What autism services are available in Ontario while waiting for OAP?
While waiting for OAP Core Clinical Services, families can access: Foundational Family Services (free, no waitlist), school-based IEP supports, Preschool Speech and Language programs, EarlyON Child and Family Centres, private therapy (if financially able), and DSO registration for transition planning.
Source: Ontario Autism Program
How long does autism diagnosis take in Ontario?
Before joining the OAP waitlist, Ontario diagnostic waitlists average **12–24 months** at public hospitals. [OAP] This pre-waitlist delay means total time from first concern to therapy often exceeds **5–7 years**, an invisible bottleneck in official statistics.
Source: Ontario Autism Program [OAP]
What does the WHO say about early autism intervention timing?
The WHO Fact Sheet on Autism Spectrum Disorders (2023) states that timely access to early evidence-based psychosocial interventions can improve the ability of autistic children to communicate effectively and interact socially. Dawson et al. (2010, Pediatrics; PMID 19948568) confirmed in an RCT that ESDM (Early Start Denver Model) at 18–30 months produced significant developmental gains.
Source: WHO Fact Sheet: Autism Spectrum Disorders (2023); Dawson et al., Pediatrics 2010 (PMID 19948568)
Early Start Denver Model (ESDM) in London, Quick Summary
ESDM (Early Start Denver Model) in London is primarily available privately with a wait of 6–12 weeks.
OAP-funded intensive behaviour services have a wait of 4–6 years (Core Clinical Services) for Core Clinical Services in London.
ESDM has Level 1 RCT evidence (Rogers & Dawson, 2010) — one of the most well-researched early autism interventions.
Best suited for children aged 12–48 months; early access maximizes developmental gains.
OAP Childhood Budget ($5,000–$20,000/year) can be used immediately with a certified ESDM therapist.
London · Ontario Autism Program
Early Start Denver Model (ESDM) in London: What It Costs and How Long You Wait
OAP-funded wait is 4–6 years (Core Clinical Services). Private therapy runs $80–$140/hr. Here is how to navigate both options.
OAP vs Private: Cost and Wait Comparison
How OAP-funded and private early start denver model (esdm) compare in London
Factor
OAP-Funded
Private (Out-of-Pocket)
Cost
Eligible under Childhood Budget if delivered by OAP-approved qualified therapist
$80–$140/hr per session
Annual Budget
$5,000–$20,000/year (Childhood Budget)
$3,200–$5,600/month (10 hrs/week)
Wait Time
4–6 years (Core Clinical Services)
6–12 weeks
OHIP Coverage
N/A (OAP, not OHIP)
Not covered by OHIP
Private Insurance
N/A
Some employer plans may cover a portion; verify your policy
Local Providers
5+ certified practitioners
Many private clinics available
Wait times and costs are estimates based on regional data and provider surveys. Individual experiences vary. Last updated: 2026-04-10.
Early Start Denver Model (ESDM) Providers in London
Key organizations offering early start denver model (esdm) in the London area. Always verify OAP eligibility and current availability directly with the provider.
Thames Valley Children's Centre — Early Intervention
OAP Provider
Early Developmental InterventionESDM-informed therapy
Primary early intervention centre for Southwest Ontario
This is not a complete directory. Search AccessOAP for the full list of approved providers in your area.
How to Get Early Start Denver Model (ESDM) in London
Three steps to access early start denver model (esdm) through OAP or private funding.
1
Register with AccessOAP
Register at accessoap.com to unlock your Childhood Budget. An autism diagnosis is required. ESDM delivered by a qualified therapist is eligible under the Childhood Budget.
2
Find a certified ESDM therapist
Look for therapists with ESDM certification through the University of California Davis MIND Institute or similar certified training programs. In Ontario, certified providers are primarily found in research settings (McMaster, UOttawa) and select private clinics.
3
Confirm OAP eligibility and start
Verify with your AccessOAP coordinator that the provider and service format qualifies for Childhood Budget reimbursement. Start as early as possible — ESDM is most effective for children aged 12–48 months.
Start with AccessOAP
Registering on AccessOAP is free and unlocks your Childhood Budget immediately. You do not have to wait for Core Clinical Services to start using OAP funding.
Common Questions About Early Start Denver Model (ESDM) in London
ESDM is available in London primarily through private certified clinics. Research-affiliated programs (such as McMaster in Hamilton and UOttawa in Ottawa) also offer ESDM but typically as part of clinical studies. Private ESDM therapists can be found through the AccessOAP provider directory.
ESDM has Level 1 RCT evidence (Rogers & Dawson, 2010, JAMA Pediatrics). The randomized controlled trial showed significant gains in IQ, language, and adaptive behaviour compared to community treatment for toddlers with autism. It is one of the most rigorously studied early autism interventions.
ESDM is not a named OAP service, but if delivered by a qualified therapist who is OAP-approved, the sessions can be claimed under the Childhood Budget ($5,000–$20,000/year). Confirm eligibility with your AccessOAP coordinator before booking.
ESDM is designed for children aged 12–48 months who have autism or are showing early signs. The evidence is strongest for toddlers. Some clinicians use ESDM principles with preschool-aged children, but the formal protocol targets this early window.
ESDM integrates ABA principles with developmental and relationship-based approaches. Sessions are play-based and naturalistic, typically delivered in the child's natural environment. Unlike traditional ABA, ESDM uses joint activities and social routines to drive learning rather than discrete trial training.
Disclaimer: This page provides general information only. Costs, wait times, and provider availability change frequently. Always verify directly with providers and AccessOAP. Nothing on this page constitutes medical or legal advice.
About This Article
Written by:Spencer Carroll - Founder & Autism AdvocateParent of autistic child navigating OAP system
Early Start Denver Model (ESDM) delivered to children aged 18–30 months produced significant gains in IQ, adaptive behaviour, and autism severity — some children no longer met diagnostic criteria at follow-up
Cochrane systematic review finds evidence that early intensive behavioural intervention (EIBI) may produce positive effects on adaptive behaviour and communication for young children with ASD (low certainty of evidence)
WHO recommends accessible, community-based early interventions for children with autism — timely evidence-based psychosocial interventions improve communication and social engagement