DRAFT v0.1 / FILE REF CDD/2026/UK-MID-MKT / INDEPENDENT REFERENCE - NOT M&A ADVICE
§ FEE BENCH
F.

Commercial Due Diligence Cost UK

UK CDD fee bands by deal size, DD type and provider tier. Quote-only mandates marked as such. No inferred per-day rates.

§ DIRECT ANSWER

UK commercial due diligence cost clusters in two visible bands. Boutique mid-market mandates run £15-25k for red-flag and up to £50k for full scope, delivered in 3-5 weeks. Big-4 deal-advisory mandates run £75-150k and up to £250k for upper-mid-market full scope, delivered in 5-8 weeks. Every published quote is engagement-letter only.

§ RED-FLAG BOUTIQUE
£15-25k
3-5 wk, top-3 chapters
SRC: ICAEW CF
§ FULL BOUTIQUE
£25-50k
3-5 wk, all 7 chapters
SRC: BVCA Industry Activity
§ MID-MKT BIG-4
£75-150k
5-8 wk, partner-led
SRC: BVCA Industry Activity
§ UPPER-MID BIG-4
£150-250k
6-8 wk, full scope
SRC: OC&C / L.E.K. peer band

§ 1.1By deal size

Deal EVBoutique RFBoutique FullBig-4 FullTypical timeline
<£20m bolt-on£10-15k£20-35k£60-100k2-4 wk
£20-50m£15-25k£25-45k£75-150k3-5 wk
£50-150m£20-35k£40-80k£100-200k4-6 wk
£150-500m£30-50k£60-150k£150-300k5-8 wk

SRC: UK boutique mandate cluster; BVCA Industry Activity 2025-26. Indicative only; every mandate priced in engagement letter.

§ 1.2By DD type

DD typeScopeBoutique feeBig-4 feeTimeline
Red-flag3 top chapters£15-25k£40-75k2-3 wk
FullAll 7 chapters£25-50k£75-150k3-5 wk
Top-up (off VCDD)Incremental scope£10-25k£30-60k2-4 wk
Vendor (VCDD)Sell-side full£30-60k£100-200k4-8 wk

§ 1.3What is included

A £20k boutique mandate usually covers: 10-15 customer interviews, a market-sizing chapter, a competitive map, a one-page risk register and a draft IC summary. Excludes operations diligence in depth, second-round customer follow-ups and partner-level cross-border coverage. A £120k Big-4 mandate covers everything in the boutique scope plus deeper operations diligence, syndicated-lender-acceptable reliance, and a partner cover letter readers expect on a buy-side syndication.

VERIFIED 21 JUN 2026NEXT REVIEW 21 SEP 2026SRC: ICAEW CF; BVCA Industry Activity 2025-26

Marked-up by Oliver Wakefield-Smith. Draft v0.1, 21 June 2026.