Construction Accountants for UK Contractors
Running a construction business is tough. CIS returns, subcontractors, payroll, VAT – the admin adds up fast. At Simplex, we take care of it all. You get expert advice, clear reporting, and unlimited support, so you can focus on building, not bookkeeping.
CIS & Payroll Done Right
We manage your monthly CIS returns, verify subcontractors, and submit all reports on time. You stay compliant – with no admin burden.
Real-Time Financial Oversight
Get clear insights into costs, margins, and cash flow with Xero and construction-friendly apps. We tailor your reports to your projects.
Unlimited Personal Support
Need quick advice on a late payer or staffing cost? Call, text or email us anytime – it’s all included, with a 48-hour response guarantee.
Built for Construction Business Owners
Whether you run a crew or manage multiple sites, we’ve got your back:
✅ Monthly CIS returns, verified & submitted
✅ Real-time cash flow & cost tracking via Xero
✅ Payroll for staff & subcontractor payments
✅ Fixed fees – no hourly charges
✅ Unlimited phone, text & email support
Opening hours: 9am – 6pm | Replies within 48 hours
Accounting That Works the Way You Do
Simple, personalised support – so you can get back to the job at hand.
Simplex keeps your records up to date, fully compliant and ready for tax season. Whether you’re just starting out or scaling fast, we take care of the numbers so you can focus on the work you enjoy, without the stress of doing it all yourself.
Smart Tools, Simple Setup
At Simplex, we set you up with the right tools — like any good toolkit, everything has its place and purpose. We’ll get you connected, show you how it all works, and keep things running smoothly behind the scenes.
Xero
Your financial control centre.
Track your income, expenses and VAT in real time. Xero keeps everything organised, connected to your bank, and easy to access anytime.
Brightpay
Payroll made painless.
Run payroll with ease. BrightPay handles payslips, pensions and HMRC submissions – fully compliant and completely stress-free.
dext
Receipts and records, sorted.
Snap receipts and email invoices straight into your accounts with Dext. No paperwork, no chasing — just clean, accurate records ready to reconcile.
simpro
Smart job management, made simple.
Manage every part of your projects, from estimates to invoicing, all in one place. Simpro
helps you streamline operations, cut down on admin, and improve visibility across your jobs.
As a certified Simpro partner, we’ll guide you through setup or connect you directly with their
expert team so you can get the most from the platform.
Interested in Simpro?
We’ll arrange a free introduction call.
What It’s Like Working With Simplex
You deserve more than a once-a-year accountant. At Simplex, we stay close to your business year-round — with personal support, proactive guidance and no extra charges for picking up the phone. You’ll never be left wondering who to call or what’s going on.
Trusted by UK Businesses Nationwide
We’re proud to be the 2022 Xero Sole Practitioner of the Year and South East Young Entrepreneur of the Year – but even prouder of our client results.
“Made the whole process very easy.”
Tom, Contractor
“Lucy is very efficient at her job and made the whole process very easy and effortless. Any answers that I needed she was able to give and was more than happy to help whenever I had an issue.”
“Lucy has been a godsend for our company.”
Jeanette, Construction Firm Director
“She is professional, trustworthy, competent and friendly. She has dealt with many problems for us with a positive result. She is always available to answer any queries and deals with problems very quickly. We would highly recommend her services.”
“We couldn’t ask
for more.”
Neil, Construction Business Owner
“I cannot recommend Simplex enough. Lucy has been so helpful, and got me sorted when my accounts were in such a mess! She explained everything to me, and has just made the entire process so easy. As a small business owner, having someone like Lucy helping me is exactly what you need!”
Getting Started is Easy!
We’ve made it simple for you to get the help you need:
Book a Free Call
Tell us about your business and what you need.
Send Your Info
Share your financial details securely online.
We Do the Work
We’ll sort your accounts and keep everything up to date.
Stay in Control
Get updates and support, so you always know where you stand.
Book your free discovery call! It will only take a minute
Switching Accountants is Easier Than You Think
Not getting the support you need? Or just ready for something better?
Moving to Simplex is straightforward. We’ll handle the switch behind the scenes — no awkward calls, no chasing documents, and no disruption to your day-to-day. You stay focused on your business, and we’ll take care of the rest.
Seamless Transfer
We contact your previous accountant and securely move everything over, CIS, VAT, payroll and more.
No Disruption
Your accounts stay up to date while we handle the switch, so nothing gets missed.
A Fresh Start
We review your numbers, identify gaps, and get you set up with a clear plan that works for you.
Ready to switch?
Get in touch today and let’s make it happen!
Accountancy Blog Posts
Your Questions, Answered
We know you might have some questions, and we’re here to make everything as clear and straightforward as possible. If you need more information, don’t hesitate to reach out—we’re always happy to help!
Construction accounting covers all the usual accounting services—like tax returns, payroll, VAT, and bookkeeping—with added focus on the needs of construction businesses. That includes CIS, dealing with subcontractors, and helping you stay compliant with HMRC. At Simplex, we take care of all of that, so you can focus on running your business.
A construction accountant does everything a general accountant does, with extra support for the construction industry. That includes submitting CIS returns, managing subcontractor records, and making sure your tax and VAT are sorted correctly. We also keep your accounts tidy and help you meet all your deadlines.
A CIS accountant helps contractors and subcontractors meet their duties under the Construction Industry Scheme. That means registering with HMRC, verifying subcontractors, submitting monthly CIS returns, and handling deductions correctly. At Simplex, we manage this for you—making compliance simple and stress-free.
Fees vary depending on what services you need. A contractor might pay from £50 to £100+ per month, depending on whether you’re a sole trader or limited company, and whether you need CIS support. At Simplex, we offer fixed monthly fees from £25 per month with no surprises.
Most small construction businesses use either cash basis or traditional accrual accounting. We’ll advise you on the best method based on your business structure. All your records are managed through secure cloud software like Xero—giving you easy access and clear, up-to-date figures.
A project accountant focuses on the financials of individual jobs—but that’s not a service we offer. At Simplex, we provide complete accounting and CIS support for your construction business, without tracking individual project-level costs.
It’s simple! Just schedule a free consultation with us, and we’ll discuss your needs and how we can help with your bookkeeping and accounting.