tools-only 💵 Step 3: Cost Estimate - Static Web Application
- 💵 Cost At-a-Glance
- ✅ Decision Summary
- 🔁 Requirements → Cost Mapping
- 📊 Top 5 Cost Drivers
- 🏛️ Architecture Overview
- 🧾 What We Are Not Paying For (Yet)
- ⚠️ Cost Risk Indicators
- 🎯 Quick Decision Matrix
- 🧩 Change Control
- 💰 Savings Opportunities
- 🧾 Detailed Cost Breakdown
- 📋 Monthly Cost Summary
- 🔗 References
Generated by @architect agent | 2026-01-12
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|---|---|---|
| 02-architecture-assessment.md | README | 04-governance-constraints.md |
Region: swedencentral (Sweden Central) | Environment: Development | MCP Tools Used: azure_price_search | Architecture Reference: Architecture Assessment
💵 Cost At-a-Glance
Monthly Total: ~$15 | Annual: ~$180
Budget: $50/month (soft) | Utilization: 30% (~$15 of $50)
Status Indicator Cost Trend ➡️ Stable Savings Available 💰 $0/year (already using free tiers) Compliance ✅ None (internal tool)
✅ Decision Summary
- ✅ Approved: Single-region, cost-optimized dev/test workload; keep SWA/Functions on free tiers
- ⏳ Deferred: Private endpoints, multi-region DR, dedicated always-warm compute
- 🔁 Redesign Trigger: If this becomes production-critical or traffic increases materially, SQL tier and SWA tier change
Confidence: Medium | Expected Variance: ±25% (SQL tier/usage and logs are the primary uncertainty)
🔁 Requirements → Cost Mapping
| Requirement | Architecture Decision | Cost Impact | Mandatory |
|---|---|---|---|
| Internal tool, low criticality | Single region | Baseline | Yes |
| ~$50/month soft budget | SWA Free + Functions Consumption | -$9/month 📉 | Yes |
| Basic availability target | SQL S0 baseline + alerts | Baseline | Yes |
📊 Top 5 Cost Drivers
| Rank | Resource | Monthly Cost | % of Total | Trend |
|---|---|---|---|---|
| 1️⃣ | Azure SQL Database (S0) | $14.52 | 99% | ➡️ |
| 2️⃣ | Azure Monitor alert rules (x2) | $0.20 | 1% | ➡️ |
| 3️⃣ | Azure Static Web Apps (Free) | $0.00 | 0% | ➡️ |
| 4️⃣ | Azure Functions (Consumption, integrated) | $0.00 | 0% | ➡️ |
| 5️⃣ | Application Insights / Log Analytics (<5 GB) | $0.00 | 0% | ➡️ |
💡 Quick Win: If usage is sporadic, evaluate Azure SQL serverless to reduce idle-time spend.
Summary
| Metric | Value |
|---|---|
| 💵 Monthly Estimate | $15 - $18 |
| 📅 Annual Estimate | $180 - $216 |
| 🌍 Primary Region | swedencentral |
| 💳 Pricing Type | List Price (PAYG) |
| ⭐ WAF Score | 7.2/10 (avg of pillar scores) |
| 🎯 Target Users | 10 concurrent |
Business Context
This workload is an internal tool for workflow validation testing. The architecture intentionally optimizes for cost while meeting the stated 99.9% availability target for a non-critical internal app.
🏛️ Architecture Overview
Cost Distribution
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pie showData
title Monthly Cost Distribution ($)
"💾 Data Services" : 14.52
"🔐 Security/Mgmt" : 0.20
Key Design Decisions Affecting Cost
| Decision | Cost Impact | Business Rationale | Status |
|---|---|---|---|
| Static Web Apps Free tier | -$9/month 📉 | Stay within $50 budget for dev/test | Required |
| SQL Database S0 (10 DTU) | Baseline | Lowest managed SQL tier for light usage | Required |
| No private endpoints | -$7.30/endpoint 📉 | Public endpoints acceptable for internal tool | Accepted |
| Single region deployment | Baseline | DR not required; cost-optimized | Required |
🧾 What We Are Not Paying For (Yet)
- Multi-region DR (active-active or warm standby)
- Private endpoints for PaaS services
- Dedicated always-warm compute for Functions
- Higher SQL tier for sustained throughput
⚠️ Cost Risk Indicators
| Resource | Risk Level | Issue | Mitigation |
|---|---|---|---|
| Azure SQL Database S0 | 🟡 Medium | DTU saturation may require tier upgrade | Alert on DTU > 80%, review monthly |
| Log ingestion | 🟡 Medium | Exceeding free ingestion increases cost | Cap verbosity; set retention targets |
| Data egress | 🟢 Low | Low expected egress for internal users | Monitor monthly egress |
⚠️ Watch Item: If transactions/day grows beyond projections, SQL tier upgrades become the primary cost driver.
🎯 Quick Decision Matrix
"If you need X, expect to pay Y more"
| Requirement | Additional Cost | SKU Change | Notes |
|---|---|---|---|
| Production-ready SWA features | +$9/month | Static Web Apps: Free -> Standard | Staging/enterprise features |
| Higher DB throughput | +$15/month (est.) | SQL: S0 -> S1 | Use when DTU is consistently high |
| Dedicated / always-warm compute | +$120/month (est.) | Functions: Consumption -> Premium | Avoid for this budget unless required |
🧩 Change Control
| Change Request | Delta | Notes |
|---|---|---|
| Promote to production (SWA Standard) | +$9/month | Enables production SWA features |
| Upgrade DB tier (S0 -> S1) | +$15/month (est.) | Triggered by sustained DTU saturation |
| Dedicated compute (Functions Premium) | +$120/month (est.) | Only if strict latency/always-warm required |
💰 Savings Opportunities
Total Potential Savings: $0/year
This design already uses free/lowest tiers aligned to the requirements.
