There are three layers to timing a letter campaign, and they matter in very different amounts. From least important to most: the day of the week, the time of year, and the timing against the owner's own triggers. Most people focus on the first and ignore the third. It should be the other way round.
Layer one: day of the week (minor)
This is the layer everyone asks about and it matters least. A few practical points that do hold:
- Aim for the letter to arrive mid-week. Post that lands Tuesday to Thursday tends to be opened more attentively than Monday post, which competes with a weekend's backlog, or Saturday post, which gets lost in the weekend.
- Account for the postal lag. If you want a mid-week arrival, post accordingly, allowing for first-class delivery times.
- Avoid the days around bank holidays. Post bunches up and your letter competes with more clutter.
Useful at the margin, but do not over-think it. The day of the week will not rescue a poorly targeted campaign.
Layer two: time of year (moderate)
The calendar matters more than the day of the week, but still less than people think.
- Early autumn (September and October) is generally strong. People are back from summer, in a planning frame of mind, and thinking about the year ahead.
- The new year (January) works well. New-year decision-making is real, and owners who spent Christmas thinking about a tired property are receptive.
- Mid-December is weak. Post is buried in Christmas clutter and few people make property decisions in the festive fortnight.
- The run-up to the tax year end can be effective for owners with capital gains decisions to make.
The honest summary: avoid mid-December, lean towards autumn and the new year, but do not let the calendar stop you running campaigns. A good campaign in an average month beats a perfect month with no campaign.
Layer three: timing against the owner's triggers (the one that matters)
This is the layer that actually moves the needle, and almost nobody does it deliberately. The most powerful timing is not a date on the calendar. It is the moment in the owner's own situation.
A letter that arrives a few months before a mortgage refinance, when the owner is starting to worry about the new rate, is dramatically more effective than the identical letter sent at a random time. The same is true for a letter that lands as an EPC certificate approaches expiry, or as a landlord reaches retirement age, or in the window after probate when beneficiaries are deciding what to do.
This is the difference between mass mail and intelligent mail. Mass mail goes out on a calendar schedule. Intelligent mail goes out when the recipient has a reason to read it. The triggers worth timing against are exactly the ones we set out in when are property owners most likely to sell:
- The months around a mortgage refinance date.
- The window before an EPC certificate expires.
- The period as a landlord director reaches their mid sixties.
- The months after a probate grant.
- The point at which financial pressure signals start to appear in company filings.
Why most sourcers cannot do layer three
Timing a letter against an owner's individual triggers requires knowing those triggers, for every owner, and keeping that knowledge current. That is a data problem, not a calendar problem. It means tracking, across thousands of owners, when each one's mortgage renews, when each EPC expires, when each director crosses a key age. Without that data layer, the best a sourcer can do is layers one and two: pick a good month and a mid-week arrival.
With that data layer, the campaign can be timed owner by owner, which is where the real lift in reply rate comes from.
One more timing point: the follow-up
Timing is not only about the first letter. About 30 percent of replies to a well-run campaign arrive 5 to 14 days after the letter lands, and a long tail comes in for weeks after. A single, well-timed follow-up letter, sent 6 to 8 weeks after the first, lifts total response by a further 1 to 2 percentage points. Do not write a campaign off too early, and do not skip the follow-up.
GalimAI is built for layer three. We score every UK property owner against six families of public signal, timing being one of them, and run direct-to-vendor letter campaigns under our client's brand. That means each letter can be timed against the owner's own situation, not just dropped on a calendar date.
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Book a call Request a sample packFAQ
What day should a direct-to-vendor letter arrive?
Mid-week, Tuesday to Thursday, is marginally best. But this is the least important timing factor. Do not let it delay a campaign.
Is there a worst time of year to send?
Mid-December. Post is buried in Christmas clutter and few property decisions are made in the festive period. Autumn and January are the strongest windows.
How important is timing compared with targeting?
Targeting matters most of all, then timing against owner triggers, then the calendar, then the day of the week. A perfectly timed letter to the wrong owner still fails. A well-targeted letter at a decent time succeeds.