AICPA-authorised firms helping UK companies pass US enterprise procurement. Browse the 8 firms below, or tell us your scope and we'll send it to three that fit.
Five UK-based picks for the audits buyers actually run — tech startups, FinTech with DORA, mid-market, price-sensitive SaaS, and mid-tier FS/tech. Each recommendation names one firm with the qualifier that earned the pick.
Tempo Audits is the fastest, lowest-priced path for UK and European tech startups needing SOC 2 + ISO 27001 together — tech-stack-aware auditors, minimal documentation overhead, and a single 2–6 week engagement aimed at unblocking the first US enterprise contract.
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 — mid-tier pricing, financial services and technology depth, and a Forvis Mazars network that handles US/EU subsidiaries under one engagement.
Every firm below issues SOC 2 reports under AICPA SSAE 18 standards that US enterprise procurement accepts. Featured firms are highlighted with a left rule. Pricing shown in USD (converted) for buyer comparison; we have UK firms' GBP estimates on the firm pages.
Best for · UK SMEs needing SOC 2 preparation
Differentiator · SOC 2 readiness and preparation services
Best for · Mid-market and large private businesses across all sectors seeking comprehensive audit, tax, and advisory services from a nationally recognized firm.
Differentiator · World's fifth-largest accounting network with 8,000 UK professionals across 17 locations, offering deep sector specialisms and global reach within a cohesive organization.
Best for · Global enterprises needing SOC 1/2/3, ISAE 3402, ISAE 3000, or DORA compliance from an internationally recognized, independent assurance provider
Differentiator · Globally recognized standards body founded in 1901; operates in 60+ countries; combines SOC attestation with ISO certification expertise under one roof; supports DORA compliance for EU financial services; trusted by multinational clients worldwide
Best for · UK companies needing affordable fast compliance
Differentiator · Fast turnaround with cybersecurity focus
Best for · UK and EU companies expanding to US market needing SOC 2
Differentiator · UK-based with deep understanding of both US and EU compliance requirements
Best for · UK companies seeking efficient compliance
Differentiator · Efficient compliance with global network support
Best for · UK and European companies needing SOC 1/2, GDPR, ISAE 3402, cybersecurity assessments, and data privacy compliance with UK regulatory expertise
Differentiator · Part of Moore Kingston Smith (top-15 UK accounting firm); cybersecurity and data privacy specialists combining SOC attestation with GDPR compliance; dedicated Drata partner for the UK/EU market; extensive experience with charities and nonprofits alongside tech companies
Best for · European tech startups and scale-ups needing ISO 27001 and SOC 2 certification with minimal complexity, fast turnaround, and tech-stack-aware auditors
Differentiator · Founded by a tech company founder who lived the compliance experience firsthand; UKAS accredited; UK and Europe focused; remote-first with plain English communication; built specifically to celebrate and leverage Drata; competitive flat-fee pricing; trusted by fast-growing SaaS companies across Europe
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.
| 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), Mid-tier firms (£25K-£50K), and Big Four firms (£50K-£120K+). Prices vary based on company size and scope.
Yes, but be prepared for time zone differences and potentially higher fees. Most UK companies prefer UK-based auditors who are affiliated with the AICPA but offer local support.
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.
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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