The salary trajectory of a Process Engineer ranges between locations and employers. The salary starts at £35,821 per year (estimate) and goes up to £65,023 per year (estimate) for the highest level of seniority.
The estimated average salary for a Process Engineer at WSP is £126,949 per year or £61 per hour, but some professionals have reported earning up to roughly £199,406 per year (90th percentile). The typical pay range is between £100,971 (25th percentile) and £161,570 (75th percentile) annually. This is based on 14 salaries submitted by WSP Process Engineer professionals on Glassdoor, as of Jul 2026.