2026-03-25·Guide·7 min read
Build vs Buy ERP: Which Is Actually Cheaper?
The question every growing SME faces
At some point, spreadsheets stop working. You need a proper system to manage inventory, orders, invoicing, and reporting. The question is: do you buy an off-the-shelf ERP, or build one?
Option 1: Buy (SaaS ERP)
Popular options for SMEs:
| Platform | Starting Price | What You Get |
|---|---|---|
| NetSuite | $99/user/mo + $999 platform | Full ERP suite |
| SAP Business One | $94/user/mo | Modular ERP |
| Odoo Enterprise | $31/user/mo | Open-source based |
| Zoho One | $45/user/mo | Suite of 45+ apps |
Pros:
- Fast to deploy (weeks, not months)
- Maintained and updated by the vendor
- Established integrations
Cons:
- Per-seat pricing scales poorly
- Customization is limited or expensive
- You don't own the data infrastructure
- Vendor decides when features change or prices go up
Option 2: Build (Custom ERP)
A custom ERP built for your specific workflow.
Typical costs:
- Simple (inventory + orders): $15,000–$25,000
- Medium (+ invoicing, reporting): $25,000–$50,000
- Full (multi-module, integrations): $50,000–$100,000
Pros:
- One-time cost (no recurring per-seat fees)
- Built around YOUR workflow, not a generic template
- You own the code and data
- Unlimited users at no extra cost
Cons:
- Takes longer to launch (2-6 months)
- You're responsible for maintenance
- Needs a development partner you trust
The 3-year comparison
Let's say you have 20 users and need a medium-complexity ERP.
| SaaS (NetSuite) | Custom Build | |
|---|---|---|
| Year 1 | $35,760 | $40,000 (build) + $2,400 (hosting) |
| Year 2 | $37,550 (+5%) | $2,400 (hosting) |
| Year 3 | $39,425 (+5%) | $2,400 (hosting) |
| 3-Year Total | $112,735 | $47,200 |
| Savings | - | $65,535 |
And in year 4 and beyond, the gap only widens.
When building makes sense
Build when:
- You have stable, well-understood processes
- Your team is 10+ people (per-seat pricing hurts)
- You need features no off-the-shelf tool offers
- You want to own your data completely
When buying makes sense
Buy when:
- You're very early stage and still figuring out your process
- You need something running this week
- Your team is under 5 people (per-seat costs are manageable)
- You don't have a trusted development partner
The hybrid approach
Many of our clients start with a focused build covering just the modules they need most, then expand over time. Start with a custom CRM, keep your accounting in Xero, and add inventory management when you're ready.
You don't have to replace everything at once.