Fixed Price vs Time & Materials Software Contracts UK — Honest Comparison (2025)
For most UK custom software projects with defined requirements: fixed price is better for the client (cost certainty, risk transferred to supplier, clear accountability). Time & Materials is better when requirements genuinely cannot be defined upfront (R&D, discovery phases, rapidly changing scope). ClickMasters uses fixed-price Agile for the delivery phase and Time & Materials for Technical Discovery — giving clients the best of both. The choice between fixed price and time & materials (T&M) is one of the most consequential decisions in UK software procurement. The wrong choice can result in budget overruns (T&M without scope control) or scope disputes (fixed price with poorly defined requirements). Here is an honest comparison based on UK market reality.
| Factor | Fixed Price | Time & Materials |
|---|---|---|
| Cost certainty | ✅ Agreed upfront — no surprises | ❌ Unknown — hours × rate |
| Scope flexibility | ⚠️ Changes require formal CR + cost | ✅ Easier to change direction |
| Risk allocation | Risk on supplier if estimate wrong | Risk on client — overruns are your cost |
| Requirements maturity | Needs defined requirements upfront | Works with vague requirements |
| Client management overhead | Low — supplier manages delivery | High — client must track hours |
| Supplier motivation | Efficient delivery = higher margin | More hours = more revenue |
| Best for | Defined product builds | R&D, discovery, rapidly changing scope |
| ClickMasters approach | Fixed price for delivery phase | T&M for Technical Discovery only |
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