Quick answer
The working rule for UK small businesses in 2026: spend 2 to 5% of revenue to maintain your current position and 5 to 10% to grow, with new businesses often needing 10%+ of target revenue for their first 18 months. On £150,000 turnover, that is roughly £250 to £1,250 per month. Where you spend it matters far more than the headline number.
Why the percentages are only half the story
Budget percentages are borrowed from big-company marketing, where money buys reach. Under £1m turnover the game is different: your constraint is usually not reach but conversion and repetition: being findable for the searches that matter, looking credible when found, and staying in front of past customers who already trust you. That is why two businesses spending the same 5% get wildly different results: one buys ads pointing at a website that doesn’t convert; the other fixes the website first and lets every later pound work twice as hard.
So treat the percentage as a ceiling, and sequence as the strategy. The order below is the highest-return sequence we see across hundreds of UK small businesses.
The spending sequence that actually compounds
1. A website that converts (foundation, not marketing)
Before any promotion, the destination has to work: loads in under 3 seconds, looks legitimate on a phone, shows real work and reviews, and makes contact effortless. A one-page website from £299 or a custom build from £499 is a one-off cost that upgrades the return on every future marketing pound. Running ads to a weak website is the most common budget leak in small business marketing.
2. Local visibility and reviews (£0 to £249/month)
For service businesses, the Google Business Profile and a steady flow of reviews outperform almost everything per pound. The profile is free; the discipline of asking every happy customer for a review costs nothing but consistency. Structured SEO support from £249/month makes sense once the free layer is genuinely maxed.
3. Email to people who already know you (near-free)
Past customers are the cheapest revenue you will ever reach: no acquisition cost, existing trust. A monthly email with recent work, a seasonal reminder or a referral nudge routinely beats cold advertising on return, and email marketing scales from near-zero cost.
4. Paid ads: only after 1 to 3 are true
Ads are an amplifier, not a foundation. They work when the economics work: if an average job is worth £300+ and your website converts, Google Ads on exact-intent searches can be excellent. If either condition fails, ads burn the budget fastest of all.
Worked examples at three turnover levels
| Turnover | Maintain (2 to 5%) | Grow (5 to 10%) | Sensible first allocation |
|---|---|---|---|
| £60,000 (sole trader) | £100 to £250/mo | £250 to £500/mo | Website one-off, then reviews + email; ads only for emergency capacity |
| £150,000 | £250 to £625/mo | £625 to £1,250/mo | Website + local SEO retainer + monthly email; test ads at £10 to 15/day |
| £500,000 | £800 to £2,000/mo | £2,000 to £4,000/mo | All of the above + content/SEO programme + managed ads with tracking |
What to cut first when money is tight
- Paid ads without measured returns. If you cannot name the cost per enquiry, pause and measure before spending again.
- Posting on every social platform. One platform your customers actually use beats four maintained badly.
- Directory subscriptions that never ring. Track which ones produce; cancel the rest without sentiment.
Never cut: the website’s hosting and upkeep, review collection, and email to past customers (the three cheapest sources of work you have). For a sense of what professional support costs across the board, see our guide to UK marketing agency prices.
Seasonal weighting: spend when customers decide
A flat monthly budget is easy to admin and wrong for most small businesses. Demand is lumpy (trades peak in spring and early autumn, retail before Christmas, accountants in January), and marketing works best slightly ahead of the peak, when customers are starting to research but haven’t chosen. A simple weighting that beats flat spending: identify your two busiest months, and raise the budget for the six weeks before each by 50%, funded by cutting the two dead months to near-zero (keep only the always-on basics: hosting, reviews, email).
The exception is SEO and content, which compound too slowly to time; those stay steady all year and pay out in whichever month customers search.
The one-page tracking sheet that keeps budgets honest
You cannot manage what nobody writes down. This five-line monthly sheet takes ten minutes and beats most agency dashboards for decision-making:
| Line | What to record | Decision it drives |
|---|---|---|
| Spend by channel | Every pound, including subscriptions you forgot | What you’re actually betting on |
| Enquiries by source | Ask every enquiry “how did you find us?” and log it | Which channels produce, not which are fashionable |
| Quotes sent / jobs won | Simple counts | Whether the problem is leads or conversion |
| Cost per enquiry | Spend ÷ enquiries, per channel | What to cut first when money tightens |
| Best customer source | Where this month’s biggest job came from | Where doubling down actually pays |
Three months of this sheet answers the questions this guide can only generalise about: your business’s real numbers beat any industry benchmark. And when a channel earns its place for a quarter, that’s the moment to formalise it, whether that’s an email programme or structured SEO.
Worked example: £500/month, three ways
To make the sequencing concrete, here is the same £500/month spent by three different owners of a similar trades business:
Owner A: the ads-first trap. £500 straight into Google Ads pointing at a dated DIY website. Clicks arrive, enquiries don’t; the website leaks the spend. Six months in: ~£3,000 spent, a handful of jobs, conclusion “marketing doesn’t work”. The budget was fine — the order was wrong.
Owner B: the foundation-first path. Months one and two go on a converting one-page website (£299) and a Google Business Profile overhaul plus review habit (£0 but consistent). Months three onwards: £249 into structured local SEO, the rest into a monthly email to past customers. Six months in: the free layer produces steadily, the paid layer compounds, and every later pound lands on a site that converts.
Owner C: the scattergun. £100 each across five channels, none given enough weight to move. Everything underperforms; nothing gets cut because nothing was measured. This pattern spends the same money as Owner B for a fraction of the return. Diffusion, not volume, is the failure.
The lesson compresses to one sentence: sequence beats size. A £300 budget in the right order outperforms £1,000 in the wrong one.
When to break the percentage rules
- Launching: the 2 to 10% guidance assumes existing revenue. New businesses should budget from target revenue instead, accepting 12 to 18 months of investment-phase spending.
- At capacity: if you’re booked two months out, cutting acquisition spend to near-zero and shifting budget to price rises, reviews and retention is the rational move; spending to generate enquiries you must refuse only buys annoyance.
- A competitor exits: when a local rival closes, a temporary spend spike to capture their orphaned customers pays back faster than any normal month — the searches are happening either way.
Get the UK SME Marketing Budget Worksheet (free)
A printable worksheet for setting a realistic UK marketing budget and splitting it across SEO, paid ads, content and email.
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Sources & Further Reading
- Business population estimates, GOV.UK / DBT
- UK business services data, Office for National Statistics
- UK online behaviour research, Ofcom
Frequently asked questions
What percentage of revenue should a small business spend on marketing? +
UK small businesses typically spend 2 to 5% of revenue to maintain their position and 5 to 10% to grow. New businesses often need 10%+ of target revenue for the first 12 to 18 months while building visibility from zero.
What is a realistic marketing budget for a £150k turnover business? +
Roughly £250 to £625/month to maintain and £625 to £1,250/month to grow. Sequence matters more than size: a converting website first, then local SEO and reviews, then email, then paid ads.
What marketing gives the best ROI for small businesses? +
For most UK service businesses: a fast, credible website; a well-maintained Google Business Profile with steady reviews; and regular email to past customers. All three are cheap relative to the revenue they produce.
Should a small business spend on ads or SEO first? +
Fix conversion first (website, reviews), then SEO for durable visibility, then ads as an amplifier. Ads produce instant traffic but stop the moment spending stops; SEO compounds.
How do I know if my marketing budget is working? +
Track one number per channel: enquiries and their source each month. If a channel cannot show enquiries after 90 days at sensible spend, reallocate it. Free analytics and simple "how did you hear about us?" logging cover most small businesses.
