How Much Should a Small Business Spend on Advertising?

You’re staring at your accounts, wondering whether the £300 you spent on Facebook ads was genius or idiocy — and whether you should spend £3,000 next month. Figuring out how much a small business should spend on advertising is one of those questions with no single answer, but there are solid benchmarks, and most small businesses get it wrong in predictable ways: spending too little to work, spending on the wrong channels, or spending with no way to measure results.

Let’s establish the benchmarks, then talk about spending it wisely.

Small Business Advertising Spend: The Benchmarks

The percentage rules

• New businesses (under 5 years): 7–10% of projected revenue. You’re buying awareness from zero — it costs more to become known than to stay known
• Established businesses: 3–5% of revenue for maintenance and steady growth
• Aggressive growth mode: 10–15% — you’re buying market share and should expect lower short-term profit
• B2B services: Typically 2–5% (relationships and referrals do heavy lifting)
• B2C retail/e-commerce: Typically 5–12% (you’re buying every customer)
• Restaurants/hospitality: 3–6% (location and reviews matter as much as ads)

On £100,000 revenue, that’s £3,000–£10,000/year — £250–£800/month. If that sounds like a lot, remember: it’s not “spending,” it’s customer acquisition with measurable returns. The Federation of Small Businesses regularly surveys members on marketing spend — the data consistently shows growing businesses spend more, not less, on marketing.

The sanity check that matters more than percentages

Forget benchmarks for a moment. The real question: what does a customer cost to acquire, and what are they worth?

• Customer Acquisition Cost (CAC): Total marketing spend ÷ new customers acquired. If £500 of ads brings 25 customers, CAC = £20
• Customer Lifetime Value (CLV): Average spend × purchase frequency × relationship length. A café customer spending £6/week for 2 years = £624 CLV
• The rule: CLV should be at least 3× CAC. £624 CLV vs £20 CAC = spend more. £40 CLV vs £35 CAC = stop immediately

Calculate these two numbers and the “how much” question answers itself: spend as much as you can while CAC stays below one-third of CLV.

Where to Spend It (Highest ROI First)

1. Your Google Business Profile and reviews (£0)

Not advertising spend, but it amplifies everything else. Our guide on getting Google reviews covers the system — do this before spending a penny on ads.

2. Hyper-local social ads (£100–£500/month)

Facebook/Instagram ads targeted to a tight radius around your business remain the best value in local advertising. £5–£15/day with specific offers (“New customers: 20% off this month”) to people within 3 miles. Track cost per enquiry religiously — kill what doesn’t convert within two weeks.

3. Google Ads for high-intent searches (£200–£1,000/month)

Someone searching “emergency plumber Leeds” is ready to buy — Google Ads captures that intent. Expensive per click (£2–£15 in competitive trades), but conversion rates are high. Start small (£10/day), use exact-match keywords, and send traffic to a page with your phone number prominent. If cost-per-acquisition exceeds your CLV ratio, pause and fix the landing page before increasing spend.

4. Retargeting (£50–£200/month)

The cheapest paid advertising there is: showing ads to people who already visited your website. They’re warm leads — conversion rates 3–5× higher than cold traffic. Every business with a website should run basic retargeting. It’s the closest thing to free money in advertising.

5. Local partnerships and sponsorships (£100–£500/year)

Football team shirts, school fete sponsorship, community event presence. Hard to measure precisely, but the goodwill compounds — and our cheap local marketing guide details the tactics.

How to Split the Budget

A sensible starting allocation for a local B2C business:

• 40% — Digital ads with direct response (Google + social, measured on cost-per-customer)
• 20% — Content and social media presence (your time more than money)
• 15% — Retargeting and email marketing to existing contacts
• 15% — Local presence (signage, sponsorships, community)
• 10% — Testing new channels (TikTok, local influencers, direct mail — small bets, measured ruthlessly)

The Rules That Prevent Waste

• Never spend what you can’t measure. Every campaign needs a tracking method — unique phone numbers, promo codes, UTM links, or simply asking “how did you hear about us?” and recording it
• Test small, scale winners. £50 test budgets. Double down on what works (CAC below target), kill what doesn’t within 2–4 weeks. No “brand awareness” spending without a measurement plan
• Fix the bucket before pouring water. If your website doesn’t convert or your Google reviews are 3.2 stars, advertising amplifies the problem. Fix conversion first, advertise second
• Seasonality matters. Spend heavier in your peak seasons, lighter in troughs — but never zero. Going dark means rebuilding momentum
• Review monthly. Marketing isn’t set-and-forget. A 30-minute monthly review of spend vs customers acquired keeps everything honest

Free Marketing Before Paid: The Sequence

Before spending a penny on advertising, exhaust these free channels — they compound over time while ads stop the moment you stop paying:

• Google Business Profile optimisation: Complete profile, 20+ photos, regular posts, systematic review collection. The highest-ROI free marketing in existence for local businesses.
• Referral programme: Formalise word-of-mouth — “£20 credit for every referred customer.” Your happiest customers become your sales team.
• Email list: Collect emails from every customer (with consent) and send a monthly update — offers, news, reminders. Email marketing ROI averages £36 per £1 spent; the list itself costs nothing to build.
• Social media consistency: Not virality — consistency. Three genuine posts a week (behind-the-scenes, customer stories, useful tips) builds an audience that paid ads can’t buy.
• Partnerships: Five active referral partnerships with complementary businesses outperform most ad campaigns.
• Community presence: The unsexy, effective stuff — sponsoring the kids’ team, showing up at events, being known.

Only when these are running should paid advertising enter the picture — and then it amplifies what’s already working rather than compensating for what’s missing. Businesses that advertise before fixing their Google reviews, website and referral systems are paying to send customers to a leaky bucket.

The Bottom Line

Start with 5–10% of revenue if you’re new, 3–5% if established — but let CAC vs CLV override any benchmark. Spend first on what’s measurable and local (Google Business Profile, hyper-local social ads, retargeting), test everything in small amounts, and kill losers fast. The businesses that waste money on advertising aren’t the ones spending too much — they’re the ones spending without measuring. Know your numbers, and the right budget becomes obvious.