The verdict in three sentences
In 2026, a London real estate firm chooses between SaaS at 40-90 EUR per agent per month and custom software at 60-160k EUR one-off. SaaS wins when you have fewer than 12 agents and a standard need; custom pays off once manual listing entry, multi-portal publishing and buyer-to-mandate matching eat into your margin. The rule: past 20 agents, per-seat subscription exceeds amortising a proprietary tool over 4 to 5 years.
Real estate SaaS vs custom: the true 2026 cost
The SaaS trap is the per-seat price that climbs with every hire. Custom flips the logic: fixed cost amortised, then annual maintenance at 15-18 %.
| 2026 item | Real estate SaaS | Custom Kolonell |
|---|---|---|
| Licence | 40-90 EUR/agent/month | 0 |
| Upfront cost | 0-3,000 EUR (setup) | 60,000-160,000 EUR |
| 25 agents / year | 12,000-27,000 EUR | 0 after delivery |
| Annual maintenance | included | 15-18 % of one-off |
| Multi-portal gateway | paid add-on | built in |
| Data ownership | vendor | you |
| 5-year cost (25 agents) | 60,000-135,000 EUR | 105,000-208,000 EUR |
At 25 agents the gap narrows sharply by year 4; at 40 agents custom moves ahead before year 3.
The features that save time
Metier real estate software only helps if it attacks the agency's real time sinks. Here are the modules to price.
| Module | Measured 2026 gain | Dev complexity |
|---|---|---|
| Auto buyer/mandate matching | time cut by 3 | medium |
| Multi-portal publishing (Rightmove, Zoopla) | -35 % manual entry | medium |
| E-signature for mandates | -2 days per file | low |
| Legal mandate register | compliance | low |
| Commission tracking per mandate | payroll errors -90 % | medium |
| GDPR hosting in-region | data sovereignty | low |
The API multi-portal gateway is the item not to overlook: it removes double entry across Rightmove / Zoopla and frees half a day a week per agent.
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Mini case study
Thomas runs an agency in central London: 25 agents, sales and lettings. On SaaS at 70 EUR/agent/month he pays 21,000 EUR a year, i.e. 105,000 EUR over 5 years, excluding portal add-ons (another +6,000 EUR/year). He commissions custom software at 120,000 EUR + 18 % maintenance (21,600 EUR/year). Over 5 years: 120,000 + 86,400 = 206,400 EUR for custom against 135,000 EUR for SaaS with add-ons. The gap looks unfavourable, but custom saves 35 % of entry time across 25 agents (about 3 FTE freed at 45,000 EUR loaded): the real ROI is operational, not licensing. Verdict: Thomas keeps SaaS for a year, then switches at his 30th agent.
FAQ
How much does custom real estate management software cost in London in 2026? Budget 60,000 to 160,000 EUR one-off depending on scope (sales only, or sales + lettings + block management), plus 15 to 18 % annual maintenance. A sales MVP starts at 60,000 EUR.
From how many agents does custom pay off? Generally past 20 agents, annual SaaS subscription exceeds amortising custom over 4 to 5 years. Below 12, SaaS stays cheaper.
Can it auto-publish to Rightmove and Zoopla? Yes, via an API multi-portal gateway. It removes about 35 % of manual entry and avoids listing inconsistencies across portals.
Is the data GDPR-compliant? With in-region hosting and a processing register, yes. You keep ownership of your prospect and mandate base with no dependency on a foreign vendor.
What delivery time should I expect? A custom sales tool ships in 3 to 5 months; add 2 to 3 months for lettings and rent receipting.
Let's scope your project. Tell us your agent count, target portals and whether you include lettings: we price SaaS vs custom over 5 years. 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.
