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Our cost change submission for 2026/27

Cost Change 2026 Update – 24 September 2026

In August 2026, Ofwat issued its draft determination for Cost Change 2026 submissions. United Utilities has submitted the following representations in response.

Documents
UUWR26-01R - UUW representation on 2026 cost change (PDF 636 KB opens in a new window)
UUWR26-02R Representation - Growth in Water Resources – Enabling data centre growth (PDF 717 KB opens in a new window)
UUWR26-04R Representation - Growth at Sewage Treatment Works – WwTW capacity for New Homes (PDF 2.1 MB opens in a new window)
UUWR26-06R Representation - AH business case – Enhance our Water Network Storage Assets (PDF 770 KB opens in a new window)
UUWR26-07R Representation - AH business case – Upgrade our Boreholes (PDF 544 KB opens in a new window)
UUWR26-09R Representation - Windermere gated programme (PDF 427 KB opens in a new window)
UUWR26-10 Cost change DD response tables (XLSX 519KB)
UUWR26-14R Evidence on AMP8 delivery (PDF 504 KB opens in a new window)
UUWR26-15R Cost change DD response - PCDs (XLSX 147 KB)

Growth Unlocked: Water for the New Economy

We have submitted our proposals for Growth and Asset Health investment to Ofwat’s 2026 Cost Change process.

Documents
Main document – UUW26-02 Growth Unlocked Water for the New Economy (PDF 2.3MB opens in a new window)
Letters of support (PDF 5.1MB opens in a new window)
Growth case – UUW26-03 Growth in Water Resources - Enabling data centre growth (PDF 1.1MB opens in a new window)
Growth case – UUW26-05 Growth in Water Resources - clean energy growth in Ellesmere Port (PDF 1.2MB opens in a new window)
Growth case – UUW26-07 Growth at Sewage Treatment Works- WwTW capacity for New Homes (PDF 1.4MB opens in a new window)
Asset Health case - UUW26-12 Asset Health Business Case - Protecting Rapid Gravity Filters (PDF 1.9MB opens in a new window)
Asset Health case – UUW26-13 Asset Health Business Case - Enhancing Water Network Storage Assets (PDF 3.1MB opens in a new window)
Asset Health case – UUW26-14 Asset Health Business Case - Upgrading Boreholes (PDF 2.5MB opens in a new window)
Asset Health case – UUW26-15 Asset health Business Case - Supporting Gravity Sewers (PDF 2.4MB opens in a new window)
Asset Heath case – UUW26-16 Asset Health Business Case - Protecting Trickling Filters (PDF 2.8MB opens in a new window)
Data Tables
UUW - Cost change data tables 1 (.xlsx 44KB opens in a new window)
UUW - Cost change PCD Tables 1 (.xlsx 699KB opens in a new window)
UUW - Cost change PCD Tables 2 (.xlsx 40KB opens in a new window)