Software Requirements Document: Guide + Free Template

Everything a non-technical founder needs to write a solid software requirements document before hiring a developer: 8 key sections, a copy-paste template, and the most common mistakes to avoid.

TL;DR

A software requirements document (SRD) is the reference document you hand to a developer before any quote: project context, features, technical constraints, success criteria.
Its real purpose: align both parties on the same scope and serve as a reference point if disagreements arise.
Without it, quotes vary wildly and developers often deliver something different from what you expected.
A good SRD covers 8 key sections: context, functional scope, technical constraints, UX/UI, security/GDPR, budget, timeline, acceptance criteria.
No need to write 30 pages. For most projects, a clear bullet-point list of features is enough. Aim for completeness, not volume.
No technical skills required: clear business language is sufficient.
AI helps you write faster, but without direction it adds unnecessary features and bloat.
Once your SRD is ready, choose between no-code/AI tools, an agency, a freelancer, or a packaged offer.

Why Write a Requirements Document Before Hiring

Without a reference document, every contractor interprets your idea differently. The result: quotes that are impossible to compare, scope that drifts, and an app that misses the mark.

With an SRD, you get:

Comparable quotes (same scope, same basis)
A clear perimeter that prevents scope creep
Faster delivery (less back-and-forth during development)
A reference document if a disagreement arises

Without one, you risk:

Cost overruns and delays
Features that were never discussed showing up on the invoice
An app that solves the wrong problem

Writing an SRD takes 2 to 10 hours depending on project complexity. That is a small investment compared to weeks of misaligned development.

Your Requirements Document Does Not Need to Be Complicated

The right level of detail depends on the stakes. For a €100,000 enterprise project, a thick document is obvious. For most web projects, a prioritised bullet list of required features is enough.

What matters is completeness, not volume.

Accept that not everything will be planned in advance. You discover things along the way. That is exactly why waterfall often fails and why agile methods exist: two-week sprints, lighter documents, regular adjustments.

The real role of the SRD is simple: align both parties on the same scope and settle disputes if they arise. It is a trust contract, not a specification carved in stone.

The 8 Essential Sections of a Software Requirements Document

1. Project Context and Objectives

Start here. Describe:

Your company and its activity
The problem you are solving
The goal of the application
How you will measure success (metrics)
The type of app (SaaS, marketplace, internal tool, etc.)
The business model

This section takes 10 minutes to write and saves hours of misunderstanding.

2. Functional Scope

This is the heart of the document. List every feature the app needs to have.

Use user stories to structure them: "As a [role], I want [action] so that [benefit]." This format forces you to think from the user's perspective, not the developer's. Atlassian has a solid guide on user stories with examples.

Separate clearly:

Must-have (MVP): features without which the app cannot launch
Nice-to-have (V2): features for a future iteration

A prioritised bullet list is an excellent starting point.

3. Technical Constraints

Specify what you already know or have decided:

Tech stack preferences (if any)
Hosting requirements (cloud provider, region, on-premise)
Third-party integrations (Stripe, Salesforce, Zapier, etc.)
Browser and device compatibility requirements

If you do not have preferences, say so. "Stack open" is a valid answer.

4. UX/UI Requirements

Describe the visual and interaction expectations:

Brand guidelines (colors, fonts, logo)
Wireframes or mockups if you have them
Responsive design requirements (mobile, tablet, desktop)
Visual references (apps you like the look of)

You do not need a Figma file at this stage. Screenshots and links are fine.

5. Security and Compliance

This section is skipped more often than any other. Do not skip it.

Specify:

Authentication method (email/password, SSO, OAuth)
User roles and permissions
Data collected from users
GDPR compliance requirements and data hosting location

GDPR enforcement is accelerating fast. Cumulative fines since 2018 now exceed €7.1 billion, with €1.2 billion issued in 2025 alone. The maximum penalty is €20M or 4% of annual global revenue, whichever is higher. The ICO's guide to data protection principles is a good starting point for UK-based projects.

6. Budget and Price Range

Give a realistic range. Developers use it to calibrate their proposal.

