Most people starting a car business in the UK begin in one of four places: mobile mechanic, a small garage doing servicing and repairs, valeting and detailing, or buying and selling used cars in small numbers. None of them needs a licence to begin, but all of them need a motor trade insurance policy, and car sales carries a rule that catches people out — offering finance, or passing customers to a finance company, is a regulated activity.
At a glance
| Feature | Detail |
|---|---|
| Cheapest start | Valeting — kit, water, a van and a pressure washer |
| Lowest overheads | Mobile mechanic — you use the customer's driveway, not a workshop |
| Highest capital need | Car sales — you have to buy the stock before you sell it |
| Insurance you need | A motor trade policy; ordinary car or van cover will not do |
| The regulated bit | Selling on finance or introducing customers to a lender |
| Where customers come from | Local search and Facebook, plus reviews and repeat servicing |
Four realistic ways in
Mobile mechanic. Servicing, brakes, diagnostics, clutches and batteries at the customer's home or workplace. No premises, no rent, and the convenience is the selling point. The limit is what you can safely do on a driveway. This page sits inside our wider guide to starting a business.
A garage doing servicing and repairs. Better margins, a ramp, and customers who come back every year. It also means rent, rates, waste contracts and equipment before you have earned anything. Many mechanics go mobile first and take a unit once the customer list justifies it.
Valeting and detailing. The cheapest way in. Valeting is volume work at modest prices; detailing is slow, skilled and paid well — paint correction, ceramic coatings and protection. Detailing needs a covered, lit space, so it is less mobile than it looks.
Small-scale car sales. Buying used cars at auction or from the trade, preparing them, and selling them on. It is a working-capital business before it is a car business: every car you own is money you cannot spend until it sells. Start with a handful of cars, not a forecourt.
Qualifications, licences and the rules that apply
There is no single licence for working on cars, but several specific rules apply depending on what you do.
Servicing and repair needs no legal qualification, though customers and insurers take recognised motor industry qualifications seriously.
MOT testing is different. The premises must be an approved test station and the tester must be authorised by DVSA, with training and ongoing assessment.
Vehicle air conditioning work requires the right refrigerant handling certification.
Waste. Old oil, filters, tyres, brake fluid and coolant are controlled waste, so you have to register and use a licensed disposal route. Valeting has its own version: chemical-laden water should not go down a surface drain.
Selling cars on finance is regulated
If you sell cars on finance, or you introduce customers to a lender or broker who arranges finance for them, that is a regulated activity under UK financial services rules. You either need to be authorised by the FCA yourself, or to become an appointed representative of a firm that already is; dealers whose main business is selling vehicles usually apply for the FCA's limited permission route. Doing it without either is not a paperwork slip; it is trading without permission.
Most small dealers work under an existing authorised firm rather than seek their own permission, because the compliance burden is lighter. What that involves and what it costs varies.
This is general information, not legal or regulatory advice. Before you offer finance to a single customer, check your position with the FCA or a compliance adviser.
Insurance, and what you owe the customer
A motor trade policy is the right cover, not ordinary car or van insurance. Road risks cover lets you drive customers' vehicles and your own stock on the road. A combined policy adds premises, tools, stock and public liability. Employers' liability becomes a legal requirement once you have staff. Our insurance guide explains the types.
Selling used cars comes with consumer rights attached. A car sold by a trader has to be of satisfactory quality, fit for purpose and as described, and the buyer has a short-term right to reject it if it is not, then rights to a repair or replacement. So price in the cost of putting things right, because some cars will come back. And never advertise a trade car as a private sale — it is misleading, and it does not remove the obligations anyway.
What it costs to start
Valeting is the cheapest: a van, a pressure washer, a water tank, a machine polisher, chemicals and a vacuum. Mobile mechanic adds a tool set, a diagnostic reader and a technical data subscription, which is a monthly cost people forget. A garage adds rent, rates, a ramp and waste contracts. Car sales needs stock money above everything else, plus preparation on every car.
Running costs share the same shape: the van and everything with it — finance or lease payment, fuel, motor trade insurance, servicing, tyres, road tax and breakdown cover — plus consumables, waste disposal, software, phone and an accountant.
What to charge, and what you would actually earn
Labour is sold by the hour or as a fixed price per job, and rates vary by area and by how specialist the work is. Parts are usually sold on at a margin. Build your own rate from your costs and the hours you can genuinely bill. Our pricing guide does the arithmetic.
