Question: I’m going to be hiring soon for a full-stack software engineer, contract to hire, in London - how/where would I find an avg. salary range? I have one I have budgeted for but need to double-check that it makes sense for the market.
Maybe you can say the number what you thought
The site https://levels.fyi has too employer pay. It's a bit lower in London. See what job ads are offering in the area.
Not sure what data is available for London, but there's lots of US-based data on sites like PayScale, Paysa, Glassdoor, etc.
I understand London salaries are a bit lower than US cities with equivalent cost of living, but a Full Stack Software Engineer in NYC, SF, Seattle, etc. would run you around $125k-175k, depending on experience. Normal for companies like Google/Amazon/Microsoft to pay $200k+. Since you said CTH, hourly rates would run about $125/hr, again DOE.
Yes I will suggest you the best ideas about salary range to hire a software developer you can see some guide here on the link above.
I would go search through glassdoor, or another comparable source, for local companies that are similar to your company who have positions similar to those which you would like to fill.