A stated budget is an effective filter: it removes contractors who are too expensive or who would over-engineer the solution. "€10,000 to €20,000" is more useful than "budget TBD."

7. Timeline and Milestones

Specify:

Target launch date
Intermediate milestones (beta, user testing, etc.)
Your availability for feedback and reviews

If the date is flexible, say so. If it is fixed (product launch, trade show, fundraising deadline), say that too.

8. Acceptance Criteria and Testing

Define precisely what "done" means. These criteria form the basis of the final review before you sign off.

Examples:

"A user can register, log in, and reset their password without errors"
"The dashboard loads in under 2 seconds on a standard 4G connection"
"All forms validate inputs and display clear error messages"

Vague acceptance criteria lead to endless revision cycles.

Light or Detailed: Which Requirements Document Do You Need?

Criteria	Light SRD	Detailed SRD
Length	3-5 pages	10-20 pages
Detail level	Bullet-point list	Detailed user stories + edge cases
Wireframes	Optional	Figma mockups
Technical constraints	Stack open	Fully specified
Budget range	Under €15,000	Over €30,000
Writing time	2-4 hours	1-2 weeks
Best for	Early startup / MVP	Established product / complex project

For a first MVP, a light SRD is enough. You will refine requirements as you build and learn. Do not let the perfect document block you from starting.

The Most Common Mistakes

Being too vague about features. "Users can manage their profile" tells a developer nothing. What fields? What actions? What happens if they delete their account?
Forgetting edge cases. What happens when a payment fails? When a user tries to register with an existing email? These scenarios cost money to fix after launch.
Not specifying third-party integrations. Stripe, Intercom, HubSpot, your existing CRM: each integration adds scope. List them explicitly.
Confusing the SRD with a mockup. A requirements document describes what the app does. A mockup shows how it looks. Both are useful. They are not the same thing.
Forgetting acceptance criteria. Without them, "the app is finished" is a matter of opinion.
Underestimating security and GDPR compliance. Authentication, role management, data storage: these are not afterthoughts. Build them into the requirements from day one.
Delegating everything to AI. AI is a good co-pilot for structuring and speeding up the process. But it adds features and sections you never asked for in an attempt to be "complete." That inflates scope and quotes. It does not know your business or your stakes. Use it as a co-pilot, not a pilot.

Requirements Document Template (Copy-Paste Ready)

Copy the block below, fill in the brackets, and you have a working SRD.

SOFTWARE REQUIREMENTS DOCUMENT
Project: [Project name]
Version: 1.0
Date: [Date]
Author: [Your name]

---

1. PROJECT CONTEXT AND OBJECTIVES
   - Company: [Brief description of your company]
   - Problem being solved: [What pain point does this app address?]
   - Goal: [What should the app achieve in concrete terms?]
   - Success metrics: [e.g. 500 registered users in 3 months, 80% task completion rate]
   - App type: [SaaS / marketplace / internal tool / mobile app / other]
   - Business model: [Subscription / one-time purchase / freemium / other]

---

2. FUNCTIONAL SCOPE

   Must-have features (MVP):
   - As a [role], I want [action] so that [benefit]
   - As a [role], I want [action] so that [benefit]
   - [Add as many as needed]

   Nice-to-have features (V2):
   - [Feature 1]
   - [Feature 2]

---

3. TECHNICAL CONSTRAINTS
   - Tech stack: [Preferred stack or "open"]
   - Hosting: [Cloud provider / region / on-premise / open]
   - Third-party integrations: [Stripe, Salesforce, Zapier, etc. or "none identified yet"]
   - Browser/device compatibility: [Chrome, Safari, Firefox / mobile-first / desktop only]

---

4. UX/UI REQUIREMENTS
   - Brand guidelines: [Link to brand kit or "to be provided"]
   - Wireframes/mockups: [Link to Figma / attached / "not yet available"]
   - Responsive design: [Mobile + desktop / desktop only / mobile-first]
   - Visual references: [URLs of apps you like the look of]

