How to Buy a Contractor Business in the UK: The Complete Guide

If you want to buy a contractor business in the UK, the good news is that the fundamentals are simple: find a business with provable profit, pay a sensible multiple of it, and verify everything before you sign. The hard part is that UK contracting has its own moving parts - CIS status, work-in-progress, retentions, TUPE - that generic "how to buy a business" advice never covers. This guide walks the whole journey end to end, with the UK-specific checks built in where they belong.

Why buy an established contractor business

Starting a contracting firm from zero means years of building a customer base, a subcontractor network, accreditations and a reputation before the business pays you properly. Buying an established one means you inherit all of that on day one: live contracts, a pipeline, crews who know the work, and cash flow from the first month. You pay for the head start - UK trade and contracting businesses typically change hands at around 2x to 3.5x adjusted annual profit - but you skip the stage where most new contractors fail.

The whole game is buying a sound business at a fair multiple, not a cheap one with hidden problems. Everything below is about telling those two apart.

Where to find contractor businesses for sale

Good contracting businesses rarely sell with a sign in the window. Owners sell quietly, through blind listings that show the numbers and the story but never the company name - because a leaked sale unsettles staff, customers and main contractors. So look where confidential listings live: marketplaces and brokers rather than word of mouth. You can browse the current contractor businesses for sale in the UK on ContractorExit and filter by trade, price and revenue - every listing is blind, with full financials shared once you enquire and sign an NDA.

When you scan listings, look past the headline turnover and ask what kind of revenue it is: recurring maintenance and framework work, or one-off projects the owner wins by personal reputation? That single distinction drives most of the price, as we cover in our UK contracting valuation guide.

Understand the numbers before you view anything

Buyers pay for profit, not turnover. A groundworks firm turning over £2m and keeping £90k is worth far less than one turning over £800k and keeping £250k. The figure to anchor on is the adjusted profit (often called SDE - seller's discretionary earnings): net profit, plus the owner's salary, plus personal expenses run through the business, plus genuine one-off costs. That is the number the multiple applies to.

• Owner-dependent, project-only firms sit at the bottom of the range - around 2x adjusted profit.
• Systemised firms with contracted, recurring work and a manager or supervisors running delivery sit at the top - 3x to 3.5x and sometimes beyond.

Sanity-check every asking price against that range. If it is far outside, there should be a visible reason.

UK due diligence: the checks that actually matter

Once an offer is agreed in principle, due diligence is where you verify the story. For a UK contracting business, these are the checks that separate professionals from tourists.

1. CIS and HMRC standing

If the business works in construction, it lives inside the Construction Industry Scheme (CIS). Two things to verify:

• Gross payment status. A subcontracting business with CIS gross payment status is paid in full by contractors, rather than having 20% deducted at source - a material cash-flow advantage. HMRC grants it on a compliance test (returns and payments up to date, including VAT since April 2024) and a turnover test: broadly £30,000 of net construction turnover for a sole trader, £30,000 per partner or director, or £100,000 for the whole company. Confirm the status is held, and that the compliance record that keeps it is clean - HMRC reviews it and can withdraw it.
• CIS records and returns. Monthly CIS returns filed on time, subcontractors verified correctly, and deductions accounted for. Sloppy CIS administration is both a penalty risk and a tell about the rest of the paperwork.

Ask for confirmation that PAYE, VAT and corporation tax are all current. Any HMRC arrears or time-to-pay arrangement needs to be on the table before you price the deal.

2. Work-in-progress, applications and retentions

Contracting profit hides in the balance sheet. Three items need real scrutiny:

• Work-in-progress (WIP). How much work has been done but not yet invoiced, and how has it been valued? Overstated WIP inflates profit. Ask for a job-by-job WIP schedule and test a sample against site records and subsequent invoicing.
• Applications for payment. On commercial work, money is applied for and certified before it is invoiced. Understand what has been applied for, what has been certified, and where the gaps are.
• Retentions. Money held back by clients until defects periods end. It is an asset, but an uncertain one - age it, and discount old retentions you may never collect.

