The verdict in three sentences
For a developer running 3 to 8 projects in parallel, custom off-plan sales tracking software costs USD 44,000 to 82,000 in 2026 (EUR 40,000 to 75,000), delivered in 14 to 20 weeks. It replaces shared spreadsheets with a real-time unit grid, automatic deposit calls tied to construction milestones and a buyer portal that absorbs most phone calls. Compared with market solutions at USD 900 to 2,200 per month, custom becomes cost-effective once your processes (buyer upgrades, closing agents, external brokers) depart from the standard.
What a developer must manage across 320 units
A 60-unit pre-construction project generates hundreds of events: holds, reservations, deposits, mortgage approvals, contract signings, buyer upgrade requests, milestone deposit calls, delivery and punch lists. When this information lives in several files, leadership finds out too late that a unit was reserved twice, that a buyer never received a milestone call or that the closing agent has been waiting for a document for three weeks.
The software must cover:
- Real-time unit grid per project: available, on hold, reserved, under contract, delivered, with prices and incentives.
- Reservation tracking: deposit, rescission period, financing contingency, automatic reminders.
- Deposit calls following the contract schedule (for example 10% at contract, 10% at groundbreaking, 10% at top-off, balance at closing), triggered by the architect's milestone certificate, with escrow tracking.
- Buyer upgrades: requests, quotes, approval, impact on price and schedule.
- Buyer portal: documents, deposit calls, construction photos, appointment booking.
- Closing agents and external brokers, with their commissions.
| Module | Indicative 2026 cost (USD) | Timeline | Main gain |
|---|---|---|---|
| Unit grid and project master data | 7,700 to 13,200 | 3 weeks | No double reservation |
| Reservations, rescission and financing | 6,600 to 12,100 | 3 weeks | Automatic reminders at day 10 and 30 |
| Automatic deposit calls | 7,700 to 14,300 | 3 weeks | Issued on certificate day |
| Buyer upgrade management | 5,500 to 9,900 | 2 weeks | Upgrade quotes within 48 h |
| Buyer portal | 8,800 to 16,500 | 4 weeks | −50% inbound calls |
| Closing agents and brokers | 4,400 to 8,800 | 2 weeks | Error-free commissions |
| Executive dashboard | 3,300 to 7,700 | 2 weeks | Contracted and collected revenue per project |
Custom or market solution: what to compare
Market platforms for developers are comprehensive, but pricing rises with the number of projects and users, and configuration follows their logic. For a mid-sized regional developer, the decision plays out over 5 years.
| Criterion (5 projects, 320 units, 8 users) | Market solution | Custom build with Kolonell |
|---|---|---|
| Setup | USD 3,300 to 11,000 | USD 44,000 to 82,000 |
| Monthly cost | USD 900 to 2,200 | Maintenance USD 550 to 1,000 |
| Cost over 5 years | USD 57,000 to 143,000 | USD 77,000 to 142,000 |
| Buyer upgrades and specific processes | Limited configuration | Your rules |
| Branded buyer portal | Often a paid add-on | Included |
| Ownership of code and data | Vendor | You |
| Accounting and construction integrations | Standard connectors | Custom |
Order of magnitude 2026, with EUR 1 at about USD 1.10. For 1 or 2 projects a year, a market solution stays simpler. Beyond 4 simultaneous projects, custom compares favorably.
Mini case study
Robert, CEO of a Miami developer, runs 5 projects totaling 320 units at an average of USD 285,000. His sales administration team spends about 0.8 full-time equivalent consolidating files, i.e. USD 52,000 a year. Deposit calls go out on average 10 days after the architect's certificate.
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With about USD 36,000,000 called per year and a 5% cost of financing, issuing calls 10 days earlier yields 36,000,000 × 5% × 10 / 365 = about USD 49,000 a year. Added to the USD 52,000 of recovered time, the gain reaches USD 101,000 a year, for an investment of USD 64,000 and USD 9,200 of annual maintenance. The project pays back in under a year.
FAQ
How much does off-plan sales software for a developer cost?
Budget USD 44,000 to 82,000 (EUR 40,000 to 75,000) depending on modules, plus USD 550 to 1,000 of monthly maintenance. The buyer portal alone often accounts for about USD 16,000.
Do deposit calls follow the contract schedule?
Yes, each project's schedule and caps are configured and block any non-compliant call. The call is generated as soon as the architect's certificate is uploaded, within minutes.
Can we include our external brokers?
Yes, each broker gets access limited to their units, places holds and sees their commissions. Double reservations disappear, and 3 to 5% commissions are calculated automatically.
Do buyers really use the online portal?
In equipped projects, 70 to 80% of buyers log in at least once a month. Inbound calls to customer service often drop by half.
How long does it take to migrate our spreadsheets?
Importing 320 units, buyers and payment history takes 2 to 3 weeks. A pilot project is usually live by week ten.
Let's scope your project. Send us your number of projects, units and upgrade processes, and we will price a scope between USD 44,000 and 82,000 on a 14 to 20 week plan. 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.
