The verdict in three sentences
A construction SME answering 120 tenders a year and spending 3 days per technical proposal ties up about 360 days of skilled work per year on writing. An AI assistant that analyzes the tender documents and drafts from your internal references costs 15,000 to 40,000 EUR in 2026, plus 50 to 300 EUR per month in model usage. With writing time cut by two to three, the tool frees 120 to 240 days per year and pays for itself within months, provided a human review stays systematic.
What the assistant actually does
The assistant does not replace your bid manager: it prepares the ground. It reads the tender rules, technical specifications and contract terms, extracts the award criteria and their weighting, then proposes a proposal outline and first drafts based on your knowledge base (project references, staff and equipment, QHSE procedures, method statements).
| Component (2026, excl. VAT) | Role | Range |
|---|---|---|
| Tender document ingestion | PDF reading, criteria extraction, weightings, required documents | 3,000 to 7,000 EUR |
| Knowledge base | Indexing of past proposals, references, CVs, certificates | 4,000 to 10,000 EUR |
| Assisted drafting | Proposal outline, first drafts per criterion, company tone | 4,000 to 10,000 EUR |
| Compliance check | Document checklist, missing items, consistency of deadlines | 2,000 to 6,000 EUR |
| Interface and export | Editor, approval, Word or PDF export in house style | 2,000 to 7,000 EUR |
| Model usage cost | API calls depending on tender volume | 50 to 300 EUR per month |
The low end (15,000 EUR) covers tender analysis and assisted drafting on a simple document base. The high end (40,000 EUR) adds the compliance check, a collaborative editor and templates per contract type (structural work, finishing, civil works, renovation).
Time savings in numbers
The orders of magnitude below come from comparable deployments in SMEs with 30 to 150 employees. They depend heavily on the quality of your reference base.
| Step of a bid (2026 order of magnitude) | Without assistant | With assistant |
|---|---|---|
| Reading and analyzing the tender | 4 to 6 hours | 1 to 1.5 hours |
| Technical proposal outline | 2 to 3 hours | 30 minutes |
| Drafting sections | 12 to 16 hours | 5 to 7 hours |
| Finding references and CVs | 2 to 3 hours | 30 minutes |
| Document check and review | 2 to 3 hours | 1.5 to 2 hours |
| Total per proposal | 22 to 31 hours (about 3 days) | 9 to 11 hours |
Human review remains non-negotiable: the assistant can get a deadline, a quantity or a reference wrong. The right setup makes it cite its internal sources for every statement, so the reviewer can check in seconds.
Security, confidentiality and model choice
Your proposals and prices are strategic assets. Three requirements belong in the specification: models accessed via API with a commitment not to reuse data for training, hosting of the document base in the European Union, and per-user access rights. Usage cost stays modest: a 200-page tender and drafting one proposal usually consume a few euros of API calls.
Mini case study
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Lukas runs a 60-person finishing contractor in Berlin and answers 120 tenders a year. His bid manager costs about 450 EUR per loaded day. At 3 days per proposal, writing represents 360 days, or 162,000 EUR per year. With an AI assistant at 28,000 EUR and 200 EUR per month of usage, he brings the time down to 1.25 days per proposal: 150 days, or 67,500 EUR. The gross gain reaches 94,500 EUR per year for a first-year cost of 30,400 EUR. Lukas reinvests part of the freed time to answer 30 more tenders (estimate to check against your own volumes).
FAQ
How much does an AI bid writing assistant cost for construction?
Between 15,000 and 40,000 EUR in 2026 depending on scope, plus 50 to 300 EUR per month in model usage. Ongoing maintenance and improvements then run 300 to 800 EUR per month.
Can AI write a technical proposal on its own?
It produces a first draft structured by award criterion, but human review remains essential. Plan 1.5 to 2 hours of review and adjustments per proposal.
Is our project data safe?
Yes, if the architecture uses APIs with a no-training commitment and storage in the European Union. Per-user access rights and logging complete the setup.
How long does it take to go live?
Usually 6 to 10 weeks, including 2 to 3 weeks to collect and clean your past proposals and references. A test on 5 real tenders validates the settings before rollout.
Does the assistant improve the win rate?
No tool guarantees a win rate. It does reduce missing documents and aligns the proposal better with weighted criteria, which leaves more time to refine methodology and price.
Let's scope your project. Send us your annual tender volume and two typical proposals, and we will price an AI assistant tailored to your markets, with budget and go-live timeline. 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.