---

5. SECURITY AND COMPLIANCE
   - Authentication: [Email/password / SSO / OAuth / magic link]
   - User roles: [e.g. Admin, Editor, Viewer]
   - Data collected: [List personal data fields: name, email, payment info, etc.]
   - GDPR: [Data hosting location / DPA agreement required / cookie consent]
   - Other compliance: [ISO 27001 / SOC 2 / sector-specific regulations]

---

6. BUDGET AND PRICE RANGE
   - Budget range: [e.g. €8,000 to €15,000]
   - Billing preference: [Fixed price / time and materials / retainer]

---

7. TIMELINE AND MILESTONES
   - Target launch date: [Date or "flexible"]
   - Key milestones: [e.g. Beta ready by [date], user testing by [date]]
   - Availability for feedback: [Hours per week / preferred communication channel]

---

8. ACCEPTANCE CRITERIA AND TESTING
   - [Criterion 1: e.g. A user can register and log in without errors]
   - [Criterion 2: e.g. Dashboard loads in under 2 seconds on 4G]
   - [Criterion 3: e.g. All forms validate inputs and show clear error messages]
   - [Criterion 4: e.g. Admin can create, edit, and delete user accounts]

---

ANNEXES
   - Wireframes / mockups: [Attached or linked]
   - Technical diagrams: [Architecture diagram, data model, etc.]
   - Competitive references: [URLs of similar apps]
   - Brand assets: [Logo, color palette, typography]

Which Contractor to Choose After Writing Your SRD?

Your SRD is ready. Now you need to decide who builds it. Four options, each with a different profile.

For a detailed breakdown of costs per option, see our guide on web application development costs.

No-code and AI tools (Bubble, Lovable, v0)

These are mature, production-ready tools. They are excellent for validating quickly and sustaining standard apps over time. The limit is use-case specific: fine-grained multi-tenant authentication, advanced payment flows, custom APIs, high-performance requirements. That is not a quality issue. It is a fit question.

A smart strategy: start no-code, switch to custom development if the product justifies it. You can build your MVP in weeks, not months.

Web agency

Full team (PM, designer, developers, QA). Well-suited for complex projects with multiple integrations and stakeholders. Budget: €20,000 to €80,000. Timeline: 2 to 6 months. The trade-off: changing contacts, management overhead, and slower feedback loops.

Freelance developer

More direct, more flexible, often less expensive. The relationship is personal, which helps. Reliability varies significantly. Expect €500 to €900 per day for a senior custom web application development profile.

Packaged offer like Startup Express

A well-defined MVP, fixed scope, fixed budget (around €7,000), fixed timeline. No time-and-materials uncertainty. You know exactly what you are getting before you sign. The Startup Express offer, an MVP in 10 days is designed for founders who have their SRD ready and want to move fast.

FAQ

How long should a requirements document be?

A light SRD runs 3 to 5 pages. A detailed one covers 15 to 20 pages. For most early-stage projects, a prioritised bullet list of features is enough to get comparable quotes. Do not let document length become a blocker.

Do I need technical skills to write it?

No. An SRD is a business document. Clear descriptions of what the app should do, for whom, and why are more valuable than technical jargon. If you can explain your product to a potential customer, you can write an SRD.

What is the difference between an SRD and technical specifications?

An SRD describes business needs, written by the client. Technical specifications describe architecture, data models, and implementation choices, produced by the developer. You write the SRD. The developer writes the specs.

Can I use AI to write my requirements document?

Yes, as a co-pilot. AI is good at structuring your thoughts and speeding up the drafting process. The problem: it adds features and sections you never asked for in an attempt to be "complete." That inflates scope and quotes. Always review the output with your business eye and cut what does not belong to your project.

How much does it cost to hire a consultant to write it?

Expect €800 to €2,500 for a full SRD written by a business analyst or product consultant. A scoping phase (lighter, 2 to 3 hours) typically costs €500 to €800. Both are doable yourself with the template above.

My SRD is ready: what is the next step?

Send it to 2 to 3 contractors. For the method to identify and evaluate the right ones, see our guide to finding a reliable freelance developer. Compare not just price, but the quality of the questions they ask, their proposed timeline, and their references. A contractor who asks sharp questions about your requirements is a better signal than the cheapest quote.