Accountancy expertise
across every sector
We've worked alongside businesses in almost every industry. That breadth of experience means we understand your sector's specific challenges, tax obligations and growth opportunities — not just your numbers.
Accountancy for builders, contractors & tradespeople
The construction sector has unique and complex tax obligations — from CIS deductions and VAT domestic reverse charge to managing subcontractors and irregular cash flow. We know the industry inside out and keep your books clean so you can focus on the build.
Specialist tax advice for property investors & landlords
Property taxation is one of the most complex and fast-changing areas of UK tax law. From Section 24 mortgage interest restrictions to capital gains on disposal, we help landlords and property investors structure their affairs as efficiently as possible.
Accountancy for tech companies, startups & contractors
The technology sector moves fast and so does the tax landscape around it. Whether you're an IT contractor navigating IR35, a startup seeking R&D tax credits, or a growing SaaS business, we provide the financial clarity and strategic advice you need to scale with confidence.
Specialist accountancy for healthcare & medical professionals
Healthcare professionals — from GPs and dentists to consultants and therapists — face a uniquely complex tax environment. We understand NHS income structures, pension rules and the specific challenges of running a medical practice or operating as a locum.
Accountancy for retailers, shops & online sellers
Whether you operate a high street shop, an online store or sell across multiple platforms like Amazon and eBay, managing stock, VAT and multi-channel income requires careful bookkeeping and tax planning. We keep it simple and accurate.
Accountancy for restaurants, hotels, travel agencies & leisure businesses
Hospitality is one of the most cash-intensive and administratively demanding sectors to operate in. We help restaurants, bars, hotels, travel agencies and leisure businesses stay on top of their accounts, manage payroll across multiple staff and handle complex VAT arrangements.
Accountancy for lawyers, consultants & professional firms
Professional services firms — solicitors, surveyors, architects, management consultants and financial advisers — need an accountant who understands partnership structures, professional indemnity and billing models. Damien's Big Four background means we speak your language.
Accountancy for creatives, agencies & media businesses
Freelance income, royalties, project-based billing and creative industry tax reliefs make accountancy for the creative sector genuinely specialised. We work with designers, photographers, writers, production companies and advertising agencies to keep their finances in order.
Sector knowledge that
makes a real difference
Knowing your sector means we can spot opportunities and risks your previous accountant may have missed. Damien's 25+ years of experience — including four years as a Senior Manager at Deloitte — means no sector challenge is unfamiliar.
Meet Damien ›What our clients say
Businesses across West London and Surrey trust Harnett & Co to handle their numbers — whatever sector they're in.
Damien sorted our CIS returns and subcontractor payroll from day one. We'd been getting it wrong with our previous accountant — he fixed it immediately and saved us a significant amount in penalties.
I have a portfolio of six properties and Damien restructured the whole thing into a company. The tax savings were substantial — I wish I'd done it years earlier. The advice was clear and the execution was smooth.
As an IT contractor the IR35 rules were a minefield. Damien gave us a clear, confident assessment and put the right structure in place. He's responsive, direct and knows his stuff inside out.
Don't see your sector?
We'd still love to help.
We work with businesses across a wide range of industries. Whatever your sector, get in touch and we'll tell you exactly how we can support your business.