Most direct mail money gets wasted not because the mail is bad — but because it lands in front of the wrong people. A blanket drop to 10,000 random households can feel like a serious campaign, but the response rate is usually 1–2% and most of the budget is paying for postage to people who were never going to buy from you.
Targeting flips that. Send fewer letters to the right people, and the same budget delivers far more results. This guide walks through what data is actually available in the UK, five targeting strategies that work, and the mistakes that drain campaign budgets.
Blanket drops vs targeted campaigns
The most common direct mail mistake is treating a postcode area as the unit of targeting. "Send a leaflet to every door in PR8" feels like good coverage. In reality, most of those doors are wasted impressions — wrong demographic, wrong life stage, wrong moment.
Blanket drops typically deliver response rates of 1–2%. You're cheaper per piece (sometimes as low as 20p) but burning most of your budget on people who'll never act.
Targeted campaigns deliver 5–12% response rates because every letter reaches someone who's a plausible fit. You pay more per piece (because the data and personalisation cost something) but the cost-per-response collapses.
What data can you actually use in the UK?
The good news: the UK is one of the world's best countries for publicly available targeting data. None of what's below requires personal data or risks GDPR issues — it's all aggregated to property or postcode level, and most of it is free from official sources.
Property data
Land Registry — every residential sale in England & Wales: who bought, when, for how much. Perfect for spotting recent movers and homeowners coming up to a likely re-mortgage or move.
EPC ratings — energy performance certificates reveal property type, floor area, age, heating type and energy rating. Goldmine for builders, glaziers, heat-pump installers, and insulation companies.
Council tax bands — a reliable proxy for property value and household disposable income.
Business data
Companies House — every UK registered company with SIC sector codes, incorporation dates, accounts filings and director information. Filterable by sector, age, and size.
Business rates — every commercial premises with rateable value (a good size proxy) and use class.
Demographics
Census 2021 — household composition, age profiles, car ownership, employment status, ethnicity, and more, all aggregated to small-area level.
IMD (Index of Multiple Deprivation) — income, health, education, crime and environment scores by area. Useful for skipping mismatched audiences as well as targeting the right ones.
Local intelligence
Planning applications — weekly council data on extensions, conversions, and new builds. Builders, kitchen fitters, and landscapers should be on this every week.
New company registrations — daily Companies House feed of just-registered businesses. Accountants, business banks, IT support, and insurance brokers all benefit.
CQC, schools, and other public registers — find care homes, GPs, nurseries, and primary schools at postcode level.
A note on GDPR: targeting at property or postcode level using public data is fully compliant. You're not holding personal data, you're identifying addresses that match criteria. Royal Mail then delivers an unaddressed (or "Dear Homeowner") letter, or an addressed letter using publicly listed names where appropriate.
5 targeting strategies that actually work
1 Radius targeting
Pick a centre point — your office, a recently won client, a high-footfall postcode — and target every household within X miles. Simple but very effective for local businesses like dental practices, restaurants, gyms, and tradespeople.
2 New mover targeting
Land Registry data shows recent property sales. People who've just moved in need a long list of new local services — dentist, plumber, locksmith, accountant, gardener, even an estate agent for the next move. Hit them within 4–6 weeks of moving and you become the obvious choice.
3 Property-based targeting
EPC data tells you property type, age, size, and energy rating. Perfect for builders targeting older properties (pre-1930), solar installers targeting detached homes with poor EPC ratings, and home-improvement companies looking for properties that need work.
4 Business lifecycle targeting
Companies House publishes every new company registration daily. New businesses are choosing suppliers in their first 90 days — accountants, banks, insurers, IT support, office furniture, payroll. Accountants in particular should be on this feed every week.
5 Cross-source targeting
The real power is combining datasets. For example: "Detached homes, council tax band D or higher, EPC rating D–G, no planning applications in the last 3 years, within 5 miles of my office." That's a tightly-defined list of homeowners who can afford renovations, have energy-inefficient properties, and haven't started any building work yet. A builder mailing this list will see response rates that blanket drops can't get near.
Common targeting mistakes
If a campaign underperforms, it's usually one of these four reasons:
- Going too broad. 5,000 letters to a vague list almost always loses to 500 letters to a sharp one. Resist the temptation to maximise volume.
- Ignoring timing. Mailing accountancy services in July misses the window — decisions get made in October and November as self-assessment looms. Match your timing to your customer's mindset.
- No suppression list. Mailing people who've already responded, opted out, or recently bought from you wastes budget and damages the brand. Always run new campaigns against a suppression list.
- One message for everyone. A landlord and a first-time buyer need very different letters. If you're targeting two audiences, write two letters.
How we do it at LumpyMailPens
We've built a platform with 37 data sources covering every UK postcode. The workflow is deliberately simple:
- You tell us your sector, target area, and budget.
- We find the best-fit households or businesses using cross-source filters — usually returning a list 10–50× more precise than a postcode-level drop.
- We print, pack, and post a personalised letter and branded pen to each address.
- Every letter carries a QR code so you can see exactly which postcodes responded — making the next campaign even sharper.
If you're new to the whole approach, our complete UK guide to lumpy mail covers what it is and why it works. Once you've got the basics, our response-rates breakdown shows the actual numbers you can expect. Or you can plug your own figures into the ROI calculator to see what a campaign would look like in your sector.