Does direct mail still work for builders?

The short answer

Yes, on the published numbers — and the published numbers are not the ones that decide it for you. At the volume a builder actually sends, direct mail is not a percentage game. It is a small, known cost against one job you might not otherwise have got.

What the industry measures

JICMAIL is the body that measures UK mail. Its current release was published in June 2026 and covers 4,939 real mail campaigns run by fifteen organisations over three years — what the advertisers themselves reported, not a survey of the public.

The figures below are its headline averages across every industry that took part.

Cold direct mail — 1% response · £2.10 back per £1

Mail to people who are not already your customers. This is the row a builder writing to planning applicants is in.

Warm direct mail — 6.3% response · £8.80 back per £1

Mail to people who have bought from you before.

Door drops — 0.3% response · £4.00 back per £1

Unaddressed mail through every door in an area.

Partially addressed mail — 0.7% response · £2.30 back per £1

Addressed to a household rather than to a person.

Three things those numbers do not tell you

1. There is no builders' figure. JICMAIL publish eight sectors and construction is not one of them. The nearest is letting or estate agent at 0.3% — a third of the cross-sector average, and its return figure is not published — fewer than ten campaigns in the sample.
2. The return figure rises with volume, and the smallest bracket they publish is enormous. Up to 25,000 items returns £1.60 back per £1; 25,000 to 100,000 returns £2.20 back per £1; 100,000 and over returns £2.70 back per £1. Twenty-five thousand items is two orders of magnitude above what one builder sends in a year.
3. The famous “an A4 letter pulls nearly three times a postcard” line is about mail to existing customers, not to strangers: A4 letter 9.6%, A5 6.6%, Postcard 3.5%, measured on warm retail mail. It is a real finding about the wrong situation, and it gets quoted without the qualifier.

The sum that actually decides it

At 30 letters a month, a 1% response is not “a third of a reply a month”. It is a lottery ticket with a known price, and the price is the only part you can be sure of. So do the sum the other way round.

So the whole year costs £468 and the honest expectation is a handful of enquiries, of which some become work. Which makes the real question this: is one job in a year worth more than £468 to you? If it is, the arithmetic works well below the published benchmark. If it is not, no response rate will rescue it.

Why a planning applicant is not a stranger

The 1% benchmark is for cold mail — people who have shown no sign of wanting anything. Someone who has just applied for planning permission has told the council, in writing and in public, that they intend to build something. They are not a cold name on a list, and the timing is the whole point: the letter arrives while the plan is still being made.

Nobody publishes a response rate for that, including us. It is a reason to expect better than the benchmark, not evidence that you will get it.

Five things that make a difference

• Be quick. A letter that lands the week the decision is published beats the same letter a month later.
• Be local. Name the street. Name the town. Say you have worked two roads away.
• Be specific. Write about the extension they applied for, not about building work in general.
• Be easy to reply to. One phone number, one name, no form.
• Keep going. Anything measured at one in a hundred needs more than one month to say anything at all.