Can a signup survey add subscribers to a second newsletter?

Yes, and it's one of the cheapest growth moves I have. Almost all of my growth is paid, so anything that turns one paid signup into two subscribers matters.

In the Las Vegas area I run two newsletters, one on each side of town. The signup survey for one has a single question: do you want us to also add you to our other one across town? Every yes gets pushed to the second newsletter's list in the email platform. No extra form.

"If they say yes, we push their email to the other newsletter as well. So now we just got two subscribers for the neighboring newsletter."

Why ask in the survey and not in a pop-up or on the landing page?

Because I tested it, and the pop-up was expensive. Beehiiv and SparkLoop both offer a pop-up that asks new subscribers if they also want your other newsletter. I used that for a while. Then I moved the offer into the survey as a yes-or-no card at the end.

Setup	Survey fill-out rate
Pop-up offering the sister newsletter first	About 35-40%
Straight to the survey, sister offer as the last question	About 70%

That pop-up was costing me 25 to 30 points of survey completion. In another check, the brand with the pop-up sat around 50% over seven days while my other brands were at 69 to 77%. Two days after we killed the pop-up and added the question at the end, right after the business owner question, the fill-out rate had jumped about 20% in a day.

My read: when the first thing people see after subscribing is an ask for a different newsletter, a lot of them think there's nothing interesting here and leave. They never even see the survey.

The same logic applies to the landing page. A newsletter picker, even with one box pre-checked, is a decision, and people faced with decisions often do nothing. Get the email first. Offer the second list later, when they're already saying yes to things.

How many people say yes?

Enough to be worth it, though it depends on how close the two areas are.

• Inside the survey: I'd say 15 to 20% say yes, though I still need to look closer at the number. That's about two of every ten subscribers joining the second list for free.
• The old Beehiiv pop-up: roughly 10% clicked to add the other brand. In one look at my last dozen subscribers, two came in that way.
• B2B to local: when someone subscribes to my Grind business newsletter, they get offered the local newsletters covering the same area, and about half do it.

For two suburbs that really blur together, my guess is it could go much higher. In big metros nobody knows which suburb they're in. It's a random line. I've said 80 to 90% might say yes for two adjacent small suburbs, but that's a guess, not a number I've measured.

On my podcast, Nick from Oakville Digest told me his two newsletters already overlap by about 10 to 15% without any cross-promotion. The offer just makes that overlap happen on purpose.

Does it change how I spend ad money?

It did for me. At one point I wasn't running ads to my local newsletters at all in one area. I was only running ads to the Grind newsletter, which covers the same area, and letting the post-signup offer fill the local lists. One ad dollar, subscribers on multiple brands.

If you're launching a local and a B2B version, my advice is to do both at the same time and promote people to each other.

Can you pre-build a list for a newsletter that doesn't exist yet?

Yes. Add a question like this to your existing survey:

We're getting ready to launch a new newsletter for [area or topic].
Would you like us to add you to that one too?  Yes / No

You're starting that list now. You don't even need the new newsletter's email platform set up. Store the emails in the survey tool and bulk upload them once it's ready.

Your existing newsletter is the other launch tool. When my B2B newsletter launches, the plan is to promote it at the top of my local newsletters, which reach about 26,000 people, multiple times. Because the survey already told us who the business owners are, we can target them directly.

Should I build the big newsletter first and spin off niches later?

That's what I told a friend who wanted a newsletter for martial arts families. Start the broad community newsletter first. It's easier to start. Once it has 20,000 people in it, launch the niche one and post about it in the main newsletter. You'll get a thousand, two thousand, maybe five thousand people just from that, instead of buying every one of them cold.

You don't always need a second weekly newsletter either. If you want to reach local entrepreneurs, ask in the survey whether they own a business. Put the yeses on a separate list and email them only about things for them: come on my podcast, we're doing a meetup Thursday. It adds a layer of work, but it keeps the main newsletter general.

What else can the same question do?

• A daily digest option for readers who want more.
• A sister brand in a neighboring city. The card can say something like "if you spend any time over there, you might want this one too."
• A niche spin-off. If your survey collects zip codes, you can later launch regional editions with a list already in hand.

One bonus I didn't expect: the cross-sell card fixed an awkward moment in my flow. People who had just given me their email were going straight to a page about deals, with nothing acknowledging they'd subscribed. A "thanks for subscribing, want the other one too?" card solved that.

Newsrooms can use it too. When I worked through a signup survey with one newsroom, a second-newsletter referral made the final cut alongside events interest and a donation ask, because it's a question they'd actually act on.

Any risks?

Watch completion. Every new element in the flow is a risk until proven otherwise. When we added a neighboring-city pop-up, I noticed a subscriber skip the survey and immediately wondered if the pop-up caused it. It turned out the pop-up really was hurting us. Log the change and compare completion before and after.

Also track the yeses the same way in every version. When I moved the offer from the pop-up into the survey, I wanted the "sent to sister newsletter" count fixed so I could compare them honestly.

This only works if you have something to offer: two newsletters covering nearby areas, or a local plus a bigger regional or business brand. More on the flow in where to send new subscribers.