How to Automate Your Apartment Buzzer (DIY vs. the Easy Way)
Five ways to automate your apartment intercom — from Twilio scripts to hardware hacks to consumer apps. Here's what each approach costs, what it requires, and which one actually works for non-engineers.
Quick answer
You can automate an apartment buzzer five ways: write a Twilio script, attach a SwitchBot to a wall handset, use Google Voice forwarding, set a DTMF tone as your voicemail greeting (hack, not recommended), or use a consumer app like BuzzBot. For deliveries-without-effort, the only approach that actually auto-buzzes verified packages is a consumer app with email integration.
Your apartment intercom is a phone call. When someone buzzes your unit, the intercom dials a phone number and waits for someone to answer and press 9. That simplicity is why it's automatable — anything that can answer a call and send a DTMF tone can open the door.
There are at least five ways to do it. Some require code. Some require hardware. One requires nothing but an iPhone and two minutes. Here's the short tour.
Approach 1: Build it yourself with Twilio
Twilio Programmable Voice lets you write a webhook server that answers incoming calls and responds with TwiML instructions — including playing audio and sending DTMF tones. You buy a Twilio number (~$1.15/month), give that number to your building, and write a script that auto-answers and sends "9."
The basic version is surprisingly simple: a single webhook endpoint that returns TwiML to play a tone. But the basic version also auto-buzzes everyone — delivery drivers, salespeople, strangers. Adding intelligence (checking who's calling, verifying deliveries, forwarding unknowns) turns a weekend project into ongoing infrastructure you have to maintain.
What it costs
- Twilio number: ~$1.15/month
- Per-call charges: ~$0.013/minute
- Hosting for your webhook server: $5-20/month (Render, Railway, or a VPS)
- Your time to build and maintain it
Limitations
- Requires programming knowledge (Node.js, Python, or similar)
- No iPhone app — you monitor via logs or build your own dashboard
- No Gmail integration unless you build it (OAuth setup, email parsing, carrier detection)
- If your server goes down, your buzzer stops working
- No push notifications for manual approval
Approach 2: Hardware hacks (SwitchBot, Shelly relay)
If your apartment has a wall-mounted intercom handset with a physical buzzer button, you can attach a SwitchBot (a small Bluetooth-controlled arm that physically presses buttons) or wire a Shelly relay into the buzzer circuit. When you want to let someone in, you trigger the device from your phone.
Limitations
- Only works with in-unit handsets that have a physical button — not phone-based intercoms
- SwitchBot requires Bluetooth range (or a hub for remote access)
- Shelly relay requires basic electrical wiring knowledge
- Neither one answers the intercom call — you still have to pick up first
- No intelligence: no delivery detection, no voice verification, no logging
Approach 3: Google Voice forwarding
Google Voice gives you a free virtual number that forwards calls to your real phone. You give the Google Voice number to your building and answer intercom calls on your cell. It's not automation — it's call forwarding with a different number. You still answer, you still press 9, you still miss deliveries when your phone is on silent.
Google Voice also has a known DTMF reliability issue: its call screening feature can interfere with tone delivery, sometimes preventing the door from opening even when you press the right key.
Approach 4: The voicemail DTMF trick
A clever hack that circulates on Reddit and Hacker News: set your voicemail greeting to a recording of a DTMF "9" tone. When the intercom calls and nobody answers, it hits voicemail, the greeting plays the tone, and the door opens.
Why it doesn't really work
- Most carriers compress voicemail audio, distorting the DTMF tone
- It buzzes in everyone — no verification at all
- It only works if nobody answers the call (if you answer, the voicemail trick doesn't trigger)
- Some intercoms hang up before voicemail picks up
- Your voicemail greeting is now a buzzer tone, which confuses anyone else who calls you
Approach 5: Consumer buzzer apps
Several apps now exist specifically for apartment intercom automation. They handle the phone number, the call answering, and the DTMF tone — no coding or hardware required.
Most of these apps (FreshBuzzer, Ringo, Lowkey) focus on call forwarding and PIN-based access codes. They answer the intercom call and prompt the visitor to enter a code. If the code matches, the door opens. If not, the call forwards to your phone.
BuzzBot takes a different approach: instead of codes, it checks your Gmail for shipping confirmations and verifies callers by voice. If a UPS driver buzzes and BuzzBot finds a UPS delivery confirmation in your inbox, it asks for a name on the package and buzzes them in. No code to remember, no manual approval needed.
Comparison: all five approaches
- Twilio DIY: Full control, requires code, ~$7-22/month, no delivery detection unless you build it
- Hardware (SwitchBot/Shelly): Works with in-unit handsets only, doesn't answer calls, no intelligence
- Google Voice: Free, but just forwarding — not automation. DTMF reliability issues
- Voicemail trick: Clever but unreliable. Buzzes everyone. Breaks your voicemail
- BuzzBot: $3.99/month, no code, Gmail delivery detection, voice verification, push notifications. iPhone only.
| Approach | Setup | Cost / month | Auto-buzzes deliveries | Requires code |
|---|---|---|---|---|
| Twilio DIY | High | ~$7–22 | Only if you build it | Yes |
| SwitchBot / Shelly relay | Medium | $0 after HW | No | No |
| Google Voice | Low | $0 | No (forwards only) | No |
| Voicemail DTMF trick | Low | $0 | Buzzes everyone | No |
| BuzzBot | Low (2 min) | $3.99 | Yes (Gmail-verified) | No |
Which approach is right for you?
If you're a developer who enjoys building and maintaining infrastructure, the Twilio DIY route gives you maximum control. If you have a wall-mounted handset and want remote button pressing, SwitchBot is simple. If you just want a different number on file, Google Voice is free.
If you want deliveries to get buzzed in automatically without your involvement, and you don't want to maintain a server or write code, BuzzBot is the only option that handles the full verification flow out of the box.
Common questions
Can I automate my apartment buzzer without my landlord knowing?
Yes. Giving the building a virtual number instead of your cell is indistinguishable from any other number change from management’s perspective. You aren’t changing the intercom hardware or the building’s system — you’re changing what number rings at the other end of the call.
What is the cheapest way to automate an apartment buzzer?
A Google Voice forwarding number costs nothing and keeps your cell private, but it doesn’t actually automate the intercom — you still press 9 yourself. For real automation (the call answered without you), the cheapest consumer app is around $3/month.
Can I use Twilio to build my own apartment buzzer automation?
Yes, if you’re a developer. A basic "answer and always press 9" script is maybe a weekend of work. Adding the real features — Gmail delivery verification, voice matching, push notifications, fallback forwarding — turns it into a small product you have to maintain indefinitely.
Do I need any hardware to automate my apartment intercom?
No, as long as your intercom is phone-based (which covers nearly all modern apartment buildings). All the automation happens at the phone layer — nothing changes in the building’s intercom, the wiring, or the door hardware.
The easy way
BuzzBot automates your apartment buzzer in under 2 minutes. No code, no hardware, no server to maintain. Your intercom calls go to BuzzBot's servers, not your phone — and expected deliveries get buzzed in automatically via Gmail detection. Try it for $1.99.
Automate your apartment intercom
Get a local phone number and set everything up in under 2 minutes. Try it for $1.99.