The verdict in three sentences
For a solo contractor or micro-firm, a quote-and-invoice SaaS at 20-45 EUR/month covers the essentials: works library, progress billing, compliant e-invoicing. Once you have a very specific works library or atypical processes, a custom build at 15,000-40,000 EUR becomes relevant. In 2026, mandatory e-invoicing makes compliance non-negotiable, alongside admin time saved.
SaaS vs custom: the 2026 comparison
A construction quote-invoice tool handles a works library, progress billing (stage completion), multi-rate VAT and e-invoice issuance. Here are 2026 orders of magnitude.
| Criterion | Construction SaaS | Custom build |
|---|---|---|
| Works library | Standard | 4,000-9,000 EUR (specific) |
| Progress billing | Included | 3,000-7,000 EUR |
| Multi-rate VAT + reverse charge | Included | 2,000-5,000 EUR |
| 2026 e-invoicing | Included | 4,000-9,000 EUR |
| Entry cost | 0 EUR | 15,000-40,000 EUR |
| Monthly cost | 20-45 EUR | 100-330 EUR (maintenance) |
| Lead time | Immediate | 6-12 weeks |
| Customization | Low | Full |
The SaaS wins clearly for a standard need. Custom is justified only with a very specific works library or atypical billing flow.
Three-year TCO and admin ROI
Time spent producing quotes and invoices is the contractor's real hidden cost. Compare over three years.
| Line item (3 yrs) | SaaS | Custom |
|---|---|---|
| Subscription / development | 720-1,620 EUR | 15,000-40,000 EUR |
| E-invoicing | Included | Included |
| Maintenance (10 %/yr) | Included | 4,500-12,000 EUR |
| Initial setup | 0-500 EUR | Included |
| 3-year TCO | 720-2,120 EUR | 19,500-52,000 EUR |
For the vast majority of contractors, SaaS is unbeatable. Custom targets firms whose pricing process is a competitive advantage worth protecting.
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Mini case study
Bruno runs an 8-person plumbing-heating firm in Amsterdam. He spent 6 hrs/week writing quotes and invoices, i.e. 26 hrs/month at a loaded 40 EUR/hr, or 1,040 EUR/month. Switching to a tool with a works library and progress billing cuts this by 60 %, recovering 624 EUR/month. With a SaaS at 39 EUR/month, payback is immediate. A custom build at 22,000 EUR would only be justified if his very specific renovation pricing library saved more, which it doesn't here: SaaS stays the right call.
FAQ
Is e-invoicing mandatory in 2026? Yes, the reform is rolling out progressively for firms. Any serious tool, SaaS or custom, must issue compliant-format invoices and transmit via an approved platform.
Does a SaaS handle progress billing? Yes, most construction tools handle stage billing and retention. In custom, budget 3,000-7,000 EUR for this module.
When does custom become relevant? When your works library or pricing process is too specific for a SaaS, which is rare under 10 employees.
How much is a custom tool? From 15,000 to 40,000 EUR depending on modules, delivered in 6-12 weeks, with 8-12 %/yr maintenance.
Does the SaaS handle reduced VAT and reverse charge? Yes, construction tools handle reduced rates (renovation) and subcontracting reverse charge. Check your tool covers your cases.
Let's scope your project. Share your headcount, monthly quote volume and how specific your works library is, and we'll steer you to a configured SaaS or the most profitable custom build. 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.
