Updated on 9 November 2026 by Nicolas Finet, CEO of Sortlist. This guide has been rewritten for UK advertisers in 2026: it covers how search ads work today, current UK cost benchmarks, Google's AI-driven formats (AI Max), Microsoft Advertising, Quality Score, tracking under UK privacy rules and the ASA rules on price claims.
Search engine advertising (SEA), also called paid search or pay-per-click (PPC), puts your ad in front of people at the moment they search for what you sell. It is the fastest way to get visible on Google, and it is measurable. It is also easy to waste money on. This guide takes you from the basics to the practices that separate efficient campaigns from expensive ones.
Key takeaways
- UK search costs vary by sector: guides for 2026 give an average UK Search CPC of around £1.95 and £1.85-£4.20 for service businesses, and costs have risen sharply over the last decade.
- Google is automating campaign setup: from September 2026, campaigns using campaign-level broad match with automatically created assets are being upgraded to AI Max for Search.
- Results come from the whole system: relevant keywords, strong ad copy, a landing page that matches, accurate conversion tracking and honest claims under the CAP Code.
Section 1. Introduction to search engine advertising
What is search engine advertising?
SEA is a marketing method in which you pay to appear in the sponsored results of search engines such as Google and Bing. You choose the searches you want to appear for (keywords or, increasingly, topics and intents), write the ad and set a budget. In most models you pay only when someone clicks (pay-per-click), and the placement is decided by an auction that considers your bid and the quality of your ad.
SEA and SEO
SEO earns unpaid placements over time; SEA buys placements immediately. Use both: paid search to capture demand now and test messages, SEO to build lasting visibility. See SEO vs SEA and the Google SEO guide.
Why SEA matters
- Intent: people searching are often ready to act.
- Speed: campaigns can start in days.
- Control: you choose budget, location, time and message.
- Measurement: you can track clicks, calls and sales per keyword.
- Testing: paid search shows which messages and offers convert, which informs SEO and other channels.
What do the numbers say?
Costs have risen. WordStream's 2026 benchmarks reported that average cost per click is more than twice what it was ten years earlier, while cost per lead increased by about 13%. In the UK, 2026 guides report an average Search CPC of around £1.95 and a range of £1.85-£4.20 for service businesses. Averages hide huge differences by industry, so compare with your sector and your own margins, not with a headline figure.
Section 2. Search advertising platforms
Google Ads and Microsoft Advertising
| Platform | UK share of search (Sept 2026) | Strengths | Considerations |
|---|---|---|---|
| Google Ads | About 91% across all platforms | Largest audience; many formats (Search, Shopping, YouTube, Maps) | Most competitive; costs are higher |
| Microsoft Advertising (Bing) | About 6% across all platforms; about 18% on desktop | Often lower cost per click; older and desktop-heavy audience; includes Copilot, Edge and partners | Smaller volumes; fewer features |
Share figures are from Statcounter as reported by UK agencies in 2026. Microsoft Advertising was formerly Bing Ads. Some reports say it can be around a third cheaper per click, but that varies by account, so test it with a modest budget, especially for B2B and desktop-heavy audiences.
Ad formats
- Text ads (responsive search ads): you supply several headlines and descriptions and the system assembles combinations.
- Shopping ads: product listings with image, price and store, driven by a product feed.
- Performance Max and AI-driven campaigns: automated campaigns that run across Google channels.
- Dynamic and keywordless matching: ads generated from your site content (see AI Max below).
- Local and call ads: for businesses that want calls and visits.
- Video and demand generation: for earlier-stage audiences.
Targeting options
- Keywords and match types.
- Location (country, region, radius) and language.
- Device, time of day and day of week.
- Audiences: remarketing lists, customer lists, in-market and affinity segments.
- Demographics, where available.
The auction and bidding strategies
Each search triggers an auction. Your position depends on Ad Rank, which combines your bid, the expected quality of your ad and landing page, and the expected impact of ad assets. A high bid with a poor ad can lose to a lower bid with a better ad.
Bidding strategies range from manual cost per click to automated goals:
- Maximise clicks: traffic within budget; suits early testing.
