The Water Industry Commission for Scotland has opened public consultation on a Draft Determination proposing near-£8bn of investment — a 30% jump on the current period. Here is what suppliers north of the border need to know, and when to start positioning.
While England's water companies wrestle with AMP8 delivery and Ofwat's own future, Scotland has quietly opened one of the most significant regulatory consultations of the year. The Water Industry Commission for Scotland (WICS) launched public consultation on 30 June 2026 on its Draft Determination for Scottish Water's next regulatory period — and the numbers are substantial.
WICS is proposing investment of approximately £7.9 billion, a 30% increase on the current period, while capping annual bill rises at CPI+2%. For a supply chain that has spent the last eighteen months focused almost entirely on AMP8 south of the border, this is a reminder that Scotland runs its own regulatory cycle — and it is about to open a substantial pipeline of its own.
The Draft Determination sets out Scottish Water's spending plans and customer charges for the next regulatory period, with the consultation running from 30 June to 1 September 2026. Alongside the headline £7.9 billion investment figure, WICS has identified around £360 million of potential spending reductions it believes Scottish Water could achieve through efficiency, and has set a leakage reduction target of 15% — equivalent to 67 million litres a day.
£7.9bn total proposed investment (up 30% on the current period) · CPI+2% maximum annual bill increase · £360m of identified potential efficiency savings · 15% leakage reduction target (67 million litres/day) · Final Determination due 29 October 2026 · New charges effective 1 April 2027.
Scotland's regulatory model differs from England and Wales in one important respect for suppliers: Scottish Water is a single, publicly-owned entity rather than a set of competing private companies, and WICS sets its determination through a different process to Ofwat's price reviews. But the practical effect for the supply chain is similar — a defined multi-year investment envelope, translated into frameworks, alliances and contract lots that suppliers need to be positioned for well before procurement opens.
Scottish Water's current c.£8bn investment programme already has key delivery partners in place, and their positions are worth understanding before the new period begins. Stantec and AECOM hold roles as primary designers, while a Mott MacDonald Bentley joint venture acts as asset delivery partner across the programme. These appointments give a strong signal of where Tier 1 relationships already sit — and where Tier 2 and specialist subcontractors should be building relationships now, ahead of the next wave of framework renewals that will likely follow the Final Determination in October.
Scottish Water has also demonstrated it can deliver at scale recently: the £235 million Ayrshire Glasgow Resilience Project, improving supply resilience for Greater Glasgow, Ayrshire and East Renfrewshire, completed this year. That kind of large-scale resilience investment — trunk mains, storage, treatment works upgrades — is exactly the type of work the new Draft Determination is designed to fund more of.
Three things stand out for suppliers considering whether to build a presence in the Scottish market, or expand an existing one.
A 15% leakage reduction target — 67 million litres a day — is a serious commitment, not a token gesture. That means sustained investment in network monitoring, active leak detection, pressure management and mains renewal across Scottish Water's network. Suppliers with acoustic logging, satellite/aerial leak detection, smart metering or trenchless mains replacement capability should treat this as a live signal, not a future possibility.
WICS identifying £360 million of potential spending reductions means Scottish Water will be under pressure to demonstrate value for money across its supply chain. Expect closer scrutiny of framework rates, more emphasis on collaborative and alliance-style delivery models, and continued appetite for digital tools that reduce whole-life cost — asset condition monitoring, predictive maintenance and off-site/modular construction methods are likely to be favoured where they can show a clear efficiency case.
With the Final Determination due 29 October 2026 and new charges starting 1 April 2027, Scottish Water's major delivery frameworks and alliances are likely to be reviewed, extended or re-let around that transition. Given Stantec, AECOM and Mott MacDonald Bentley's current positions, suppliers with existing relationships into those organisations — or into Scottish Water's civils, MEICA and process framework holders — have a natural route in. Suppliers without an existing Scottish presence should use the consultation period to start building visibility now, rather than waiting for procurement notices to appear in October.
Scottish Water's 30% investment uplift and CPI+2% bill cap sit against a backdrop of English water companies facing intense scrutiny over environmental performance and bill rises well above inflation. Suppliers weighing where to focus growth effort may find Scotland's more stable, publicly-owned regulatory relationship an attractive complement to a heavily AMP8-focused pipeline in England and Wales.
Water Industry Hub tracks regulatory decisions, framework awards and procurement pipeline notices across every UK water company — including Scottish Water and WICS. Get the Scottish market on your radar before the Final Determination lands.
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