The verdict in three sentences
A developer running 3 to 8 concurrent programmes needs to track reservations, drawdown schedules and variations in a single system. An industry SaaS at 50-120 EUR/user/month starts fast; a custom build at 45,000-95,000 EUR pays off once the buyer portal and off-plan tracking become commercial differentiators. The target gain is clear: +15 % sales velocity and full traceability of variation works.
What it really costs in 2026
Development editors bill per user with modular add-ons. Custom builds usually include a white-label buyer portal. 2026 orders of magnitude for a 6-20 person firm.
| Criterion | Industry SaaS | Custom build |
|---|---|---|
| Entry cost | 50-120 EUR/user/month | 45,000-95,000 EUR |
| Year 1 cost (12 users) | 7,200-17,300 EUR | 50,000-102,000 EUR |
| Year 3 cumulative | 21,600-51,800 EUR | 62,000-118,000 EUR |
| Buyer portal | Standard | White-label bespoke |
| Off-plan / drawdown tracking | Per module | Full |
| Time to launch | 4-8 weeks | 5-8 months |
| Variation management | Basic | Full workflow + quotes |
Below 8 users, SaaS is the pragmatic choice. Beyond that, and especially when buyer experience becomes a selling point, custom pays back over 24-36 months.
What software accelerates in sales
Sales velocity depends on the flow between option, reservation, notary signing and drawdowns. Digitising this chain cuts dead time.
| Step | Without dedicated tool | With platform | Gain |
|---|---|---|---|
| Option → signed reservation | 12-18 days | 6-9 days | -45 % |
| Drawdown follow-up | Manual, 5-8 day lag | Automatic | Cash +6 days |
| Variation tracking per unit | Scattered sheets | Centralised | 0 missed variation |
| Investor reporting | 1-2 days/month | Real time | ~1,400 EUR/month |
| Cancellation rate | 8-12 % | 5-7 % | -3 to -5 points |
On a 40-unit programme at 240,000 EUR, accelerating sales by 15 % can bring forward several months of cash and secure the financing plan.
What justifies custom for a developer
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Unlike a transaction agency, a developer creates value through the buyer experience over a long 18-to-36-month cycle. This is where custom fully makes sense in 2026. A white-label buyer portal that shows construction progress, lets buyers pick their variations online and centralises off-plan documents becomes a genuine selling point, especially against competitors on the same Amsterdam zones. Standard industry SaaS rarely offers this brand personalisation, and the experience stays generic. Second factor: drawdown traceability. A developer running 5 to 8 concurrent programmes manages dozens of regulated schedules (foundation completion, weathertight stage, etc.); automating these triggers avoids cash delays and compliance errors. Third factor: investor reporting. Funding rounds and bank financing demand reliable, fast reporting; a dedicated platform produces it in real time where a spreadsheet takes 1 to 2 days a month. Custom is therefore justified as soon as these three levers — brand, compliance, financing — become differentiators, generally beyond 8 users and 3 concurrent programmes.
Mini case study
Hélène is sales director at a development firm in Amsterdam: 5 active programmes, 180 units to sell in the year, average price 245,000 EUR. Her team loses 1.5 days per week on manual reporting and drawdown chasing, at 320 EUR/loaded day, or ~2,080 EUR/month. By digitising, she targets +15 % velocity: selling 180 units in 10 months instead of 11.5 brings forward ~2 months of revenue recognition. On a 72,000 EUR custom build, the admin time saved (~25,000 EUR/year) plus 3 fewer cancellation points (5 units × margin) pushes break-even below 14 months.
FAQ
What budget for a white-label buyer portal? Budget 12,000-25,000 EUR custom for a buyer portal (site tracking, variation choices, documents, drawdowns) — often the most commercially valued module.
How long to deploy a custom platform? Between 5 and 8 months for programmes + reservations + buyer portal + off-plan tracking, with a business V1 in 12-14 weeks.
Is SaaS enough for 4 or 5 programmes? Often yes, at 50-90 EUR/user/month, as long as you accept the editor's standard workflows. Custom is justified when buyer experience becomes a selling point.
Can variations be tracked end to end? Yes: a variation workflow (request, quote, approval, execution, re-billing) avoids the oversights that cost 2-4 % of the unit price in handover disputes.
What gain on cash flow? Automating drawdowns recovers on average 6 days of cash per cycle and cuts buyer payment delays.
Let's scope your project. Share your number of programmes, users and buyer-portal needs, and we will price SaaS vs custom with an indicative budget. 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.