- Maximise conversions / target CPA: aim for leads or sales at a target cost.
- Maximise conversion value / target ROAS: optimise for revenue.
Automated bidding needs accurate conversion data. Feed it poor data and it will optimise for the wrong thing.
Section 3. Setting up your campaign
Create the account and campaigns
- Create a Google Ads account and set up billing, time zone and currency (pounds sterling, with VAT on fees for UK businesses).
- Choose a campaign goal (leads, sales, website traffic, calls, store visits).
- Pick the network and campaign type (Search is the usual start).
- Set location and language, and the daily budget.
- Organise ad groups by theme, so that each ad speaks to its keywords.
- Add conversion tracking before launch (see Section 5).
Keyword research and selection
Build a list from customer language, Search Console data and Keyword Planner. Group by intent. Use broad, phrase and exact match deliberately, and add negative keywords (for example "free", "jobs", "DIY") to prevent wasted clicks. Our guide to the best keyword research tools helps with tools.
Ad copywriting best practices
- Include the keyword theme in the headline.
- State a clear benefit and what makes you different (price, speed, guarantee, location).
- Add a call to action ("Get a free quote today").
- Offer several distinct headlines so that the system can test combinations.
- Be accurate: every claim must be substantiated.
Landing page optimisation
The ad promises, and the page delivers. Match the headline to the ad, load fast on mobile, show the main benefit and one clear action, and keep forms short. Landing page experience feeds into Quality Score, so a better page can lower your costs. See software development in digital marketing for page-speed thresholds.
Budgeting
Work backwards from your goals: how many leads or sales you want, your conversion rate and the maximum you can pay per lead. If your average UK CPC is £2 and 5% of clicks convert, each lead costs about £40 in clicks, so check this against the value of a customer. Start with a budget that allows enough clicks to learn, then scale what works.
Section 4. Advanced optimisation
Ad assets (extensions)
Sitelinks, callouts, structured snippets, call buttons, location and price assets make your ad larger and more useful. They also influence Ad Rank. Keep them current and relevant.
Quality Score
Quality Score is a 1-10 diagnostic based on three factors: expected click-through rate, ad relevance and landing page experience. It is not used directly in the auction, but it indicates where your ads are weak. Google's support documentation describes it as a diagnostic tool to see how ads that show for certain keywords affect the user experience. Improve the weakest factor first.
Ad scheduling
Review performance by hour and day. For a business that takes calls, show ads when someone can answer. Adjust bids or pause at poor-performing times.
Remarketing and audiences
Show tailored ads to people who visited your site, abandoned a basket or are on your customer list. Use consented first-party data, in line with UK data protection rules.
A/B testing
Test one change at a time: headlines, offers, calls to action, landing pages. Run each test long enough to be meaningful and keep what wins.
AI Max and automation
Google is moving advertisers towards more automation. AI Max for Search is an AI-powered layer that adds broad match, keywordless matching, text customisation and final URL expansion to standard Search campaigns while keeping keyword-level control. Google has said campaigns using Automatically Created Assets with campaign-level broad match are being auto-upgraded to AI Max starting in September 2026.
- Check your settings and review the new options before the upgrade reaches your account.
- Monitor search terms and landing pages closely: automation can reach queries and pages you did not intend.
- Use negative keywords, brand exclusions and URL exclusions to keep control.
- Give the system good conversion data, since it learns from what you tell it counts as success.
Section 5. Tracking and measuring success
Set up conversion tracking
Track the actions that matter: purchases, form submissions, calls, bookings. Use Google Ads conversion tracking and, if you use it, Google Analytics 4 events imported into Ads. Where possible, track revenue values. Make sure tracking respects UK rules: advertising and analytics tags generally need consent, and Google Consent Mode should be set up properly. See software development in digital marketing for consent and tagging.
