Scottish Ministers have published new statutory directions requiring Scottish Water capacity to support future housing development. The directions were published on 23rd October 2026 and set water and sewerage priorities across Scotland for six years.
The Scottish Water (Objectives: 2027 to 2033) Directions 2026 have been made but do not come into force until 1st April 2027. They address strategic capacity, planning cooperation, ageing infrastructure, wastewater discharges and flood resilience.
I would pay particular attention to the relationship between a proposed development and the available water and sewerage network. A policy commitment to provide capacity does not mean that every housing site already has a funded, buildable connection.
Scottish Water capacity and the new housing duty
Paragraph 6 of the signed directions is unusually explicit. Scottish Water must, in the ministers’ words, “identify and provide new strategic capacity that will meet the demand of all new housing development”. The same paragraph covers domestic water requirements arising from commercial and industrial development.
This is a direction to Scotland’s publicly owned water company, not a fresh statutory duty on individual planning authorities or an automatic planning consent for developers. Its legal basis is sections 56 and 56A of the Water Industry (Scotland) Act 2002.
The directions also require Scottish Water to support National Planning Framework 4 while carrying out its role as a statutory consultee in the planning process. The framework remains a separate planning policy document.
Why Scottish Water capacity depends on existing networks
Ministers have not simply told Scottish Water to build new treatment works wherever growth is proposed. Paragraph 6 requires it to work with stakeholders to steer strategic development towards places with existing capacity and to explore ways of freeing capacity before major network upgrades are required.
There is a further safeguard against building unused infrastructure. New strategic capacity must support committed investment, minimising the risk that expensive plant and pipelines are built without the development needed to justify them.
For a housing promoter, that makes early engagement important. Available treatment capacity, the scale and timing of planned development, a reasonable route for connections and the need for off-site reinforcement are distinct questions. A favourable principle of development cannot answer all four.
The direction also applies a clear maintenance priority. Scottish Water must maximise the life of its current assets, with enhancement and maintenance taking precedence over building entirely new assets where the existing network can still perform reliably.
For Scottish Water capacity assessments, I would distinguish an established current network constraint from a forecast shortfall and from a planned improvement with a firm delivery programme. These are not interchangeable statements in a planning application or housing land assessment.
Who pays for extra connections and upgrades?
A separate ministerial statement on charging principles, also issued on 23rd October, explains the intended approach to costs during the 2027 to 2033 regulatory period.
Local infrastructure extensions and certain upgrades linked to individual development are covered by reasonable-cost arrangements up to the statutory limit. A developer can be responsible for costs above that limit. Enhancements benefiting wider development are treated differently, with infrastructure charges used to contribute towards relevant network costs.
Scottish Water is to meet the cost of upgrading strategic infrastructure under the published principles. That is significant, but it does not remove every developer contribution or mean that new water or sewerage connections are free.
Infrastructure charges are envisaged for each dwelling connected to water and sewerage services, with corresponding arrangements for domestic requirements within non-household development. The detailed charges will depend on the regulator’s determination and the applicable charging scheme.
Scottish Water capacity policy therefore needs to be read alongside the cost and programme of a particular connection. The directions give a national investment obligation; they do not certify that an individual developer has secured technical approval, a timetable or commercial terms.
For major housing schemes, the practical Scottish Water capacity question is not whether ministers support development in general. It is when the necessary network works can be completed, and how their cost is divided.
What changes in April 2027?
The new directions commence on 1st April 2027 and cover the period ending 31st March 2033. They revoke the previous objectives for 2021 to 2027. The Scottish Government’s business and regulatory impact assessment says the Water Industry Commission for Scotland expects to publish its final charging determination in November 2026.
That sequence matters. Publication in October 2026 is a genuine completed policy decision, but the new statutory objectives are not yet operative. Nor is the final regulated price determination already settled.
Wastewater, sewer overflows and rainwater
The directions go well beyond new homes. Scottish Water must publish, by 31st December 2027, a maintained list of its unsatisfactory intermittent discharges, giving locations, investment priorities and expected improvement dates, subject to the Scottish Environment Protection Agency’s approval.
They also require a refreshed Improving Urban Waters Routemap for the period from January 2028 to December 2033, agreed with the environmental regulator, together with annual progress reporting. Data on intermittent overflow events must be published as soon as reasonably practicable.
On rainwater, Scottish Water is directed to work with other bodies to promote integrated urban catchment management, including sustainable drainage, lower sewer flooding risk, reduced pollution and flood-resilient places.
These objectives could matter to the design of growth areas and infrastructure strategies. They are not, however, a blanket approval of any particular sustainable drainage scheme or a guarantee that a constrained catchment will be upgraded before the first dwellings are occupied.
A further requirement is a report to ministers by 31st March 2028 on options for closing Scotland’s forecast water supply and demand gap in 2050. It must consider water efficiency, demand management and possible additional supplies.
What Scottish developers should do now
At the outset of a Scottish housing scheme, seek current written network and treatment capacity information, understand where reinforcement might be needed and test whether the proposed phasing matches realistic infrastructure delivery.
Planning Geek’s overview of planning in Scotland is a useful starting point for the separate Scottish planning framework. A Scottish Water connection assessment does not replace the local development plan, National Planning Framework 4 or the necessary development management decisions.
When dealing with Scottish Water capacity for larger sites, I would record what has actually been committed, who has to pay for which works and what assumptions about other planned growth were used. Particular care is needed if different sites rely on the same constrained treatment plant or strategic pipework.
There is no new statutory requirement here for councils in England, Wales or Northern Ireland. These are Scottish ministers’ directions governing Scottish Water, with their own commencement date and statutory basis.
The practical significance is that housing growth now sits explicitly within the next regulatory period’s statutory objectives, alongside environmental performance and asset resilience. The test will be whether Scottish Water capacity is provided where development can realistically proceed, rather than remaining a high-level promise.
Official documents
Scottish Government: 2027 to 2033 statutory directions and the signed eight-page document; 2027 to 2033 charging principles; implementation and regulatory impact assessment.
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