To assess the feasibility of testing indoor commercial sex workers (CSW) for Chlamydia trachomatis and Neisseria gonorrhoeae in an outreach setting. All CSW seen on outreach over a 6-week period were offered self-taken vulval swabs for chlamydia and gonorrhoea testing. Feasibility was assessed by all the outreach workers on a standardised proforma. Of the 93 women offered the service, 40 accepted, of whom five (12%) had not previously accessed sexual health services. The majority of women declining the service had recently attended a sexual health clinic. Three cases of chlamydia and one of gonorrhoea were diagnosed. The cost per sexually transmitted infection (STI) was £392.50. Most of this group of women were knowledgeable about sexual health and were already having regular check-ups, but a significant minority did not know how to access STI care. Offering STI testing on outreach was feasible and cost effective.