Designing Enterprise Information Architecture with SharePoint Hub Sites

What Is a Hub Site and Why Does It Matter?

SharePoint Hub Sites are an architectural construct that logically groups related sites under a single umbrella, providing shared navigation, branding, content aggregation, and search experiences. In traditional SharePoint architecture, sites were nested hierarchically through subsites. Modern SharePoint architecture positions every site as an independent top-level site collection, with hub sites serving as the logical connection point for these independent sites.

The fundamental motivation behind this architectural shift is flexibility. In the subsite model, changing a site's position in the hierarchy created serious operational overhead including broken URLs, permission inheritance issues, and mandatory data migration. In the hub site model, a site can be re-associated with a different hub through a dropdown menu—no data migration, URL changes, or permission reconfiguration required.

Core capabilities hub sites provide:

• Shared navigation: All sites associated with a hub share a consistent top navigation bar.
• Brand consistency: Theme, color palette, logo, and fonts are defined at the hub level and inherited by associated sites.
• Content aggregation (roll-up): News, events, and documents at the hub level are automatically aggregated from all associated sites and presented in a centralized view.
• Search scoping: Searches at the hub level cover only content from sites associated with that hub, improving the business relevance of search results.
• Security independence: Each site maintains its own permission structure; hub association does not create permission inheritance.

The strategic importance of hub sites stems from their ability to design the organization's digital workplace as a user-centered experience. A well-planned hub architecture ensures employees reach the information they need with minimal clicks.

Hub Site Architecture Fundamentals

The Hub-Spoke Model

The hub-spoke model forms the foundation of modern SharePoint information architecture. In this model, a central hub site (the hub) logically brings together associated sites (the spokes). The hub site is typically created as a Communication Site and represents a broad business area such as a department, function, or region. Spoke sites are team sites or communication sites connected to this hub.

For example, a "Human Resources" hub site might encompass the following spoke sites:

• HR Policies (Communication Site)
• Recruitment Portal (Communication Site)
• Employee Benefits (Communication Site)
• HR Operations (Team Site)
• Performance Management (Team Site)

The hub-spoke model's greatest strength is scalability. When a new project or business unit is created, adding a new spoke site to an existing hub takes seconds and does not affect the existing structure.

Multi-Tier Hub Structures

SharePoint Online supports a two-level hub hierarchy: parent hubs and child hubs. This structure enables large organizations to model complex information architectures.

Structural limits:

Parameter	Limit
Maximum child hubs under a parent hub	50
Maximum sites associable to any hub	2,000
Maximum hierarchy depth	2 levels

Multi-tier structures are particularly ideal for geographic or regional organizations. For example, a "European Operations" parent hub might contain "United Kingdom," "Germany," and "France" child hubs, each hosting their regional sites.

Theme inheritance: Child hubs automatically inherit the parent hub's theme. All sites associated with a child hub also inherit the child hub's theme. Site owners can override themes when necessary, but excessive overrides should be avoided to maintain brand consistency.

Enterprise Information Architecture Planning

Department-Based vs. Function-Based Approach

Two fundamental approaches exist for information architecture planning:

Department-based approach: Each department is represented as a hub site (HR, Finance, Marketing, IT, Legal, etc.). This approach mirrors the traditional organizational chart in the digital environment and is intuitive for users. However, representing cross-departmental projects can become challenging. Function-based approach: Hub sites are organized by business function (Project Management, Customer Relations, Product Development, etc.). This approach is more effective in matrix organizations but may be less intuitive for users initially. Hybrid approach (recommended): In most enterprise environments, the most effective strategy combines both approaches. Department hubs form the foundational structure while cross-functional hubs (e.g., "Digital Transformation" or "Sustainability") support inter-departmental collaboration.

Taxonomy and Metadata Design

Effective information architecture requires a robust taxonomy and metadata strategy. Metadata organizes documents by meaning rather than location, enabling users to discover content through search and filters instead of rigid folder hierarchies. This foundation is especially critical for enabling Copilot and AI agents to leverage enterprise knowledge effectively; our SharePoint enterprise knowledge activation guide provides a comprehensive roadmap for this journey.

Taxonomy design principles:

• Use the Managed Term Store. Create a controlled term set rather than relying on free-text tags. This ensures consistent classification and improves search accuracy.
• Define Content Types. Establish standardized document structures; for example, content types such as "Policy Document," "Project Plan," and "Meeting Notes" define consistent metadata fields for each document type.
• Design reusable site columns. Site columns can be defined at the hub level and inherited by associated sites, ensuring consistent metadata structure across the organization.
• Create hierarchical terms. Hierarchical term structures like "Region > Country > City" enable multi-dimensional filtering.

Recommended core metadata fields:

Metadata Field	Type	Purpose
Department	Managed Term	Which department the content belongs to
Content Type	Content Type	Document classification
Project Code	Text	Project-based filtering
Expiration Date	Date	Content lifecycle management
Target Audience	Person/Group	Who the content is intended for
Sensitivity Level	Choice	Sensitivity classification

Hub Site Creation and Configuration (Step by Step)

The hub site creation process begins by promoting an existing communication site to a hub. Creating a hub site from scratch is not possible; a site must first be created, then registered as a hub.

