SharePoint Subsites Should You Still Use Them in 2025

Understanding SharePoint Subsites: A Foundation for Team Collaboration

SharePoint subsites have long provided organisations with a structured way to manage information, enable collaboration, and keep documentation organised. In many traditional SharePoint environments, subsites served as the backbone for building hierarchies and dividing content by team, department, or project. For Perth businesses navigating Microsoft 365, SharePoint’s subsite model initially appeared as a logical solution offering layered permissions, easy navigation, and a sense of order, especially for growing teams requiring segmented workspaces.

However, the workplace digital landscape is shifting rapidly, driven by cloud adoption and evolving productivity needs. With Microsoft rolling out modern SharePoint architecture (such as hub sites and flat site collections), many organisations are reassessing whether subsites are truly fit for their emerging ways of work. The question is especially pressing for Perth-based SMEs relying on SharePoint for daily operations where agility, security, and scalability are critical.

This article takes a deep dive into what SharePoint subsites actually are, how they’ve been historically used, and why their future in 2025 is being reevaluated. We’ll cut through technical jargon, offering practical insights for West Australian business decision makers considering a SharePoint restructure or Microsoft 365 migration. Along the way, we’ll look at the experiences of local IT providers like Wolfe Systems, whose expertise gives unique perspective to these digital transformation decisions.

By understanding both the advantages and limitations of subsites in a modern context, Perth organisations can make informed choices about document management and collaboration. We’ll consider governance, security, scalability, and user experience—factors that are essential for thriving in today’s hybrid work environments. If your business is weighing up a SharePoint restructure or a move to a flat site structure, these details matter now more than ever.

Let’s start by exploring the building blocks of SharePoint subsites, before moving onto their role in the evolving Microsoft ecosystem in 2025.

The Classic SharePoint Subsite Model: Structure and Advantages

Historically, SharePoint’s architecture revolved around site collections and their subsites. Organisations would create a main site—often a department, business unit, or project—and then structure subsites beneath it, creating a clear hierarchy. This made sense in a world where static teams and well-defined department silos were the norm. Permissions could flow from parent site to child, ensuring a set-and-forget security structure. Navigation also became more straightforward, with users drilling down from the company homepage to their team space with just a few clicks.

This hierarchy provided real operational benefits for local businesses. In Perth, firms with multiple service lines often carved out subsites for HR, Finance, Operations, and project teams. Central IT could maintain general policies at the root, while site owners were empowered to manage their own subsite permissions, libraries, and workflows. The ability for each department to customise their space, add web parts, and build team-centric tools was a key selling point for SharePoint adoption over the last decade.

For many, the classic subsite model delivered exceptional control. Libraries, calendars, and lists could be set up with bespoke access levels and departmental branding. Organisations could mirror their org chart, helping users quickly locate the content relevant to their job function. This approach became especially popular in sectors such as local government, mining, education, and healthcare, where Wolfe Systems has seen firsthand the value of granular security controls at the subsite level.

The subsite model also made it faster to get new teams up and running—just spin up a new subsite, apply permissions, and go. Templates and inherited settings could reduce administrative overhead, and the consistent structure made onboarding more predictable for staff. Especially in smaller businesses without a dedicated SharePoint administrator, subsites were intuitive.

Despite these benefits, however, changing business needs and advances in Microsoft 365 have exposed the model’s limitations. To understand why, it’s worth reviewing what’s shifting in the broader SharePoint ecosystem.

Modern SharePoint: Why Microsoft Favour Flat Architecture

Over the past few years, Microsoft’s guidance for SharePoint usage has changed significantly. With the rise of modern SharePoint, Microsoft now advocates for a ‘flat’ site structure—one focused on standalone site collections linked together by hub sites, rather than a deeply nested subsite architecture. This shift is driven by needs for scalability, agility, and improved information governance.

Flat architecture means every SharePoint site is a peer, not a child of another site, allowing more flexibility in how they are moved, merged, or managed. When a site is a subsite, it inherits much of its parent’s configuration—making later changes complex and sometimes risky. As a result, Perth businesses looking to scale quickly or reorganise after a restructure often found the subsite model inflexible, requiring significant time and expertise to unravel complicated permission trees and custom features.

