How do I write a software requirements document to get accurate quotes?

Why the document matters more than the RFP template

Vendors price what they can see. Vague briefs force them to pad estimates for risk or make optimistic assumptions that cause change orders later. A clear written scope protects both sides.

What to include, section by section

1. Business context (1 paragraph)

State the problem you are solving, why now, and what success looks like in measurable terms. Skip the backstory; vendors need the outcome, not the history.

2. Users and roles

List every type of person who will touch the system — end users, admins, third-party partners. Note rough numbers (e.g., "up to 500 concurrent users") because scale affects architecture and cost.

3. Feature list with priority tiers

Group features into three tiers:

• Must-have — the product cannot launch without these.
• Should-have — important, but negotiable for v1.
• Nice-to-have — future scope or conditional on budget.

For each feature, write one sentence describing what the user can do, not how the system should implement it. Implementation is the vendor's job.

4. Integrations and data sources

Name every external system the software must connect to — payment gateways, ERPs, APIs, authentication providers, cloud platforms. If you don't know the exact integration, say so; that uncertainty itself is useful information.

5. Non-functional requirements

Cover performance targets, uptime expectations, security or compliance requirements (HIPAA, GDPR, PCI-DSS, SOC 2), supported devices and browsers, and language or localisation needs. These are often more expensive to add later than the features themselves.

6. Constraints and preferences

Note any fixed deadlines, preferred tech stack, existing infrastructure the new system must work with, or IP and data-residency rules. If you need to own the source code outright — which is worth specifying — say so explicitly.

7. What you are NOT building

A short out-of-scope list stops scope creep before it starts. One bullet point per exclusion is enough.

Format tips

• Plain prose or a numbered list beats a dense table for initial quotes.
• Attach wireframes or screen sketches if you have them — even rough ones cut ambiguity significantly.
• Share it as a PDF or Google Doc, not a locked file that vendors can't annotate.

What happens if you skip this

Without a written scope, quotes from three vendors can vary by 3–5× for the same project because each vendor is pricing a different mental model. You then can't compare them fairly.

Where CodeNicely fits

If you have a business idea but aren't sure how to break it into a scoped document, CodeNicely offers discovery sessions to help founders and ops teams turn rough concepts into a structured brief — the same approach used before building products like GimBooks and Vahak. Any reputable development partner should offer something similar before quoting.