3. The contracts pipeline

The order book is what you are really buying. Get the forward pipeline in writing: signed contracts and frameworks, their remaining value and duration, and whether they survive a change of ownership - some contracts and framework places have change-of-control or assignment clauses. Then check concentration: if one main contractor or client is 40% of revenue, price that risk in. Recurring maintenance contracts with housing associations, facilities managers or commercial landlords are the gold standard, because they turn next year's revenue from a hope into a schedule.

4. Staff - and TUPE if you buy the assets

A contracting business is its workforce. Map who holds the qualifications the business trades on (Gas Safe, NICEIC/NAPIT, SSSTS/SMSTS, CSCS), who runs jobs day to day, and how long they have been there. Then understand the legal side: if you buy the business and assets rather than the company's shares, the TUPE regulations (Transfer of Undertakings (Protection of Employment) Regulations 2006) almost certainly apply - employees transfer to you automatically on their existing terms, with continuity of service, and both seller and buyer have duties to inform and consult. If you buy the shares, the employer never changes, so TUPE is not triggered. Either way, the people come with the deal - plan for keeping them, because a buyer who loses the supervisors has bought a van fleet, not a business.

5. Owner-dependence - the value killer

Ask the one question that matters most: what stops when the owner stops? If the owner prices every job, holds every client relationship and personally holds the key accreditations, you are buying a job with stock, and the price should say so. Look for estimators, supervisors and office staff who can run the machine, documented processes, and customers whose relationship is with the firm rather than the founder. A month of owner absence the business barely noticed is worth more than any brochure.

6. Accreditations, insurance and compliance

Check the trade and safety accreditations the work depends on - CHAS, Constructionline, SafeContractor, trade-body memberships - are current and will survive the transfer. Review employer's liability and public liability insurance, any past claims, and the health and safety record including RIDDOR reportables. Main contractors audit this; so should you.

Share purchase or asset purchase?

UK deals complete one of two ways, and the choice shapes your risk:

• Share purchase. You buy the company itself - contracts, accreditations and staff stay exactly where they are, which is cleaner for continuity. But you inherit the company's whole history, known and unknown, so warranties, indemnities and thorough diligence matter more. Stamp duty on UK shares is 0.5% of the price.
• Asset purchase. You buy the trade and assets into your own company and leave historic liabilities behind. Cleaner risk, but contracts may need re-signing or assigning, accreditations reapplying for - and TUPE transfers the staff to you, as above.

Neither is "better" - it is deal-by-deal, and it is exactly what your solicitor and accountant earn their fees on. Do not complete a business purchase on a template contract.

Funding the purchase

You rarely need the full price in cash. Common structures in UK trade deals include bank or acquisition finance secured on the business, asset finance against vehicles and plant, and deferred consideration or seller financing - part of the price paid over time out of the business's own cash flow, which also keeps the seller invested in a clean handover. Whatever the structure, keep a working-capital reserve: payroll, materials and CIS obligations carry on while your first applications are still being certified. Three to six months of operating costs in reserve turns a slow first quarter into an inconvenience rather than a crisis.

From offer to completion

1. Enquire on a blind listing and sign the NDA to see the full financials.
2. Agree heads of terms - headline price and structure, subject to diligence.
3. Run due diligence - the checklist above, with your accountant on the numbers and your solicitor on contracts and TUPE.
4. Complete - sale agreement signed, funds moved, and a handover period agreed (a few weeks to a few months of the seller introducing clients and passing on what is in their head).

Sellers thinking about the other side of this table should read our guide on how to sell a contracting business in the UK - knowing what a prepared seller looks like tells you, as a buyer, exactly what "well run" should look like on paper.

Start looking

The buyers who do well buy on fundamentals: provable profit, contracted revenue, a workforce that stays, and clean CIS and HMRC records. Everything else is paint. When you are ready, browse contractor businesses for sale across the UK - blind listings with the full numbers, from owner-operator firms to multi-crew platforms - and enquire on the ones whose fundamentals hold up.