How to Write a 30-Second Radio Commercial That Actually Works

By Jeff | JeffCVO.com | Inside the VO Studio

Thirty seconds. That's all you've got.

Thirty seconds to grab someone's attention, tell them about your business, give them a reason to care, and hopefully get them to take action.

Sounds easy, right?

Well, after more than 30 years working in radio and professional voice-over, I can tell you there's a big difference between a radio commercial that simply fills 30 seconds and one that actually gets your message across.

I've heard commercials that were funny, clever, memorable, and incredibly effective. I remember as a kid, I couldn't get away from "588-2-300 EMPIRE!" or later on in life, "Ba da ba ba ba, I'm Lovin' It".

I've also heard plenty that tried to cram 60 seconds of information into a 30-second spot.

Trust me, nobody wins that race.

So, whether you're a business owner writing your first radio advertisement or a marketing professional looking to improve your next campaign, here are a few things I've learned about writing a 30 second radio commercial script that actually works.

1. Grab Their Attention Immediately

Here's something to remember about radio: people are usually doing something else while they're listening.

They're driving, working, making dinner, or trying to figure out why the check engine light just came on.

Your commercial has to interrupt their thoughts without annoying them.

And you've got about three to five seconds to make that happen.

Start with something interesting. Ask a question, introduce a problem, make a surprising statement, or use a little humor.

For example, instead of opening with:

"Since 1985, Smith Heating and Cooling has proudly served the community..."

Try this:

"Is your air conditioner working harder than your teenager?"

See the difference?

One sounds like a company brochure. The other gives listeners a reason to pay attention.

Your opening line should make people want to hear what comes next.

2. Keep Your Radio Commercial Script Short and Simple

One of the biggest mistakes in radio ad script writing is trying to say too much.

A typical 30-second radio commercial contains approximately 65 to 75 spoken words, depending on the delivery, pauses, music, and sound effects.

Could a professional voice actor squeeze in more? Absolutely.

Should we? Not necessarily.

Just because I can read something at auctioneer speed doesn't mean your customers want to hear it that way.

Remember, listeners don't have the luxury of going back and rereading your message.

Keep your sentences short. Use everyday language. And most importantly, focus on one main idea.

If your business has 15 different services, you probably don't need to mention all 15 in one commercial.

Pick the most important one and build your message around it.

3. Sell the Benefit, Not Just the Product

Here's a little advertising secret.

Most people aren't nearly as interested in what your product does as they are in what it can do for them.

Let's say you're advertising a mattress store.

You could say:

"We offer premium mattresses featuring advanced memory foam technology."

Or you could say:

"Tired of waking up feeling like you wrestled a bear all night? It might be time for a better mattress."

Both statements talk about mattresses.

But the second one connects with something the listener actually experiences.

When writing your radio commercial, ask yourself one simple question:

Why should the listener care?

If your script answers that question clearly, you're already ahead of the game.

4. Write for the Ear, Not the Eye

This is something I wish more advertisers understood.

A sentence that looks fantastic on paper doesn't always sound good when someone reads it out loud.

Radio is a conversation.

Your commercial should sound like you're talking to one person, not delivering a speech to a room full of corporate executives.

Avoid complicated phrases, industry jargon, and sentences that seem to go on forever.

Here's a simple trick I recommend.

Read your script out loud.

Not in your head. Actually read it.

If you stumble over a sentence, chances are your voice-over artist might stumble over it, too.

And if something sounds unnatural, rewrite it.

The best commercial voice over performances start with scripts that sound like something a real person would actually say.

5. Give Listeners One Clear Call to Action

You've grabbed their attention. You've explained the benefit. Now what?

Tell them what to do next.

Do you want them to visit your website? Stop by your store? Call for an appointment?

Pick one primary action and make it easy to remember.

For example:

"Schedule your free estimate today at SmithHeating.com."

That's simple, direct, and easy to understand.

What you don't want is something like:

"Call us, visit our website, follow us on Facebook, check out Instagram, download our app, and stop by one of our six convenient locations."

Whoa! Easy there.

