WordPress powers over 40% of the web. Its plugin ecosystem is both its greatest strength and its most common source of pain. Here's how I think about build vs. buy.
The Plugin Stack Problem
Four plugins stitched together, each with its own DB tables, admin UI, and update cycle. One updates, others break. Fragile, slow, expensive to maintain. At this point, a single custom plugin wins.
Signs You Need Custom Development
3+ plugins for one workflow. Slow site from plugin bloat. Constant update conflicts. No existing plugin does what you need. Significant licensing fees for partial solutions.
Signs You Don't
A well-maintained plugin solves your exact case. Requirements are standard. No budget for long-term custom maintenance. Needs might change significantly in 6 months.
The Cost Comparison
3 premium plugins ($100-200/yr each) + 10 hrs/month fixing conflicts = $5,000-8,000/year for a subpar solution. Custom plugin: $5,000-15,000 once, runs faster, minimal maintenance. Over two years, custom wins.