Fixed Price vs Time and Materials — Which Software Contract for UK Buyers?
Fixed-price Agile is the right contract model for most UK software projects: cost certainty, scope clarity, and risk on the agency (not the buyer). Time-and-Materials (T&M) shifts all cost risk to the buyer — every scope change, every re-estimate, every delay increases cost with no ceiling. Pure T&M only makes sense for genuine exploration work (research, proof-of-concept, discovery) where scope is truly unknown. ClickMasters offers fixed-price Agile for all delivery phases. Contract model choice is one of the most consequential software procurement decisions for UK businesses. Here is an honest comparison that explains why most UK buyers should insist on fixed-price contracts.
| Factor | Fixed-Price Agile (ClickMasters) | Time and Materials |
|---|---|---|
| Cost certainty | ✅ Price agreed before work starts | ❌ Unknown — hours × rate |
| Scope changes | Change Requests (separately priced) | Each change adds hours — no ceiling |
| Risk allocation | Agency risk if estimates are wrong | Client bears all cost risk |
| Over-run protection | ✅ Agency absorbs over-runs within scope | Client pays for every additional hour |
| FCA project governance | ✅ Fixed cost in budget approval | Variable cost complicates approval |
| Progress visibility | Sprint demos every 2 weeks | Hours billed — not deliverables |
| Quality incentive | ✅ Agency incentivised to be efficient | Hours billed regardless of efficiency |
| Right for | New builds, defined features, regulated builds | R&D, discovery, exploratory work |
| ClickMasters model | ✅ Fixed-price Agile — all delivery | T&M only for Technical Discovery |
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