BT SD-WAN Cost Factors for UK Multi-Site Businesses

BT SD-WAN is quoted per deployment. The commercial scope of every quote is shaped by site count, connectivity mix, vendor and licence selection, resilience requirements, management model and contract term. This page explains each factor so you can define your requirements before requesting a quote.

At a glance

Best for UK businesses with 2–200+ sites evaluating managed SD-WAN through BT Typical buyer IT managers, procurement leads or network architects scoping a WAN transformation Primary cost drivers Site count, underlay circuit type, SD-WAN vendor and licence tier, resilience design, management model, contract term Why scope varies BT SD-WAN is configured per deployment — site mix, bandwidth, security requirements and geographic spread all shape the commercial structure Next step Build your requirements using the BT SD-WAN pricing calculator →

Cost driver framework The main variables that shape BT SD-WAN commercial scope What affects cost most Two-column view of complexity and commercial scope indicators Underlay and circuit choices How BTnet, FTTP and cellular change complexity and resilience Vendor and licence options Platform choices and how licence tier affects security scope Management model Fully managed vs co-managed and the operational trade-off Contract term impact How commitment length affects monthly commercial structure Resilience and backup Backup circuit options and their impact on per-site scope Scenario cards Three example estate profiles showing lower, medium and higher complexity Buyer guidance Decision logic, procurement checklist, watch-outs and FAQs Open the pricing calculator → Define your sites, connectivity and vendor choice

Cost driver framework

The variables behind every BT SD-WAN quote

Every BT SD-WAN quote is assembled from a set of interlocking variables. Changing one often affects others. The matrix below identifies each primary cost driver, explains why it matters, and describes how complexity shifts between simpler and more demanding deployments.

Factor	Why it matters	Lower complexity	Higher complexity
Number of sites	Per-site hardware, licensing and connectivity scope scales with every additional location	Fewer than 10 UK sites with uniform requirements	50+ sites across mixed types and geographies
Underlay circuit type	Leased lines (BTnet) carry higher monthly commitments than broadband or cellular, but deliver SLA-backed performance	Majority broadband/FTTP with limited leased line	All sites on BTnet leased lines at higher bandwidths
Bandwidth tier	Higher bandwidth at each site increases the circuit scope per location	Standard broadband per branch	High-bandwidth leased lines per site
SD-WAN vendor	Different vendors carry different licensing structures and hardware requirements	Single vendor across all sites	Mixed vendor requirements or niche platform selection
Licence tier	Advanced security and SASE licences broaden the per-site scope compared to standard SD-WAN	Standard SD-WAN with basic firewall	Full SASE stack — ZTNA, CASB, SWG, sandboxing
Resilience design	Adding backup circuits at each site increases the per-location scope	Primary circuit only with no backup	Dual circuits with diverse physical entry at critical sites
Management model	Fully managed service carries broader operational scope than co-managed	Co-managed — internal team handles day-to-day policy	Fully managed with 24/7 NOC and BT-led incident response
Contract term	Longer commitments typically improve the monthly commercial structure; shorter terms carry a premium	36- or 60-month term	12-month pilot or rolling contract
Hub / DC connections	Connecting to centralised hubs or data centres adds design and circuit scope	No hubs — direct internet breakout only	2+ data centres requiring dedicated connectivity
Migration complexity	Phased migration from an existing MPLS or legacy WAN adds project and delivery scope	Greenfield deployment to new sites	Parallel running with existing MPLS during cutover

What affects cost most

Complexity and scope indicators

Increases commercial scope

More sites, particularly with mixed requirements
BTnet leased lines at higher bandwidths
Advanced or SASE-tier licensing
Backup circuits at every site
Fully managed with 24/7 NOC
Short contract terms (12 months)
Hub or data centre connectivity
Migration from existing MPLS or legacy WAN
International sites outside the UK

Reduces complexity or improves commercial fit

Uniform site requirements with consistent bandwidth
Standard SD-WAN licensing with no SASE requirement
FTTP broadband rather than leased lines
Cellular backup rather than leased line backup
Co-managed model with internal team capacity
Longer contract terms (36 or 60 months)
UK-only deployment
Greenfield rollout with no legacy WAN
Single vendor selection across all sites

Underlay and circuit choices

The physical connectivity at each site

The underlay — the physical connectivity at each site — is typically the single largest variable in a BT SD-WAN deployment. BT offers multiple circuit types, each with different performance, SLA and commercial characteristics.

