Costs
How Custom Development Is Priced
Custom development is priced using one of three main models: time and materials, fixed price, or retainer. Each shifts the financial risk differently between you and the developer. Understanding these models is essential to budgeting accurately and avoiding surprises.
Time & Materials: The Hourly Model
Time and materials (T&M) is the most common pricing model. You pay for the number of hours worked at an agreed hourly rate. If development takes 400 hours at $150/hour, you pay $60,000. If it takes 500 hours, you pay $75,000. The developer bills what they actually spend.
In Australia, experienced developers typically charge $100–$250 per hour depending on location, seniority, and specialization. A junior developer in a regional area might charge $60–$100/hour. A senior full-stack developer at a Sydney agency might charge $200–$300/hour. Rates scale with expertise and demand.
The advantage of T&M: if requirements change mid-project, you don't renegotiate. The developer logs their time, you pay. There's clarity on what you're paying for—hours worked. The developer isn't pressured to cut corners to stay under a fixed budget.
The disadvantage: the financial risk is on you. If the developer estimates poorly or the project becomes more complex than expected, the bill grows. There's no cap. You must trust the developer to estimate reasonably and work efficiently.
Fixed Price: The Lump Sum Model
Fixed price means the developer quotes a single amount to deliver the complete project. "This project will cost $80,000." If it takes them 500 hours or 800 hours, you still pay $80,000. The risk is entirely on the developer.
Fixed-price projects require detailed scoping upfront. The developer must understand exactly what they're building—features, integrations, design, testing, everything. Any scope change triggers a change order (a formal request to add/remove work and adjust the price).
The advantage: financial predictability. You know the exact cost before work begins. No surprises. You budget knowing the final bill will match the quote (assuming scope doesn't change). This appeals to business owners who need fixed budgets.
The disadvantage: fixed-price quotes are higher than T&M estimates because the developer builds in a risk buffer. They're padding the estimate to cover unknowns. If the project runs smoothly, you might have overpaid. Additionally, scope creep becomes contentious—every change request triggers negotiation.
Fixed-price projects also create perverse incentives. The developer wants to finish quickly to maximize margin. They may resist the discovery phase or design iteration. Quality can suffer if the developer rushes.
Retainer: The Ongoing Allocation Model
A retainer is a monthly fee for a guaranteed amount of developer time. "We'll allocate 20 hours per week for $4,000/month." You get consistent access to a developer or team. They prioritize your work over other clients. Any work up to the monthly allocation is covered; work beyond that is billed extra.
Retainers work well for ongoing maintenance, feature development, and evolving projects. You don't negotiate a new contract for each small task. The developer is familiar with your codebase and can move quickly.
The advantage: predictable cost and predictable availability. You can plan feature development on a monthly cycle. The developer becomes a trusted extension of your team. This is often cheaper than hiring a part-time employee if you only need 10–30 hours per week.
The disadvantage: you must use your allocated hours or lose them (depending on the contract). If you allocate 20 hours per week but only need 10, you're paying for unused capacity. Retainers also lock you into a relationship; if the developer is unresponsive or poor quality, you're committed for the month.
Retainers typically cost less per hour than pure T&M. A developer charging $200/hour for T&M might offer a retainer at $150/hour because of the predictability and guaranteed allocation.
Day Rates vs Hourly Rates
Some developers quote day rates instead of hourly rates. A day rate is typically 8 hours of work. If someone charges $1,200 per day, that's $150/hour. Day rates are common for consulting, discovery workshops, and onsite work.
Day rates are convenient because you don't track minutes; you contract for full days. For distributed remote teams, hourly rates are more standard.
What Drives Rate Variation
Location and cost of living: A developer in Sydney costs more than one in regional Australia or a smaller city. Cost of living, office space, taxes, and demand all factor in.
Seniority: A junior developer with 1–2 years of experience might charge $80–$120/hour. A mid-level developer with 5 years costs $130–$180/hour. A senior architect with 10+ years and specialized expertise commands $200–$300+/hour.
Technology specialization: A JavaScript full-stack developer is more common (lower rates). A developer specializing in rare or complex domains (blockchain, real-time systems, machine learning) commands higher rates due to scarcity.
