The verdict in three sentences
In a civil engineering consultancy, the technical response (quality submission) often carries 40 to 60% of the tender score, and writing it takes 2 to 4 engineer days per bid. A custom AI assistant, fed with your references, CVs and past winning responses through RAG (retrieval-augmented generation), produces a structured first draft in an hour for EUR 12,000 to 30,000 excl. VAT of development (about GBP 10,000 to 26,000). The realistic 2026 goal: halve drafting time and lift the win rate from 18% to 24%, with the engineer still in charge of the technical content.
Why ChatGPT alone is not enough for a technical response
A general assistant writes fluent but generic text. Yet a public buyer scores understanding of the site, a tailored methodology, named staff and comparable references. What wins is your own data: 300 project references, up-to-date CVs of project leads, method statements, evaluation feedback on lost bids. The custom assistant indexes these documents, finds the three references closest to the tendered project and drafts while citing its sources, which the engineer checks.
| Response step | Current method | With a custom AI assistant |
|---|---|---|
| Analysis of tender rules and specifications | 3 to 4 hours | 45 minutes (summary and criteria extracted) |
| Selection of comparable references | 2 to 3 hours | 15 minutes (semantic search) |
| Methodology drafting | 6 to 10 hours | 3 to 4 hours (first draft then review) |
| Updating CVs and organisation chart | 2 hours | 20 minutes |
| Formatting and compliance check | 3 to 4 hours | 1 to 2 hours |
| Total per response | 2 to 4 days | 1 to 2 days |
2026 budget for a tender assistant
The project covers indexing your document base, an interface where you drop the tender pack, response templates by type of assignment (civil engineering design, drainage studies, client-side advisory) and a compliance check against the tender rules. UK or EU hosting and APIs with no data retention are essential for confidential client files.
| Item | 2026 range (EUR excl. VAT) | Detail |
|---|---|---|
| Scoping and document base audit | 1,500 to 3,000 | Inventory of references, CVs, winning bids |
| RAG indexing and document cleanup | 3,000 to 7,000 | 500 to 3,000 documents, per-project metadata |
| Automatic analysis of tender pack and criteria | 2,000 to 5,000 | Extraction of criteria and weightings |
| First-draft generator by section | 3,000 to 8,000 | Templates by assignment type |
| Review interface and source citations | 1,500 to 4,000 | Traceability of every paragraph |
| Compliance check and Word export | 1,000 to 3,000 | Firm's brand guidelines |
| Total development | 12,000 to 30,000 | 6 to 12 weeks |
| API and UK/EU hosting | EUR 150 to 600/month | Depending on bid volume |
Innovation tax reliefs and regional digital grants may, depending on your situation, offset part of this budget: check eligibility with your accountant before signing.
What stays under your control
The assistant does not replace the engineer. It produces a sourced draft, flags tender requirements that are not covered and proposes the most relevant references. Technical sign-off, programme commitments and pricing remain human. Public buyers are starting to spot generic responses: precise text grounded in the site and your real projects remains the decisive argument.
Mini case study
Thomas, director of a 35-person civil engineering consultancy, answers 120 tenders a year, averaging 3 engineer days per response valued at EUR 550 excl. VAT a day. Annual drafting cost: 120 × 3 × 550 = EUR 198,000. His win rate is 18%, about 22 contracts won with average fees of EUR 45,000.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
With an assistant at EUR 22,000 excl. VAT and EUR 400 a month of API, he brings drafting down to 1.5 days: EUR 99,000 of freed time a year. If the win rate rises to 24%, he wins about 7 more contracts, i.e. EUR 315,000 of extra fees. First-year cost: EUR 26,800, recovered within the first three months from time saved alone.
FAQ
How much does an AI tender assistant cost for an engineering consultancy?
Budget EUR 12,000 to 30,000 excl. VAT of development depending on document volume and the number of response templates, then EUR 150 to 600 a month for API and UK/EU hosting.
Do our client documents stay confidential?
Yes, if hosting is in the UK or EU and the API excludes retention and training on your data. Access rights can be restricted by office or by project lead.
Can the AI invent references?
RAG sharply limits this risk because every paragraph cites its source documents, which the reviewer checks in one click. With a well-indexed base, over 95% of proposed references are accurate in the first draft.
How many documents do we need to start?
A base of 50 past responses, 100 reference sheets and up-to-date CVs is enough for an effective first release. The tool improves as new winning responses are added.
How long until it is live?
A first working assistant ships in 6 to 8 weeks, the full version with compliance checks in 10 to 12 weeks.
Let's scope your project. Send us your annual number of tenders, two recent responses and the state of your reference base: we will scope the work, give an indicative budget between EUR 12,000 and 30,000 excl. VAT and a 6 to 12-week schedule. 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.
