Every real estate vendor pitches you 'leads.' Almost none of them measure cost-per-closed-deal. They measure cost-per-inquiry — which is meaningless if 95% of inquiries never convert. We worked with 14 agents over a 9-month tracking window, attributed every closed deal back to its origin lead source, and calculated the real cost-per-closing. Here's what we found.
How we measured
Each agent recorded the lead source for every transaction that closed between Jul 2025 and Mar 2026. We summed all paid spend by source (ad costs, platform subscriptions, mailing campaigns, sphere maintenance like client appreciation events) and divided by closed deals attributable to that source. Total dataset: 327 closed transactions across 14 agents.
1. Sphere of Influence — Cheapest, Hardest to Scale
If you're not maxing this first, every other lead source is overpriced. Sphere converts at ~28% (if they call you, you usually close). The cap: most agents have ~150-300 viable sphere contacts before referrals plateau. Strategy: tools that help you stay top-of-mind without being annoying.
BombBomb
- +Video email — agents who use it report 4x reply rates
- +Templates for birthdays, transaction anniversaries, market updates
- +Mobile app makes recording in-car easy
- −Doesn't replace text — best as a supplement
- −The 'video me reply' culture takes 3 months to build with your sphere
2. Geo-Farming (Postcards + Door Hangers) — $1,400 per closing
If you're working a specific neighborhood, geo-farming with consistent postcards (every 6 weeks for 18+ months) actually still works. Most agents quit at month 9 — the data shows month 12-18 is when conversion explodes. The math only works if you commit to the long arc.
3. Facebook Lead Ads — $3,400 per closing
Real Geeks Ads + IDX
- +Done-for-you ad templates that actually convert
- +IDX site catches the click-throughs that don't convert immediately
- +Drip nurture is built-in — leads stay warm for 6+ months
- −Lead quality is mixed — expect 30% of inquiries to be tire-kickers
- −ROI requires 6+ months of consistent spend to compound
- −Cost-per-lead climbs in Q4 as competing agents bid up
4. Zillow Premier Agent — $2,800 per closing
Better than its reputation, but still expensive. The trick is the routing: in markets where Zillow uses zip-code routing (vs. flex routing), Premier Agent ROI is meaningfully better. In flex markets, you're competing with 10 other agents for every lead and conversion drops 40%.
5. Realtor.com Connections Plus — $3,900 per closing
Solid in some markets, weak in others. Where it works: secondary markets where Zillow's footprint is lighter. Where it fails: top-50 metros where every agent already has a Realtor.com pipeline. Test it 90 days before you commit longer.
6. Google Local Service Ads — $1,800 per closing
Underrated. Google's Local Service Ads (the ones with the green checkmark in search results) take buyer-intent traffic and route it directly. ROI better than Facebook in our test, but volume is lower (~6-12 leads/mo for typical agent). Best for agents who want a slow, steady stream — not feast-or-famine.
What we'd skip in 2026
- OpCity / ReadyConnect (Realtor.com's referral arm) — referral fees of 30-35% destroy the margin
- Buying lead lists from anyone offering 'exclusive' leads at <$5 each — they're never exclusive
- Most 'AI lead-gen' tools that promise to find off-market sellers — none we tested produced reliable results
- Generic SEO 'lead-gen blogs' — possible to do well, but 18+ months to first lead
The honest stack we'd build for $1,500/mo
- $0 — Sphere maintenance (handwritten cards, anniversary check-ins)
- $33/mo — BombBomb for video email
- $200/mo — geo-farm postcards (commit 18 months)
- $300/mo — Facebook Lead Ads via Real Geeks (build the long-tail pipeline)
- $500/mo — Google Local Service Ads (steady high-intent leads)
- $200/mo — Zillow Premier Agent in your zip-routed market only
- $200/mo — Follow Up Boss + drip nurture (where the leads live)
$1,433/mo total. At measured cost-per-closing across these channels, this should produce 15-25 closed deals/year for a working solo agent who answers their phone. At a $375k average sale and 2.5% commission, that's $140-235k GCI.