Cost guide · Indicative only

Vendor tech DD cost

What drives fees for sell-side technology due diligence in the UK, and how to scope work proportionately.

Published competitor and market guides for UK technology due diligence often cite roughly £10,000–£50,000 for a scoped SME or mid-market engagement, with rapid red-flag work below that and complex multi-entity or carve-out themes above. Washington Baltic fees follow scope—not a day-rate markup model. Indicative ranges only; final fees depend on scope, company size, access and timeline.

What affects the fee

  • Number of products, brands or legal entities in scope
  • Depth of code, security and infrastructure review
  • AI/LLM, OSS governance or integration themes
  • Data-room maturity and management availability
  • Timeline compression and parallel buyer processes

Who pays

Vendor due diligence is typically commissioned by the seller or shareholders. Buyers may run their own confirmatory work; a strong vendor report often reduces duplicate effort and protects valuation.

Vendor due diligence services

Cost & timeline FAQ

What drives the cost of vendor tech due diligence?

Cost drivers include number of products or entities, depth of code and security review, geographic spread of teams, data-room maturity, and whether AI, carve-out or integration themes need separate workstreams.

Is vendor DD worth it for a smaller founder-led business?

Often yes—a reduced valuation hits founders hardest. Scoped vendor DD can be proportionate to deal size and prevents buyers from defining the technology story unopposed.

How much does vendor tech due diligence cost?

For many founder-led and SME software or tech-enabled businesses, full vendor tech DD typically falls in an indicative band of about £10,000–£50,000 in the UK, with simpler scopes toward the lower end and complex multi-workstream engagements higher. Figures are indicative UK ranges for scoped work; fees depend on company size, access, depth and timeline.

How long does a vendor technology due diligence take?

A focused vendor review often completes in about two to four weeks once access is agreed. Red-flag or narrower scopes can be shorter; large carve-outs or multi-entity groups take longer. We agree timeline with your corporate finance adviser at scoping.