What is quote and estimate generation?
A quoting tool lets your team (or your customers) assemble an itemised list of products, services, and labour, then produce a professional document to send for approval before any work begins. It is the step upstream of invoicing — you are asking "is this acceptable?" before committing to the job.
For trade and professional services businesses, quotes are often legally significant documents. A signed quote can constitute a contract, so the system needs to capture who accepted it, when, and what version they agreed to. This is different from a rough ballpark — a proper quote module manages status (draft, sent, accepted, declined, expired) and keeps a full history.
Once accepted, the quote converts directly into an invoice, eliminating double-entry and ensuring the billed amount matches exactly what was agreed.
When does your app need it?
- Your business provides variable-scope services where price depends on specifications — trades, construction, consulting, events, custom manufacturing
- You send quotes to customers and need to track whether they have been viewed, accepted, or have lapsed
- You want customers to accept a quote online rather than via email reply, with a timestamp and optionally a signature
- Your invoicing workflow starts from an accepted quote and you want to avoid re-entering data
- You need to generate branded PDF documents to send to customers or attach to jobs
- You have multiple team members preparing quotes and need a central place to manage them
How much does it cost?
Adding quote and estimate generation typically adds 5–11 hours of development — roughly $1,000–$2,000 AUD.
At the simpler end, this is a form that assembles line items, calculates totals including GST, and renders a PDF. At the more complex end, it includes pricing rules and product catalogue lookups, e-signature capture, expiry reminders, revision history, and automated conversion to invoice on acceptance.
How it's typically built
Quotes are stored as records in your database with a line-items array (description, quantity, unit price, GST flag). A PDF is generated server-side using a library like Puppeteer or React PDF, rendered from an HTML template that matches your brand. The quote is emailed to the customer with a unique link to a read-only acceptance page.
On that acceptance page, the customer can approve or decline. E-signature is typically handled with a canvas-based signature pad or a lightweight integration with DocuSign or Adobe Sign. Acceptance triggers a status update, locks the document, and optionally creates a draft invoice or job. GST is calculated at line-item level to comply with Australian tax invoice requirements.
Questions to ask your developer
- Will quotes pull from a product or service catalogue, or will line items be entered manually each time? Catalogue integration adds time but speeds up quoting significantly.
- Do you need e-signature, or is a click-to-accept button sufficient? Legally binding e-signature adds complexity and may require a third-party service.
- Should accepted quotes automatically create invoices or jobs? This integration with downstream workflows needs to be scoped carefully.
- What happens when a quote needs to be revised after it's been sent? You'll need a versioning or revision approach.
- Do quotes expire? Automatic expiry with customer notification is a common requirement that adds to the build.
See also: Invoicing and payments · PDF generation · App cost calculator