Additional Optimization Strategies
| Strategy | Potential Savings | Effort | Notes |
|---|---|---|---|
| Keep SWA on Free for dev/test | $9/month | 🟢 Low | Upgrade only if production features are needed |
| Reduce log ingestion | Variable | 🟡 Medium | Avoid verbose logs; tune sampling |
| Evaluate SQL serverless (if idle-heavy) | Variable | 🟡 Medium | Only beneficial if workload is frequently idle |
🧾 Detailed Cost Breakdown
💻 Compute Services
| Resource | SKU | Qty | $/Hour | $/Month | Notes |
|---|---|---|---|---|---|
| Static Web Apps | Free | 1 | - | $0.00 | Pricing not returned for Free tier via MCP query |
| Azure Functions | Consumption | 1 | - | $0.00 | Integrated with SWA; usage expected to stay in free grants |
💻 Compute Subtotal: ~$0.00/month
💾 Data Services
| Resource | SKU | Config | $/Unit | $/Month | Notes |
|---|---|---|---|---|---|
| Azure SQL Database | S0 (10 DTU) | Single DB | $0.4839/day | $14.52 | $0.4839 * 30 days (MCP) |
💾 Data Subtotal: ~$14.52/month
🔐 Security/Management
| Resource | SKU | Config | $/Unit | $/Month | Notes |
|---|---|---|---|---|---|
| Azure Monitor | Alerts | 2 rules | $0.10/month | $0.20 | MCP shows multiple alert prices; using $0.10/rule estimate |
🔐 Security/Management Subtotal: ~$0.20/month
📋 Monthly Cost Summary
| Category | Monthly Cost | % of Total | Trend |
|---|---|---|---|
| 💻 Compute | $0.00 | 0% | ➡️ |
| 💾 Data Services | $14.52 | 99% | ➡️ |
| 🔐 Security/Mgmt | $0.20 | 1% | ➡️ |
| Total | ~$14.72 | 100% |
Cost Distribution:
💾 Data ████████████████████████████████████████░░ 99%
🔐 Sec/Mgmt █░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ 1%
💻 Compute ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ 0%
🧮 Base Run Cost vs Growth-Variable Cost
| Cost Type | Drivers | Examples | How It Scales |
|---|---|---|---|
| Base run | fixed SKUs | SQL S0 | step-changes (tier upgrades) |
| Growth-variable | usage-based | logs, alerting, egress | increases with users/traffic |
🌍 Regional Comparison
| Region | SQL S0 Cost | vs. Primary | Data Residency | Recommendation |
|---|---|---|---|---|
| swedencentral | $14.52/mo | Baseline | EU (Sweden) ✅ | Selected |
| germanywestcentral | $14.52/mo | +0.0% | EU (Germany) | Alternative EU option |
| westeurope | $14.52/mo | +0.0% | EU (Netherlands) | Alternative EU option |
| eastus | $14.52/mo | +0.0% | US | Lowest-latency for US-only users |
💡 Decision: swedencentral selected for EU preference and default region standards.
🔧 Environment Strategy (FinOps)
- Production: Not applicable (design is dev/test).
- Non-prod: Keep SWA/Functions on free tiers; only upgrade SQL tier when DTU saturation persists.
🔄 Environment Cost Comparison
| Environment | Monthly Cost | vs. Dev | Notes |
|---|---|---|---|
| Development | $14.72 | Baseline | Free/lowest tiers |
| Staging | $14.72 | 0% | Same footprint (single environment pattern) |
| Production (if upgraded) | ~$23.72 | +61% | SWA Standard (+$9) |
🛡️ Cost Guardrails
| Guardrail | Threshold | Action |
|---|---|---|
| Budget alert | 80% / 100% of $50 | Notify / require approval to upgrade tiers |
| SQL DTU utilization | >80% sustained | Evaluate S0 -> S1 or serverless |
| Log ingestion | >1 GB/week | Tune verbosity, sampling, and retention |
| Data egress | >50 GB/month | Investigate caching/CDN and traffic sources |
📝 Testable Assumptions
| Assumption | Why It Matters | How to Measure | Threshold / Trigger |
|---|---|---|---|
| Logs <= 5 GB/month | avoids ingestion costs | Log Analytics usage | >5 GB/month |
| SQL S0 sufficient | prevents tier upgrade | SQL DTU metrics | >80% sustained |
| Low egress | keeps networking costs low | Azure Cost Mgmt | >50 GB/month |
📝 Assumptions
- SQL billing basis: $0.4839/day for SQL Database S0 in swedencentral (MCP) x 30 days
- Alerting: 2 alert rules at ~$0.10/month each (estimate; MCP returned multiple alert prices)
- Logs: assumed <= 5 GB/month to stay within common free grants
- Usage: 730 hours/month for always-on services
- Prices queried: 2026-01-12 via Azure Pricing MCP
- Pricing: Azure retail list prices (pay-as-you-go)
📊 Pricing Data Accuracy
📊 Data Source: Prices retrieved from Azure Retail Prices API via Azure Pricing MCP
✅ Included: Retail list prices (PAYG)
❌ Not Included: EA discounts, CSP pricing, negotiated rates, Azure Hybrid Benefit
💡 For official quotes, validate with the Azure Pricing Calculator
Generated by Azure Agentic InfraOps | GitHub