When your interior design firm adds team members, personal phone numbers no longer work. Here’s what designers use for shared business lines and communication systems.
Your cell phone number worked fine when it was just you. You answered every call, returned every text, and never worried about a lead going to voicemail because there was no one else to pick it up anyway.
Then your firm started to grow. You brought on another designer. Maybe two. And suddenly, your personal cell number is still the one on your website, on your business cards, on every inquiry form you have ever built. Every new prospective client call is still routed directly to you, even when you are in the middle of an install.
The communication infrastructure that worked for a solo practice does not automatically scale. At some point, the question shifts from “how do I answer my phone” to “how does my firm answer the phone.” That shift requires a real decision about systems, not just habits.
Why This Moment Is About More Than a Phone Number
The question of what number to put on a business card is not really about phone numbers. It is a question about how your business presents itself to new clients, how leads get captured and routed when you are unavailable, and how you protect your team members’ personal boundaries as you add staff.
When a prospective client calls a number that belongs to a designer who is on leave, on site, or no longer with the firm, you have a problem. When a new team member gives out their personal cell because there is no alternative, you are putting your business relationships in their pocket, not yours. And when every inquiry comes through the principal’s personal line, the firm’s growth is capped by that one person’s availability.
The designers in the Interior Design Community who have solved this problem have landed on a few different approaches, depending on their size, their budget, and what else they need the system to do.
What the Community Is Actually Using
The solutions designers are running fall into three general categories: lightweight virtual phone tools, multi-line VoIP systems, and all-in-one CRM platforms that include phone and messaging. Each has a different cost structure, level of complexity, and return, depending on how much of your lead management you want the tool to handle.
The Lightweight Option: Google Voice
Google Voice is the most commonly mentioned solution among designers in the early growth stage. It gives you a separate business number that forwards to one or more cell phones, costs very little, and requires no hardware.
“We have a Google voice number that forwards to principal designer and studio director cell phone. It’s not a perfect solution – as you can’t see the caller id – but it is affordable and flexible. When on vacation, you can change the forwarded number temporarily, if someone else is fielding calls.”
@indigomavens
The tradeoff is real: caller ID visibility is limited, and the system works best when only one or two people need to be on it. For firms just adding their first additional designer, this is often a reasonable starting point. The vacation forwarding feature alone solves a genuine operational problem. Coverage becomes a forward change, not a phone hand-off.
One designer pairs Google Voice with a dedicated CRM and lead management platform for a more complete setup:
“Google voice is great for this. Also take a look at Go High Level if you are looking for a robust CRM and lead management system. You can also get your phone numbers through them if the product makes sense for your growth strategies.”
@chadofall_chadillac
Go High Level is a more complex tool built for agencies and service businesses. If your firm is at a stage where you also want to automate follow-up, manage your pipeline, and track leads from first contact through signed contract, it is worth evaluating. If you just need a shared number, it is more than you need right now.
The Mid-Tier Option: VoIP Systems With Multiple Lines
For firms with three or more team members, or firms where each designer needs their own line with outgoing calls that display the business number, a VoIP phone system becomes more practical.
“We have a digital phone number that has multiple lines for everyone. I gave my work at home staff the option of having a desktop phone on the system or ringing to their cell phone. They all opted for the cell phone method. But this app shows outgoing calls from the business number, so no one ever has their personal number. You’re welcome to DM me and I can share who we use!”
@kristinacrestindesign
Outgoing caller ID is the key feature that Google Voice does not handle well at scale. When your designer calls a vendor, a contractor, or a prospective client, the business number shows up, not their personal cell. That matters for privacy, professional presentation, and the practical reason that clients should call back a number the firm controls.
