The typical permanent placement fee for recruiting HVAC Engineers in the UK usually falls between 15% to 25% of the annual salary. For a vacancy with a salary of £48,000, this would translate to a fee ranging from £7,200 to £12,000. However, the exact percentage may vary depending on the specific recruitment agency, the level of expertise required, and the urgency of the placement. It’s always a good idea to discuss and negotiate fees directly with recruiters to ensure transparency and fairness.