This study used a pre-experimental and post-experimental design to evaluate a TEACCH-based Early Intervention Programme. Thirty-one parents of 18 preschool children recently diagnosed with an Autistic Spectrum Disorder attended the eight-week programme delivered by trained facilitators. Parents completed pre-intervention and post-intervention measures, including the Parenting Stress Index. Programme facilitators assessed children pre-intervention and post-intervention using the Psycho-Educational Profile 3. Results indicate a statistically significant decrease in parental stress and increase in children's expressive and receptive language skills from pre-testing to post-testing. Parents reported a high level of satisfaction with the programme. This study is an example of a practice-based intervention aiming to deliver high-quality, evidenced-based care to children, young people and their families. (Contains 3 tables.)