Key metrics
| Metric | What it tells you |
|---|---|
| Impressions and impression share | How often you show, and what share of eligible searches you win |
| Click-through rate (CTR) | How appealing your ad is |
| Cost per click (CPC) | What each visit costs |
| Conversion rate | How well the page and offer turn visits into actions |
| Cost per acquisition (CPA) | The cost of a lead or sale |
| Return on ad spend (ROAS) | Revenue for each pound spent |
Using analytics
Analytics shows what happens after the click: engagement, pages visited, paths to conversion and assisted conversions. See web analytics tools. Link Google Ads and Analytics and compare landing pages.
Optimise on evidence
- Pause or reduce spend on keywords with many clicks and no conversions.
- Increase budget on profitable campaigns, as long as costs per conversion hold.
- Review the search terms report weekly and add negative keywords.
- Check device, location and audience performance.
Section 6. Challenges and considerations
Rising competition and costs
More advertisers and more automation have pushed costs up. Improve Quality Score, target specific intent, use long-tail queries and improve landing page conversion before raising bids.
Ad fatigue and ad blindness
Refresh copy and offers regularly, and test new angles.
Click fraud and invalid traffic
Google filters much invalid traffic automatically and credits some of it. Monitor unusual patterns, exclude suspicious placements and, for large budgets, consider fraud-detection tools.
Policy and legal compliance in the UK
“In the absence of evidence to prove the savings claims within an ad, the ASA is likely to determine that the ad is misleading.”
ASA, Advice on pricing claims (rulings against Hilton Worldwide and Booking.com, November 2025)
- Search ads are covered by the CAP Code. Objective claims such as "cheapest" or "save 30%" must be backed by evidence, and prices must include mandatory fees.
- Complaints often concern hidden costs, exaggerated savings and unclear terms.
- Follow platform policies on trademarks, restricted categories and misleading claims.
- Comparisons with competitors must be fair; see comparative advertising.
Algorithm and platform changes
Platforms change features and defaults often, as with AI Max. Follow official announcements, review account notices and test changes before applying them to all campaigns.
Changing user behaviour
People increasingly use AI answers and conversational queries. Ads can appear alongside AI-generated responses, and match types are changing to follow intent rather than exact words. Write ads and landing pages that answer the real question, and monitor how search terms evolve.
Section 7. Future trends
- Automation and machine learning: more AI in matching, bidding and creative, with advertisers managing inputs and guardrails.
- Voice and conversational search: longer, more natural queries.
- First-party data: consented customer data used for audiences and measurement.
- Privacy-driven measurement: modelled conversions and consent-aware tracking.
- Integration with other channels: search combined with video, shopping and social.
For an overview of channels, see our advertising guide, and if you need support, why hire a digital advertising agency.
Conclusion
Search advertising rewards clarity: a clear goal, relevant keywords, honest copy, a landing page that delivers and accurate measurement. In 2026, more of the work is shifting to automation, so your advantage comes from the quality of your data, your creative and your judgement about what the machine suggests.
Frequently asked questions about search engine advertising
What is search engine advertising?
Paid placements in search results, usually bought on a pay-per-click basis through platforms such as Google Ads and Microsoft Advertising.
How much does Google Ads cost in the UK?
It depends on the sector. 2026 guides report an average UK Search CPC of around £1.95, and £1.85-£4.20 for service businesses, with much higher costs in competitive sectors.
What is AI Max for Search?
An AI-powered layer for Search campaigns that adds broad match, keywordless matching, text customisation and final URL expansion while keeping keyword-level control.
Is Microsoft Advertising worth using in the UK?
It has a smaller share of search than Google but can offer lower costs and a desktop-heavy audience. Test it with a modest budget.
What is Quality Score?
A 1-10 diagnostic based on expected click-through rate, ad relevance and landing page experience.
What rules apply to search ads in the UK?
The CAP Code: claims must be accurate and substantiated, prices must be clear, and comparisons must be fair.
Need help with paid search? Post your project on Sortlist and compare UK PPC agencies for free.
Sources: WordStream, 2026 Google Ads benchmarks, Ridley Digital, UK Google Ads costs 2026, Positionworks, UK benchmark report, Google, AI Max upgrade, Google Ads Help, Quality Score, ASA, pricing claims, Irvale, Microsoft Ads UK. Benchmarks are indicative.