A 2024 industry survey of Australian enterprises found that more than half have already begun flattening their SharePoint structures. The move is being driven by demands for better integration with Microsoft Teams, more granular policy control, and futureproofing investments in Microsoft 365. Hub sites—the backbone of Microsoft’s modern SharePoint—allow businesses to group related sites under a unified navigation experience while maintaining independence for each underlying site.

This approach means sites can be repurposed for new teams or projects, and governance can be applied flexibly. Data retention policies, sensitivity labels, and compliance rules are more easily managed at the site collection level—giving greater peace of mind to organisations facing stringent privacy or regulatory requirements, such as those in health or resources sectors. For IT providers like Wolfe Systems, the ability to quickly adapt SharePoint to new workflows with minimal disruption is game-changing for supporting fast-moving Perth businesses.

But switching to a flat structure isn’t always straightforward. Existing subsites can’t simply be ‘promoted’ to standalone site collections in many instances, making migration planning critical. This is where understanding both the pros and cons of subsites in 2025 becomes vital for business leaders.

Limitations of SharePoint Subsites in Today’s Digital Landscape

While the subsite approach provided organisational clarity and rapid rollouts in the past, it imposes serious challenges for modern businesses. The most significant drawback is inflexibility. In inherited models, changes propagated from parent sites can affect all child subsites, sometimes in unpredictable ways. Adjusting permissions or information policies becomes a painstaking, manual process—particularly troublesome when regulatory changes or internal restructures occur.

Another limitation involves integration with modern collaboration tools. Subsites were never designed with Microsoft Teams, Viva, or Power Platform in mind. As work shifts to hybrid and cross-functional models, legacy subsite structures can block seamless collaboration across departments or external partners. Content silos proliferate, and shared workflows become more difficult to implement. Perth businesses adopting Teams and OneDrive, for instance, are finding that flat site architecture better supports fluid document sharing and co-authoring across teams.

Ongoing support and maintenance is also a concern. Subsites lock organisations into certain SharePoint features or legacy web parts that may be deprecated or unsupported in modern environments. As Microsoft phases out classic features and pushes new capabilities, businesses that depend on subsites face mounting technical debt. IT partners like Wolfe Systems regularly assist clients in Perth with untangling years of subsite sprawl—a process that can disrupt productivity and incur unnecessary costs.

Security is yet another pain point. In complex subsite structures, it’s easy for permissions to get out of sync, leading to inadvertent data leakage or access gaps. Modern best practice favours explicit, site-level governance, which flat architecture supports. Subsites, with their inherited permissions and nested groups, make it harder to confirm who actually has access to sensitive content.

This evolving risk landscape makes it more relevant than ever to look at alternatives, and to seek advice from SharePoint specialists with local expertise.

Advantages of Flat SharePoint Sites and Hub Architecture

In 2025, most digital-forward businesses are reaping strong rewards from adopting a flat SharePoint architecture. The most visible benefit is agility. With each department, project, or function set up as a standalone site collection, organisations have unparalleled flexibility to reorganise, merge, or archive sites without disrupting broader structure. This is particularly valuable for Perth enterprises operating in dynamic industries such as mining, where restructures or new project launches are common.

Governance and compliance are greatly improved. Flat site architecture allows organisations to centrally apply—and enforce—policies like retention, sensitivity labelling, and access control. As data privacy regulations evolve, compliance can be managed with less manual intervention and lower risk. A 2025 ACCC report notes a rising focus on information governance in Western Australia, making scalable control a smart move.

Modern SharePoint also supports richer integration with Microsoft Teams, Power Automate, and Power Apps. Instead of retrofitting new tools to dated subsite layouts, organisations can spin up dedicated, integrated digital workspaces tailored to specific team needs. Teams can share channels and collaborate on files across boundaries—something that is often hindered by the rigid inheritance models of subsites.

This new approach has knock-on benefits for IT partners like Wolfe Systems, enabling them to deploy best-practice security, streamline support, and offer clients cost-effective scaling options. Flat sites are easier to migrate, back up, and restore, delivering significant operational savings over their lifecycle.