Circuit type	Bandwidth range	Typical use case	Relative scope
BTnet leased line	100 Mbps – 10 Gbps	Primary circuit for business-critical or high-traffic sites	Highest — distance-dependent from BT PoP
FTTP fibre broadband	100 Mbps – 900 Mbps	Primary or backup circuit where SLA-backed performance is not essential	Moderate
EE cellular (4G/5G)	Variable — location-dependent	Backup/failover, temporary sites, or locations with no fixed-line access	Lowest per-circuit scope
Ethernet (EAD/EBD)	10 Mbps – 10 Gbps	Data centre connections, hub sites, or high-capacity links	High — depends on bandwidth and distance

Note: Leased line commercial scope is distance-dependent. Two sites with identical bandwidth requirements can have materially different monthly structures based on distance from the nearest BT Point of Presence. For leased line factors, see the BT leased line cost calculator.

Vendor and licence options

SD-WAN platform and security tier choices

BT delivers managed SD-WAN across multiple vendor platforms. The Network Union pricing calculator focuses on the two most commonly deployed for UK multi-site businesses: Fortinet and Cisco Meraki. The vendor and licence tier you select directly affects both the licensing scope and the security capabilities included.

Fortinet licence tiers

Tier	Included capabilities	Typical fit
Standard	NGFW, SD-WAN, application-aware routing, VPN, basic threat protection	Businesses needing SD-WAN with standard firewall capabilities
Advanced	All Standard features plus FortiSASE, ZTNA, CASB, SWG, sandboxing	Organisations requiring full SASE and zero trust security

Cisco Meraki licence tiers

Tier	Included capabilities	Typical fit
Enterprise	SD-WAN, cloud management dashboard, application visibility, auto VPN	Standard SD-WAN with cloud management
Advanced Security	Enterprise features plus Layer 7 firewall, AMP, intrusion prevention, content filtering	Businesses requiring integrated branch security
Secure SD-WAN Plus	Advanced Security plus Cisco Umbrella SIG (SWG, CASB, DLP, DNS-layer security)	Full SASE deployment with cloud-delivered security

Additional BT SD-WAN platforms: BT also delivers managed SD-WAN on Cisco vManage, VMware VeloCloud and Palo Alto Prisma platforms. These are typically deployed for larger or more complex enterprise requirements. Vendor availability and packaging should be confirmed during the quote process.

Management model

Fully managed vs co-managed

The management model determines the split of operational responsibility between BT and your internal team. This choice directly affects the breadth of managed service scope.

Model	BT handles	Customer handles	Scope implication
Fully managed	Design, deployment, monitoring, firmware updates, policy changes, 24/7 NOC, incident response	Dashboard visibility, service reviews, requirement changes via BT	Broader managed service scope — reflects BT’s full operational responsibility
Co-managed	Platform maintenance, security updates, capacity monitoring, infrastructure issues	Policy modifications, app prioritisation, day-to-day changes, user troubleshooting	Narrower managed service scope — requires internal network team capacity

Decision logic: Choose fully managed if your organisation lacks a dedicated network operations team, needs 24/7 incident response, or wants BT to own all policy changes. Choose co-managed if you have an internal team capable of handling day-to-day SD-WAN policy changes and want to retain operational control.

Contract term impact

How commitment length shapes commercial structure

BT SD-WAN contracts are available in 12, 24, 36 and 60-month terms. Longer commitments typically improve the monthly commercial structure.

12 mo

Pilot / proof of concept

Premium monthly structure

24 mo

Short-term commitment

Moderate monthly structure

36 mo

Standard commitment

Improved monthly structure

60 mo

Long-term commitment

Most favourable monthly structure

Watch-out: Shorter terms give flexibility but carry a premium. If you are testing SD-WAN before a wider rollout, a 12-month pilot on a small number of sites can validate the solution before committing to a longer term across the full estate.

