The verdict in three sentences
A custom generative AI tool connected to your method statements, references and CVs costs 15,000 to 45,000 EUR (about 13,000 to 38,000 GBP) in 2026 and cuts response writing time by roughly 40 %. It pays for itself from 30 to 40 bids a year, provided your data stays hosted in the UK or EU and every submission goes through human review. Below that volume, a generic SaaS subscription is enough, but it knows neither your references nor your tone.
What AI actually does in a tender response
The gain does not come from "magically" writing a complete technical proposal. It comes from three repetitive tasks: finding the right paragraph in 200 past bids, adapting a reference to the buyer's context, and checking that every requirement in the invitation to tender and specification gets an answer. The tool reads the tender pack, builds a compliance matrix, drafts each section while citing its internal sources, and the bid writer decides.
| Task | Manual time per bid | With AI (2026 estimate) | Gain |
|---|---|---|---|
| Analysing the ITT and specification | 4 h | 1 h 30 | 62 % |
| Compliance matrix | 3 h | 45 min | 75 % |
| Finding references and CVs | 5 h | 1 h 30 | 70 % |
| Writing the technical proposal | 16 h | 10 h | 37 % |
| Formatting and appendices | 4 h | 3 h | 25 % |
| Review and sign-off | 4 h | 4 h | 0 % |
| Total | 36 h | 20 h 45 | 42 % |
Review time does not drop, on purpose: AI can invent a certification or a figure. A bid claiming a qualification you do not hold risks being disqualified, or worse, excluded for misrepresentation.
2026 pricing: generic SaaS, specialist platform or custom tool
| Option | Upfront cost | Annual cost | Knows your documents | Hosting |
|---|---|---|---|---|
| General AI assistant (enterprise licence) | 0 EUR | 300 to 600 EUR per user | No, manual copy-paste | Varies, often outside UK/EU |
| Specialist tender SaaS platform | 2,000 to 5,000 EUR | 8,000 to 25,000 EUR | Partially | UK/EU depending on plan |
| Custom tool, simple scope (RAG + matrix) | 15,000 to 25,000 EUR | 3,000 to 6,000 EUR | Yes, the whole library | UK/EU, your cloud |
| Full custom tool (DMS connectors, CVs, workflow) | 30,000 to 45,000 EUR | 6,000 to 10,000 EUR | Yes, with access rights | UK/EU, your cloud |
| Model API usage | included | 1,500 to 4,000 EUR | n/a | UK/EU region |
Custom makes sense when your documents are scattered (DMS, SharePoint, file servers) and you need per-bid access rights. Confidentiality clauses from some public or industrial buyers forbid sending tender documents to a service hosted outside the UK or EU: check this before choosing.
Safeguards to put in the specification
| Requirement | Why | Budget impact |
|---|---|---|
| Hosting and processing in UK/EU | UK GDPR, buyer confidentiality clauses | +0 to 10 % |
| No model training on your data | Trade secrets | Contractual, 0 EUR |
| Internal source citations on every paragraph | Fast review, no invention | +2,000 to 4,000 EUR |
| Access rights per bid and per team | Ring-fencing of offers | +3,000 to 6,000 EUR |
| Generation log | Traceability in case of dispute | +1,000 to 2,000 EUR |
| Blocking human approval before export | Signatory accountability | Included |
Mini case study
Thomas, bid manager at a 120-person engineering consultancy in London, handles 80 bids a year at 36 hours each, or 2,880 hours. With a 40 % gain he frees 1,152 hours. At a loaded cost of 55 EUR an hour (about 47 GBP), that is 63,360 EUR a year. The custom tool chosen costs 32,000 EUR, plus 7,000 EUR a year for hosting, maintenance and API. Year one: 63,360 minus 39,000, or 24,360 EUR net gain, payback in about 7 months. Thomas reinvests part of the freed time to answer 15 more tenders a year.
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FAQ
Can AI write a full technical proposal on its own?
No, and you would not want it to. It produces a first draft that is roughly 60 to 70 % usable if your library is clean; the rest needs domain expertise and review. Always budget 4 hours of human sign-off per bid.
How long does a custom tool take to deploy?
Between 6 and 12 weeks depending on the number of sources to connect. Indexing 200 to 500 past bids usually takes 1 to 2 weeks, including cleaning out duplicates and obsolete versions.
Is our bid data safe?
Yes if the architecture enforces UK/EU hosting, no training on your data and per-bid ring-fencing. These three points rarely add more than 10 % to the budget and must be written into the contract.
At what volume does it pay off?
Around 30 to 40 bids a year for a 25,000 EUR tool. Below that, a specialist SaaS platform at 8,000 to 12,000 EUR a year is more sensible.
Can a public buyer reject a bid written with AI?
In 2026 no general rule forbids it, but you remain responsible for every statement. An inaccurate reference or certification can get the bid disqualified.
Let's scope your project. Send us your annual bid volume and the state of your document library: we will price a custom tool between 15,000 and 45,000 EUR, delivered in 6 to 12 weeks. 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.
