The verdict in three sentences
A New York brokerage with 4 to 12 agents can run listings, matching and syndication on a vertical SaaS at 50-120 EUR/user/month, or on custom software at 25,000-55,000 EUR. Custom pays off beyond 6-8 seats, or when matching and workflows become your competitive edge. Below that, a well-configured off-the-shelf tool stays the rational choice: the real cost is not the license, it is re-keying time and lost listings.
Build vs buy: what you actually pay
The question is not "what does the software cost" but "what does my admin time cost". An agent re-entering one listing across 5 portals loses 30-45 minutes per property. On an active book of 80 listings, that is dozens of hours a month.
| Item | Vertical SaaS | Custom (Kolonell) |
|---|---|---|
| Entry cost | 0-1,500 EUR setup | 25,000-55,000 EUR |
| Monthly fee | 50-120 EUR/user | Hosting 80-250 EUR/mo |
| 3-year cost (8 users) | 20,000-38,000 EUR | 30,000-62,000 EUR |
| Workflow customization | Limited | Total |
| Portal export | Standard (Zillow, StreetEasy) | Custom + API |
| Code ownership | No | Yes |
At 8 seats over 3 years, both options converge around 30,000-60,000 EUR. Beyond that, custom becomes structurally cheaper because there is no per-seat license.
Functional scope of an agency platform in 2026
| Module | Content | Effort (person-days) |
|---|---|---|
| Contact CRM | Buyers, owners, scoring | 8-12 |
| Listing book | Mandates, photos, status | 10-15 |
| Automatic matching | Supply/demand pairing | 8-14 |
| Portal syndication | Zillow, StreetEasy, site | 12-18 |
| Mandate management | Exclusive/open, deadlines | 6-10 |
| Management reporting | Pipeline, conversion, revenue | 5-8 |
A typical project combines 5 to 6 modules for 45 to 75 person-days, i.e. the 25,000-55,000 EUR range depending on matching complexity and the number of portals integrated.
Mini case study
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Karim runs a 7-agent brokerage in Midtown Manhattan. Each agent loses about 6 hours per week on multi-portal re-keying and manual follow-ups. At a loaded cost of 28 EUR/hour, that is 7 x 6 x 28 = 1,176 EUR/week, roughly 51,000 EUR/year of non-selling time.
Custom software at 42,000 EUR that eliminates 70 % of that loss saves about 35,700 EUR per year. Payback in 14 months, excluding extra listings won through faster matching and automated follow-ups.
FAQ
How much does portal integration cost? Budget 12 to 18 person-days, i.e. 8,000-14,000 EUR depending on the number of portals (Zillow, StreetEasy, MLS feeds) and the availability of their APIs.
How long to build a custom agency platform? An operational MVP (CRM + listings + syndication) ships in 8 to 12 weeks. The full scope with advanced matching and reporting takes 4 to 6 months.
At how many seats does custom pay off? Beyond 6-8 agents, saving on licenses (50-120 EUR/user/month) offsets the upfront build within 2 to 3 years, with no growth ceiling.
Can we keep our data if we leave the vendor? With custom, yes: you own the code and the database. With SaaS, check the export clause; migrating 80 listings often costs 1,500-3,000 EUR of services.
Is automatic matching worth the cost? A matching engine that alerts the agent within the hour of a new listing lifts conversion by 8 to 15 % depending on the agency, i.e. several extra deals per year.
Let's scope your project. Share your seat count, target portals and indicative budget: we scope an MVP then the full build. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