Resilience and backup

Backup circuits and their scope impact

Adding backup circuits increases scope per site. The type of backup and the coverage model both matter.

Backup circuit options (from narrowest to broadest scope impact)

Broadband backup

Narrowest scope — secondary path at lower commitment

Cellular (4G/5G) backup

Rapid failover, no physical installation required

Leased line backup

Maximum resilience, broadest additional scope

Coverage options: All sites, leased line sites only, broadband sites only, or custom selection.

Diverse physical entry — requiring separate physical entry points for primary and backup circuits — adds further design complexity. This is typically relevant only for business-critical sites where a single point of physical failure is unacceptable.

Scenario cards

Three example estate profiles

These scenarios illustrate how different estate profiles create lower, medium and higher complexity deployments. They are for guidance only — your deployment will be quoted based on your specific requirements.

Lower complexity

Scenario A: 10-site UK retail estate

Sites10 retail branches across the UK Primary underlayFTTP broadband (100 Mbps per site) BackupCellular at all sites Vendor / licenceMeraki Enterprise ManagementCo-managed Contract36 months HubsNone — direct internet breakout

Scope characteristics: Broadband-based underlay keeps circuit scope narrow. Cellular backup avoids the lead time and scope of physical secondary circuits. Co-managed model reduces service scope. Standard Meraki licensing with no SASE requirement.

Medium complexity

Scenario B: 40-site mixed office and warehouse estate

Sites25 offices (leased line), 15 warehouses (FTTP broadband) Primary underlayMixed — BTnet 200 Mbps (offices), FTTP 100 Mbps (warehouses) BackupCellular at offices, none at warehouses Vendor / licenceFortinet Standard ManagementFully managed Contract36 months Hubs1 data centre hub

Scope characteristics: The split between leased line and broadband sites creates a two-tier commercial structure. Leased line scope at each office is distance-dependent. The data centre hub adds connectivity scope. Fully managed model broadens the service scope but removes internal operational overhead.

Higher complexity

Scenario C: 100-site multi-region business

Sites100 across the UK — offices, branches and remote locations Primary underlayBTnet 500 Mbps (head offices), FTTP 300 Mbps (branches), cellular (remote/temporary) BackupLeased line backup at head offices, cellular at branches Vendor / licenceFortinet Advanced (FortiSASE, ZTNA, CASB) ManagementFully managed with 24/7 NOC Contract60 months Hubs2+ data centres MigrationPhased migration from existing MPLS

Scope characteristics: High site count with mixed requirements across three underlay types. Advanced SASE licensing broadens per-site scope. Leased line backup at head offices adds a second circuit at critical locations. MPLS migration requires parallel running, extending delivery scope. 60-month term helps offset the broader monthly structure through long-term commitment.

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Use the pricing calculator to define your sites, connectivity, vendor choice and management model. Your requirements are reviewed by a BT Sales Specialist team through The Network Union’s partner channel.

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Buyer guidance

Is BT managed SD-WAN the right fit?

Likely a strong fit if

✓ You have multiple UK sites that need connecting
✓ You are replacing or supplementing MPLS or legacy WAN
✓ You need integrated security at the branch
✓ You want a single provider for underlay, overlay and management
✓ You need SLA-backed connectivity at some or all sites
✓ You use cloud and SaaS applications that benefit from application-aware routing

Consider alternatives if

— You have a single site with no WAN requirement
— Your needs are entirely broadband-based with no SLA requirement
— You have no requirement for centralised network policy management
— You already operate SD-WAN infrastructure and only need underlay circuits

Implementation variables that affect delivery

Leased line lead times — new BTnet circuits require provisioning time that should be factored into the project plan

Site surveys — required for leased line installations and may affect provisioning timelines

Wayleave agreements — third-party permissions for cable routing can extend timelines

MPLS migration phasing — parallel running periods add project duration and may incur dual-running scope

Security policy design — SASE deployments require upfront policy planning

Cloud integration — connecting to AWS, Azure or Google Cloud adds design and testing scope

Procurement checklist

Before requesting a BT SD-WAN quote, having these inputs defined will produce a more accurate initial indication.

