Single final invoices create cash flow risk for contractors and may signal inability to manage staged work. Agree on payment milestones upfront in your contract or quote.

GST applies to all labor and most materials in bathroom renovations at 15% in New Zealand. Your invoice must clearly show the GST amount separately and state your GST registration number if registered. Waterproofing compliance is critical—while not directly affecting invoicing, it increases your liability if work fails. Document waterproofing specifications and materials on your invoice to prove you met building code standards. This protects both your business and your client should future moisture issues arise. Always invoice GST correctly to maintain compliance.

Always get written approval before performing variation work, then issue a formal variation order or amendment that the client signs before invoicing. Include a clear description, the additional cost, and how it affects the project timeline. Invoice the variation separately from the original invoice, or include it as an additional line item on the next progress invoice. Using a separate document creates clarity and prevents disputes about scope creep. Include variation details in your project management system and quote tracking so nothing is overlooked during invoicing.

Yes, separating these categories provides transparency and is standard practice for bathroom renovation invoicing. List materials (tiles, vanity units, plumbing fixtures) with their costs, labor separately with hours or rates, and any supplied goods distinctly. This breakdown helps clients understand value and makes it easier to compare your invoice against the original quote. Some clients prefer to source high-value fixtures themselves, so separating materials allows flexibility. Clear itemization also simplifies warranty discussions—fixtures may have manufacturer guarantees while labor carries your guarantee.

Most NZ contractors use a 50% deposit upon signing the contract, with remaining 50% due upon completion. Alternatively, progress payments are common: typically 30–40% at project commencement, middle payments after major stages, and final payment upon handover. Retaining 5–10% until final inspections pass is also standard. Clearly state payment terms on your quote and invoice. Offering a small discount for early payment can improve cash flow. Payment methods should include bank transfer (most common), credit card, or cash—always provide clear bank details on the invoice.

Waterproofing deserves its own line item because it's a specialized service with specific material costs and application rates. Describe it clearly: "Waterproofing membrane application—wet areas—[area in square meters] at [rate per m²]." Include the product name and specification if it exceeds standard practice. This transparency reassures clients that moisture prevention is being addressed properly. Separating waterproofing also makes it easier to claim if disputes arise about water ingress later. Include application method, product warranty details, and area covered on the invoice to demonstrate proper specification.

Your invoice must include your business name and address, GST registration number (if registered), invoice number and date, client name and address, itemized descriptions of work performed, quantities, rates, GST calculation (shown separately), and total amount due. Payment terms and due date are essential. Include invoice payment methods and your bank details for transfer. If you're invoicing before completion (progress invoice), clearly mark it as such. A valid invoice is your legal proof of the work done and amount owed, so accuracy and completeness protect your business.