The development cost directly depends on the range of required services. It can be a website template or a unique design development according to WordPress standards.
Approximate development costs by process:
1) Basic WordPress setup with template installation: about $400 (depends on the specific template).
2) Functional development: from $150/ medium complexity plugin development.
3) WordPress template development based on a mockup / layout: about $900.
4) Website design development from scratch: from $1800.
In total, the total website development comes from $400 to $2200.
Also, the website development can be extended by related services: content filling, texts translations, SEO research, interactive and other visual effects.