How to write a software project brief that gets accurate quotes

If the quotes you receive for a project range from a few weeks to a year of work, the problem is usually not the vendors. It is the brief. When a brief is vague, every team has to invent the missing details, and their estimates reflect their assumptions rather than your project.

A good brief does not need to be a hundred-page specification. It needs to answer the questions an experienced team would ask in the first meeting. This guide walks through what to include, what to leave out, and ends with a template you can copy.

Start with the problem, not the solution

The most useful paragraph in any brief explains the problem in business terms: who has it, what it costs them today and how you will know it is solved. Our operations team spends most of Monday re-keying orders from emails into our ERP tells a vendor far more than we need an order management portal.

Describing the problem leaves room for a better solution than the one you had in mind. A good team might suggest an automation instead of a portal, or a simpler first version. If you only describe a solution, you will only get prices for that solution.

It also helps to say why now. A contract renewal on an old system, a regulatory deadline, a funding milestone or a team that is overwhelmed by manual work all shape what a sensible first phase looks like. Vendors who understand the pressure behind a project can propose a scope that relieves it first, rather than quoting everything at once.

The sections every brief needs

1. Background. Your business in two or three sentences, and why this project matters now.
2. Problem and goals. What is broken or missing, and the measurable outcome you want.
3. Users. Each type of user, roughly how many, and what they need to do.
4. Core flows. The handful of journeys that must work in the first version, written as short steps.
5. Integrations and data. Every system the product must talk to, with links to API docs if you have them, and any data that needs migrating.
6. Platforms. Web, mobile, desktop, and which browsers or devices matter.
7. Constraints. Compliance, hosting requirements, existing tech stack, accessibility needs and languages.
8. Budget and timeline. A realistic range and any hard dates, with the reason behind them.
9. Out of scope. What you already know you do not want in this phase.
10. Success criteria. How you will judge the project at launch and a few months later.

Details that change estimates the most

Some details look minor to a business owner but move estimates significantly. Include them even if you are unsure of the answer; saying we do not know yet is useful information too.

• Roles and permissions. Who can see and change what. Multiple organisations, teams or approval steps add real work.
• Existing data. Whether you are starting fresh or importing records from spreadsheets or an old system, and how clean that data is.
• Third-party access. Whether you already have API credentials and sandbox accounts for the systems you need to integrate.
• Content and design. Whether you have a brand, copy and imagery, or expect the vendor to create them.
• Who maintains it. Whether the vendor will run the product after launch, or hand it over to your team.
• Volume. Rough numbers of users, transactions or documents, today and in a year. Ballpark figures are fine.

A copy-ready brief template

Fill this in plainly. Bullet points are fine, and so are honest unknowns. The example values below are placeholders to show the level of detail, not a real project.

project: Order intake automation        # working title
background: >
  Wholesale distributor. Orders arrive by email and are typed
  into our ERP by hand.
problem: Manual re-keying is slow and causes errors.
goals:
  - Orders reach the ERP without manual typing
  - Staff review only exceptions
users:
  - role: Operations staff
    count: ~5                            # rough is fine
    needs: Review and approve flagged orders
core_flows:
  - Email arrives -> order extracted -> validated -> pushed to ERP
  - Exception flagged -> staff fix -> approve
integrations:
  - system: ERP (name and version)
    access: API docs link / sandbox available? yes/no
  - system: Shared mailbox
platforms: [web]
constraints:
  - Data must stay in the EU
  - Single sign-on with our existing provider
priorities:
  must: [extraction, ERP push, exception queue]
  should: [daily summary email]
  could: [supplier portal]
out_of_scope: [mobile app, invoicing]
budget_range: "your realistic range"
timeline: "target date and why it matters"
after_launch: Vendor maintains / we take over
success_criteria:
  - Most orders processed without manual typing
  - Staff time on order entry clearly reduced

Notice what the template does not ask for: database choices, frameworks or hosting providers. Unless you have a genuine constraint, such as an existing stack your team must maintain, leave technology choices to the people proposing. Their recommendations, and how well they justify them, are part of what you are evaluating.

Once the brief is written, send the same version to every vendor you are considering, give them a reasonable deadline, and offer a short call for questions. Ask each one to break their estimate down by feature or phase, to list their assumptions, and to say what they would cut first if the budget were tighter. Those three answers make proposals comparable in a way that totals alone never are.

Common mistakes to avoid

• Copying a competitor. Like Uber for X hides hundreds of features. Describe the specific flows you need instead.
• Listing every idea as essential. If everything is a must, vendors will quote everything, and the number will be alarming.
• Hiding the budget. Without a range, proposals cannot be shaped to fit, and you will waste time on teams far outside it.
• Skipping integrations. These are the most common source of overruns. Name each system and how you access it.
• Asking for a fixed price on an unclear scope. Vendors will either add a large buffer or underquote and argue later. Consider a paid discovery phase first.

A final mistake is treating the brief as fixed once it is sent. Expect it to change after the first conversations, and update it for everyone rather than letting each vendor work from a slightly different version. Keeping one shared document is the simplest way to ensure you compare like with like.

Key takeaways

• Vague briefs produce wildly different quotes because vendors fill gaps with assumptions.
• Lead with the problem and measurable goals, not a prescribed solution.
• Cover users, core flows, integrations, platforms, constraints, budget and success criteria.
• Prioritise features as must, should and could, and state what is out of scope.
• If the scope is still fuzzy, a short paid discovery phase beats a padded fixed price.

Our product design work often starts by turning a rough brief into a clear scope. If you have a draft, send it over and we will tell you what is missing.