How much does it cost to build a web app?
It's the most Googled question in software development. And it gets the worst answers. "Anywhere from $5K to $500K." "It depends on complexity." "Contact us for a quote."
Here's the honest answer — broken down by build type, feature, and stage. Based on real projects we've scoped and delivered for startups in the US, UK, Canada, and Australia.
The Short Answer: Web App Development Cost in 2026
- Simple internal tool / CRUD app — $5K – $12K · 3–5 weeks
- Marketing site with custom backend — $8K – $15K · 4–6 weeks
- Web app MVP (3–5 features) — $8K – $20K · 5–8 weeks
- SaaS MVP (auth + billing + tenancy) — $15K – $30K · 6–10 weeks
- V1 product (full feature set) — $40K – $80K · 10–16 weeks
- Cross-platform (web + mobile) — $35K – $70K · 10–16 weeks
- Enterprise platform — $80K – $250K+ · 4–12 months
These are senior-agency rates for production-ready software — not offshore template shops, not $15/hr freelancers, not WordPress with a premium theme.
What Actually Drives Web App Development Cost
Feature Count — The Biggest Cost Driver
This is the number one lever. Not the technology. Not the design. The features. A web app with 4 focused features costs a fraction of one with 14. Not because 14 features takes 3x as long — it takes 8x as long. Every feature interacts with every other feature. What sounds like "one feature" is often four.The most expensive word in software development is "can we also add.
Authentication and User Management
Basic email and password login: 2–3 days. Now add social logins, multi-factor authentication, team accounts with invites, role-based permissions, and SSO for enterprise clients — you're looking at 3–4 weeks. Auth is one of the most underestimated cost items in any web app estimate. Shortcuts here are the shortcuts that end up in breach notification
Third-Party Integrations
Each integration — Stripe, Twilio, HubSpot, Salesforce, SendGrid, Zapier, Slack — adds 1–3 weeks of development time. APIs are never as clean as their documentation suggests.
Can we just add a Salesforce sync?" is never just one sprint.
Compliance Requirements
- HIPAA (healthcare): 4–8 weeks minimum
- SOC 2: 2–4 months of process documentation and infrastructure
- GDPR (EU users): 2–3 weeks for data deletion, consent management, data portability
- PCI DSS (card data): Almost always better to use Stripe and avoid touching card data directly
Real-Time Features
Real-time notifications, live dashboards, collaborative editing, chat — anything that updates without a page refresh requires WebSocket infrastructure and careful state handling. Add 1–3 weeks per real-time feature.
Infrastructure and DevOps
A Vercel deployment is one day. A production AWS setup with CI/CD pipelines, blue-green deployments, monitoring, and alerting is 2–4 weeks. It's not optional for production systems with real users.
AI and LLM Features
Budget 2–5 weeks for any meaningful AI feature. Prompt engineering, streaming responses, token cost management, fallback handling, output validation — these take time to do properly.
Web App Cost Breakdown by Stage
Stage 1: Simple Internal Tool ($5K – $12K)
Admin dashboards, internal reporting tools, client portals, booking systems. Single-purpose apps with a clear user flow.Included: authentication, 4–6 CRUD screens, basic integrations, production deployment, error monitoring.
Stage 2: Web App MVP ($8K – $20K)
The most common project type for early-stage startups. An MVP is not a prototype — it is the smallest version of your product that a real user can sign up for and get value from on day one.
Included: production-ready architecture, 3–5 core features, auth, one payment integration, CI/CD, basic analytics.
Stage 3: SaaS MVP ($15K – $30K)
SaaS costs more because of what's under the hood — multi-tenancy, billing lifecycle, subscription logic, dunning for failed payments, usage metering.
Stage 4: V1 Product ($40K – $80K)
Full feature set, admin dashboard, third-party integrations, email automation, onboarding flows, team accounts, architected to scale to tens of thousands of users. A V1 is typically 3–4x the cost of the MVP it follows.
Stage 5: Enterprise Platform ($80K – $250K+)
Compliance, SSO/SAML, custom permissions, documented APIs, SLA-grade infrastructure. If you're targeting enterprise customers, build like one from day one — retrofitting enterprise requirements onto a startup codebase costs as much as a fresh build.
Hidden Costs Most Estimates Miss
- Hosting: $200–$2,000/month on AWS or GCP depending on scale
- Ongoing maintenance: 10–20% of original build cost per year
- Performance optimization: What works at 100 users often needs engineering work at 10,000
- Security audits: $5K–$20K for a proper pentest before your first enterprise client
Fixed Price vs. Hourly
Hourly means the agency's incentive is hours, not outcomes. Every additional hour is revenue for them.
Fixed price forces the agency to scope clearly and build efficiently — overruns come out of their margin, not yours. It only works with a proper written spec covering every feature, exclusion, and acceptance criterion.
The Real Cost of Choosing the Cheapest Option
There are agencies that will build your web app for $3K–$8K. Here's what that timeline looks like:
Month 1: It looks like it works. The demo goes well.
Month 3: Bugs appear with real users. Fixes introduce new bugs.
Month 5–6: A senior developer reviews the code and finds: no tests, hardcoded API keys, SQL injection vulnerabilities, no architecture.
Month 7: You're paying a proper team to rebuild from scratch. Cost: $25K–$50K. Plus six months of lost momentum and burned runway.
A $5K build that requires a $35K rebuild did not save you $15K. It cost you an extra $20K and half a year.
How to Get an Accurate Quote
- Write a one-page brief — who the users are, what problem they have, what the 4–5 most important features are
- Book a discovery call — 30–60 minutes with the actual engineers, not a salesperson
- Ask for a written spec — not a slide deck, a document covering every feature and a fixed price
- Ask who will actually build it — names and LinkedIn profiles, not "our team"
Top comments (0)