Zoom Phone is another platform in this category:
“Zoom phone system…you can text photos and group text from the zoom app on your work number but it’s just an app on their phones. Everyone gets a $50 phone reimbursement each month”
@katebhaywood
The $50 per-person monthly phone reimbursement is worth noting as a business practice. If you are asking team members to use their personal devices for business calls, even through an app that masks their personal number, a reimbursement policy is both reasonable and professionally standard. It also sets a clear precedent that the business is absorbing the operational costs of doing business, rather than quietly passing them on to employees.
The Integrated Option: All-in-One Business Communication Platforms
For firms that want phone, text, email, and client communication managed in a single system with visibility across the team, an integrated platform changes how the whole operation functions.
“We use @mysidemark for our phones, texts, emails, and CRM (and so much more). It’s so nice for both of us to be able to see and respond to each other’s messages when needed, too. The private in-app team notes that you can add to different conversations are also super handy!”
@poisedandplumb
Sidemark is a platform built specifically for interior designers. The in-app team notes feature is particularly practical: when a prospective client texts the business number, one designer can see the conversation and flag it for another with context, nothing falls through the cracks. The alternative is to forward screenshots, copy text threads, and try to reconstruct who said what to whom and when. That kind of operational friction compounds as a firm grows.
For firms at the scale where communication visibility across the team matters more than simply separating business and personal lines, this category is worth evaluating.
What Actually Goes on the Business Card
Once you have chosen a phone system, the business card question answers itself. Every team member lists the business number, not a personal cell. Each designer may have their own extension or line within the system, but the number a prospective client receives is a number the business controls.
Three specific scenarios make this matter more than it might initially seem.
When a designer leaves the firm, their business contact information stays with the firm. The prospective client who has that number can still reach you. If they had a personal cell number instead, that relationship walks out the door with the designer.
When a designer is on leave or unavailable, calls and texts can be forwarded or monitored without requiring access to a personal phone. Coverage becomes a system function, not a personal favor.
When the business grows further, and you add an office manager or a dedicated intake role, all leads are already routing through infrastructure that person can manage, not a phone sitting in someone’s pocket.
The Email Side of the Same Decision
The phone and email questions usually arrive together, and the same logic applies. A business email address that lives in your firm’s domain (firstname@yourstudioname.com) is a business asset. An email that routes through a personal Gmail or that is not documented in your firm’s systems creates the same transition risk as a personal phone number.
If you are using Google Workspace for email, adding team members with domain-based addresses is straightforward and inexpensive. If you are using an integrated platform like Sidemark, email may already be part of the system. Either way, the principle is the same: business communications belong in business infrastructure.
Set up the email addresses at the same time you set up the phone system. These are the same decisions made together.
A Practical Sequence for Making the Switch
If your firm is at the stage described in this question (solo-founded, now adding designers, and needing to professionalize the communication setup), here is a reasonable sequence.
Pick your tier based on where the firm actually is. If you have one additional designer and a tight budget, Google Voice with shared forwarding is a reasonable starting point. If you have three or more team members and an outgoing call identity matters to you, consider VoIP platforms. If you want integrated communication management and your operations are ready for it, evaluate purpose-built tools that combine phone, text, email, and CRM into a single platform.
Get the system running before you print anything. The number on the card needs to work before it goes out to a single client or prospective lead.
Build a phone reimbursement policy into your employment or contractor agreements if you are asking team members to use personal devices. It does not need to be large. It just needs to be written down.
The Bigger Shift Behind the Business Card Question
The original question frames this as a business card problem. What it actually is: the moment a solo-founded design practice stops running on the founder’s personal infrastructure and starts running on the firm’s.
That shift is not just about phones and email addresses. It is about building a business that can operate, represent itself, and serve clients whether or not the founding designer is personally available at that moment. The communication layer is often where that shift first becomes visible, and where getting it right determines whether growth actually holds.
The designers in the Interior Design Community are using everything from Google Voice to full CRM-integrated platforms. The right answer depends on your size, your budget, and how much you want the system to do beyond just ringing. But every designer who has been through this transition tends to say the same thing: they wish they had set it up sooner.
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