AICPA-authorised firms helping UK companies, from London fintechs to teams outside the capital, pass US enterprise procurement. Browse the 4 firms below, or tell us your scope and we'll send it to three that fit.
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Five UK-based picks for the audits buyers actually run — top-tier SOC reports, FinTech with DORA, mid-market, price-sensitive SaaS, and national-CPA FS/tech. Each recommendation names one firm with the qualifier that earned the pick.
Grant Thornton UK is the pick for UK and international mid-market and enterprise clients that need Service Organisation Controls reports across AICPA SOC 1/2/3, ISAE 3402/3000, and AAF standards from a top-tier UK CPA firm — the assurance brand US and European counterparties recognise on sight.
BSI Group is the pick for UK FinTech and regulated financial services firms that need DORA, ISAE 3402, or ISAE 3000 alongside SOC 2 — an internationally recognised assurance provider whose reports are accepted by European banking counterparties.
BDO UK is the pick for mid-market UK companies that need a nationally recognised CPA brand on the SOC 2 report — bundles audit, tax, and advisory for financial services, healthcare, manufacturing, and private equity portfolios.
Bulletproof is the pick for UK SaaS and FinTech that need affordable SOC 2 fast — cybersecurity-led firm, 3–8 week timelines, and a familiar brand to UK procurement teams reviewing supplier security.
Mazars UK is the pick when a UK company has outgrown a specialist but does not need a Big 4 letterhead — national-CPA pricing, financial services and technology depth, and a Forvis Mazars network that handles US/EU subsidiaries under one engagement.
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Every firm below issues SOC 2 reports under AICPA SSAE 18 standards that US enterprise procurement accepts. Sponsored firms are paid placements, highlighted with a left rule. Pricing shown in USD (converted) for buyer comparison; we have UK firms' GBP estimates on the firm pages.
SOC 2 audits are remote-first, so any firm we track can serve UK buyers. Compare the best SOC 2 audit firms, browse every firm in the full SOC 2 auditor directory, or find SOC 2 auditors near you.
SOC 2 is a US attestation standard, and the audit runs entirely over video and shared evidence. These US firms serve UK-based companies remotely — no local office, often below local Big Four pricing.
Featured firms pay to appear first. Every firm here cleared our fit bar first; payment cannot add a firm or change its facts.
Compare the best SOC 2 audit firms or browse the full directory.
Tell us your scope once. We match it with UK firms and send 3–10 ballpark quotes back side by side.
We match firms to your scope and bring their ballpark quotes back. Free and anonymized.
UK auditors work your hours, know your data law, and bundle SOC 2 with ISO 27001 at 20–30% off the standalone price. The cases where a US auditor wins are narrow: IPO coordination with a Big Four, US operations large enough to need a local team, or a buyer's RFP that names a specific US firm.
Same-time-zone replies cut weeks off evidence-collection. GDPR + ICO understanding is native; US firms know the framework but not the case law. Bundling with ISO 27001 covers both US and EU procurement under one engagement; if you need help building the ISMS first, compare ISO 27001 consultants before you book the audit.
| Factor | UK-based | US-based |
|---|---|---|
| Type 2 cost | £12K – £55K | $15K – $450K |
| Time zone | GMT & BST · same-day | EST & PST · 12–24 h lag |
| GDPR & ICO | Native expertise | Framework only |
| ISO 27001 bundle | Common · discounted | Less common · full price |
| Timeline | 3 – 9 mo | 3 – 20 mo |
| Travel cost | None (local) | May apply for on-site |
Five stages, run end to end. Plan for 3–9 months from first scoping call to issued Type 2 report. Time-zone alignment, ISO bundling, and prior readiness work shrink it; manual evidence and Big Four engagement protocols expand it.
UK companies typically need SOC 2 when:
Type 2 is recommended for most UK companies targeting US enterprise sales. Type 1 may suffice for early-stage or exploratory market entry.
UK-based auditors are ideal for most situations. Consider US auditors only if:
UK companies can complete SOC 2 in 3–9 months with proper preparation and a responsive auditor. Add 4–8 weeks of readiness work if controls aren't yet in place.
Once your SOC 2 report is issued, use it to respond to security questionnaires, accelerate enterprise procurement cycles, differentiate from competitors without SOC 2, and build trust with US customers.
Four common questions from UK buyers — pricing, US-vs-UK choice, timeline, and the SOC 2 vs ISO 27001 question that comes up on almost every call.
Generally, yes. While you can use US auditors, UK-based auditors operate in your time zone (GMT/BST), understand UK data protection laws (GDPR), and can often bundle SOC 2 with ISO 27001 for dual compliance.
In 2026, typical costs for UK-based firms are: Specialist firms (£12K-£30K), National CPA firms (£25K-£50K), and Big Four firms (£50K-£120K+). Prices vary based on company size and scope.
Yes, and it is a legitimate path. SOC 2 is a US attestation standard delivered entirely remotely, and US specialists often cost less than a local Big Four audit. What you trade is time zone and local context: a UK firm works your hours and knows GDPR and ICO expectations first-hand. This page lists US firms that serve the UK remotely.
Type 1 audits typically take 2-6 weeks. Type 2 audits require an observation period of 3-12 months, plus 4-6 weeks for reporting. UK auditors can often fast-track the preparation phase.
No. SOC 2 audits are remote-first, so a firm's registered office rarely limits who it can serve. Firms on this page work with companies across the UK: London fintechs, Bristol SaaS teams, and businesses outside the major hubs alike. Time zone alignment and sector experience matter more than physical location.
SOC 2 attestation vs consulting · SOC 2 reports must be issued by licensed Certified Public Accountants (CPAs) under AICPA standards (SSAE 18). In the UK, only firms authorised by the AICPA or holding ICAEW practicing certificates can issue official SOC 2 attestation reports.
Verify credentials · many UK firms offer "SOC 2 consulting" or "SOC 2 preparation services" but cannot issue the actual attestation report. Confirm AICPA / ICAEW authorisation, SOC 2 attestation authority (not just consulting), and SSAE 18 conformance before signing.
Disclaimer · pricing estimates and timelines shown are approximations based on publicly available information and user-submitted data. Actual costs and timelines vary based on company size, complexity, and scope. This directory includes both licensed audit firms and consulting firms; always confirm attestation authority before signing contracts.
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