Agency vs freelancer: Freelancers charge less than agencies because they have lower overhead. An agency bills $250/hour where a freelancer might charge $150/hour for similar work—the agency is covering rent, benefits, sales, and management costs.
What's Included in a Development Quote
When a developer quotes $50,000 for a project, that cost typically covers:
Discovery & scoping: Understanding requirements, documenting the specification, identifying risks and unknowns. Usually 5–10% of total project cost.
Design: UI/UX design, wireframes, mockups. Could be $3,000–$15,000 depending on complexity.
Development: Writing code, integrating third-party services, building features. Usually 50–70% of cost.
Testing: Unit tests, integration tests, user acceptance testing. Often 10–20% of cost.
Deployment & setup: Configuring hosting, setting up CI/CD, configuring monitoring. Usually 5–10%.
Documentation: Code documentation, user guides, deployment runbooks. Often 5–10%.
Ask your developer to itemize what's included. Some developers include support for the first month post-launch; others don't. Some include design; others expect you to hire a designer separately.
Hidden Costs & What's Often Overlooked
Project management: Many developers don't explicitly bill PM hours. They're built into their estimate, but they do add up—weekly standups, requirement clarification, status reports.
Revision and refinement rounds: "Can you tweak the button color?" and "Can we add a filter?" accumulate. In T&M, they're billed. In fixed-price, they may be included in the scope, but the first quote didn't anticipate how many revisions you'd request.
Third-party integrations: If your app needs to integrate with Stripe for payments, Twilio for SMS, or Salesforce for CRM, each integration adds complexity and cost. The developer must understand the API, handle error cases, and test thoroughly.
Compliance and security requirements: If your app must handle PCI-DSS data (credit cards), SOC 2 compliance, or GDPR privacy rules, the development cost increases significantly. Audit logging, encryption, access controls—these aren't free.
Performance optimization: "Make it fast" isn't free. Database optimization, caching, CDN setup, code splitting—all cost time.
Training and handoff: If you're hiring the developer to build something for your team to maintain, time spent teaching your team how the system works is a hidden cost.
Minimum Viable Project Budgets
In Australia, don't expect a custom web application under $15,000–$20,000. That's the lower bound for a simple project. Here's why:
Discovery and scoping (5 days @ $150/hr): $6,000. Design (3 days): $3,600. Development of a basic CRUD app (10 days): $12,000. Testing and deployment (2 days): $2,400. Total: roughly $24,000 even for a "simple" project. At $100/hour, you're looking at 240 hours minimum.
Projects under $15,000 often skip proper discovery, design, and testing. You get a working MVP, but it's fragile and poorly documented. Once you need to maintain or enhance it, technical debt surfaces.
Comparing Pricing Models
| Model | When to Use | Cost | Risk On | Best For |
|---|---|---|---|---|
| Time & Materials | Unclear scope, evolving requirements | Variable, often $60k–$150k+ | Client | Discovery phase, prototypes, ongoing development |
| Fixed Price | Well-defined scope, stable requirements | Fixed, often $40k–$200k | Developer | Feature-complete projects, migrations |
| Retainer | Ongoing work, 10–40 hrs/week needed | Predictable monthly fee | Shared | Maintenance, feature development, support |
| Day Rate | Consulting, workshops, discovery | Predictable by engagement length | Shared | Short-term engagement, expert advice |
Negotiating Rates & Getting Fair Value
Rates are negotiable, but so is scope and timeline. If you push a developer to lower their rate, they'll reduce scope or extend the timeline. You can't have all three: low cost, fast delivery, and high quality. Choose two.
If a developer charges $200/hour but you only have a $30,000 budget, you have options: (1) reduce scope—build fewer features; (2) extend timeline—hire for 20 hours/week over 15 weeks instead of full-time; (3) hire a less experienced developer at $100/hour (trading quality for cost); (4) use a different pricing model like retainer.
Getting fair value means finding a developer whose rates align with your budget and whose quality matches your needs. The cheapest developer often isn't the best value—they may produce unmaintainable code or miss deadlines.