Step 1 – Create a communication site. Create a new Communication Site through the SharePoint Admin Center or the SharePoint start page. The name of the site to be used as a hub should clearly reflect its role in the organization's information architecture (e.g., "Human Resources," "Finance," "IT Services"). Step 2 – Register the site as a hub. From SharePoint Admin Center > Active Sites, select the relevant site and use the "Register as hub site" option from the "Hub" tab. Assign a name and description to the hub site. Step 3 – Configure hub navigation. Edit the hub site's top navigation bar to add links to associated sites. Navigation automatically appears across all sites connected to the hub. Step 4 – Apply a theme. Apply a theme aligned with corporate brand identity to the hub site. The theme will automatically be inherited by associated sites. Step 5 – Configure association permissions. Determine which users can associate sites with this hub. Restrict this permission to SharePoint administrators or specific site owners to prevent uncontrolled associations. Step 6 – Associate spoke sites with the hub. Navigate to each spoke site's settings, go to the "Hub site association" section, and select the relevant hub. Upon association, the site immediately inherits the hub's navigation and theme. Step 7 – Configure content aggregation web parts. Add web parts such as "News," "Events," and "Highlighted content" to the hub site to enable content aggregation from associated sites.

Navigation and Search Optimization

In an effective hub site architecture, navigation and search directly determine how quickly users can access information.

Navigation design principles:

• Use mega menus. Modern SharePoint supports mega menu format in hub navigation. Mega menus present numerous links in a categorized layout, enabling users to quickly find the site they need.
• Limit navigation depth. More than three levels of navigation depth negatively impacts user experience. Primary navigation should feature hubs, secondary navigation should include key spoke sites, and the third level should contain critical sub-pages.
• Apply audience targeting. Apply audience targeting to navigation items so users see only links relevant to them. For example, the "Manager Tools" link in the HR portal would be visible only to users in a management role.
• Use consistent navigation terminology. Apply the same terminology standard across all hubs; avoid using "Documents" in one hub and "Resources" in another for the same concept.

Search optimization:

• Configure managed properties. Map custom metadata fields to searchable and filterable managed properties.
• Create search verticals. Define customized search verticals at the hub level to enable users to quickly filter specific content types (Policies, Forms, News, etc.).
• Evaluate PnP Modern Search web parts. Beyond standard SharePoint search web parts, PnP Modern Search offers advanced filtering and visualization options.

Example Architectures

500-Person Organization

A mid-sized organization requires a simple, manageable hub structure. Multi-tier hub hierarchy is generally unnecessary.

Hub Site	Type	Spoke Sites	Content Scope
Intranet Home	Communication	—	Company news, announcements, links
Human Resources	Communication	HR Policies, Career Portal, Benefits	HR processes, forms, policies
IT Services	Communication	Help Desk, IT Policies, Training	IT support, guides, system docs
Finance	Communication	Budget Reports, Procurement	Financial reports, approval workflows
Projects	Communication	Project A (Team), Project B (Team), Project C (Team)	Project documents, timelines
Quality & Compliance	Communication	ISO Documents, Audit Reports	Standards, procedures, audits

Total site count: 15–25 sites, 6 hubs

In this structure, each hub hosts a maximum of 4–5 spoke sites. Navigation is simple and flat; users can reach target content within two clicks.

5,000+ Person Organization

Large-scale organizations require multi-tier hub hierarchy and regional structures.

Parent Hub	Child Hubs	Example Spoke Sites
Corporate Communications	—	News Center, Events, CEO Blog
Human Resources	Recruitment, Learning & Development, Employee Experience	HR Policies, Career Portal, LMS Integration, Survey Results
IT & Digital	Infrastructure, Application Development, Cybersecurity	Help Desk, DevOps Wiki, Security Policies, Change Management
Finance & Legal	Accounting, Internal Audit, Legal Affairs	Budget Portal, Audit Reports, Contract Management
Operations	Manufacturing, Logistics, Quality	Facility Management, Supply Chain, ISO Documents
Regions	United Kingdom, Europe, Middle East	Regional news, local HR, regional projects
Project Management	—	Strategic Projects, PMO Tools, Project Templates

Total site count: 80–150+ sites, 7 parent hubs, 15+ child hubs

In this structure, audience targeting is critically important. A manufacturing floor employee does not need to see detailed Finance hub navigation; navigation items are filtered based on user profile.

Common principles for both architectures:

• The intranet home page is positioned as an independent hub and provides links to all hubs.
• Viva Connections adds a personalized mobile and desktop experience layer on top of the hub architecture.
• Power Platform integration automates business processes through hub sites.

Governance and Maintenance Plan

The long-term success of hub site architecture depends on continuous governance and maintenance processes. Architecture without governance eventually faces uncontrolled growth, content pollution, and user experience degradation.

Governance framework:

Area	Policy	Frequency
Site creation	New site requests go through centralized approval	Ongoing
Hub association	Only authorized personnel can create hub associations	Ongoing
Content lifecycle	Inactive sites archived after 12 months	Quarterly review
Navigation updates	Verify hub navigation currency	Monthly
Theme compliance	Spoke sites meet brand standards	Quarterly
Metadata consistency	Term store and content types are current	Semi-annual
Access review	Site access lists align with business requirements	Quarterly
Ownership verification	Every site has an active owner confirmed	Monthly

Site lifecycle management:

Define a standard provisioning process for new sites. This process should require the following information:

• Site name and purpose
• Hub to associate with
• Site owner and backup owner
• Sensitivity label
• Expected lifespan (permanent or project-based)
• Target audience

Measurement and reporting:

• Monitor page views and visitor statistics at the hub level.
• Use search analytics to identify the most searched content and content that users cannot find.
• Use site usage reports to periodically identify inactive sites.

Hub site architecture, when correctly planned and continuously managed, can fundamentally transform an organization's information access experience. Our New SharePoint Experience guide will help you explore SharePoint's modern capabilities in greater depth. If you are planning a migration from on-premises to the cloud, our SharePoint Migration Checklist resource will also prove valuable.

In conclusion, hub site architecture is not a static structure but a living system that evolves with the organization. Successful architecture places user needs at the center, is designed for scalability, and is sustained through continuous governance.