The verdict in three sentences
At 350 units handed over a year, the off-plan buyer relationship means thousands of emails: progress payment notices, finishing choices, variation requests and defect lists at handover. A developer CRM at roughly 650-2,200 USD a month handles sales well, much less the after-sales journey up to key collection. A custom buyer portal at about 38,000-82,000 USD (35,000-75,000 EUR), with e-signature of variation agreements and delivered in 4 to 6 months, saves 2 to 3 days per project at handover and frees the sales administration team.
Where time and money go in off-plan sales
Between booking and handover, a buyer goes through 2 to 4 years and a dozen contractual steps under the progressive payment scheme. 2026 order of magnitude for a mid-size developer in Singapore:
| Off-plan step | Volume per buyer | Current workload (order of magnitude) |
|---|---|---|
| Progress payment notices | 8-10 stages | 20-30 min per stage in reminders and documents |
| Finishing choices | 1 catalogue, 10-25 options | 1-2 h of exchanges per buyer |
| Variation requests | 0-3 agreements | Quote, signature, invoicing: 1-3 h |
| Construction progress questions | 8-15 emails | 2-3 h over the project |
| Handover appointment | 1 appointment and checklist | Scheduling: 30-45 min |
| Defect rectification | 3-10 defects on average | Contractor follow-up: 1-2 h |
Across 350 buyers, that easily exceeds 2,500 to 3,500 hours a year of admin work, spread across sales admin, customer service and site teams.
Market CRM or custom portal: the comparison
| Criterion | Developer CRM | Custom buyer portal |
|---|---|---|
| Cost | 650-2,200 USD/month (7,800-26,400 USD/year) | 38,000-82,000 USD, then 650-1,300 USD/month |
| Units and bookings | Excellent | Pulled from the CRM by API |
| Progress payments online | Depends on vendor | Schedule visible, statements downloadable |
| Finishing choices | Rarely interactive | Configurator with prices and deadline |
| Variations and addenda | Usually outside the tool | Quote, e-signature and invoicing |
| Defects at handover | Separate tools | Photo capture, tracking per contractor |
| Timeline | 1-3 months | 4-6 months |
The usual setup keeps the CRM for sales and adds the portal for after-sales. E-signature costs about 1 to 3 USD per envelope, a marginal line next to the time saved.
What the portal must include
- Buyer space per unit: contract, payment schedule, notices, statements for the bank.
- Finishing configurator with photos, price differences and closing date.
- Variations module: request, quote, e-signature of the addendum, invoicing.
- Construction updates per project, with monthly photos.
- Handover module: booking, checklist, photographed defects, contractor reminders.
Mini case study
Wei Ling, sales director of a Singapore developer, hands over 350 units a year across 7 projects. Saving 2.5 days per project at handover for a 3-person team at 450 USD per loaded day gives 7 x 2.5 x 3 x 450 = 23,625 USD a year. Add about 5 hours of exchanges avoided per buyer at 45 USD an hour, so 350 x 5 x 45 = 78,750 USD. For a portal at 60,000 USD and 11,000 USD of yearly maintenance, payback comes in about 8 months.
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FAQ
Should we drop our developer CRM?
No. The CRM stays the sales tool at 650-2,200 USD a month. The portal connects to it by API to fetch units, buyers and payment schedules.
Is e-signature valid for variation agreements?
Yes, an advanced electronic signature fits variation addenda and finishing choices. The sale and purchase agreement itself follows the usual legal process.
How long to launch the portal?
Plan 4 to 6 months, with a pilot on one project of 40 to 60 units before rollout.
Do buyers really use this kind of portal?
When payment notices and bank statements are available there, adoption usually passes 70% of buyers within the first months, according to industry feedback.
What maintenance budget should we plan?
Budget 650 to 1,300 USD a month for hosting, security and changes, so 7,800 to 15,600 USD a year.
Let's scope your project. Share your unit volume, current CRM and off-plan steps: we will price a buyer portal in the 38,000-82,000 USD range, with a pilot project in 4 to 6 months. 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.