You've got 30 seconds, not an entire afternoon.

One clear call to action is usually more effective than a laundry list of instructions.

6. Don't Forget the Power of the Right Voice

Now we're getting into my favorite part.

You can write a terrific radio commercial, but if the delivery doesn't match the message, something gets lost.

Imagine a warm, heartfelt commercial about a family-owned business being delivered by someone who sounds like they're announcing a monster truck rally.

Probably not the emotional connection you were hoping for.

On the flip side, an exciting weekend sales event probably shouldn't sound like a bedtime story.

The right voice brings your script to life.

A professional voice-over artist understands pacing, emphasis, tone, and how to make a message sound natural rather than simply reading words from a page.

Sometimes the difference between a good commercial and a great one is a slight pause, a subtle smile in the delivery, or emphasizing just the right word.

Those little things matter.

And after three decades behind the microphone, I've learned that knowing how to say something is just as important as knowing what to say.

7. Here's an Example of an Effective 30-Second Radio Commercial

Let's put everything together.

Here's a sample 30 second radio commercial script for a fictional heating and cooling company.

CLIENT: Smith Heating & Cooling

STYLE: Friendly, conversational, slightly humorous

SCRIPT:

"Is your air conditioner working harder than your teenager? Maybe it's time to give it a break! At Smith Heating and Cooling, we'll keep your home comfortable without making your wallet sweat. From quick repairs to complete system replacements, our friendly team has you covered. Schedule your appointment today at SmithHeating.com. Smith Heating and Cooling. Keeping you cool when things heat up!"

Why this script works:

It opens with humor, identifies a familiar problem, offers a solution, and ends with a clear call to action.

It also leaves room for a natural, conversational delivery instead of forcing the announcer to race through every word.

That's the kind of script I enjoy bringing to life.

8. Always Time Your Commercial Before Recording

Here's one final piece of advice.

Never assume your commercial is 30 seconds just because the word count looks right.

Read it out loud with a stopwatch.

Better yet, have someone else read it.

Allow time for natural pauses, sound effects, music transitions, and any required disclaimers.

If your script clocks in at 34 seconds, don't automatically tell the voice actor to read faster.

Look for words you can eliminate.

A commercial that breathes naturally will generally sound better than one that feels like the announcer is trying to catch the last train out of town.

The Bottom Line: Make Every Second Count

Writing a successful 30-second radio commercial isn't about squeezing in as much information as possible.

It's about making the most of the time you have.

Grab attention. Keep it simple. Focus on benefits. Sound conversational. And give listeners a reason to act.

Most importantly, remember that your commercial is speaking to real people.

Not demographics. Not spreadsheets. People.

And people respond to messages that sound genuine.

After more than 30 years in radio and professional voice-over, that's one lesson that hasn't changed.

Need a Professional Voice for Your Next Radio Commercial?

That's where I come in.

I'm Jeff, the voice behind JeffCVO, and I've spent more than three decades helping bring words to life through professional voice-over.

Whether you need a friendly, conversational delivery, a confident and authoritative sound, or something with a little more energy and personality, I'd love to help make your next project sound its best.

Listen to my professional voice-over demos or visit JeffCVO.com to get in touch for a custom quote.

Because a great commercial deserves a great voice.

And remember... your message sounds better here.

— Jeff | JeffCVO.com

Frequently Asked Questions About 30-Second Radio Commercials

How many words should a 30-second radio commercial have?

Most 30-second radio commercials contain approximately 65–75 spoken words. The ideal count depends on the announcer's delivery, pauses, sound effects, and music.

What should a 30-second radio commercial include?

An effective commercial typically includes an attention-grabbing opening, a clear customer benefit, the business name, and a simple call to action.

How do you make a radio commercial memorable?

Focus on one strong message, use natural conversational language, and consider humor, emotion, or a distinctive sound when appropriate.

Do I need a professional voice-over artist for my radio commercial?

Not every advertisement requires professional talent, but an experienced voice-over artist can help communicate your message clearly, establish the right tone, and give your commercial a polished sound.