SaaS Development Costs Explained: How Much Does It Take to Build a SaaS from Scratch?

Table of Contents

1. Let's Answer the Most Common Question First
2. The Cost Structure of SaaS Development
3. 1. Requirements Analysis and Architecture Design (10-15%)
4. 2. Frontend Development (25-35%)
5. 3. Backend + Database (20-30%)
6. 4. Subscriptions and Payments (10-15%)
7. 5. Deployment and DevOps (5-10%)
8. 6. Post-Launch Maintenance (Ongoing Cost)
9. Budget Reference by Scale
10. Smart Strategies to Save Money
11. Start with an MVP
12. Leverage Existing Services
13. Pick People Who Understand the Business Model
14. A Reference Build

Disclosure: Ultra Lab, MindThread and Ultra Advisor are products of the same group, Ultra Creation (傲創實業).

#Let's Answer the Most Common Question First

"How much does it cost to build a SaaS?"

Short answer: NT$50,000 to NT$500,000+, depending on feature complexity.

That's a wide range because "SaaS" can mean anything from a simple form tool to a full-blown enterprise management platform. Let's break down each variable.

#The Cost Structure of SaaS Development

#1. Requirements Analysis and Architecture Design (10-15%)

Before writing any code, you need to figure out:

• Who are your users?
• What are the core features? (What goes into the MVP?)
• What's the business model? (Subscription? Pay-per-use? Freemium?)
• What tech stack to choose?

This phase typically costs 10-15% of the total project, but it determines the direction for the remaining 85% of development. Skip this step and go straight to coding, and you'll end up spending 2-3x more than necessary.

#2. Frontend Development (25-35%)

Everything the user sees: login page, dashboard, settings, reports...

Mainstream technology choices:

• React + TypeScript: Largest ecosystem, rich component libraries, ideal for complex UIs
• Vue.js: Lower learning curve, suitable for small teams building quickly
• Next.js: If you need SEO (blogs, marketing pages)

Frontend costs depend on the number of pages and interaction complexity. A dashboard with 10 pages, charts, and real-time updates costs 3-5x more than 5 static pages.

#3. Backend + Database (20-30%)

Handling business logic, storing data, managing user authentication.

Two main approaches:

• Firebase (BaaS): No need to write backend APIs yourself: auth, database, storage, and deployment are all included. Best suited for 0-to-1 SaaS projects.
• Custom backend (Node.js/Python + PostgreSQL): More flexible, but longer development time and higher maintenance costs.

Why we recommend Firebase:

• Auth system: Google, email, and phone login in one line of code
• Firestore: Real-time syncing NoSQL database, naturally suited for SaaS
• Security rules: Access control without writing backend APIs
• Free quota: 50,000 reads and 20,000 writes per day, virtually zero cost during the MVP phase

If your data is heavily relational or your team prefers SQL, the other BaaS option is Supabase, built on PostgreSQL; see how to choose between Firebase and Supabase for the trade-offs.

#4. Subscriptions and Payments (10-15%)

One of the most critical SaaS features: letting users pay you.

What needs to be implemented:

• Plan management (free, basic, pro tiers)
• Payment integration (credit card, convenience store, bank transfer)
• Subscription lifecycle (upgrade, downgrade, cancel, renew)
• Invoicing / receipts

Common payment solutions in Taiwan:

• ECPay: Taiwan's largest local payment provider, supports convenience store and ATM payments
• Stripe: International standard, best API design, but less familiar to Taiwanese consumers
• Portaly: A newer option, suitable for small subscription services

#5. Deployment and DevOps (5-10%)

Getting your system online and accessible to users.

Recommended stack:

• Vercel: Frontend deployment, automatic CI/CD, global CDN
• Firebase Hosting: Static assets + Cloud Functions
• Custom domain: yourproduct.com with SSL certificate

The Vercel + Firebase combination keeps deployment costs near zero (during the low-usage MVP phase) with extremely high automation: one Git push triggers automatic deployment.

#6. Post-Launch Maintenance (Ongoing Cost)

SaaS doesn't end at delivery. After launch, you still need:

• Bug fixes: Users will find usage patterns you never anticipated
• Feature iteration: Continuous improvement based on user feedback
• Performance monitoring: Ensuring the system doesn't crash as users grow
• Security updates: Regular dependency updates

#Budget Reference by Scale

SaaS Type	Feature Scope	Budget Range
MVP / Validation	3-5 core pages, basic auth, one core feature	NT$50,000 - 100,000
Standard	10+ pages, subscription system, admin panel, analytics	NT$100,000 - 250,000
Full-Featured	Multi-role permissions, API integrations, advanced reporting, automation workflows	NT$250,000 - 500,000+

#Smart Strategies to Save Money

#Start with an MVP

Don't try to build the "full version" from day one. Build the minimum viable product first, validate market demand, then expand features. 80% of SaaS failures aren't due to bad technology; it's because nobody wanted the product.

#Leverage Existing Services

Use Firebase Auth for authentication, Stripe/ECPay for payments, Vercel for deployment. Don't reinvent the wheel.

#Pick People Who Understand the Business Model

Whoever builds it, engineers who understand how a subscription business actually makes money are worth far more than engineers who only write code. The right people cut features that do not earn their keep and push the budget toward the ones that do.

#A Reference Build

The numbers above read more clearly against a real example. We built Ultra Advisor on exactly this stack: React + TypeScript on the front end, Firebase for auth and data, and Vercel for deployment. It now runs 16 tools with a full subscription system.

The takeaway is not the total. It is that the stack chosen in week one decides most of the eventual bill, and that an MVP validated by real users is always cheaper than a full build nobody asked for.

FAQ

How much does it cost to build a SaaS?

Roughly NT$50,000 to NT$500,000+, depending on feature complexity. An MVP / validation build (3-5 core pages, basic auth, one core feature) runs about NT$50,000 to 100,000; a standard build (10+ pages, subscription system, admin panel, analytics) about NT$100,000 to 250,000; a full-featured build (multi-role permissions, API integrations, advanced reporting, automation workflows) about NT$250,000 to 500,000+.

How should a SaaS development budget be split across phases?

Requirements analysis and architecture design take about 10-15%, frontend development 25-35%, backend and database 20-30%, subscriptions and payments 10-15%, and deployment and DevOps 5-10%. After launch there are ongoing maintenance costs: bug fixes, feature iteration, performance monitoring and security updates.

Should a SaaS backend use Firebase or a custom backend?

Firebase (BaaS) means no backend APIs to write yourself: auth, database, storage and deployment are all included, which makes it best suited for 0-to-1 SaaS projects. Its free quota of 50,000 reads and 20,000 writes per day keeps the MVP phase at virtually zero cost. A custom backend (Node.js/Python + PostgreSQL) is more flexible, but takes longer to develop and costs more to maintain.

Which payment providers can a SaaS use for subscriptions in Taiwan?

Common options are ECPay (Taiwan's largest local payment provider, supports convenience store and ATM payments), Stripe (international standard with the best API design, but less familiar to Taiwanese consumers) and Portaly (a newer option suited to small subscription services). You need to implement plan management, payment integration, the subscription lifecycle (upgrade, downgrade, cancel, renew) and invoicing or receipts.

How can I reduce SaaS development costs?

Build an MVP first and expand features only after validating market demand. Use existing services: Firebase Auth for authentication, Stripe/ECPay for payments, Vercel for deployment, instead of reinventing the wheel. Do not skip requirements analysis; going straight to coding means spending 2-3x more than necessary. The Vercel + Firebase combination keeps deployment costs near zero during the low-usage MVP phase.