London — Mayfair
Chartered Accountants in London
Mayfair office serving London businesses and international clients
Our London office sits at 13 Hanover Square in Mayfair — one of the capital's most prestigious business addresses — giving Opus clients access to partner-led accountancy at the heart of London's financial and professional services community. Whether you're a founder scaling a West End business, a family office managing complex wealth, or an international company looking for cross-border financial expertise, our Mayfair office brings the same rigorous, personalised approach that has defined Opus Accountancy since 1976.
London's business landscape demands accountants who move quickly and think strategically. We work with tech companies navigating their first rounds of funding, professional services practices managing partner remuneration, and consumer brands building omnichannel operations. Our London team understands the pressures unique to the capital — from sky-high operating costs and competitive talent markets to the regulatory complexity that comes with trading internationally.
For businesses with operations in multiple jurisdictions, our cross-border expertise is invaluable. Opus has guided businesses through US-UK corporate structures, advised on transfer pricing, and supported founders through cross-border exits — bringing rigour to situations that demand more than a standard accountancy firm can offer. If you need a chartered accountant in Mayfair who genuinely understands international business, you've found the right partner.
Our Opus Counsel — On-Demand Finance Director service is particularly popular with London-based clients: a fully embedded finance function that scales with your business, without the cost or complexity of building an in-house team. Paired with our exit planning advisory, it means London founders can focus on growth while Opus manages the financial infrastructure around them.
If you're looking for an accountant in London who combines strategic thinking with genuine accessibility — where you speak to the same senior adviser every time — we'd love to talk.
Services Available from Our London Office
Accounting and Compliance
Management accounts and reporting designed for the pace of London business.
Business Advisory
Strategic advice from advisers experienced in London's tech, finance, and professional services sectors.
Opus Counsel — On-Demand Finance Director
A complete finance function for growing London businesses — from bookkeeping through to board-level reporting.
Tax Planning
UK and cross-border tax planning for internationally active businesses and high-net-worth individuals.
Exit Planning
Preparing London founders for business sales, MBOs, and succession — maximising value at every stage.
What London Clients Say
"My team and I know that we can pick up the phone and speak to our dedicated client manager for advice and guidance."
"They were professional, responsive and efficient in taking our business to the next level."