Take Marcus, a mobile mechanic starting out in Bristol. He charges £55 an hour for labour. He is out of the house 45 hours a week, but he only bills around 22 of them — the rest goes on driving between jobs, fetching parts, quoting, and diagnosing faults that turn out to be nothing. That is £1,210 a week, so around £4,600 a month of sales averaged across the year, plus a little margin on parts.
Then the costs come off: the van payment, fuel, motor trade insurance, servicing and tyres, tools and diagnostic subscriptions, waste disposal, phone and an accountant — call it £1,200 to £1,400 a month. That leaves Marcus around £3,300 a month before tax, roughly £40,000 a year of profit, and somewhere near £2,750 a month once income tax and National Insurance have gone. It works because the £55 rate was set to carry the van.
Getting your first customers
Car work is won locally and kept by trust, because most people would rather never think about their car again.
Local search does the heavy lifting. "Mobile mechanic near me" and "car detailing [town]" are how this work gets found, and a free Google Business Profile with real reviews decides who gets the call. Ask every customer for a review while the fault is still fixed.
Facebook is the platform for mechanics and valeting — local groups are where "can anyone recommend a mechanic?" gets asked, and a page with your area and your prices answers it. Detailing is the exception: it is visual work, before-and-after photos sell it, and Instagram is worth the effort there.
Servicing repeats every year, so a simple reminder to last year's customers costs nothing and fills the diary. Our guide to marketing a small business covers local search and reviews properly. Want help getting customers? Our sister agency The Fractions runs ads and builds websites for small UK businesses — the pages, the ads and the enquiries behind them.
The admin
Most people start as sole traders: register with HMRC, keep records of what comes in and what goes out, and file a Self Assessment return. Car sales more often goes limited, because the stock and the liabilities are bigger — our structures guide covers when that makes sense.
Two things are specific to this trade. Used car sales has its own VAT treatment, worth an accountant's ten minutes before you start. And the DVLA paperwork on every car you buy or sell has to be done properly and on time.
Turning this into a plan
A car business plan is your labour rate, the hours you can realistically bill, parts margin, the van and all of its costs, and the month it covers your bills. If you are selling cars, add the number that decides everything: how much money is tied up in stock and how long a car takes to sell.
Create a mini business plan in minutes with Plan.business. Put in your rate, your hours and your costs, and it works out the rest — what you will make, when you break even, and what you need to charge to hit your target.
Frequently asked questions
Do I need a qualification to be a mobile mechanic? No legal qualification is required to service and repair cars in the UK, but recognised motor industry qualifications matter to customers and insurers. Some jobs do carry requirements — MOT testing and vehicle air conditioning work both need approval or certification.
What insurance do I need for a car business? A motor trade policy, not ordinary car or van insurance. Road risks cover lets you drive customers' cars and your stock; a combined policy adds premises, tools, stock and public liability. Employers' liability is a legal requirement once you have staff.
Do I need FCA authorisation to sell cars on finance? If you sell cars on finance or introduce customers to a lender, that is a regulated activity. You need FCA authorisation (usually the limited permission route), or to be an appointed representative of an authorised firm. Most small dealers work under an existing authorised firm. Check your position before offering finance to anyone.
How much can you make selling used cars? It comes down to margin per car and how fast cars sell, not how many you own. Every unsold car is money sitting still, and preparation, warranty work and the odd return come out of the margin. Work out your realistic profit per car and sales per month before you buy stock.
Is car valeting or detailing more profitable? Valeting is volume work at low prices with fast turnaround; detailing is slower, skilled and priced far higher per car. Detailing usually earns more per day once you can show the work, but it needs a covered space, better kit and customers who care about paintwork.
Figures correct as of September 2026. Tax thresholds, fees and rates change; check the linked GOV.UK pages before acting. Prices and costs shown are indicative and vary by area and by what's included.
What is Plan?
Plan is a free business operating system for people starting or newly running a UK business. It walks you, one simple step at a time, from your elevator pitch through brand, product and pricing, to a complete business plan — then uses everything it now knows about the business to help with the basics: logo and brand, marketing, a website, a bank account, funding, insurance, company registration. You can use as much or as little as you want.
Two ways to do this
Do it yourself, free. Plan walks you through the numbers — your labour rate, your billable hours, the van, the stock — one short question at a time, in your browser. Do just this bit and stop there if that is all you need.
Or get the money side sorted. The van and the stock are the two things that need paying for before you earn anything. See your funding options with SMEmoney. SMEmoney, powered by Swoopfunding, lets you view, compare and apply for funding in one place — from startup loans and asset finance to invoice finance, credit lines and grants. Funding has to be repaid and it costs money, eligibility depends on your circumstances, and personal guarantees are common in small-business lending, so read the terms before you commit.