☐ Total number of sites

☐ Site types (office, branch, warehouse, retail, DC)

☐ Preferred circuit type per site

☐ Bandwidth requirements per site type

☐ Backup circuit requirements

☐ Diverse physical entry requirements

☐ SD-WAN vendor preference

☐ Licence tier (standard or SASE)

☐ Management model preference

☐ Preferred contract term

☐ Hub or data centre connections

☐ Greenfield or MPLS migration

☐ UK-only or international sites

☐ Integration needs (Cloud Voice, AWS/Azure/GCP)

Watch-outs

Leased line scope is distance-dependent. Two sites on the same bandwidth can have materially different circuit structures based on distance from the nearest BT PoP. Always request site-specific indications.

SASE licensing broadens per-site scope. Moving from standard SD-WAN to SASE tiers adds cloud security services. Evaluate whether you need SASE at every site or only at specific locations.

Leased line lead times. New BTnet circuits require provisioning time. Broadband and cellular circuits provision significantly faster. Factor this into your project timeline.

Dual-running during migration. Migrating from MPLS involves a parallel running period where both networks are active. Budget for this overlap period.

Contract auto-renewal terms vary. Check renewal and exit terms before committing, particularly on longer agreements. Understand the notice period required.

Frequently asked questions

What is the main thing that affects BT SD-WAN commercial scope?

There is no single dominant factor. Commercial scope is shaped by the combination of site count, underlay circuit type, bandwidth, vendor and licence tier, resilience design, management model and contract term. Changing any one variable changes the overall structure.

Can I mix circuit types across my sites?

Yes. BT SD-WAN supports mixed underlay environments — leased lines at business-critical sites, broadband at standard branches and cellular at temporary or remote locations, all within the same SD-WAN overlay.

Do longer contracts improve the commercial structure?

Longer terms typically improve the monthly structure. However, the right term depends on your planning horizon and appetite for commitment. A 12-month pilot may be appropriate before a longer-term rollout.

What is the difference between standard and advanced licensing?

Standard licensing provides core SD-WAN: application-aware routing, VPN and basic firewall. Advanced or SASE-tier licensing adds cloud-delivered security — ZTNA, CASB, SWG and, for Fortinet, FortiSASE with sandboxing. Buyers should confirm which capabilities they require during scoping.

Is the service through Network Union different from going to BT directly?

All services are contracted directly with BT. The Network Union operates as a BT Authorised Partner, which means your quote is produced by BT’s sales specialist team with partner channel commercial terms applied.

How does SD-WAN compare to MPLS on commercial scope?

SD-WAN is generally positioned as a more commercially efficient alternative to MPLS, particularly when combined with broadband or FTTP underlay. The actual comparison depends on the specific deployment: a like-for-like replacement using leased lines with full SASE may not reduce scope significantly, while broadband-based SD-WAN with standard licensing often produces a meaningful change.

Can BT SD-WAN support cloud and SaaS applications?

Yes. BT’s managed SD-WAN supports direct connectivity to AWS, Microsoft Azure and Google Cloud, along with local internet breakout for SaaS applications. Buyers should confirm specific cloud integration requirements during the design phase.

What happens if a circuit fails?

SD-WAN’s dynamic path selection automatically reroutes traffic through available backup connections. If you have backup circuits configured, failover is automatic. BT’s NOC monitors all circuits and triggers escalation for persistent failures.

Request a BT SD-WAN quote

Use the BT SD-WAN pricing calculator to build a structured requirements summary. It covers site count, connectivity mix, vendor preference, resilience design and management model. Your requirements are reviewed by a BT Sales Specialist team through The Network Union’s partner channel, with the latest partner commercial terms applied. All services are contracted directly with BT.

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The Network Union has operated as an Authorised Partner of BT since 2012.