BT SD-WAN deployment timelines vary significantly depending on whether sites have existing BT circuits, the type of new connectivity being ordered and the complexity of the network design. A site with existing BT infrastructure can be live in 4 to 6 weeks. A new site requiring a leased line installation can take 12 weeks or more. Understanding the deployment phases and the lead times for each component is critical for setting realistic project timelines and avoiding delays.
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End-to-End Deployment Timeline
| Phase | Activities | Typical Duration |
|---|---|---|
| 1. Discovery and design | Site audit, circuit availability check, vendor selection, security policy design, QoS mapping, IP addressing plan | 1-3 weeks |
| 2. Commercial | Quote generation, contract negotiation, order placement | 1-2 weeks |
| 3. Circuit ordering | Order new underlay circuits from Openreach or BT Wholesale | 1-12 weeks (circuit dependent) |
| 4. Appliance staging | Configure SD-WAN templates, build overlay tunnels, lab testing, BT 100-point pre-deployment checklist | 1-2 weeks |
| 5. Pilot deployment | Install SD-WAN at 2-3 pilot sites, validate application performance, test failover | 2-3 weeks |
| 6. Rollout | Deploy remaining sites in waves. BT uses zero-touch provisioning to ship preconfigured appliances. | 2-8 weeks |
| 7. Hypercare | Post-deployment monitoring period. BT NOC and project team available for rapid issue resolution. | 2-4 weeks |
Circuit Lead Times
The underlay circuit order is almost always the longest lead time item in an SD-WAN project. These are the typical Openreach/BT provisioning timescales.
| Circuit Type | Standard Lead Time | With Excess Construction | Notes |
|---|---|---|---|
| BTnet leased line (EAD) | 60-90 working days | 90-120+ working days | Requires Openreach fibre build to premises. Longer if no existing duct. |
| FTTP | 10-20 working days | 20-40 working days | Dependent on Openreach FTTP coverage at the postcode. |
| SoGEA | 5-10 working days | 10-15 working days | Fastest fixed-line option. Available at most UK postcodes. |
| 4G/5G cellular | 1-5 working days | N/A | SIM provisioning and router delivery. No Openreach dependency. |
Zero-Touch Provisioning
Both Fortinet and Meraki support zero-touch provisioning (ZTP). This means BT can preconfigure the SD-WAN appliance in their staging lab and ship it directly to the site. On-site staff simply plug in the power and WAN cables. The appliance connects to the central controller automatically and downloads its full configuration.
- No specialist engineer required on site for the physical installation
- Reduces per-site installation time from hours to minutes
- Configuration changes can be pushed remotely after deployment
- Particularly effective for multi-site rollouts (50+ locations)
BT’s 100-Point Pre-Deployment Checklist
BT runs a standardised pre-deployment validation process before any SD-WAN appliance is shipped to a customer site. This includes:
- Circuit connectivity verification (primary and backup)
- Overlay tunnel establishment testing
- Firewall and security policy validation
- Application routing policy confirmation
- QoS policy testing (voice, video, business critical, best effort)
- Failover scenario testing (primary circuit failure simulation)
- DNS resolution testing (local breakout and centralised)
- Management portal access confirmation (FortiManager, Meraki Dashboard)
- SNMP and syslog integration testing
- Network emulation in BT lab environment before live deployment
Factors That Delay Deployment
| Delay Factor | Typical Impact | Mitigation |
|---|---|---|
| Leased line excess construction | +30-60 working days | Order circuits immediately after design sign-off. Consider FTTP as interim primary. |
| Landlord/wayleave approvals | +20-60 working days | Engage landlords before circuit ordering. Start wayleave process in parallel. |
| Security policy not defined | +2-4 weeks | Define firewall rules and application routing policies during the design phase. |
| IP addressing conflicts | +1-2 weeks | Complete IP audit and readdressing plan before rollout begins. |
| Site access restrictions | +1-4 weeks | Agree site access windows with facilities teams during project planning. |
Deployment Models by Site Count
| Deployment Size | Sites | Recommended Approach | Total Timeline |
|---|---|---|---|
| Small | 1-5 | Direct cutover. All sites in one wave. | 6-12 weeks |
| Medium | 6-20 | Pilot (2-3 sites) then 2-3 rollout waves. | 10-16 weeks |
| Large | 21-100 | Pilot then phased waves of 10-15 sites per week using ZTP. | 12-24 weeks |
| Enterprise | 100+ | Dedicated project team. Parallel workstreams for circuits, staging and deployment. | 16-40 weeks |
Accelerating Your Deployment
- Use FTTP or SoGEA at sites where leased line lead times would delay the project. Upgrade to a leased line later if needed.
- Deploy 4G/5G as an interim primary circuit while waiting for fixed-line orders to complete.
- Run circuit orders and design workstreams in parallel rather than sequentially.
- Use zero-touch provisioning for all branch sites to minimise on-site engineering time.
- Engage with landlords and building management early to avoid wayleave delays.
Existing BT Circuit Sites vs New Builds
Sites that already have a BT circuit (leased line, FTTP or SoGEA) can be deployed significantly faster because the underlay connectivity is already in place. Only the SD-WAN appliance and overlay configuration need to be added.
| Scenario | What Is Needed | Typical Timeline |
|---|---|---|
| Existing BT leased line | Ship appliance, configure overlay, cutover routing | 4-6 weeks |
| Existing FTTP/SoGEA | Ship appliance, configure overlay, may need static IP | 3-5 weeks |
| New leased line required | Openreach fibre build + appliance + overlay | 10-16 weeks |
| New FTTP required | Openreach FTTP install + appliance + overlay | 4-8 weeks |
| New SoGEA required | SoGEA provision + appliance + overlay | 3-6 weeks |
| 4G/5G only (temporary) | SIM activation + router delivery + overlay config | 1-2 weeks |
Post-Deployment: What Happens After Go-Live
- Hypercare period (2-4 weeks) — BT project team and NOC provide enhanced monitoring. Any issues escalated immediately with priority handling.
- Handover to BAU — Project team hands responsibility to BT’s ongoing managed service operation. Service reviews scheduled (quarterly for most contracts).
- First service review — Typically 30-60 days after go-live. Covers uptime, incident log, bandwidth utilisation and any optimisation recommendations.
- Ongoing monitoring — BT NOC monitors all circuits and appliances 24/7. Alerts trigger automated responses with engineer escalation for persistent failures.