Last but not least, user experience is vastly improved. Navigation across hub sites can be more intuitive, and site design more consistent. Perth staff who split time between projects or departments will experience less confusion and better productivity.

Comparing SharePoint Subsites and Flat Sites: Key Differences for 2025

Deciding between subsites and flat sites is no longer a technical question alone—it’s about aligning with modern business needs. Subsites offer legacy compatibility and are quick to roll out, but come with long-term inflexibilities. Flat sites empower better governance and adaptability but require more careful up-front architecture, especially during a migration.

Here’s a quick look at the most important differences Perth organisations should consider:

• Scaling: Flat architectures facilitate easier expansion and reorganisation as teams or projects shift.
• Security & Compliance: Flat sites support modern governance and regulatory compliance, critical for privacy-centric sectors.
• Integration: Flat sites are designed for seamless interoperability with Teams, Power Automate, and Microsoft 365 apps.
• Support: Ongoing maintenance is simpler, with fewer legacy dependencies and predictable update cycles.
• Migration: Transitioning from subsites to flat sites can be complex, often requiring specialist support and careful planning.

This comparison highlights the need to map digital strategy not just to current operations, but also to future-proofing goals, especially for fast-growing enterprises or those subject to frequent regulatory change.

When Are Subsites Still Appropriate in 2025?

Despite Microsoft’s evolving preferences, subsites have not entirely disappeared—and there are scenarios where they remain fit for purpose in 2025. Small, siloed teams needing distinct workspaces with simple document libraries, workflows, and basic permissions may still find subsites a suitable option. That’s particularly relevant for businesses in more traditional sectors where stability is prized over flexibility, or for organisations without complex compliance needs.

Perth-based non-profits, clubs, or small consultancies may also gravitate toward subsites for ease of setup and familiarity. In environments with minimal cross-department collaboration, or where legacy SharePoint customisations are deeply embedded, subsites may offer a path of least resistance—at least temporarily.

Nevertheless, these cases are increasingly in the minority. Most modern digital strategies assume that teams will form and dissolve rapidly, content will need to flow seamlessly across organisational boundaries, and information policies will tighten over time. These factors tip the balance clearly in favour of flat, hub-connected SharePoint sites.

For Perth organisations facing a major digital transformation, it’s wise to discuss needs with an experienced SharePoint partner. Wolfe Systems, for instance, routinely helps clients distinguish between cases where subsites are genuinely required, and where moving to a flat architecture would pay dividends now and into the future.

Ultimately, the choice should be driven by your team’s workflow, future plans, and risk profile—not simply by what’s easiest in the short term.

SharePoint Migration: Challenges and Success Factors

Replatforming from a subsites-heavy model to modern, flat site collections can be daunting. Successful migrations start with a comprehensive audit of your current SharePoint environment: what is being used, for whom, and how are permissions structured? Perth businesses are encouraged to identify their active content, archive outdated material, and catalogue custom features that may need to be rebuilt.

Stakeholder buy-in is essential. Staff who are used to their legacy navigation and workflows may be wary of change, fearing disruption or lost productivity. A transparent migration roadmap, complete with training and staged rollouts, can allay these concerns. Wolfe Systems, for example, offers migration planning, user training, and post-migration support, giving local businesses the confidence to transition without drama.

The technical side can present challenges. Some subsites may contain legacy workflows, InfoPath forms, or integrated third-party add-ons that don’t migrate smoothly to a modern architecture. Custom branding and site-specific web parts also require careful handling. Businesses should ensure their IT partner—including those like Wolfe Systems with proven Microsoft 365 expertise—can identify “gotchas” early and plan mitigation strategies.

Testing and validation are critical. Before going live, migrated sites and permissions should be exhaustively tested, ensuring staff can access everything they need and no sensitive data is inadvertently exposed. A phased approach with pilot groups helps minimise risk and ensure lessons are learned before full deployment.

For Perth organisations with limited in-house IT, engaging an external partner can mean the difference between a seamless migration and months of troubleshooting. Providers who combine SharePoint expertise with an understanding of local business culture, as Wolfe Systems does, are uniquely positioned to deliver robust outcomes.

