The verdict in three sentences
A clear specification document is the best investment before building a SaaS platform: a framing workshop costs 4,000 to 12,000 EUR and takes 2 to 4 weeks. Without it, the gap between agency quotes commonly reaches 2x to 3x, not because agencies cheat but because they price different scopes. A good spec turns a subjective tender into an objective comparison.
The standard SaaS specification outline
A usable spec covers five blocks. Here is the expected content and relative weight.
| Section | Expected content | Weight | Common trap |
|---|---|---|---|
| Context & goals | Problem, target, KPIs | 10% | Staying too vague |
| Functional | User stories, journeys, roles | 40% | Forgetting edge cases |
| Technical | Architecture, integrations, volume | 20% | Imposing a tech for no reason |
| Security & compliance | GDPR, auth, RBAC | 15% | Treating it as an annex |
| Support & run | Maintenance, SLA, roadmap | 15% | Ignoring post-delivery cost |
The functional section is the core: badly written, it is what makes quotes diverge.
Choosing your agency: the criteria that matter
The cheapest is almost never the right one. Here is a 2026 weighting grid.
| Criterion | Weight | What to check |
|---|---|---|
| Similar SaaS experience | 25% | References, live demos |
| Quality of proposed framing | 20% | Reformulation of your need |
| Team actually assigned | 15% | Seniority, turnover |
| Methodology & transparency | 15% | Sprints, code access |
| Price and model | 15% | Fixed price vs time & materials |
| Support & reversibility | 10% | Code ownership, exit |
Compare quotes on a common basis
Bring each quote to the same grid to avoid the sticker-price trap. Example across three offers for the same platform.
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| Item | Agency A | Agency B | Agency C |
|---|---|---|---|
| Framing | 6,000 EUR | included | 9,000 EUR |
| Development | 48,000 EUR | 95,000 EUR | 62,000 EUR |
| Scope covered | 60% | 100% | 85% |
| Year-1 support | 9,000 EUR | 14,000 EUR | 11,000 EUR |
| Code ownership | yes | no | yes |
| Real cost at equal scope | ~90,000 EUR | 95,000 EUR | ~82,000 EUR |
Quote A looks cheapest but covers only 60% of scope: at equal scope it converges with the others.
Mini case study
Julian, project director at a B2B software vendor in London, receives three quotes ranging from 48,000 to 95,000 EUR for the same platform. He invests 8,000 EUR in a 3-week framing workshop that produces a precise spec. Re-priced at equal scope, the three offers tighten to between 82,000 and 95,000 EUR: the gap drops from 2x to 15%. The spec spares him an estimated 30,000 EUR overrun on forgotten features and secures the agency choice.
FAQ
Should I pay for a specification document? A paid framing workshop (4,000 to 12,000 EUR) almost always pays off: it prevents incomparable quotes and overruns. Some agencies deduct it from development if you continue with them.
How long does framing take? Between 2 and 4 weeks for a medium-complexity SaaS platform, with 2 to 4 workshops, mockups and a delivered document. That is short against the 6 to 10 months of development it secures.
Why do quotes vary so much? Almost always because of a vague scope: each agency fills the gaps its own way. A 2x to 3x gap signals a poorly framed need, not dishonest agencies. The spec removes that gap.
What should the technical part contain? Target architecture, integrations, expected volume, performance and security requirements. Avoid imposing a specific tech without a business reason: let the agency propose and justify.
Should support be in the spec? Absolutely. Maintenance cost (10 to 20% of budget per year), SLAs and enhancements must be priced from the start, otherwise the quote comparison is skewed and the real budget underestimated.
Let's scope your project. Send us your goals and main features: we run a framing workshop and produce a comparable specification. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
