Construction Accountants — Winchester

Specialist construction accountants in Winchester

Specialist construction accountants serving contractors and subcontractors across Winchester and Hampshire. From sole-director companies to growing main contractors — we understand CIS, VAT domestic reverse charge, job costing and the financial pressures unique to the construction industry.

CIS

Full Construction Industry Scheme compliance for contractors & subcontractors

VAT

Domestic Reverse Charge handled correctly — protecting your cash flow

Tax

Capital allowances, AIA and tax-efficient structures maximised

Jobs

Project-by-project profitability tracking so you know what's working

What You Need to Know

What every construction business in Winchester needs to get right

Construction has some of the most complex tax and compliance rules of any industry. Here's what we keep a close eye on for every client in the sector.

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CIS — Construction Industry Scheme

If you use subcontractors, you're likely a CIS contractor and must deduct tax at source (20% for registered, 30% for unregistered subs) and submit monthly returns to HMRC. Getting CIS wrong leads to penalties. We handle the full process.

High Priority
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VAT Domestic Reverse Charge (DRC)

Since March 2021, the VAT Domestic Reverse Charge applies to most B2B construction services. The customer (not supplier) accounts for the VAT. This has a major impact on cash flow and invoicing — and non-compliance carries serious HMRC penalties.

Legal Requirement
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Construction VAT Rates

Not all construction work is standard-rated. New residential builds are zero-rated, conversions and renovations of empty properties may qualify for 5%, and repairs are generally standard-rated at 20%. We make sure you're charging the right rate every time.

Compliance
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Capital Allowances & AIA

Plant, machinery, scaffolding, tools and vehicles all qualify for capital allowances. The Annual Investment Allowance (AIA) currently allows 100% relief up to £1m in year one. We ensure you're claiming every allowance you're entitled to.

Tax Savings
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Subcontractor vs Employee

HMRC pays close attention to employment status in construction. Incorrectly classifying employees as subcontractors can result in significant back-tax, NIC and penalties. We help you get the status right — and defend it if HMRC ever questions it.

Risk Management
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Job Costing & Project Profitability

Do you know which jobs make you money and which don't? We set up Xero to track costs and revenue by project, so you always know your margins. Understanding job profitability is the single biggest lever for growing a construction business.

Profitability

Retention Payments

Retentions held by main contractors are a common source of cash flow problems and accounting errors. We make sure retentions are correctly accounted for on your balance sheet and that you're actively chasing them before they become a write-off.

Cash Flow
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Vehicles & Plant Finance

Vans, lorries, diggers — whether purchased outright or on finance, the tax treatment varies. We ensure you're maximising allowances on assets, accounting for private use correctly, and structuring purchases in the most tax-efficient way.

Allowances
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Year-End & Corporation Tax

We prepare your statutory accounts and corporation tax return with construction-specific knowledge — making sure all deductible costs, subcontractor payments, plant depreciation and CIS deductions suffered are correctly treated.

Annual
Packages for Construction

Everything included, built for your industry

All packages include a Xero subscription (our recommended software) and are structured around the specific compliance requirements of construction businesses — CIS, DRC, job costing and beyond.

Construction pricing reflects the additional compliance complexity involved — CIS returns, domestic reverse charge VAT and job costing are all included as standard. View our standard packages →

Worth knowing

Every construction client gets Xero configured with a construction-specific chart of accounts — separating labour, materials, plant and subcontractor costs by project so your numbers are always meaningful.

Lite
The Lite Package
£200/month
Prices starting from
Core Inclusions
  • Xero set-up with construction chart of accounts (or your preferred software)
  • Quarterly MTD submissions
  • Statutory accounts & corporation tax
  • Monthly bank reconciliation (up to 50 transactions)
  • Email support
Construction Add-ons
  • Monthly CIS returns (as contractor)
  • CIS deduction suffered reclaim
  • VAT DRC compliance review
Get started
Complete
The Complete Package
£550/month
Prices starting from
Core Inclusions
  • Everything in Core
  • Monthly management accounts
  • Quarterly strategy & tax review meetings
  • Unlimited phone support
Construction Add-ons
  • Full project-by-project profitability reporting
  • Retention tracking & management
  • Plant & vehicle finance optimisation
  • Rolling cash flow forecast
  • Payroll for variable/subcontractor workforce
Get started
Why Lumi

Why choose Lumi as your construction accountant

CIS, DRC, retentions — we know the language. We work proactively to keep your compliance tight and your tax bill as low as legally possible.

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Plain English, no jargon

Construction is complicated enough. We give you clear, straight-talking advice — no acronym-soup, no unnecessary complexity. Just numbers that make sense and actions you can take.

CIS done properly

CIS is one of the most error-prone areas in construction accounting. We handle your monthly returns, verify subcontractor status and manage your deductions suffered — so HMRC never has cause to come knocking.

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Growth-focused advice

We don't just keep you compliant — we help you understand your numbers so you can win better jobs, price more accurately and scale sustainably. Your success is our success.

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One point of contact

You deal directly with a Chartered Accountant who knows your business. No call centres, no passing the buck. When you call, we pick up — or we call you back the same day.

Get Started

Ready to get your construction finances under control?

Book a free 30-minute call. We'll talk through your business, your CIS obligations and how we can take the financial admin off your plate.