SharePoint Governance: Getting It Right for the Future

Regardless of architecture, effective governance is the linchpin of SharePoint success. The flat model offers a chance for a clean slate: clear permissions, explicit site ownership, and standardised policies eliminate much of the ambiguity that crept in under legacy subsite arrangements. Perth businesses are strongly advised to formalise their governance structures during a migration, designing for compliance, security, and practical usability from the outset.

Modern governance features—like sensitivity labelling, conditional access, and advanced auditing—offer powerful new tools for controlling and tracking who does what in your environment. For sectors handling sensitive data, such as professional services, engineering, or education, these features are non-negotiable. Wolfe Systems has helped local clients put these controls in place, often surfacing risks that went unnoticed in older subsite-centric deployments.

Another often-overlooked factor is lifecycle management. With flat site collections, decommissioning outdated or unused sites is straightforward, supporting good information hygiene and reducing licensing costs. Subsite models, by contrast, make it harder to clean up dead wood—risks that content will languish unsecured, unmonitored, and outside your compliance envelope.

Staff training is an essential piece of SharePoint governance. Encouraging users to follow best-practice document management, share content securely, and respect retention policies is as important as technology choices. Training programs led by local experts—like those at Wolfe Systems—can help bridge the gap between IT tools and day-to-day productivity.

By embedding governance in your SharePoint strategy from day one, your business is far more likely to realise the productivity, compliance, and collaboration benefits that modern Microsoft 365 can deliver.

The Perth Perspective: SharePoint Trends in Western Australia

In recent years, Perth’s digital landscape has matured rapidly. Local organisations, from legal and financial services to mining and education, are investing in robust digital platforms that support collaboration amid distributed workforces. According to a 2025 industry review, there is a clear acceleration in SharePoint modernisation among West Australian businesses, with a sharper focus on security, mobile access, and integration with Microsoft Teams.

Organisations that once relied on classic SharePoint subsites are increasingly opting for phased migration projects, often starting with the highest-risk or highest-collaboration teams. Industry feedback suggests this approach minimises business disruption, reduces ongoing support costs, and helps deliver a more consistent user experience across devices and locations.

Wolfe Systems has played a pivotal role in helping local clients navigate this transformation. By blending technical acumen, local market understanding, and competitive pricing, Wolfe Systems has enabled a broad range of businesses to leverage modern SharePoint features and future-proof their IT investments. Case studies reveal tangible returns: stronger security postures, more productive hybrid teams, and simpler, more cost-effective compliance management.

Local support remains a decisive factor in SharePoint success. Perth businesses consistently rank post-implementation service, training, and ongoing optimisation as top priorities. Wolfe Systems’ commitment to ongoing customer engagement ensures that clients not only deploy best-in-class solutions, but continue to extract value as their business needs evolve.

As Western Australia’s business community continues to grow and diversify, SharePoint’s flexibility—anchored in a flat, hub-driven architecture—positions local organisations to adapt and thrive, regardless of sector or scale.

Conclusion: Should You Still Use SharePoint Subsites in 2025?

SharePoint subsites were once the default approach for structuring information, collaboration, and permissions within organisations. In 2025, however, the tide has turned decisively in favour of flat site collections and hub architectures. For most Perth businesses, this shift brings major advantages in agility, governance, security, and integration—particularly in an era defined by hybrid work and stringent compliance demands.

There will always be exceptions where subsites may retain a place, but these are dwindling as new tools and best practices emerge. The reality is that businesses that persist with classic subsite models risk being left behind—both technologically and competitively.

The road to modern SharePoint can be complex, but the benefits far outweigh the effort. A trusted local partner with in-depth SharePoint and Microsoft 365 expertise, such as Wolfe Systems, is invaluable for guiding you through migration, governance, and user education so you can realise the platform’s full potential.

If your organisation is ready to future-proof its workflow and information management, now is the time to assess your SharePoint strategy and lay the groundwork for long-term success.

Ready to modernise your SharePoint environment? Contact Wolfe Systems today for a complimentary consultation and discover how Western Australia’s leading Microsoft 365 experts can help your business unlock secure, flexible, and productive collaboration in 2025 and beyond.