Your database is packed with past vendors, buyers, and appraisal leads — plus people who clicked, enquired, or transacted years ago. Most agents are only speaking to a fraction of them.
That’s a sphere of influence (often shortened to SOI). In real estate, sphere of influence means the network of people who already have a relationship with an agent or a brokerage: past clients, referral partners, and everyone in between.
Worked well, a real estate sphere of influence is the single biggest revenue lever most firms already own and mostly ignore.
Here’s the problem at the brokerage level. Each of your agents has their own version of this database. Some are working it. Most aren’t. And as a broker, you have almost no visibility into which is which, until a competitor closes a deal with a client your agent sold a house to five years ago.
The numbers back this up. The National Association of REALTORS®’ 2026 Member Profile found the typical REALTOR® earned 28% of their business from repeat clients and another 22% from past-client referrals in 2025, up sharply from 20% and 21% the year before. At the firm level, NAR’s 2025 Profile of Real Estate Firms found that brokerages typically generated 46% of sales volume from repeat business and 44% from past-client referrals.
The overwhelming majority of your firm’s revenue is coming from people agents have already met. This guide covers what sphere of influence in real estate actually means, why it matters more at the brokerage level than most people admit, and how to build a system that works your agents’ spheres without exposing your firm to compliance risk.
Read on for a practical, consent-first guide to building and working a real estate sphere of influence.
Jump to What You Need:
- What Is a Sphere of Influence in Real Estate?
- Why Your Sphere of Influence Matters to a Brokerage
- Who Actually Belongs in a Real Estate Sphere of Influence?
- How to Build an SOI System That Works Across a Whole Brokerage
- SOI Scripts Your Agents Can Actually Send
- Why Manual SOI Systems Break Down at Scale
- FAQs on Sphere of Influence in Real Estate
What Is a Sphere of Influence in Real Estate?
SOI stands for sphere of influence. The SOI meaning in real estate is simple: it’s every person an agent can reach because of an existing relationship, not a cold introduction. Past clients. Family. Neighbors. Vendors. Community contacts. Anyone who already knows and trusts the agent.
You’ll see it written as “SOI,” “real estate SOI,” or spelled out in full. Same thing.
It matters because trust doesn’t have to be built from zero. NAR’s 2025 buyer and seller research found 87% of sellers said they’d recommend their agent for future business, and 72% said they’d “definitely” do it. That goodwill is sitting in your CRM right now, unused, for most of your roster.
Why Your Sphere of Influence Matters To A Brokerage
Individual agents forget to follow up. That’s not news. What should worry you as a broker is what that adds up to across 50, 200, or 2,000 agents.
Every agent who lets their sphere go cold is walking away from business your firm already paid to acquire, through the original transaction, the marketing spend, the lead cost. And you have no consistent way to see it happening.
Here’s what a neglected sphere costs you:
- Repeat business you never see. NAR’s home buyer and seller research shows sellers now stay in a home for a median of 11 years before selling again. That’s not a reason to wait 11 years to talk to them. It’s a reason your firm needs a system that stays useful in the gap, so the eventual sale doesn’t go to whichever agent happened to still be in touch.
- Referrals that go to a competitor. A happy client will introduce people. But only if someone stayed on their radar long enough to be top of mind when the moment came.
- A widening trust gap. According to Zillow’s 2025 Consumer Housing Trends Report for Agents, 79% of repeat buyers say they’d consider working with the same agent again, but only 13% actually do. That’s not a loyalty problem. That’s a follow-up problem, and it’s costing your firm real transactions, at scale, every year.
None of this shows up on a P&L line labeled “lost repeat business.” It just shows up as flat production and higher acquisition costs, quarter after quarter.
Who Actually Belongs in a Real Estate Sphere of Influence?
Not everyone in an agent’s phone. A useful SOI is built on genuine relationships, and it should respect how each person actually wants to be contacted. That includes:
- Past buyers and sellers
- Current and former vendors, appraisers, and inspectors
- Personal contacts: family, friends, neighbors
- Local business and community relationships
- Referral partners such as mortgage brokers, attorneys, and contractors
- Anyone who has interacted with the agent or the firm and given some form of consent to be contacted
A purchased list, a scraped phone number, or a stale email address from an old lead form is not a sphere. Across a large roster, inconsistent consent practices aren’t a hundred small risks. They’re one large one, sitting under your firm’s name.
None of this is legal advice, and it shouldn’t replace a conversation with your compliance counsel.
How to Build an SOI System That Works Across a Whole Brokerage
1. Centralize the list
Every agent’s past clients, referral contacts, and community relationships should live in one system your firm can see, not scattered across personal phones and spreadsheets that walk out the door when an agent leaves.
2. Clean it
Deduplicate and cleanse your database. Flag anyone who’s opted out. Identify the contacts with no valid consent record at all, and don’t let automation touch them.
3. Segment by relationship, not just deal size
A simple model, core relationships, active contacts, and light-touch contacts, is easier for agents to actually use than an elaborate scoring system nobody maintains.
4. Give every active contact a next action
“Touch base sometime” isn’t a plan. “Send a home-equity update at the 12-month closing anniversary” is.
5. Provide value outside the transaction
Local market updates, homeowner maintenance information, trusted vendor recommendations. The goal isn’t contact frequency. It’s staying useful.
6. Ask for introductions at the right moment
After a closing, after positive feedback, after solving a problem. Context makes the ask feel earned instead of transactional.
7. Review and prune regularly
An SOI is a living system. People move, opt out, and change preferences. Your data should keep up.
SOI Scripts Your Agents Can Actually Send
Generic mail-merge messages read exactly like what they are, and clients notice. These need to be personalized before they go out, but they’re a starting point.
New listing agent announcement SOI script
“Hi [Name], quick update: I’m now working with [Brokerage]. Same commitment to finding people the right home, just under a new roof. If you or anyone you know is thinking about buying or selling, I’d love to help.”
Post-close check-in SOI script
“Hi [Name], it’s been about [X weeks] since we closed on [Street]. How’s the move-in going? Let me know if anything’s come up, happy to point you to someone if you need it.”
Home anniversary SOI script
“Hi [Name], happy home anniversary! It’s been a year since [Street] became yours. If you’re curious what it might be worth in today’s market, I’m happy to run the numbers, no pressure either way.”
Referral request after positive feedback SOI script
“Hi [Name], really glad the closing went smoothly. If you know anyone else thinking about buying or selling, I’d genuinely appreciate the introduction.”
Reconnection after a gap SOI script
“Hi [Name], it’s been a while since we closed on [Street/Neighborhood]. Hope you’re settling in well. No pressure at all, just wanted to check in. Let me know if there’s ever anything I can help with.”
Here’s Why Manual SOI Systems Break Down at Scale
You can keep hoping your agents remember to follow up. Or you can put a system underneath them that catches what they miss, keeps your consent records defensible, and turns dormant contacts back into pipeline.
Half your firm’s revenue is already coming from people who’ve met you before. The question is whether you’re capturing all of it, or leaving the rest for whoever calls them next.
That’s the gap RISE by MoxiWorks is built to close. RISE is a native-AI relationship engine built for real estate. Instead of relying on each agent to remember who to call, it monitors the whole database, including the contacts nobody’s thought about in months, and surfaces who to reach out to and why. The result: automated, personalized nurture campaigns, so repeat and referral business doesn’t depend on any one agent’s memory or workload that week, and an AI-prioritized contact list with ready-to-send messaging, so the follow-up actually happens.
Agents on the MoxiWorks platform see 3.5x more sold listings on average, and the MoxiWorks network has saved over 10 million hours of manual follow-up work to date.
