--- title: "Darlington Building Society Backs SaaS for Core Banking: Balancing Modernisation with Member Value" description: UK building societies adopt SaaS and cloud banking to meet operational resilience rules, balancing regulatory compliance with improved member value author: Darie Nani (Editor-in-Chief) date: 2025-07-01T14:32:08.000Z updated: 2026-03-31T11:25:46.211Z canonical: https://www.sovereignmagazine.com/article/darlington-building-society-backs-saas-for-core-banking-balancing-modernisation-with-member-value image: https://cdn.nanimediahouse.com/az9mp5waee.jpg categories: Finance content_type: News region: United Kingdom publication: Sovereign Magazine --- UK building societies face an unprecedented deadline crunch this year. From 31 March 2025, every mutual must comply with stringent operational resilience rules that demand they can operate within impact tolerances for all important business services. The pressure is forcing traditionally cautious institutions to rethink their technology strategies – and some are choosing surprisingly bold moves. Darlington Building Society has just upgraded to a Software-as-a-Service version of SBS Banking Platform Core MSS, marking a significant shift for an institution that previously relied on more conventional technology approaches. The decision shows growing confidence in [cloud-based solutions](https://www.sovereignmagazine.com/article/how-nab-s-cloud-revolution-could-transform-australian-trading-technology) among UK mutuals, even as they balance modernisation with their commitment to member value. ## Meeting Regulatory Demands Through Technology ‘This project was about strengthening the foundations to further improve our member experience, our service resilience and continue the strong growth of Darlington Building Society,’ said Jonathan Harwood, Chief Technology Officer at Darlington Building Society. The timing aligns with regulatory expectations that have changed from guidance into hard requirements. The FCA and PRA’s operational resilience rules, which came into force in March 2022, give firms until this March to demonstrate they can [perform mapping and testing](https://www.fca.org.uk/publications/policy-statements/ps21-3-building-operational-resilience) to remain within impact tolerances. Building societies, with their smaller IT budgets and risk-averse cultures, have found this particularly challenging. Modern SaaS platforms offer mutuals a way to meet these requirements without the massive capital expenditure typically associated with core banking upgrades. Research suggests that [94% of UK financial institutions](https://saascada.com/insights/77-of-uk-bank-innovation-leaders-say-challenging-the-status-quo-can-put-careers-at-risk-finds-saascada/) have migrated or are migrating core banking infrastructure to the cloud, driven partly by regulatory pressure and partly by competitive necessity. ## Why Mutuals Are Finally Embracing Change Building societies have historically favoured incremental technology changes over wholesale system replacements. The sector’s mutual structure, with members rather than shareholders, creates different incentives around risk and investment. Recent Bank of England guidance suggests regulators understand this tension. ‘[Successful IT upgrades are crucial](https://www.bankofengland.co.uk/speech/2025/may/mutual-momentum-advances-in-building-society-regulation-speech-by-charlotte-gerken) for improving operational resilience, customer service and cost reduction in UK building societies and mutuals,’ noted Charlotte Gerken of the Bank of England in May. She emphasised that while IT change carries risk, it has become essential for sustainable growth. Member expectations are changing too. [Digital banking evolution](https://www.sovereignmagazine.com/article/what-is-the-next-phase-of-digital-banking) has accelerated across the sector. Coventry Building Society launched a new member app last year as part of their ‘Digital first, human always’ strategy, whilst Nationwide Building Society is running a major Technology Development Programme focused on data platforms and analytics. These initiatives show how mutuals are trying to close the [digital user experience gap](https://www.bsa.org.uk/media-centre/bsa-blog/may-2024/building-societies-conference-round-up-day-two/data-driven-evolution-transforming-building-societies-in-the-digital-era) with high street banks. ### Long-term Partnership Approach Darlington’s choice of SBS shows another trend among mutuals – working with established technology partners rather than shopping around for the cheapest option. The society has maintained a relationship with SBS over several years, suggesting confidence in the provider’s understanding of mutual sector requirements. ‘It is an honour to have supported Darlington Building Society through their cloud migration journey. We look forward to supporting them with future system integration opportunities and helping the society to find new ways to deliver an exceptional member experience,’ said Jonathan Davis, General Manager, UK Lending at SBS. This partnership model addresses one of the key challenges mutuals face in technology upgrades – finding providers who understand their regulatory environment and member-focused culture. Unlike traditional banks, building societies must balance commercial efficiency with their social mission of serving local communities. ## Operational Benefits and Member Value The SaaS upgrade promises to streamline Darlington’s day-to-day activities and workflows whilst introducing batch automation capabilities. This efficiency gain could prove crucial as building societies face continuing pressure on margins and competition from specialist lenders. More importantly for a mutual, the technology changes are designed to free up staff time for value-adding activities that support members and the local community. [Tech adoption strategies](https://www.sovereignmagazine.com/article/british-businesses-seek-productivity-surge-as-tech-adoption-strategies-gather-pace) increasingly focus on enhancing rather than replacing the human elements that differentiate mutuals from mainstream banks. [Core banking system migrations](https://www.grantthornton.co.uk/insights/key-challenges-facing-uk-building-societies/) typically cost several million to tens of millions of pounds and take 12 to 36 months to complete. The SaaS model potentially reduces both cost and risk by eliminating the need for extensive infrastructure investment and providing proven, regularly updated security measures. ## Industry-Wide Changes Darlington’s move comes as UK mutuals increasingly modernise their technology. The Building Societies Association has highlighted the critical role of data-driven evolution and [digital finance changes](https://www.sovereignmagazine.com/article/non-financial-companies-are-becoming-the-future-of-finance) for remaining competitive, noting increased industry efforts to upgrade digital services. The regulatory deadline of 31 March 2025 has created a natural forcing function for decisions that many mutuals had been postponing. Institutions that successfully navigate this upgrade cycle will likely find themselves better positioned for future regulatory requirements and member service expectations. The challenge now will be demonstrating that these technology investments deliver measurable improvements in member service and operational resilience – the twin goals that justify the expense for member-owned institutions. Early indicators from Darlington and other modernising mutuals will provide valuable guidance for the many building societies still weighing their options as the March deadline approaches.