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Contractor Information

The Axe Brue, Parrett, and North Somerset Levels Internal Drainage Boards — which collectively operate as the Somerset Drainage Boards Consortium — maintain a list of Pre-Approved Providers, known as the Approved Supplier List (ASL). This list includes a wide range of specialist contractors and suppliers, and is used for projects ranging from £500 to £1,000,000 in value.

Contractors awarded annual channel cleaning contracts should refer to section 5.2 of the contract prior to submitting invoices.

Somerset Drainage Boards Consortium - river scene in Somerset

AC12 Price Increase of Costs

No inflationary increase is payable in the first year of the contract. If there is an increase of more than 2% in the Annual Consumer Price Index (CPI) from the contract start date to the 1st May in the second or third year of the contract period, the Contractor shall be entitled to claim that additional percentage on the price payable for the year in question. For the avoidance of doubt the Board will publish the official CPI figures on the Board’s website. Only fixed price work is eligible for CPI payments in years two and three of the contract. Works undertaken on an hourly basis will be paid for at the current hourly rates submitted by the Contractor.

Contract Year
Increase
February 22 tender
Year 5
22.65%
May 22 tender
Year 5
18.35%
Year 4
8.92%
Year 3
6.43%
Year 2
2.81%
Year 1
0%
Figures updated 25 June 2026

Approved Supplier List

The purpose of the ASL is to streamline our procurement process. Providers on the list are recognised as having met our minimum standards and requirements, which saves time and reduces duplication for both the Boards and the Providers.

However, please note, we will still request quotations or conduct tender processes to ensure best value.

The ASL is valid for a three-year period, with annual checks to ensure that key documents (such as health and safety policies and insurance certificates) are up to date. New providers can be added to the ASL at any time, and providers can opt out at any time by giving an appropriate notice period.

Any Contractors wishing to be included on the ASL, should contact the drainage board direct for an initial consultation prior to furthering an application.