The verdict in three sentences
A London estate agency loses time on multi-portal re-keying and lets leads slip through poor buyer/property matching. A metier SaaS (50-120 GBP per agent/month) covers the standard; a custom build of 35,000 to 80,000 GBP pays off when you want a tool connected to your own site, with automatic syndication and integrated e-signature. The gain reads in data-entry time saved and extra qualified leads.
Metier SaaS or custom: where the value sits
The difference is not the monthly price but the level of integration with your site and flows. 2026 orders of magnitude for an 8-agent agency.
| Item | Metier SaaS | Custom |
|---|---|---|
| Licence/agent/month | 50-120 GBP | 0 + hosting |
| Annual cost, 8 agents | 4,800-11,520 GBP | 2,000-4,000 GBP hosting |
| Multi-portal syndication | Included (partner portals) | Custom, all portals |
| Buyer/property matching | Standard | Custom scoring |
| E-signature | Option +4-12 GBP/deal | Integrated |
| Site connection | Limited widget | Native, real time |
| Initial development | 1,200-4,000 GBP | 35,000-80,000 GBP |
Over three years, the SaaS for 8 agents costs 14,000 to 35,000 GBP excluding signature options. A custom build connected to your site pays back once extra qualified leads produce a few more sales.
The ROI: data entry and qualified leads
The two measurable gains of a well-integrated transaction tool.
| Metric | Before | After custom |
|---|---|---|
| Entry time/listing | 25-40 min | -25% (18-30 min) |
| Qualified leads via site | Baseline | +10% |
| Time to publish | 1-2 days | A few hours |
| Automatic match rate | 0% | 40-60% of mandates |
| Deals e-signed | 10% | 70-80% |
For an agency earning 1M GBP in commissions/year, +10% qualified leads converting into 2 extra sales at 7,000 GBP commission = 14,000 GBP of additional annual revenue.
Mini case study
James, director of an 8-agent agency in London, syndicated manually to 4 portals. Investment: a custom build at 50,000 GBP with automatic syndication, buyer/property matching and e-signature. Gain: 20 minutes saved per listing across 120 listings/month = 40 hours/month valued at 30 GBP = 14,400 GBP/year, plus 3 extra sales at 7,000 GBP = 21,000 GBP. Total 35,400 GBP/year: investment paid back in 17 months.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Do you need custom when SaaS already exists?
Only if integration with your site and flows is strategic. If you want a lead-capture funnel tied to your brand and automatic multi-portal syndication, a 35,000-80,000 GBP custom build pays off. Otherwise a SaaS is enough.
How much does e-signature cost per deal?
In SaaS, 4 to 12 GBP per signed deal as an option. In custom it is built into the project budget and unlimited, which becomes worthwhile beyond a few hundred deals per year.
What lead gain to expect from the connected site?
Around +10% qualified leads, because properties go live faster and the contact form feeds the CRM directly. Every lead captured in real time converts better.
How long to deploy?
Between 10 and 16 weeks for a custom build including site connection, mandate migration and agent training. A SaaS deploys in 3 to 5 weeks.
Can you keep your usual portals?
Yes. Custom syndication adapts to the portals you already use (Rightmove, Zoopla, regional portals), with automatic sending and tracking of published listings.
Let's scope your project. Tell us your number of agents, your portals and your listing volume for an indicative budget between 35,000 and 70,000 GBP. 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.
